INDEX

INDEX

Chapter No.DescriptionPage No.

1. General Architecture of Digital Switching System

1-3

2. Functional Architecture of OCB 283 switch

4-8

3. Hardware architecture of OCB-283 Switching Systems

9-12

4. Main control station SMC

13-33

5. Switching multiprocessor station (SMX)

34-49

6. Auxilary Multiprocessor Station (SMA)

50-55

7. Trunk multiprocessors station (SMT)

56-72

8. Maintenance multiprocessor (SMM)

73-85

9. Synchronisation and time base station (STS)

86-118

10. Locavar Defence119-141

11. Arrangement of Power Plant 142-154

12. Environment requirements of ocb-283 system

155-164

OCB 283

OVER VIEW OF OCB 283

DIGITAL SPC SWITCHING SYSTEM

Digital Electronic SPC Switching Concept

1. Introduction :

All new technology switching systems are based on Stored Programme Control concept. The call processing programmes are distributed over different control organs of the system and are stored in ROM/RAM of the units. Data required to handle the calls are also managed in the RAMs of different control units. Processor in the control units by using the programme and data stored in unit ROM/RAM process and handle calls. Handling or processing a call means to ultimately establish a connection in a switch between I/C and O/G ends. Depending on the system the name and architecture of control units and switch may change but basic criterion for switching remains more or less the same.

2.0 OVERVIEW OF OCB 283 DIGITAL ELECTRONIC SYSTE M

2.1 Introduction :

OCB-283 is digital switching system which supports a variety of communication needs like basic telephony, ISDN, internet to mobile communication, data communication etc. This system has been developed by ALCATEL of Finance and therefore has many similarities to its predecessor E-10 B (also shown as OCB 181 in France).

The first OCB-283 exchanges of R 11 version were commissioned in Brest (Frame and Beijing (china) in 1991. The first OCB-283 exchange came to India in 1993. Subsequently, the system has been upgraded and current version R-20 was fully validated in January 1994. The exchanges which are being supplied to India belong to R-20 version. AT present, R21 and R22 versions are also being supplied. The basic architecture remaining same, more facilities both to subscribers and administration are supported by later versions.

2.2Salient Features of the system.

(i) It is a digital switching system with single T stage Switch. A maximum of 2048 PCMs can be connected.

(ii) It supports both analogue and digital subscribers.

(iii) The system supports all the existing singalling systems, like decadic, MF (R2), CAS and also CCITT#7 signalling system.

(iv) It provides telephony, ISDN, Data communication, cellular radio and other value added services.

(v) The system has automatic recovery feature. When a serious fault occurs in a control unit, it gives a message to SMM (O & M Unit). The SMM puts this unit out of service, loads the software of this unit in a back up unit and brings it into service. Diagnostic programmes are run on the faulty unit and the diagnostics is printed on a terminal.

(vi) OCB-283 has a double remoting facility. Subscribers access unit CSND can be placed at a remote place and connected to the main exchange through PCM links. Further, line concentrators can also be placed at a remote location and connected to the CSNL or CSND through PCMs. This special feature can meet entire range of necessities viz. urban, semi-urban and rural.

(vii) Various units of OCB-283 system are connected over token rings (IEE 802.5 standard). This enables fast exchange of information and avoids complicated links and wiring between various units.

(viii) The charge accounts of subscribers are automatically saved in the disc, once in a day. This avoids loss of revenue in case of total power supply/battery failure.

(ix) The traffic handling capacity of the system is huge. It can handle 8,00,000 BHCA and 25,000 erlangs of traffic. Depending on the traffic, a maximum of 2,00,000 subscriber or 60,000 circuits (or trade off between these two) can be connected.

(x) The exchange can be managed either locally or from an NMC through 64 Kb/S link.

(xi) All the control units are implemented on the same type of hardware. This is called a station. Depending on the requirement of processing capacity, software of either one or several control units can be located on the same station. For all these control units, only one backup station is provided, enabling automatic recovery in case of fault.

(xii) The OCB-283 system is made up of only 35 types of cards. This excludes the cards required for CSN . Because of this, the number of spare cards to be kept for maintenance, are drastically reduced.

(xiii) The system has modular structure. The expansion can be very easily carried out by adding necessary hardware and software.

(xiv) The SMMs (O&M Units) are duplicated with one active and other hot standby. In case of faults, switch over takes place automatically. Moreover, as discs are connected to both SMMS. there is no necessity of changing cables from one system to another.

(xv) The hard disc is very small in size, compact and maintenance free. It has a very huge memory capacity of 1.3 Giga bytes. The detail billing data are regularly saved in the disc itself, from were they can be transferred to mag tape for processing

(xvi) The space requirement is very small. No separate room is required for OMC.

(xvii) There is no fixed or rigid rack and suite configuration in the system. It provided great flexibility and adjustment in the available space.

(xviii) The environment requirements of the system are very flexible. False floor and ceiling are not essential. Air conditioning requirements are also not stringent. The system can work at temperatures 5 to 45o C, though the optimum temperature is 22 o C.

2.2 SUBSCRIBER FACILITIES PROVIDED BY OCB 283

OCB 283 provides a large number of subscriber facilities. Some facilities are available to only digital subscribers and as such they can not be availed by analogue subscribers. To avail these facilities subscriber number are given special categories by man machine commands.

Facilities to analogue subscribers:

(i) A line can be made only out going or incoming.

(ii) Immediate hot line facility The subscriber is connected to another predetermined subscriber on lifting the handset without dialing any number.

(iii) Delayed hot line facility When subscriber lifts the handset. Dial Tone is provided he can dial any number. If he does not dial a number, within a predetermined time, he is connected to predetermined number.

(iv) Aviated dialing The subscriber can record a short code and its correspondence full number in the memory. Later to dial this number, he has to only dial short code.

(v) Call forwarding When activating

to the number mentioned by the incoming calls to the subscriber gets transferred especially very useful for the people who are activating the facility. The facility is

(vi) Conference between 4 subscribers The subscriber

conversation, can include two more more subscribers by pressing B while in dialing their number

(vii) Call waiting indication When a subscriber is engaged in conversation and an incoming call, an indication is given in the form of a tone. Hearing this, the subscriber has option, either to hold the subscriber in conversation and attend the waiting call or to disconnect this subscriber and attend to the waiting call. In the former case, he can revert back to the earlier subscriber.

(viii) Automatic call back on busy If this facility is activated and if the called subscriber is found busy, the calling subscriber simply replaces the receiver. The system keeps watch on the called subscriber and when it becomes free, a ring is given to both the subscribers. On lifting they can talk to each other.

(ix) Priority line Calls from this line are processed and put through even when the number of free channels are within a threshould or when the system is operating in a catastrophic mode.

(x) Malicious call identification When this category is given to a subscriber, the number of calling subscriber (to this number) is printed on the terminal.

(xi) 12 to 16 kHz meter pulses The system can send 12 or 16 kHz meter pulses on the subscriber line for the operation of the home meter.

(xii) Battery reversal The system extends battery reversal when called subscriber answers. This is useful in case of CCBs.

(xiii) Detailed billing The system provides detailed bills giving details of date, time metered units etc.

(xiv) Absent subscriber service When activated, the incoming calls are diverted to absent subscriber service for suitable instructions or information.

FACILITIES TO DIGITAL SUBSCRIBERS

Digital subscriber are provided all the facilities available to analogue subscribers. In addition, they are provided following facilities which are called ISDN services. An ISDN subscriber can use many electronic devices on its telephone line and can utilise them for 2 or more simultaneous calls of either.

VOICE

DATA

VIDEO

The ISDN or Digital Subscriber of OCB-283 can be provided the following types of connections.

2 B + D Line :- 2 Voice Channels of 64 kbps & 1 Data channel for 16 kbps

30 B + D Line :- 30 voice channels of 64 kbps & 1 Data channel of 64 kbps

ISDN SUBSCRIBERS

The following is the list of some of the service to Digital subscribers

(a) It provides 64 Kb/s digital connectivity between two subscribers for data communication.

(b) The system can provide Group 2, 3 or 4 Facsimile (FAX) services.

(c) It provides videotext services.

(d) The system provides display of calling subscriber number on called subscribers telephone.

(e) The system also provides the facility for restriction of the display of calling subscriber number on called subscribers terminal. To avail this facility, the subscriber has to be given a category.

(f) The system provides the facility of displaying connected number on the calling subscribers terminal. This is especially useful when called subscriber has activated call transfer facility. The calling subscriber can choose to speak on forwarded number or disconnect the call.

(g) The above facility can be restricted byu giving special category to the subscriber.

(h) Charging advice The system is capable of providing charging advice either in real time or at the end of the call.

(i) User to user signalling The system permits transfer to mini messages between calling and called subscribers during call set up and ringing phase.

(j) Terminal portability during the call A subscriber (calling subscriber as well as called subscriber) can unplug terminal, carry it to some other place or room and resume the call within 3 minutes.

(k) Listing unanswered calls - The number of calling subscribers, who calls during the absence of called subscriber, are recorded in called subscribers terminal. The called subscriber can then check up these numbers and call them back if, he so wish.

GENERAL P ERFORMANCE DATA OF OCB-283

-------------------------------------

PROCESSING CAPACITY 220 CA/S OR 800, 000 BHCA

ERLANGE TRAFFIC 25, 000

MAX. SUBSCRIBER 200,000

MAX. CIRCUITS 60, 000

MAX. LR (PCMS) 2048

OCB-283 OR ALCATEL 1000 E-10 CAN WORK WITH ALL TYPE OF NETWORK

The E-10 (OCB-283) consists mainly of:

control stations.

software machines,

a communication local area network

This architecture also has other units including the STS (synchronization and time base station) which provides the timing signals for processing digital data.

Figure 5. shows the architecture of the E-10 (OCB-283) and the systems interfaces.

The Alcatel 1000 E-10 (OCB-283) in the telecommunication Network

The E-10 B (OCB-283) can be used for all switching applications:

local exchange.

regional or national transit exchange.

international transit exchange.

intelligent network service switching point.

mobile service switching point.

The E-10 (OCB-283) can also provide the STP (signallinmg transfer point) function of the N0 7 signalling network.

OCB 283

Installation

OCB EXCHANGE

INSTALLATION PROCEDURESThe installation procedures of the OCB-283 system are easier in comparison to its predecessor E-10 B system. Therefore, the installation time required is also less. The installation of the exchange equipments can be done.

With false floor or

Without false floor

depending on the specific site requirement. (This should be planned in advance and order should be palced accordingly as some additional installation material are essential for installation without false floor) The different racks are supplied with the cards plugged inside and inter rack cables are provided readymade except few cables. Therefore one should be careful while opening the racks packing and also their shifting to the site.

Prerequisites :- Following points should be checked before starting the actual physical installation.

1. Preparation & readyness of room & site.

(a) Civil works completed a per plan

(b) False flooring provided. In case of without false floor whether antisatic flooring is provided, if so its proper terminations to earth.

(c) Air-conditioning is available

2. All the tools are available.

3. All the material as per equipment list are received.

4. Availability of power plant and earth should also be ensured.

5. All cable trays for subscriber, PCM & Power cables & alarm cables are fitted.

DIMENSIONS FOR OCB 283 EXCHANGE

Rack Size in:2200 Hz 950 Wx 690 D

(mm)

No of Rows (Suits) in a Switch Room:Not Fixed

No of Racks per suite:Not Fixed

but for practical convenience may be limited upto:16

Inter suite Gap:Min. 800 mm to 1000

mm

:Max :- Variable

Clearance from Sidewalls:1500 mm

Height of Ceiling Minimum:3000 mm

Approximate floor area for a 6k exchange:44 sq m

Sequence of lay out of racks in suites:No special sequence or restriction (other than specific to site) except for

CA & DBM racks to be installed together preferably in middle of Suites of exchange. XA Racks to be installed in continuity & in Identical location s in two suites for the branches A & B.

O C B 2 8 3 R A C K S - F r o n t V i e w

(

LAYOUT OF ROOM :- Layout of the exchange is one of the foremost documents to refer. It gives the positions of various racks & equipments & devices.

LAY OUT OF AN OCB-283

SWITCHING ROOM

EXAMPLE :- BOMBAY SION TELEPHONE EXCHANGE

900

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Installation

BBUNIT APPLICATION COMPLETED

RUN CSNL TASK T5

Carry out sheets T1-1 to 3 in parallel to CONFORMATY

Carry out sheets T2-1 in parallel to switch on power

Carry out sheets T3-2 to 3 in parallel to the START UP STATIONS

(B) TEST PHASE WITH DEFINITIVE OFFICE LIBRARY : BBUMES

HARDWARE PROGRAMMING

Hardware programming is done on all the stations of OCB-283 except CSNs for the purpose of making the PHYSICAL ADDRESS of the MULTIPROCESSORS STATION on the communication multiplexes. HARDWARE PROGRAMMING is done on the TWO DIP switches on the Back plane of each shelf of the stations of OCB-283 as follows:

DEFINITIONS OF SWITCH POINTS :

APSE : (STATIONS PHYSICAL ADDRES SON MULTIPLEX) :It is indicated by DIP SWITCH2s switches from 4 to 8 (5 MSBs) & DIP SWITCH1s switches 1 to 4 (4 LSBs) = 8 bit field. The value of these switches in binary indicates the physical address of the station. The various stations can have the following APSMs.

APSM = 1STS, = 2 SMMA = SMMB

APSM = 4 TO 63 SMCAPSM = 64 TO 95 SMX (COM switches)

AMSM = 96 TO 223 SMA APSM = 224 TO 479 SMTs

TYOR : (TYPE OF UNITS)Type of units is indicated by switches 1 to 3 of DIP SWITCH 2.

TYOR = 0 -> SMM A,SMMB, SMTB

TYOR = 1 -> SMTA TYOR = 2 SMC or SMA

TYOR = 3 SMX TYOR = 7 Handler

DCOP : (COUPLER FIELD)

Coupler field DCOP is switch nos. 6 to 8 DIP SWITCH 1. It indicate the communication multiplex.

DCOP = 0 MISDCOP = 1 MAS 0

DCOP = 2 MAS 1 DOCP = 3 MAS 2

DCOP = 4 MAS 3DCOP = 5 CCS#7 Link

TYCP : (COUPLER TYPE)

TYCP is a single switch no5 of DIP Switch.:

TYCP = 0 SECONDARY COUPLERTYCP = 1 MAIN COUPLER

OCB 283

Documentation

The following is the list standard OCB-283 documents supplied alongwith exchange equipments. They contain

(A) The specific documents for site specific data & layouts and Cabling charts.

(B) General documents common to all sites. (eg. Commands, Operator sheets etc.)

Sl.

No.TOM-VOL-FILE

NO.TITLE OF DOCUMENTPURPOSE

1.1-1-1LIST OF DOCUMENTS (B)INDEX

2.1-1-2GUID TO SYSTEM DOCUMENTATION

(B)SYSTEM ARCH.

SYSTEM COMMISSIONING

TERMS, ABBR., GLOSSORY, IDENTIFICATION

3.2-1-1OPERATION & MAINTENANCE

(B)INTRODUCTION TO O&M SYSTEM & TELEPHONE USERS O&M SHEETS

4.2-2-1PREVENTIVE MAINTENANCE

(B)SYSTEM ACTIVATION TOTAL SYSTEM FAILURE

SMM O&M

5.2-3-1SUBSCRIBER LINE MANAGEMENTSUBSCRIBER LINE MANAGEMENT

6.2-4-1ALARMS AND MALFUNCTIONSALARMS

7.2-4-2MALFUNCTION REPORT MESSAGE

(B)DICTIONARY OF MALFUNCTION

REPORT

8.2-4-3RTOS DICTIONARY OF MALFUNCTIONS

(B)

9.2-5-1RTOS DICTIONARY OF MALFUNCTIONS

(B)DICTIONARY OF MNEMONICS AND SYMBOLS

10.2-5-2OPERATOR SHEET A TO F

(B)O&M COMMANDS SHEETS FOR OPERATIOR FROM

A TO F

11.2-5-3OPERATOR SHEET G TO 0O&M COMMANDS SHEETS FOR OPERATOR FROM

G TO 0

12.2-5-4OPERATOR SHEET P TO UO&M COMMANDS SHEETS FOR OPERATOR FROM

P TO U

13.2-6-1SYSTEM OPERATINMG AND MAINTENANCE MANUAL

(B)O&M

14.2-7-1RTOS MNEMONIC DICTIONARY

(B)RTOS OPERATOR SHEETS MACRO COMMANDS

15.2-9-1PERIODIC TASKS

(B)DESCRIPTION OF PERPIODIC TASKS

16.3-1-1SPECIFIC DOCUMENT

(A)INSTALLATION DOCUMENT

17.3-1-2OPERATING DTA REDA

(A)INSTALLATION DOCUMENT

18.3-1-3ACCEPTAN CE TESTING PROCEDURES

(A)A/T PROCEDURES

19.3-1-4INSTALLATION DOCUMENT

(A)INSTALLATION

20.3-1-5EQUIPMENT LOG

(A)TECHNICAL STATUS

21.8-1-1SOFTWARE DOCUMENTATIONS

(B)SOFTWARE

22.8-1-2FILES OF TR, TX ETC.

(B)SOFTWARE

23.8-1-3OM & CSN FILESSOFTWARE

24.10-1-1INSTALLATION DOCUMENT

(A)HARDWARE DETAILS

25.10-1-5INSTALLATION DOCUMETHARDARE DETAILS

26.10-1-6COMMISSIONINBG DOCUMENT

(A)GUIDE TO COMMISSIONING]

GUIMES

27.10-1-7COMMISSIONINBG DOCUMENT

(A)GUIDE TO COMMISSIONING]

GUIMES

28.10-1-8COMMISSIONINBG DOCUMENT

(A)GUIDE TO COMMISSIONING]

GUIMES

THE DOCUMENTS TO BE REFFERED TO BEGIN THE INSTALLATION

The following documents should be opened to begin the exchange installation. These will give complete details of the exchange configuration, Layour, Procedures & Steps of physical installation, & commissioning. The installation & Commissioning of each exchange at each site is very SPECIFIC & should be done strictly according to the details in the specific documents.

The documents are 3-1-1 to 3-1-5, 10-1-1 to 10-1-8, 19 & OTHER SPEPCIFIC DOCUMENTS supplied like PACKING LIST, PRICE LIST etc. The first documents to refer are 10-1-1 & 3-1-1.

Chapter 1

General Architecture of Digital Switching System

A digital switching system uses the S.P.C. concept and a digital switch.

The following diagram indicates the basic building blocks of any digital switching system. (Fig.1)

Fig. 1

A brief description of the components is given below:-

1.1 Subs access interface: Analogue or digital subscribers make entry to the exchange at this interface. Analogue to digital conversion or ISDN protocol translation is done at this interface. Number of digital links (2 Mbps) are extended from this interface to switch. Allotment of T/S on one digital link is done by the subs interface logic. The information is carried digitally on allotted time slot and then switched to called side by a digital switch.

1.2 PCM interface: Any digital exchange can only accept intelligence in PCM decoded form and hence trunks from other exchange or links from remote subscriber units or other access systems e.g. V 5.2 will be inform of PCMs. These PCMs are terminated in a PCM interface. The basic function of the PCM interface would be HDB3/ Binary code conversion, CAS handling and forwarding CCS# 7 signals to suitable protocol handler. PCM interface on the other hand are connected to switch and other controllers.

1.3 Auxiliary interface :The auxiliary interface is again a service peripheral which take care of one or more of the following functions:-

(a) Tone generation e.g. DT, BT, RBT NU etc.

(b) MF Signalling dual tone

(c) Conference call facility

(d) CCS #7 protocol management

(e) Access Network (V 5.2) protocol management

1.4Controllers :Various controllers are required to control switching based on the digital informations received from subscribers or over the trunks.

The main control function are :-

1.4.1. Call handler (Register) : This is the control function which processes a call right from the point of seizure to called party connection.

1.4.2 Translator : This control function basically maintains all data base of subs & trunks and provides necessary information to call handler enabling the same to establish connection between calling links T/S to called link T/S.

1.4.3 Charger : Computation of charge based on set principles is carried out by this control function.

Other control functions could be controllers for connection, message distribution and formatting and defence for connections and CCS # 7 protocol management functions etc.

The various control processes may be centralised or distributed depending upon type of system.

2.The Switch : A digital switch of different configuration e.g. a pure Time Switch or a combination of time and space switches are used in different type of exchanges and various service peripheral like subs access/trunk access etc. are connected to this by n X 2 Mbps link as shown, Switch connections are established by controllers like call handlers.

3.OM functions : A general purpose computer is generally used with dedicated software to dialogue with the system in order to carryout various operation and mtce. activities like data base creation, fault/alarm message output diagnostics, creation of new equipments etc.

4. Additional Features in new Switches:New switches are capable of providing ISDN where in i.e. the subs loop is also digital. The ISDN feature necessiates CCS# 7 signalling also.

Chapter - 2FUNCTIONAL ARCHITECTURE OF OCB 283 SWITCH

1.The functional architecture : The main functional blocks of a OCB-283 switch are :-

Subscriber access sub system which carries out connection of different types of analogue and digital subscriber.

Connection & Control Sub system which carries out connections and processing of calls including PCM connections.

Operation and mtce. sub function which does the management of database and helps in carrying out various maintenance procedures in built in the systems.

Figure 1 shows general functional breakdown and figure 2 shows the detailed functional architecture of OCB-283 switch.

Fig. 2 (OCB 283 Functional Architecture)

The various connection and control functions in OCB-283 system are distributed with appropriate redundancy as indicated in the diagram.

2.Brief description of the functional components :-

2.1 BT (Time base) :Time pulses are generated in triplicate and distributed to LRs at Switching unit. The time base is usually synchronised with the network by a synch. interface. Synchronisation interface gets the clock from PCMs which carry traffic also and synchronises the local clock with the PCM clock and thus network synchronisation is achieved.

2.2 Host switching Matrix (MCX)/Switch Control Function COM

This is a pure time switch of maximum 2048 LRs connectivity capability. The switching of LR time shots are controlled by the function COM which in turn obtains the connection particulars from call handler known as Multiregister.

LRs are 2 Mbps binary coded PCM links with 32 time slots.

2.3Auxiliaries : Following auxiliary functions are available -Auxiliary Equipment Manager (ETA) :

The ETA supports the following function:

Tone generation (GT) e.g. dial tone, busy tone etc.

Frequency generation & reception (RGF) for R2 MF signal, tone dial reception etc.

Conference call facility (CCF).

Exchange clock.

2.3.2CCS # 7 Protocol Manager (PU/PE)

64 kbps signalling channels are connected to this by semipermanent link and carries out level 2 and level 3 of the signalling message transfer.

The defence and signalling link resource allocation is done by a control function PC.

2.3.3 V 5.2 Protocol Handler : The signalling protocol between an access network an d local exchange is processed and managed by this function.

2.4 Call Handler MR

This obtains necessary data from subs and circuits and process for connection and disconnection of call with the help of a database manager TR. In addition this helps in carrying out circuit tests and some observations.

Besides MR function there is one CC (Call Contorl) function which again contains register to handle CCS # 7 calls in conjunction with MR registers.

2.5Data Manager TR:

This function is responsible for managing and storing various subscriber and trunks related data base. The data is returned by the call handler MR as and when required during call processing.

2.6Charging function (TX):

This function is responsible for charge computation on the basis of certain charging parameters supplied by the translator during analysis of digits received from a source (Subs or Circuit). This also prepares detailed billing messages and forwarding the same to the operation & maintenance function for further processing. Besides the charge related function the TX also is responsible for carrying out some traffic observation on subscriber and trunks.

2.7 Matrix handler (GX)This function is responsible for processing and for defence of connections on receipt of :-

(a) request for connection and disconnection from MR or MQ (marker).

(b) fault in connection signalled by the switching controller function (COM).

GX also carrier out monitoring of connections and checks data links periodically..

2.8 Message Distribution function (MQ) marker:

Its function is to format if required and distribute messages

It also supervises semipermanent links .

Interchange of messages between different communication multiplexes.

2.9 PCM controller (URM) :

PCM interface receives PCM from other exchanges remote subs access units, access networks and digital recorded announcement systems and the URM function carrier out the following:

-HDB3/Binary code conversion

-Injection / extraction of TS 16 for CAS.

2.10 OM Function:

This function enables to create all data required for subs/circuits and their testing.

This also enables spontaneously issuing fault and alarm messages in case of indications coming from OCB units.

OM function further provides features for saving detail billing/ bulk billing messages on mag tape (cartridge) .

The OM function possess a two way communication path with the exchange system.

2.11Subscriber access function :

This functional component is implemented in CSNL/CSND or CSED and is responsible to forward new call connection & disconnection requests to control functions.

Chapter 3

Hardware architecture of OCB-283 Switching Systems

1.Various functional components discussed in the previous chapter are required to be implemented in some hardware unit.

For this purpose functions are classified as under:-

1. Subs access functions

2. PCM connection interface

3. Auxiliary functions interface

4. Control functions

5. OM function

OCB 283 system does not include the subs access systems but can support different type of subs access systems.

2.There are different type of subs access units like CSNL/CSND i.e. local and distant digital (Numerique) subs connection unit and CSED i.e. (Distant analogue subs connection unit).

A detail description of subs interface provided in OCB shall be discussed in yet another chapter.

3.Control functions Concept of station

For all control function or functions OCB-283 uses concept of a station.

Following type of stations are available:

3.1SMT:Trunk multiprocessor station This implements the URM function for PCMs i.e. responsible to handle CAS and be transparent to CCS# 7 signalling.

3.2SMA : Auxiliary multiprocessor station. These stations implement one or more auxiliary functions like ETA, PU/PE or V 5.2 functions. However, while ETA & PU/PE functions can be implemented in one station, V 5.2 function is implemented in SMA without any other auxiliary function.

3.3 SMX: Switch multiprocessor station This implements the switching function (COM) and contains the switch matrix system also.

3.4SMC : Command or control multiprocessor station.

This type of station implements one or more control functions like MQ, TR, TX, MR, GX, PC etc.

3.5SMM: Maintenance multiprocessor station implementing all OM functions. This supports process for, dialogue with OCB, data base management and handling spontaneous message generated by OCB units.

3.6STS : Synchronisation and time base station. This station is responsible for generating exchange clock and synchronise the same with the network.

4.GENERAL CONCEPT OF A STATION

A station in OCB is a hardware unit consisting of number of processors and couplers connected on a common bus referred to as BSM i.e. Multiprocessor Station Bus as shown below. Each processors or couplers is a Motorola 60830 processor with sufficient on board RAM and known as an agent on the BSM.

Each agent is loaded with one or more application e.g. MR. TR, TX etc. depending upon memory space required and traffic. The couplers besides supporting applications may supports other functions also e.g. couplers to connect token rings used for communication between different stations, couplers to support GT/RF/CCF and CCS#7 functions etc.

The diagram shows structure of a SMC type of station Fig. 1

Fig. 1

CMP : Principal Multiplex coupler for coupling to MIS token.

CMS 1 to CMS 4 : Secondary multiplex couplers coupling to 1 to 4 MAS tokens.

PUP : Principal processing unit.

PUS 1 PUS 4 : Secondary processing unit

BL :Local bus

MC : Common memory.

Functional architecture of different station are described in little more detail in subsequent chapters.

5.Inter Station Communication : The control stations communicate among themselves on a token ring called MIS i.e. Inter Station Multiplex, while the other stations are connected on 1 to 4 MAS i.e. station Access Multiplexes.

The concept of token ring is similar to the connection of computers in a LAN.

The MAS are connected to control stations also, so that the MAS domain units can communicate with control stations. Most of the time cross over from MAS to MIS domain or vice verse may require a gateway function and this is provided in the SMC with marker function.

The application softwares are referred to as logical machines (ML) and are loaded as per some standard configurations in various agents of a station.

The various logical machines are :

{MLMR, MLTR MLTX, MLMQ, M,LGX, MLPC, MLCC} SMC

MLPU/PE, MLETA, MLAN }SMA

MLURM

}SMT

MLOC, MLOM }SMM

MLCOM }SMX

Little more elaborate description of individual stations shall be discussed in the following chapters.

6. Redundancy Principles:For reliability reasons the provisioning of hardware is more than what is required as per traffic, so that either load may be shared or transferred. The redundancy criterion is different in different station.

(a) Station:SMCN +1 (N+1)th taking load on failure of any SMC.

SMA (PU/PE)(N+1) (N+1) th reconfiguring on failure of any of the N PU/PEs.

SMA (ETA)N (load sharing)

SMA (V 5.2)2 N (Pilot/Reserve)

SMX

2 N (Parallel)

SMT 2 N (Pilot stand by)

(b) Logical Machines : MR 1 to 7 , MQ, TX, TR, GX, PC are duplicate but PC works on Pilot/Reserve mode & all others on load sharing/mode. Number of MR depends or capacity and traffic.

Chapter 4

MAIN CONTROLS TATION SMC

1.Role of SMC:

All the control functions are supported in SMC and one or more of these functions can be used during call processing.

The main control functions are MR, TR, TX, MQ, GX, PC, CC etc.

Fig. 1

2.Environment of SMC : Relative position of SMC in OCB exchange is shown in the diagram fig.1. Control functions in SMC communicate on MIS. While other function (MLs) communicate with SMC on MAS. CSNs communication with PU/PE over CCS# 7 link. The PU/PE forwards the messages to SMC (MR).

3.Hardware architecture of SMC :

SMC station consists of following functional hardware components connected on a common bus known as BSM as shown in the diagram below :-

Fig. 2 FUNCTIONAL ARCHITECTURE OF SMC STATION

-One Principal Multiplex Coupler (CMP) for connections to MIS token ring implemented in ACAJA/ACAJB

-One to four Secondary Multiplex Coupler for Connection to 1 to 4 MAS token ring implemented in ACAJA/ACAJB

-One Principal Processing Unit PUP/ implemented in (ACTUR 5)

-1 to 4 Secondary Processing Unit - (PUS) also implemented in ACTUR5

-One common memory ACMCS

-Secondary alarm coupler (CSAL) implemented in ACALA

-Power supply convertors (DC to DC) 5 V 40A AE 5 V 40

4. Functional architecture of SMC

The functional architecture and the physical architecture of SMC is shown below diagrammatically.

Fig. 3

THE PHYSICAL ARCHITECTURE OF SMC4.1Function of various agents on BSM

4.1.1ACAJA 5 / ACAJB 5 as CMPACAJA 5 is a Motorolla 68020 processor based coupler with a 128 Kb EPROM and 4 Mb DRAM required for booting. This board is connected as an agent or BSM bus and connected to MISA ring. ACAJB 5 is similar to ACAJA 5 but there is no direct connector with BSM. It gets connected to BSM through ACAJA via a daughter board ADAJ and connects MISB.

This also supports registers ICMAT and ICLOG for storing hard and soft fault conditions.

The CMP :

-Enables communication between different SMCs & SMM on MIS token ring

-Enables loading of telephone application data

NB :A station gets inserted on MIS right on powering up but on MAS after getting initialised i.e. after application software are loaded.

4.1.2 ACAJA / ACAJB as CMS

-This control the exchange of messages with MAS domain units e.g. SMT, SMA, SMX etc. The informations are concerning channel associated signalling from SMA/SMT or messages related to connection/disconnection etc. with SMX.

-A SMC with marker function (MLMQ) does the job of linking messages between MIS & MAS domain. The messages may be like status setting/operational/and security defence related message.

4.1.3 ACTUR 5 AB as PUP

The PUP i.e. main processing unit also referred to as station processor routes the exchanged informations between different entities present in the station. Each executable function e.g. TR, TX, MR, MQ, PC etc. have their own exchange function requiring practically all the storage capacity of PUP.

The PCB presently in use is ACUTR 5 AB. This has Motorola 68030 processor with modularly expendable on board RAM in steps of 64 Mb. The PUP is connected to the common memory ACMCS over a 32 bit local bus.

4.1.4 ACTUR 5 AB as PUS :

The secondary processors hardware wise are similar to PUP but connected only to BSM.

The PUS generally support MR (MACRO) TX (macro) MQ exchanger etc.

TR and PC functions are essentially supported on PUP.

The processors ACTUR 5 AB consists of MOTOROLLA 68030 40 MHz processor with 128 Kb EPROM, 4 Mb DRAM registers ICMAT & ICLOG for storing hardware and software faults respectively and a local bus interface, and a BSM interface.

4.1.5 ACALA board :This is used as a secondary alarm coupler and do the preliminary processing of converter alarms for onward transmission to SMM over a MAL ring.

5.External Interfaces to the station :

(a) MIS and MAS rings : There are two rings referred to as A & B operating on loads sharing basis. The rings are connected at the back of the ACAJA/ACAJB on add on boards AIISM. There are two cables for each ring i.e. one coming from up stream station and other going to down stream station.

(b) MAL ring : There are two rings A & B in one cable connecting ACALA in different stations and finally to ACRAL board of SMM.

6.Internal Interfaces :

The BSM and the BL are the internal interface. While all agents are connected or BSM bus, PUP is connected to memory on local Bus. The station processor PUP use 32 bit BL for certain transactions.

BOARDS ORGANISATION IN SHELF FOR SMC STATION

The PCBs with their relative slot positions in shelf are indicated in the figure below:-

Location and rack assembly

Location

SOFTWARE ARCHITECTURE OF SMCThe software orgainsation is as under :=

The application Software which are supported by :-

A basic Software Hypervisor.

MLSM for communication, loading and defence.

Hypervisor Functions:

This is the software enabling more than one application e.g. MQ, TR, TX etc. to be supported on same agent and it performs:

-Communications within the station

-Management of time delays

-Time allotment for various applications.

The elemental tasks corresponding to an application is taken care of by a software SUPERVISOR which in case of MR & TX is known as sequences.

Thus Hypervisor is one per agent but supervisor is one per application on the agent.

General Software ArchitectureThis is explained in the schematic below :-

SOFTWARE ARCITECTURE OF A STATION

Fig. 6

5.2Examples of location of software machines

5.2.1 Small configuration P (Subscribers applications)

5.2.2Medium configuration (Subscribers application)

(a)SMC = TR + TX + MQ + GX + PC

(B)SMC = MR

(C)SMC = TX + MQ + PC

5.2.3Configuration TM (SSP application)

(a)Station SMC = PC + TR + GX + MQ + TX

(B) (B)Station SMC = CC + GS + MR (SSP application)

5.2.4Multi-component software machine : MLMR

5.2.5Multi-component software machine ML IX

5.2.6Multi-component machine : MLCC (SSP application)

5.2.7ML multicomponents : ML GS (SSP application)

The distribution of various application on various agents basically depends upon the traffic and certain standard configurations have been fixed for small, medium and large systems. There can not be any choice for a different combination of applications in different agents than those specified by ALCATEL.

DEFENCE:

In case of any problems encountered e.g. watch dog time out or a hard fault etc. the agent supporting the related application initiates a defence function and communicates to the SMM via CMP. SMM then issues appropriate fault or alarm messages and also initiates testing of faulty station for detecting any hard fault. The stations while extending malfunction message conveys the content of ICMAT & ICLOG registers for the connivance of SMM to issue appropriate message for maintenance personnel.

Generally an isolated message may not give useful informations but number of messages related to a function may give sufficient clue to fault.

POWER REQUIREMENT :

ACUTR 6.5 W at 5 V - 5 such boards total 32.5 W

ACMCS 3 board X 4.5 W per board 13.5 V

ACAJA5 boards X 1 UW per board 50 W

ACAJB5 boards X 3.5 W per board 17.5 W

Total 113.5 W

Hardware addressing :

Every station on token ring has a unique hardware address. The address is programmed by setting of a pair of dip switches provided on a daughter board AARCH at the back panel of the station as follows.

OFF = 1

ON = O

For 65% convertor efficiency consumption = 173.5

---------

.65

= 175 W at 48 V

Add 4 W at 48 V for ACALA

Thus total = 179 W

APSM

Physical address of SM (in a bits)

DOCP

Domain of coupler

TYCP

Type of coupler

TYOR

Type of organ

NOTE : Refer commissioning guide document for switch positions and value of the various fields set in the Switch.

Chapter 5

SWITCHING MULTIPROCESSOR STATION (SMX)

1.ROLE : A SMX is one module of the entire switch matrix system with independent control. The station is responsible for carrying out connection of an incoming LR time slot to an out going LR Time slot.

1.1FUNCTIONS :Switching may effect connection between subscribers, subscriber to junction, junction to junction subs to tone or RF, junction to tone or RF etc. or there may be a semi permanent connection for certain data link.

Besides the connection function, the SMX performs following other functions:-

Clock reception from STS and distribution.

Fault and alarm processing

Defence of the station etc.

2.SMX Environment - This is shown diagramatically in Fig. 1

The SMX is connected on 4 Mbs links (LR) to units like CSN, SMT and SMA referred to as service peripherals.

On the other hand SMX is also connected to control units over MAS token rings which provide particulars of connections to be effected.

The Network synchronised clock from STS is supplied to SMX. Switching is done on the strobe of clock and also this clock is supplied to the service peripherals i.e. CSN, SMT & SMA on LR links.

The inlets from other SMXs also make an entry to SMX as LCXE links.

3.BASIC FEATURES OF SMX

-The switch in OCB-283 is a pure time switch.

-Ultimate capacity of switch matrix is 2048 X 2048 LR.

-Modularity 256 X 256 LR in 8 SMX Module

64 X 64 LR matrix by adding PCBs

Each module of SMX is duplicated and Switching takes place in either branch parallaly .

2 Mbps access links LA issuing from CSN, SMT or SMA are converted into 4 Mbps LR links by a SAB interface card. The SAB is a functional component of SMX but the hardware is put in service peripherals. Branch is selected by receiving SAB functional unit.

Switching is done at 16 MBps rate but reception & issue of LR links is at 4 Mbps rate.

4.CONCEPT OF PURE TIME SWITCH A REMINDER

A pure time switch consists of a speech buffer a control buffer and a Read/Write controller. Digital Samples of data carried by TS of LRs are written sequentially in consecutive locations of the speech memory.

The control buffer contains the addresses of a location of speech memory to be read at a defined TS i.e. write operation on speech memory is sequential while read operation is controlled, by the contents of control memory

The contents of the control memory are based on the connection particulars decided by the MR by going through the call processing sequence.

Based on above mentioned logics, the functional architecture of a switch shall be as shown in diagram below:

Fig. 2 Functional Architecture of a Time Switch

Note: Control memory contents indicate a connection between TS 4 and RS 20.

Here speech and control memory constitutes the switch matrix. The digital samples of T/S of LRE are as it is reproduced in the speech memory e.g. location 4 contains the speech sample of TS 4. If TS 4 is to be connected to T/S 20 then location 4 of control memory should point to address of location 20 of speech memory and location 20 of control memory should point to address of location 4 of speech memory as shown. These contents are written by matrix controller by getting the connection particulars from MR.

5.1Functional Architecture of a SMX module in OCB 283

A SMX station uses the concept of digital pure time switch as discussed above and further provides a coupling to the MAS token ring for communication with control units for obtaining connection particulars. Also the station should have interface for receiving time links and the inlets from other SMX station for realising full availability of inlets in each station. Accordingly functional diagram shall be as shown below :

Fig.

Fig. 3 Functional diagram of SMX

5.2PHYSICAL IMPLEMENTATION AND PURPOSE OF PCBs OF SMX .

The MATRIX is constituted of RCMT and RCSM boards.

One RCMT board is capable of providing a square matrix of 64 LRs i.e. 64 X 64 Switchings are possible. Thus for one SMX module 4 RCMTs are required to cater to 256 LRs. Since we need to have the capability of switching any incoming LR time slot to any O/G LR T/S the LRs of other SMXs as LCXE links are multipled by providing RCMT boards. Thus in a SMX module 256 LRs are connected through LR interface (ILR) to 4 RCMT boards and there can be a max of 28 more RCMT boards provided in each SMX to receive inlet LCXE links from other (max 7) SMXs. Whereas number of outlets derivable are 256 only. Each SMX module therefore can be said to serve a max ,of 2048 inlets and 256 unique outlets. Of course the size of the rectangular matrix supported in each SMX will depend upon actual number of LRs and hence number of SMXs equipped.

5.2.1The connection of RCMTs/RCSM in a SMX branch are as shown below:

Fig. 4 Connection of RCMTs/RCSM in SMX

As shown in diagram max no of RCMT boards required is (4 + 28) i.e. 32, of which 4 belong to SMX itself catering to 256 inlets of its own and other 28 are referred to as receptors for the I/C (2048-256) LRs served by other SMXs. No of SMXs required will be as per traffic & no. of connector units.

Writing takes place on all RCMT boards corresponding to inlet in all SMXs and buffered in a RCSM boards corresponding to outlet in particular SMX to which the outlet belongs.

The ultimate capacity of switch 2048 X 2048 is realised in two group of 1024 X 1024.

The RCSM boards are provided for buffering the read output of RCMT (at 16 MHz), but set out at 4 MBPs in 4 groups of 16 LCSM links. The final readout is at 4 Mbps rate from RCSM board giving 64 LCXS links at 4 MBps . One RCSM can accommodate 64 LRs and hence 4 RCSMs are required. However for more than 1024 LR capacity each SMX

module needs extension shelf to accommodate RCMT boards. Inlets corresponding to the RCMTs in extension shelf when required to be switched to a outlet of SMX, the buffering is done in RCSM provided in extension shelf only i.e. max number of RCSM required for ultimate capacity of 2048 X 2048 will be 8 per SMX.

5.2.2The interface for LRs (ILR) is differential interface implemented by PCB RCID. Each RCID is capable of supporting 2 GLRs (or 16 LRs) and hence one SMX will have 16 RCID boards to cater to the 256 LRs. The RCID boards receive the LREs in serial format and convert the same to parallel 4 Mbps format known as LCXE links. Similarly the output from RCSM board is in parallel format (LCXS) Parallel to serial convertion again taken place in appropriate RCIDs board and LR s is derived.

5.2.3Read/write operations on the MATRIX System (Speech & control memory) is done by a MATRIX coupler implemented by a PCB RCMP. The RCMP carries out read and write operations at strobe of Network clock, which it receives in triplicate from STS. RCMP board has a majority logic decision interface for choosing the best clock out of the three received.

Read and write controls are independently carried out in the main and extension shelves. For this RCMP is provided both in main & extension shelves.

The speech buffer is duplicated & Read & write are done in alternate frames.

5.2.4SAB function is performed by different PCBs in CSN, SMT & SMA e.g. TCBTL (CSN) ICIDS (SMT 2 G) & ICID (SMA). This hardware units are a part of SMX but physically mounted in CSN, SMT or SMA.

6.0 What is SAB Function & How implemented

SAB stands for selection & amplification of branch. The logic used for selection of a branch is :-

(1) Sending unit calculates the parity in the data sent and sends the parity to receiving unit. Receiving SAB also calculates parity on data received and compares with parity received. If there is difference in parity or branch A and branch B then the one which matches with sent parity is chosen.

(2) A bit by bit comparison of data on branch A & B is carried out to check whether there is any change because this is likely even with parity tallying.

There should be a method to send parity bit from source to destination or an error indication either in parity received on bit by bit Comparision made. For this purpose three additional bits are required. Actually 8 bits are added in every time slot making 16 bits per slot i.e. the rate on LR link becomes 4 Mbps. This addition is done by SAB function.

Fig. 5 Position in SMX

There are two types of checks on connections in the two branches of switch.

(1) Permanent Check : This is done whenever a connection is made by calculating the parity and comparing the same with sent parity and also by making a bit by bit comparison of samples coming on two branches.

(2) Multiframe check : This type of check is initiated by GX when SAB defects a fault of switching and conveys the same to GX via COM.

Use of additional bits

In Permanent mode:Bit13 is O (Zero)

Bit14Value is Zero on O/P and I/P line and is 1 or input line if an error is detected in comparison.

Bit15Parity bit is sent

In Multiframe mode:

Bit13is use for marking multiframe of 32 frames. This bit will be 31 times 1 and 32nd time O. Thus a change from 1 to O marks end of multiframe.

Bit14on output lines it is control bit for multiframe and or input line is the status bit of the SAB.

Bit15reception of One bit of CRC every frame and after 32 frames 32 bit CRC is received.

Functions of various PCBs in SMX.

7.0Modular expansion from 64 X 64 LR matrix to 256 X 256 LRs by RCMT boards

(a) 64 X 64 LR

There are 4 64 X 64 LR matrices in a RCMT board as shown.

64 LREs enter the 4 RCID boards in groups of 16 and 64 LCXE links are derived . Four LCXE link at 4 Mbs/parallel are multiplexed to derive a 16 Mbps parallel link and at 16 Mbps the contents of Time slots are written sequentially in the speech memory of RCMT board. After switching in RCMT 64 LCSM links are received in four groups. The output is buffered in RCSM boards from RCSM 64 LCXS links are read out at 4 Mbps and by parallel to serial conversion again at the RCID board corresponding to the output GLRs LRs links are obtained.

As shown in the diagram for 64 LRs only one chip of 64 X 64 matrix out of 4 in the board is used. Others are used when the size of matrix grows. This is discussed case of 128 X 128 LR Matric (refer figure)

FIG. 7 (128 X 128) LR MATRIXFor 128 X 128 two RCMT boards will be required 64 LCXE will enter RCMT No. 1 & another 64 LCXE in RCMT No. 2 . By interaid connector the multiplexed LCXE link (L X S) 1t 16 Mbps from one RCMT is connected the 64 X 64 LR matrix chips in the second column n of second RCMT. Switching among the 128 LRs are thus possible in the 4 chips of 64 X 64 LR in first RCMT card only as shown. 2nd card in this case is used only to receive the 64 LCXE links and multiplexing these in to 16 Mbps LSX link. The interaid is done by a front connector between two adjacent RCMT board.

Case of 256 X 256 LR Matrix (Refer fig. 8)

The above concept is extended 4 RCMT cards are used and each pair of cards is connected in such a way that 2 X 128 X 256 LR connection is realised from two pairs of RCMT.

The same principal is further extended to realise bigger switch sizes.

Standard Racks

For 256 LRs

For upto 1024 LR

For beyond 102 4 LRs

both branches

Each rack will have

Requires extension shelves

in same rack

2 SMXs of one branchto accommodate additional

So two racks required

RCMTs i.e. beyond

for two branches for upto16 RCMTs

512 LR and 4 racks will

be required for more than

512 LRs

Fig. 9 Standard SMX Racks

Maximum No of rack required for ultimate capacity i.e. all 8 SMXs will be four per branch..

8.Function of PCBs of SMX

8.1RCMP:

There can be two RCMP boards in a SMX, viz one in min. shelf and other in extension shelf. The min, shelf RCMP carries out following function.

(a) Performs majority logic decision on BTT from STS.

(b) Clock distribution to RCID boards, main switch and extension with BSM bus.

(c) Interface with BSM bus.

(d) Serial transmission and reception of information with differential interface (RCID), main and extension switch.

(e) Generator of alarms towards ACALA board

The extension shelf RCMP carries out :

(a) Ensures retransmission to the boards of its shelf, the serial control link clock and signals received from main RCMP board

and

(b) ensures retransmission tot he main RCMP board of the serial link signals received from the boards of its shelf.

8.2 RCID board :

(a) Provides interface between connection units and switch matrix.

(b) Connection security.

(c) Help in fault location for locavar..

(d) Serial to parallel and parallel to serial conversion.

(e) Clock reception and distribution.

8.3 RCMT board :

(a) Time switching of 128 LCXE links to yield 128 LCSM links. (64 LCXE belonging to itself and 64 received from counterpart through inter aid).

(b) RCMT consists of two 128 X 64 buffer memory blocks. One of the blocks switches LCXE (0 to 127) lines towards LCSM (0/63) lines and other switches LCXE (0 to 127) lines towards LCSM (64 to 127) lines.8.4 RCMS board :

(a) Receives 64 LCSM links at 4 Mbps in four sets of 16.

(b) Sending of 64 LCXS differentially at 4 Mbps to boards of different interface with sifting at high impedance control for configuration above 1024 LR(c) Sending of time signals accompanying the LCXS lines to the differential interface boards if installed in the main switch.8.5 & 6 ACAJA / ACAJB and ACALA :

boards have their usual function like coupling to token ring and secondary processing of converter and time base related alarms respectively.

9.Layout of Cards in racks

LOCATION AND RACK ASSEMBLY

(1) Differential interface subrack

(2) Min subrack

(3) Extension subrack

Wiring of GLRs and LCXE as viewed from Rear of rack

PARTIAL REAR VIEW OF A SMX RACK

(indicating wiring for GLRs & LCXE Cables)

Wiring of GLRs and LCXE as viewed from Rear of rack

Wiring of GLRs and LCXE as viewed from Rear of rack

PARTIAL REAR VIEW OF A SMX RACK

(indicating wiring for GLRs & LCXE Cables)

Wiring of GLRs and LCXE as viewed from Rear of rack

CHAPTER 6Auxilary Multiprocessor Station (SMA)

1.Function of SMA

Tone generation (GT)

Conference call (CCF)

Frequency generation & reception for R2 MF signalling or for receiving DTMF frequencies (RGF)

Clock

CCITT 7 signalling management (PU/PE)

Access network management (AN)

2.SMA Environment

to other stations

The SMA is connected to the switch by one GLR (i.e. 8 LR links), On the other side it is connected to MAS token ring over which it communicates with control units. A MAL ring collects converter alarms of the station. The time base is obtained by the SMA from STS via the switch over GLR cable.

3.Functional Architecture of SMA :

A SMA station can provide following functions (O) combination.

ETA & PU/PE

PU/PE alone

ETA alone

AN (access network) alone.

First two SMAs essentially have GT functions and clock function besides other ETA or PU/PE functions.

For the above functions and to adapt on token ring different type of couplers and processors are provided. The functional name and PCB names are listed below:

-CMP- implemented by ACAJA5/ACAJB5 or ACAJAG ACASB4

PUP- ACJTR5 AB

PUS - ACUTR5 AB Only one PUS

MC (Common memory) ACMCS

Coupler CTSV i.e. coupler Traitement Signal Vocal or Voice signal processing couplers.

These couplers are used as GT, RGF, CCF and as psophometer.

-Coupler CSMP-Coupler signalling Multiprotocol for CCS#7 or V 5.2 signalling implemented by ACHIL 2 & ACHIL 3 PCBs.

The functional architecture is indicated diagramatically below:-

4.Board Functions:

4.1ICTSH/ICTSS

These cards can perform following functions

(a) Conference call facility - 8 numbers of 4 party conferencing is possible with following features:-

(i) Add on conferencing with discreet listen in

(ii) Call hold indication

(iii) Making operator call

One ICTSH board can implement 8 such facilities.

(b) Tone generator function : (GT)

This function is for generation of tones like dial tone, busy tone etc. The frequencies may be single or combination of one two three & four frequencies with different pauses.

One ICTSH board generates 32 voice frequency signals.

(c) Frequency reception & generation function (RGF).

This function takes care of generation and reception of dual frequencies used for R2 MF signalling One ICTSH board can implement 8 RGF terminals and one ICTSS board 16 RGF terminals.

(d) Modulation detection function:

This function carries out supervision of modulation on recorded announcement time slots. This is processed as a particular RGF code defined.

4.2 ACHIL 2 Board :

This board carries out HDLC level 2 functions for 16 channels. There are two servers carrying out following functions:-

HDLC direction:

Sending-Sending flag, CRC Calculation and O insertion

Receiving-Elimination of O inserted, flag framing, CRC verification.

CCITT 7 direction

Send

-Automatic sending of filler frames

Receive-Automatic elimination of filter frames which do not carry useful information.

4.3ICHOR Board

This board ensures generation of accurate exchange clock required for correctly labelling various messages flowing between various units.

4.4ACAJA/ACAJB card:

This board provides coupling of SMA station with token ring over which communications is made with control units.

Following type of informations are exchanged:-

CAS R2 MF signalling

Status messages and CCS# 7 related messages

4.5ICID Board (One for each branch of SMX)

Receptor of 8 LRs and associated time base from RCID board of SMX and convertion to LA to give to SMA and similarly converting LA link to LRE toward RCID of SMX.

Mutual help to extend LR link to counterpart ICID for the purpose of bit by bit check

Processing of additional bits on LR

Selection of time base (4 MHZ)

Distribution of 8 access links (LA)

Case : 1SMA 1 or SMA 2 with clock, GT, RGF and ACHIL function.

LA 1-CCF

LA 2-GT

LA 3-ACHIL

LA 4-ACHIL

LA 5-2 RGFS

LA 6-2 RGFS

LA 7-2 RGFS

LA 8-1 RGF

Case : 2Where GT & clock are not there i.e. SMA 3 onward.

LA 1 & LA 2toTwo CCF (ICTSH)

LA 3 & LA 4TOTwo ACHIL

LA 5, LA 6, LA 7, LA 8 each to pair of RGFs (Total 8 RGFs)

Total 12 Couplers

SMA Rack card layout:

AAAAAAIIAAIIIIIIIIAIIA

ECCCCCCCCCCCCCCCCCCCCE

5AAAUMTTHHTTTTTTTTUII5

VLJJTCSSI

LI

LSSSSSSSSTDDV

40ABARSHH22HHHHHHHHRAB40

14232933414753596571778185899397101105113119125142

Slot41-ACUTR 5 AB-PUP

Slot 53-ICTSH for CCF

Slot59

ICTSH for GT in SMA 1 & SMA 2 and

for CCF in other SMA

Slot 71, 77, 81, 85, 89, 93, 97, 101 ICTSH or ICTSS for RGF

Slot105either ICTSH/ICTSS for RGF or ICHOR (SMA 1 and SMA 2)

Slot119 & 125 are ICIDs for SABA & SABB function

TYPE OFRACKS MOUNTING SMA :

UC UE

SMCSMC

SMASMT

SMASMT

SMASMA

& MASMA

SOFTWARE ARCHITECTURE

Following Software machines in different combination are loaded in SMA depending upon requirement:

MLSM (P)

in CMP

MLSM (ACHIL)

in ACHIL board (for level 2 function of CCS # 7)

MLSM (S) + ML PU/PEin PUP for CCS # 7 protocol management

MLSM (S) + MLETA

in PUS for ETA function

Firmware for GT, CCF, RGF, etc. or various

CTSV (ICTSH or ICTSS) depending upon

Slot locations as indicated earlier.

CHAPTER 7

TRUNK MULTIPROCESSORS STATION (SMT)

1.GENERAL :

The SMT is a interface for PCMs coming from RSU, RLU (E-10 B CSED) and as junctions from other exchanges.

With the initial supply of OCB-283 exchanges first Generation SMT (SMT 1G) was supplied and subsequently SMT-2 G replaced them since no more SMT 1 G are existent in the field only SMT 2 G is included in the handout. The functions of SMT are same whether it is SMT 1 G or SMT 2 G. SMT 2 G is more powerful and intelligence is extended at the PCM terminal level.

2.Function of SMT:(i) Provide terminations of a maximum of 128 PCMs from trunks, CSED and CSNDs.

(ii)Carrying out URM (Multiplex connection unit function) consisting of :

(a) HDB 3/ Binary code conversion.

(b) Injection and extraction of CAS on time slot 16 and making over to another functional unit called CLTH for processing.

(iii)Transforming the intelligence in PCM TS to LR T/S for switching to destinations TS and transforming the switched LR time slot into PCM TS.

3.Specific features of SMT 2 G :Beside above mentioned general functions of SMT following special features are available in SMT 2 G.

(i) Digital Access cross connect (DACS) where the additionals bits (bit 8 to 12) can be used to carry channel associated signalling for PABXs with linked numbering scheme.

(ii) Can support higher order PCM multiplexes e.g. 34 M bit /S.

(iii) Can support ISDN PRA (30 B + D) links.

(iv) Reduction of load on MIS/MAS by introducing decentralised processes in a software way.

4.SMT Environment :

SMT on one end receives the external PCMs which are HDB 3 coded and after decoding in Binary extends LR links to Switch matrix. For the purpose of communication with the control stations SMT is connected to MAS token ring. For reliability reasons SMT logic part is duplicated and there is a link for inter communication between two logic parts. The timing links for synchronisation are also derived from some dedicated PCM terminals of SMT. Accordingly the environment of SMT shall be as shown diagramatically below:

Fig. 1 SMT Environment

5.General Architecture of SMT 2 GThe SMT 2 G Comprises following three functional components.

(a) Exchange termination (PCM termination) which is not duplicated.

(b) Control system for processing the CAS, Comprising two processing sub systems known as SMTA and SMTB.

(c) SAB function one each for issuing LRC links Switch matrix systems branch A and branch B.

6.Internal Architecture of SMT 2 G

The internal architecture is as shown in the diagram below. (Fig. 2)

As already mentioned before, the SMT consists of three parts viz. logic part (duplicate) PCM terminator part (not duplicate) and the SAB part.

Interconnection of the three components are indicated in the diagram.

6.1 The PCM part is implemented on a functional unit known as ETU (Exchange termination unit) which consists of 4 ET (exchange termination for 2 Mb/s PCM) and 4 ETPs i.e. ET processor. Partial processing of PCM & CAS signals is carried out by ETPs.

6.2The logic part is duplicated which on one side is connected to ETU by BETP bus and on the other side is connected on MAS ring via coupler for communication with control units.

There are signalling links, Switch over links and PRS (Pilot/Reserve) links between the two parts of logic.

The information on the PCM Time Slots are subject to a code conversion i.e. HDB 3 to binary for incoming junction and Binary to HDB 3 for O/G junctions at the ETU level. The binary coded access links (LA) are connected to SAB unit which issue a 16 bit LR link toward the Switch matrix.

6.2.1Processing Subsystem architecture :

As already mentioned before there are two processing system which can work in pilot/standby mode, normal/back up mode or load sharing mode. Usually

Pilot/Standby mode is used. The active subsystem is chosen by a hardwired device supported by the first CLTH (HDLC Trans link coupler) out of two.

The processing system architecture is as indicated below: (Fig.3)

NB: PUP is optional

CLTH means HDLC Transmission Link Coupler.

(Fig. 3)

6.3SAB Function Part Organisation

For selection and amplification of branch there are couple of cards for issue and receipt of LR links for branch A and B towards SMX. The SAB functional unit is a part of SMX and implemented by hardware housed in SMT. Entire SMT is broken up into 8 modules referred to as a URM supporting 16 PCMs or 2 GLRs (PCM on external side and GLR towards the switch). A pair of PCB ICIDS is associated with each UR performing SAB function for branch A and branch B.

Fig. 4 SAB function

There is an inter aid link between branch A and branch B SAB function card for the purpose of receiving the sample of TS on counter part branch so that a comparision may be possible.

7.Functions of the hardware components of SMT :7.1 ETU : The ETU i.e. exchange termination unit is implemented on a PCB ICTRQ and this consists of 4 ET (exchange termination for PCM) and 4 ETP (exchange termination processor)

This card carries out following functions:

(a)HDB3 Binary conversion for 120 ( PCM

(b)Looping of PCMs viz. external, internal, both side and through connection. This is done by a connector (4 connectors are provided per ICTRQ PCB). There is a arrow mark on the connector and type of loop depends on the direction of arrow as shown below: (Fig. 5)

Fig. 5 Hardware link for PCM looping

(c) Synchronisation on local call

The time slot contents are received and buffered at the clock rate coming from other station but are read and switched at local clock rate. The local clock itself is synchronised with the network by extracting clock from some defined PCM s .

(d) CRC 4 :

This cyclic redundancy check is an optional feature and is performed for measuring the transmission quality of 2 Mb/s PCM s .

(e) Alarm Processing:

The ICTRQ board has a alarm processing sub function for handling following type of alarms:-

F I i.e. fault indication alarm

Failure of clock by code convertor part

Frame loss

Faulty ICIDS etc.

Alarm conditions are conveyed to CLTH for onward relaying to CMP and then to central defence i.e. SMM for editing and message output on appropriate terminal.

(f) Processing of positioning messages sent by CLTH. The position messages are:-

Disabling recognition of signalling transition on PCM link.

Loop on TS 0 for LA continuity check (refer GLRCT command)

For CAS looping I/C trunk on O/G trunk

Trunk assignment control

Micro controller reset control etc. etc.

(g) PCM LA Switching

There is no cross connection between PCM T/S and LA T/S. These are one is to one. A 8 bit to 16 bit conversion is also done at ICTRQ card level so as to make use of DACS, unlike 8 bit/16 bit conversion by SAB in other cases.

All T/S except TS 16 and TS 0 are switched through between PCM end to LA end.

(h) Signal processing:

In case of CAS TS 16 is injected (for O/G calls) and extracted for I/C calls. The signalling information for I/C calls is made over to CLTH for forwarding to MR for handling the call. For O/G calls signalling conditions are conveyed by MR to CLTH via CMP of SMT. CLTH in turn makes it over to ICTRQ which injects appropriate bits in TS 16 for onward transmission over PCM. For CCS#7 signalling the ICTRQ card remains transparent.

The ICTRQ also processes the CAS and semaphore signalling from CSED of E-10 B.

(i) Synchronisation link for STS

There are defined ETU ET for deriving timing clock from receive part of PCM to drive the synchroniser part of STS.

(j) BETP bus management:

BETP is a full duplex point to multipoint bus connecting one CLTH to 64 ETP. In order to ensure communication between only one ETP and one CLTH a contention system is designed. A ET wanting to send a message has to claim the BETP bus acquire this and then send the message.

7.2 Processing System :

This consists of principle coupler implemented by ACAJA 4/ACAJB 4 or ACAJA 5/ACAJB 5,

CLTH function implemented by two ICTSM boards

Common Memory implemented by ACMGS board.

The multiplex coupler and memory board functions are already covered elsewhere.

7.2.1Function of CLTH (ICTSM board) :

GENERAL ORGANISATION OF ETU ( IET + IETP) ICTRQ

HDB 3 BINARY

* RESYN RECPCMON

* SYNCH MUL. FR.

CALCULN. OF CRC 4 LOCAL TIMER

* SIGN. INJ/EXTRN.

AND INJN. ON TRANS* RETRIEVAL OF ALM

* DETN/CONFN OF STATUS TRANSITION

AND CRC 4

* TRANSFER OF DACS SIG ON LA

* FR. & MF ATRANS.

* LINE QUALITY MONTR. TO

This board is organised around a 68030 CLTH microprocessor (PCLTH) having a 4 Mb DRAM and BSM interface. There is a second microprocessor in this board known as HDLC microprocessor for supporting ETP interfacing over BETP bus.

Messages related to signalling from MR are received by PCLTH through common memory.

PCLTH after checking address of destination transfer this to PHDLC.

PHDLC checks the address. If the address is for a ETU then transfers the message in HDLC format to the ETU.

The other functions supported by CLTH are:-

Inter SMe dialogue : For this the first ICTSM board is linked to its counterpart by a HDLC link known as LISM link.

SMe switch over management device implemented only on the first ICTSM.

Transmission architecture in CLTH is shown diagrammatically in Fig. 6. Fig. 7 explains the communication between CLTH & ETP

MESSAGE FLOW FOR NEW CALL

(THROUGH VARIOUS LOGICAL MACHINES)

7.3Functions of ICIDS board :

Interface for LAS sending to ET and LAE receiving from ET.

Receipt of timing distribution signals H 4 M and SBT from the RCID boards of the host switching matrix (MCX).

Interface for timing distribution signals DH 4 M and DSBT between the boards of the SMT and MCX.

Branch selection on LRS channels, based on parity fault with choice of branch dictated by MCX.

Resynchronization on 16 LRS (in groups of 8) originating from the two MCX branches and transmit mode amplification of the 16 LRE (in groups of 8) to an MCX branch.

Backup links on 16 LRS between the two branches of the MCX.

Processing of the three control bits crossing the LRE and LRS. Recognition of parity faults and check multiframes on request.

Implementation of the LR link loop back function for LOCAVAR purposes.

Implementation of the LA link loop back for LOCABAR purposes with regard to TMIC (LAE to LAS loop). Loop back controlled by a positioning signal from the TMIC and operates in the space domain (looping the entire link). To minimize the equipment needed for the loop back function, it is initiated with timeslots rearranged (offset).

NOTE: The ICIDS boards are entirely independent of the ACTIVE/STANDBY concept, which remains an operating mode affecting only the control system, if adopted.

.

8.Physical form of SMT 2 G: (The physical connection of components of SMT on BSM is shown in the diagram.

Fig. 9 (Physical architecture of SMT 2 G)

9.SMe Switch over :

There are two switch over modes :

(a) Forced switch over Calls being set up are lost.

(b) Controlled switch over No calls are lost.

The switch over is always activated by Active SM.

Forced switch over is controlled by CMP in response to serious hardware fault in the station controlled switch over is always activated by program.

10.Software Organisation :

Just like other stations the application ML are supported on a basic software (Hypervisor) and on the system software.

The hypervisor allows cohabitation of more than one ML on same agent, and carries out following:

Communication within the station

Management of time lags Processor sharing by different MLs .Supervisor in each agent takes care of elemental tasks.

The applications are :-

(i) MLSM (P) loaded in CMP.

This carries out positioning, defence, audit security and communication.

(ii)MLSM (GETU) loaded in CMP

This carries out the management of ETU

(iii)MLURM (P) - Main component of MLURM loaded in CMP.

This carrier out

-Communication with control units

Context Management

Timing Management

Handling UR/TS/EQ/LR positioning

CSED positioning]

UR-PCM extension

Observation

Initialisation of exchange date

Traffic migration inch

Regeneration

1. MLURM (S) secondary component loaded on CLTH carrying out

Processing of TTC tables

CCS#7 processing

Inch of PRS configuration

Switch over supervision

Regeneration, alarm processing PCM & CRC4.

Fig. 10 Software Architecture

Fig. 8 Indicates message flow for a new call, while passing through various logical machine functions.

Chapter 8Maintenance Multiprocessor Station (SMM)

1.ROLE : The SMM provides the facility for carrying out operation and mtce. of OCB units and also manage the data base.

1.1It carries out following functions:-

(a) Data base management and storage (secondary)

(b) Central defence of the OCB system

(c) Supervisor of token rings

(d) Processing of various commands

(e) General initialisation of the exchange.

It provides local link for data processing devices and administration terminals. This can also be connected through X-25 link to a network management system (NMS).

2.SMM ENVIRONMENT :

In order to carry out the function mentioned above the SMM should be accessible to exchange units on one side and to the dialogue peripherals on the other side. The SMM should also have access to mass storage devices for storage of data. Accordingly the environment shall be as indicated belowFig. 1

3.HARDWARE ARCHITECTURE :

The SMM consists of two processing subsystem. One acting as pilot and other as a hot standby. Both systems share a common communication bus supporting various communication peripherals and common SCSI bus for access to mass storage devices. The two subsystems are referred to as SMMA and SMMB.

The overall, hardware architecture is indicated below in (fig. 2) and Fig. (3).

4. PROCESSING SYSTEM :

The processing system comprises following functional component connected on a common bus referred to as the X-bus.

(a) Processor Memory pairs (ACUTG 2 ACMGS)

These boards support the RTOS operating system and application software running in SMM. The ACTUG 2 board is built around Motorolla 68030 processor (40 MHZ) with 16 mb private RAM. ACMGS is a 16 Mb RAM. This can be addressed on 4 G bytes by X-Bus on local Bus (BL).

One to four such processor memory pairs can be provided depending upon amount of processing required.

(b) Duplex Coupler ACCSG board:

This is the board that provides communication between two subsystems and also provides keys for carrying out different modes of initialisation and reset. This also provides for connecting assistance console terminals.

This board is also responsible for control of locavar on stand by SMM system.

(c) Terminal Bus Coupler or Communication coupler ACFTD :This coupler supports the input output processor. The operating system of this board (SYSPES) enables handler software to perform terminal bus line management functions. The terminal bus issued by the ACFTD board can support X 25, V 24 links and alarm link. For different communication protocol different handlers are provided.

(d) SCSI Coupler ACBSG board :

ACBSG board supports complete input/output software for SCSI bus. ACBSG also has ROM resident software controlling SCSI access, used when initialising processing unit. There are two ACBSG boards, each supporting two SCSI buses. The mass storage devices like hard disks, streamer and mag tapes are connected to these SCSI buses through appropriate couplers.

(e) MIS or Secondary Coupler ACAJA/ACAJBThese are usual coupler for coupling to MIS token ring.

9 Console functions:The console function consists of some physical keys and lamps on the ACCSG board edge strip and the PCB. These are :

Switch V 1 : middle position normal lower position for automatic RTOS startup

Switch V 2 : up position temporary reset middle position is normal lower position is for permanent reset

Switch I 1 :up position for manual start & down position for automatic start

Switch I2 :relevant only when I 1 is down i.e. if. It is up with I1 down and a reset is given by V2 up then OM & exchange both will initialise and If I2 is down with I1 down and reset is given then only OM will initialise with through connection to exchange.

lamp D 1 when lit indicates pilot system

D 2 when lit indicates RTOS loaded in system.

It addition to these keys there are two more physical keys V 3 and V 4 on a DACLE mini board placed behind ACCSG board in the back panel.

Switch V 3 up position is the idle position middle position (stable) defining sub system always master. lower position (instable) indicating sub system is master.

Switch V 4 up position is idle indicates manufacture absent mid position (stable) and lower position (instable) indicate manufacturer present.

6.LOGICAL KEYS

Beside the physical keys there are a set of 48 logical keys. 16 keys are dedicated to RTOS, 16 keys are divided between RTOS and TMNK, sixteen keys are dedicated to OM. The logical keys can be set in assisted mode (V 1 down) from console and in RTOS environment by MMC from WAM. Normal setting of these keys is Zero but depending upon requirement. These can be set. Some of the key settings are defence of the system. Only with the V 3 switch set to manufacturer present state the dangerous keys can be set.

7.LINE COUPLERS:

Besides the X-Bus components there are different line couplers for different type of peripherals.

The peripherals used are

TTY, CV, IR & WAM type of terminals. These type of terminals are connected to asynchronous lines derived from ACTUJ boards. One ACTUJ board gives eight asynchronous lines. A max of 48 asynchronous line can be derived from a max of 6 ACTUJ board. ACTUJ board consists of an EPROM (for self test and code loading function via terminal bus) and a coupler software on ACFTD board of X-Bus supporting the terminal bus.

Other peripherals could be computers at NMS connected to SMM over 64 Kbps X-25 links. These links are derived out of PCB ACJ64. One ACJ64 card can support 4 synchronous links. The ACJ 64 boards are connected or terminal bus supported by ACFTD board. In new supplies ACV11 board is being supplied which has inbuilt modem.

In addition to the synchronous and asynchronous line couplers the terminal bus also supports MAL rings through line coupler ACRAL 2.

8.Alarm processing function : Just as other stations SMM also has ACALA board one in each system to take care of convertor alarms in main shelf and for streamer also.

9.Mass storage Devices:

The following mass magnetic storage devices are placed on the SCSI bus derived from ACBSG boards. These devices are used for data management and loading.

9.1 Hard disk (ACDDG 2)

This PCB is an integral PCB supporting a coupler to SCSI bus and disk drive. The disk capacity supplied at present is 4 Gb or 10 Gb. There are two hard disks supported on different controllers of SCSI bus and physically mounted in the SMMA and SMMB shelf. These are known as DISK A and DISK B.

9.2 Quarter inch Streamer (ACSTG 2)

Generate visual indicator related to alarms on edge strip of RCHOR board.

5.1.3 ACALA board:

There are two ACALA board One ACALA processes the alarm related to RCHOR and its converters and second related to RCHIS and its converters.

6. Operating Regimes of STS :

The operating regimes depend upon various factors like :

Operating Regimes of STS link missing

HIS faulty or out of service

RCHOR faulty or out of service.

The following regimes are automatically generated by STS>

6.1 Normal synch regime:

STS is synchronised with one of the several synch links like LCAL, LSRX or LSRO to LSR3.

6.2 Normal independent regime

In case of loss of synchronisation (i.e. missing of external synchronisation links..

The RCHIS contribute to give out the last memorised frequency and drives the RCHOR.

6.3 BTT regime :

The RCHIS no longer drives the BTT but the RCHORs continue to deliver the last memorised frequency at the time of faul in RCHIS.

6.4 Free Oscillation Regime :

The STS is used with the synchronisation links. The frequency delivered is that generated in free run mode of the RCHOR. The frequency stability is defined by factory calibration.

7. Identification of the input and output links7.1 HIS : reception

4 DLSR 0 to 3 links (2048 KHz) and 4 DLVE 0 to 3 links (for validation) common to the 2 HIS

DLSR : synchronous differential reception link.

DLVR : validation differential reception link.

1 to 2 DLSRX links (0 for HISO and 1 for HIS 1) at 2048 KHz.

DLSRX : external synchronous differential reception link.

1 to 2 LCAL links (0 for HISO and 1 for HIS 1) at 5MHz.

LCAL : Calibration link

DHAM link (0 to 2) at 4096 KHz sent by BTT.

DH4M : clock differential at 4.096 MHz.

1 5 MHz LCM link (0 for HISO and 1 for HIS 1) sent by other HIS.

LCM : mutual control inks

7.2 HIS : receiption

3 DSY8K 0-2 links (8 KHz) and DMSY 0-2 (validation) to BTT from each HIS.

SDY8K : 8 KHz synchronous differential.

DMSY : non-synchronous differential

1 5 MHz LMES link ( 0 for HISO and 1 for HIS 1)

LMES : measurement link

11 alarms to ACALA board from HIS modules.

HISO and HIS 1 sends :

NFLSRi : LSRi (i = 0 to 3) no fault,

NFLSRX : LSRX no fault

HISO sends :

AHISO : HISO alarm

FHISO : HISO fault

MSHISO : non synchronous HISO

HIS 1 sends :

AHIS 1 : HIS 1 alarm

FHIS 1 : HIS 1 fault

MSHIS 1 : non synchronous HIS 1

7.3 RCHOR : reception

1 DSY 8 K link and 1 DMSY link for each HIS

7.4 RCHOR : transmission

1 4096 KHz DH4M link to each HIS.

DH4M : 4.096 MHz clock differential

16 8192 KHz DLH8M links and 16 DLSBT links at 8 KHz.

DLH8 M : 8.192 MHz clock differential link

DLSBT : time base synchronization differential link

6 alarms to an ACALA of BTT module.

NFHISO : non-clock fault (i= 0 to 2).

NFHISO : HISO no fault.

NFHIS 1 : HIS 1 no fault

NMSEXT : external synchronization present.

7.5 ACALA board for HIS module

This board receives alarms from HIS and 2 converters (no 48 and + 5 V, over current)

It sends these alarms on an alarm ring.

7.6 BTT module ACALA board

This board receives alarms for 3 RCHOR boards and 3 converters (no 48V and + 5V, over current)

The board sends all these alarms on an alarm ring.

8.1 Visual signalling on HIS module

D1 red :

-steady

=HIS alarm

-flashing=HIS alarm by manual deactivation

D2 red:

-steady

=no HIS external synchro (free oscillation)

D3 green:-steady

=synchronization on LSRX

D4 green:-steady

=synchronization on LSR

D3/D4 :

-flashing=synchronization on LCAL (external calibration)

V1 INTER :-momentary high position

=activates sequence for reinitialization of configuration (definition of synchronization link priorities)

- middle idle position

=normal operation

- permanent low position

=manual deactivation (conditional)

AR green :- steady

=rapid control status

LX green :-steady/flashing=active LSRX input

L3 green :- steady/flashing=active LSR3 input

L2 green :- steady/flashing=active LSR2 input

L1 green :- steady/flashing=active LSR1 input

L0 green :- steady/flashing=active LSR0 input

8.2 Visual signalling of BTT module

D1 green :-off=clock error on RCHORO

D2 green :- off=clock error on RCHOR1

D3 green :- off=clock error on RCHOR2

D4 red:-lit=lack of external synchronization on BTT (free oscillation)

V1 green :-off=no HIS 1 synchronization

V2 green :- off=no HIS 0 synchronization

Fig. 2 STS station sub rack assembly

LOCAVAR & DEFENCE

EPABX

OCB-283

PACKET SWITCH

Intelligent Network

VALUEADVDED

NETWORKS

VANS

Broadband

ISDN

TMN

TELECOMM MANAGEMENT

NETWORK

MOBILR

TELEPHONE

OCB

Local

network

Telephonic

network

Intelligent

network

STS

RCX

Subscriber

access

SMT

SMT

SMX

Signalling

network

SMA

Data

network

SMM

SMC

SMC

SMC

RCX : switching matrix

TMN : telecommunication management network

SMA : auxiliary equipment control station

SMC : main control station

SMM : maintenance station

SMT : trunk control station

SMX : matrix control station

STS : synchronization and time base station

TMN

OCB/283/SYS/0005 AA