TransXpressTransWave WLWDM Line System

TransWave WL is the con-sequent further develop-ment of the WL8 opticalmultiplex wavelengthsystem. A larger number ofchannels and the prepara-tion for STM 64 signalstogether with a widerrange meet the require-ments for universal applica-tion now and in the future.

Modern transport net-works have to guaranteethe transmission of thehighest possible bit ratesso that network provi-ders can continue tooffer attractive servicesto their customers with-out restriction.With the WDM LineSystem TransWave WL(Fig. 1), Siemens provi-des a cost effective andfuture proof way of bridging long distanceswith high bit rates.Using optical leading-edge technology leadsto a very clear moduledesign.This permits the designof compact transmissionsystems which are setup with a number ofchannels according tothe individual require-ments of the networkprovider for both shortand long distances andcan be upgraded withincreasing requirements.

Features

• Fast, low-cost provision of hightransport capacities.- Transmission capacity of up to16 x 2.5 Gbit/s, i.e. 40 Gbit/s onone optical fiber pair.- Prepared for the transmissionof 16 x 10 Gbit/s, i.e. 160 Gbit/son one optical fiber pair.

• Optical transmission withoutelectrical regeneration up to1200 km (for 8 channels) or upto 900 km (for 16 channels).

• Particularly cost-effectivepassive system without opticalamplifiers for distances up to 80 km.

• WDM interfaces according toITU-T Recommendations.

• STM 16 interfaces suitable forsystems SL16 series 1 and 2,SL64, SMA16 and SXA.

• Interfaces of OEM devices orthose with other bit rates can beconnected via TransWave WTT(Transponder).

• Optical add/drop multiplexer(fixed) available.

• A universal subrack as well asonly four module types for thedesign of all WL network ele-ments WLT, WLP, WLR andWLD.

• Optical supervision (monitoringpoints) during operation.

• Future-proof by upgradingpossibility on up to 48 channels(optical access points).

• Suitable for future integrationinto purely optical networks.

2

Bridging long Distances with highBit Rates Cost-Effectively

Fig. 1 Example of a network element of the TransWave WL system

WLTp WLTp

1

8(16)

...

1

8(16)

...

WLT WLT

1

8(16)

...

1

8(16)

...

WLTe WLTe

1

8(16)

...

1

8(16)

...

WLDWLP(n)

WLDWLP WLP(n)

(VOA)(VOA) (VOA) (VOA)

. . .

(VOA)

1 8

. . .1 8

(VOA)(VOA)(VOA)DCF DCF

3

Fig. 2 Design of the WDM Line System for different applications

Passive system without optical amplifiers for distances up to 80 km

Standard system with optical amplifiers for distances up to 600 km (max. 8 transmission sections)

Upgraded system with optical amplifiers for distances up to 1200 km (max. 14 transmission sections)

Fig. 2 shows the basic design oftransmission links for short,medium and long distances withthe various network element typesof the WDM Line System.

There is an 8-channel system witha frequency pattern of 200 GHzand a 16-channel system with afrequency pattern of 100 GHz.

The 16-channel system can thenbe designed with 8 channels andlater upgraded to 16 channelswithout service interruption. Thiscan be done without replacing theoptical amplifier.

When using optical access points,subsequent expansion to up to 48 channels is possible withoutinterrupting operation. Alreadywith a passive system consistingof only two optical line terminalsWLTp which, in this case, includeonly the optical multiplexers anddemultiplexers, distances of up to80 km can be bridged. This leadse.g. in Metro Networks to verycost-effective solutions.

When using optical amplifiers inthe WLT and on the link (opticalline amplifier WLP), the range canbe increased up to 600 km withoutelectrical regeneration. When

using 16 channels, the opticaltransmission characteristics of thelink can be optimized by means ofVariable Optical Attenuators (VOA).

To reach particularly long distancesup to 1200 km (for the 8-channelsystem) without electrical regene-ration, Dispersion CompensatingModules (DCM) are used in theoptical line amplifiers WLP.

The optical add/drop multiplexerWLD may be used instead of aWLP. The WLD enables up toeight channels to be inserted orextracted in the 8 and 16-channelsystem.

l1

VOAVOA VOAVOA

VOAVOA

BB P

TAP

MX

TAP TAP

MXS

LD/T

16

l 8

P

TAP TAP

WLD16

l9

l1 to l8

l9

l16

VOA

B

TAP

MX

TAP

WLT16

VO

A

B B

only one transmission direction shown

SLD/T16

DX

MX

MX

II

VOA

VOA

VOA

SLD

/T16

l9

l16

MX

I

Fig. 3 shows the system architec-ture of TransWave WL. It consistsof network element types WLT,WLP, WLD and WLR. Only onetransmission direction is shown toprovide a better overview.

Optical Line Terminal WLTThe WLT bundles up to 16 opticalSTM-16 signals (from the line ter-minal devices SLD/T) with wave-lengths l1 to l16 to form onewavelength multiplex signal of 40 Gbit/s. This signal is thenoptically amplified.

VOAs enable optical attenuation tobe set individually for each channel(preemphase).

The WDM signal can be measuredduring operation via a TAP coupler(optical splitter).

Optical Line Amplifier WLPThe WLP incorporates a preampli-fier and a booster with elementsinserted in between to influencethe optical transmission character-istics (Inter Stage Device, ISD).

Optical Add/Drop MultiplexerWLDIn principle, the WLD consists ofthe functional elements of the WLT and the WLP. The opticalmultiplexers/demultiplexers havebeen connected in such a way thatup to eight optical signals can beextracted.

Optical Line Amplifier Regenerator WLRThe WLR is designed in the sameway as the WLD. It is used toinsert electrical regenerators forlong distances (in the line terminaldevices SLD/T).

4

System Architecture

Fig. 3 System architecture of the WDM Line System

WLP

B ISD

TAP

P

MX

I

TAP TAP

B

SLR16

SLR16

VO

A

WLR16

l 8 l 8

l1 l1

VOA

VO

A

Pto further WLD,WLR, WLP or WLT

MX

II

DX

II

VO

A

l16

l 9

l16

l 9

B DX

I

5

As an example, Fig. 4 shows theoptical line amplifier regeneratorWLR8 in detail with all the im-portant interfaces.

Control and SupervisingThe controlling network manage-ment system or a craft terminalcommunicate with the SPC com-puter of the OAU-M control mo-dule via the Q interface. In additionto communication (MCF), it alsosupervises all the internal func-tions of the network element(SEMF) and OSC processing.

The optical preamplifier (OP) andthe optical booster (OB) arecontrolled by a microcontroller inthe OAU-M module.

The WDM modules are equippedwith only passive optical compo-nents. The inventory data is storedin an EEPROM.

Alarm and fault messages areoutput as

• visual messages via LEDs(module, subrack),

• Bw7R alarm messages,• messages via the Q interface.

Optical Supervision ChannelOSCFor the management system andcommunication in the optical trans-mission network, a separate opti-cal supervision channel OSC isused. This operates independentlyof the optical preamplifiers/boosters and uses a seperatewavelength. It is used for controlling andsupervising the WDM Line Systemduring operation, for the transmis-sion of engineering order wire callsand user-specific data signals.

Tributary signalsSTM-16,l1…l8

...

l1

C-AL

TIF

OSC OAU-M OSC

OAU-S

AUX Q EOW AUX Bw7R

ls ls

...

...l1

l8

l8

...

...

l1

l1

l8

l8

Optical signals

Electrical signals

SLT16 lineterminatingunit

WDM-DX

SLR16regenerator

WDM-DX

OP

OB

OB

System controller(SEMF, MCF, OSC access)

OP

WDM-MX

WDM-MX

WDM line signall1…l8+lS

WDM line signall1…l8+lS

6

SynchronizationFor the optical supervision channelto operate optimally, clock syn-chronization with the externalclock signal T3 is recommended.The following reference signals aresuitable as clock sources:

• An external 2,048 MHz T3 clocksignal which can be applied tothe synchronization input of aWLT optical line terminal.

• The clock derived from theincoming OSC signal.

• A clock signal from the internalquartz oscillator (free-runningmode).

The priorities of the clock sourcesare defined in the hardware anddepend on the specific networkelement (WLP, WLD, WLR orWLT).

Telemetry Interface Module TIFThe TIF module enables up to 16 telemetry signals to be injectedand extracted for supervisingtasks. These include, for example,messages from the field of objectprotection (such as door contacts).

Fig. 4 Design of an optical line amplifier regenerator WLR8

Q3

SMN-OS

Synchronous Management Network Operations System

EM-OS

Element Management Operations System

AdapterDCN

Q3

F

TELKAT Qx Qx Qx Qx

F F F F

FT-LCTorT-NCT

DCN

Data Communication Network

Data Communication Network

Qx

F

Qx

WLSXC SMA…-1 SL...-1 SR SMA…-2 SL…-2

TransXpress

7

Device and Network Management

The network elements of theWDM Line System can be controlled and supervised witheither a network managementsystem (EM-OS, ENMS, TNMS) ora Local/ Network Craft Terminal T-LCT/NCT (Fig. 5).

The portable T-LCT is used foraddressing individual networkelements and for configuring orsupervision.

The stationary T-NCT allowsmanagement functions to beundertaken easily in compliancewith ITU-T M.3010. Operation isaided by a graphical representationof the network.

Data is transferred from the T-LCT/ NCT to the Q interface ofthe network element via a localarea network and in the opticalnetwork via the DCCo channel.

For network management, thenetwork elements are accessed at

the Q interface. Within the trans-mission network, data is trans-ferred via the data communicationchannel DCCo.

Second generation SDH networkelements incorporate special MCFfunctions for through switchingthe DCC information, as do thedevices in the WDM Line System.For transport networks this is animportant requirement for pathprotection switching of the DCCo.

Fig. 5 Example of device and network management of the WDM Line System

SLT16

System 1 (working)

WLT WLP WLT

... l1

SLT16

l1...

System 2 (protection)

WLT WLP WLT SLT16

l16...

SLT16

... l16

l1...

...

l16

l1

l16

l1

...

l16

l1

l16

l1...

...

l16

l1

l16

l1...

...

l16

l1

l16

...

...

...

...

8

Protection Switching

Because of the high transmissioncapacities of optical systems, it isnecessary in many cases toprovide protection switching.

The protection switching mechanisms of SDH transmissionequipment are then used.

The (1+1) protection switchingalways includes an electricalmultiplex section from electricalterminal device to electrical termi-nal device.

Fig. 6 shows the principle of pro-tection switching via a multiplexsection.

Protection switching takes theform of a (1+1) path protectionswitching via two independentWDM Line Systems. For example,the working path goes throughSystem 1 and the protection pathvia System 2.

The working signal and the protec-tion switching signal are then fed

along separate optical waveguides,i.e. this protective measure alsocovers a break in an optical wave-guide.

Protection switching can also beset up for BSHR configurations inthe same way as shown in theexample.

Fig. 6 (1+1) path protection switching

9

Construction

Fig. 7 Optical Line Terminal WLT16(equippable with max. 1 system)

Fig. 8 Optical Line Amplifier WLP(e. g. equipped with 2 systems)

Subracks

The network elements WLT, WLP,WLR and WLD are constructed ona universal subrack which isequipped accordingly. For 8-chan-nel systems, the subrack can beequipped with two independentWDM Line Systems (e.g. a work-ing and protection device. Thesubracks can also be equippedwith a mixture of modules (e.g.WLD8 and WLP). A separatetelephone handset can be alloca-ted to each system.

For 16-channel systems (Fig. 7 toFig. 10), only the WLP and WLDcan be equipped with twosystems.

For each subrack (for two sy-stems) there is a shared alarm andEOW display (phone) and T3 portfor feeding in the external clock.

Heat is dissipated by free convec-tion (up to max. 50 °C). For highertemperature requirements (up tomax. 55 °C), a fan has to be used.

Viewed from the bottom upwards,each subrack contains:

– slots (single row) for 235 mmhigh modules,

– an alarm panel with EOW dis-play and a connector panel forservice and operating interfaces,

– slots for the 142 mm high TIFinterface module and

– sockets for connecting redun-dant supply voltages.

The plug connectors used are:

– For connecting the LWL cable(on the front of the relevantmodules) LSH plug connectors(E2000/ HRL).

– For multi-pin connections (to theconnector panel on the subrack)plugs according to DIN 41652 (D subminiature).

Racks

The subracks are accommodatedin racks conforming to ETSI. Thepower is supplied via a fuse panelin the rack which also contains thenecessary circuit breakers.

Power supply

The supply voltage can have aduplicated feed to the rack and thesubracks in duplicate.

The OAU and TIF modules have aseparate power supply. It gene-rates the operating voltages usedinternally in the modules from thesupply voltage.

TIF

Bw7R

-48 V/-60 V -48 V/-60 V

PhoneAlarm

WD

M-M

X I

Q1 Q2T3 PBX

EOW

E&M AUX1…3 E&MEOW

PBX

AUX1…3

WD

M-D

X I

QA

U-M

WD

M-M

X II

WD

M-D

X II

TIF

TIF

Bw7R

-48 V/-60 V -48 V/-60 V

PhoneAlarm

Q1 Q2T3 PBX

EOW

E&M AUX1…3 E&MEOW

PBX

AUX1…3

QA

U-M

QA

U-M

QA

U-S

QA

U-S

10

Planning data

(Typical system values regarding STM-16)

Optical waveguide ………………….. single-mode fiber(Standard fiber according to G.652 or Non ZeroDispersion Shifted Fiber according to G.655)

Nominal optical wavelength …………………. 1550 nmOptical waveguides per transmission direction ……. 1Number of channels ….......…………………... 1 to 161)

Repeater section attenuation ………. 18 dB to 40 dB1)

Repeater sections …………………………….. 1 to 141)

Bit error frequency …………………………. ² 1·10-13 1)

1) There is a strong mutual interdependency between these values

Line interfaces

Frequency pattern

8-channel system ……………………………... 200 GHz16-channel system ……………………………. 100 GHz

Input/output signals

Tributary signals ……………………... max. 2.5 Gbit/s1)

1) Prepared for max. 10 Gbit/s

Optical supervision channel OSC

Transmission rate ……………………………… 2 Mbit/sWavelength ……………………………………. 1480 nm

Service and operating interfaces

Network clock synchronization(according to ITU-T G.703)Input port T3in (only WLT) ……………………………. 1Frequency …………………………………….. 2048 kHz

Engineering order wire (EOW)

Call method …………. Selective call or conference callFrequency range …………………... 300 Hz to 3400 HzModulation method ……………………………….. PCMBit rate ………………………………………….. 64 kbit/s4-wire E&M interface: Input/output port per module ………………………. 1/1Interface for handset with keypad or connection (max. 5 m) to other NEs

Fig. 9 Optical Add/Drop Multiplexer WLD16(e. g. equipped with 2 systems)

Fig. 10 Optical Line Amplifier Regenerator WLR16(equippable with max. 1 System)

Technical DataT

IF

Bw7R

-48 V/-60 V -48 V/-60 V

PhoneAlarm

WD

M-M

X

Q1 Q2T3 PBX

EOW

E&M AUX1…3 E&MEOW

PBX

AUX1…3

WD

M-D

X

QA

U-M

WD

M-M

XW

DM

-DX

QA

U-M

WD

M-M

XW

DM

-DX

QA

U-S

WD

M-M

XW

DM

-DX

QA

U-S

TIF

TIF

Bw7R

-48 V/-60 V -48 V/-60 V

PhoneAlarm

WD

M-M

X I

Q1 Q2T3 PBX

EOW

E&M AUX1…3 E&MEOW

PBX

AUX1…3

WD

M-D

X I

QA

U-M

WD

M-M

X II

WD

M-D

X II

WD

M-M

X I

WD

M-D

X I

QA

U-S

WD

M-M

X II

WD

M-D

X II

11

User-specific digital channels (AUX)

(similar to ITU-T V.11)

Input/output port per OAU ………………………. 1/1Bit rate ……………………………………… 1 x 64 kbit/sNumber of available channels ..............……………… 4

Signaling according to Bw7R

Alarm outputs ……………………………... ZA(A), ZA(B)Relay contacts for visual alarm equipment …… a, b, el(1 x for 2 OAU-M)Subrack alarm panel (SRAP) …………1 x for 2 OAU-M(i.e. 1 x per subrack for 2 systems)

External alarms

Input/output ports ………………………………… 16/16Static state conditions forinputs and outputs ……… according to E&M signaling

Network management

Q interface

Type ………………………………... Ethernet, 10 Mbit/sProtocol ……………………………………………….. QxPorts (bidirectional) …………………………………….. 1

F interface

Type …………………………………... RS232, 9.6 kbit/sProtocol ……………………………………………….. Qx

Power supply

Input ports (redundant) ………………………………... 2Input voltage …………………………. –40.5 V to –75 V

Max. power consumption (ignoring external 6-W supply via Qx)WLP ………………………………………………… 67 WWLR, WLD ………………………………………… 68 WWLT ………………………………………………… 45 WFan ………………………………………………….. 30 W

LEDs on the modules (not: WDM-DX, -MX)

Red LED ……………… lights when there is an internal module fault

Green LED ……... operating status indicator (no alarm)

Environmental conditions and dimensions

Climatic conditions

Operating …………………….. ETS 300 019 Class 3.1e- Ambient temperature without fan ………. max. 50°C- Ambient temperature with fan …………... max. 55°CStorage ………………………… ETS 300 019 Class 1.2Transport ………………………. ETS 300 019 Class 2.3

Electromagnetic compatibility

Radio noise field strengthin agreement with ………………. EN 55022, CISPR 22Interference immunity toelectromagnetic factorsin agreement with ……………………. IEC 801-2, -4, -6

and ITU-T K.20/22

Dimensions in mm (WxHxD)

Rack ……………………………………... 600x2200x300subrack for WLT, WLP, WLR, WLD ………………… 450x575x280Installation height for rack(without fan, without VOAs) ……………………….. 600VOA shelf ………………………………… 400x150x230Pitch for rack mount …………………………………250Fan shelf …………………………………. 450x175x275Pitch for rack mount …………………………………250

Subject to change without notice

Ordering No. A30808-X3650-A1-4-7629Printed in the Federal Republic of Germany02991.0

To find out more, please contactICN M MC, Fax:+49 89 722 41072

Copyright © Siemens AG 1998Information and Communication NetworksTransport NetworksHofmannstraße 51, D-81359 München

Siemens Aktiengesellschaft

Abbreviations

SEMF Synchronous Equipment ManagementFunction

SL16 Synchronous Line Equipment for STM-16 Signals

SLR Synchronous Line RegeneratorSLT Synchronous Line Terminal DeviceSMA Synchronous Multiplexer Add/DropSMN-OS Synchronous Management Network

Operations SystemSPC System and Peripheral Board ControllerSR Synchronous RadioSSt InterfaceSTM Synchronous Transport ModuleSXC Synchronous Cross-ConnectTELKAT Interface to the TMNTIF Telemetry InterfaceT-LCT TransXpress Local Craft TerminalT-NCT TransXpress Network Craft TerminalTMN Telecommunication Management

NetworkTNMS Transport Network Management

SystemT3 Input for an External Reference Clock

SignalVOA Variable Optical AttenuatorWDM Wavelength Division MultiplexWDM-DX Wavelenght Division Multiplex -

DemultiplexerWDM-MX Wavelenght Division Multiplex -

MultiplexerWLD Optical Add/drop MultiplexerWLP Optical Line AmplifierWLR Optical Line Amplifier Regenerator WLT Optical Line Terminal WL WDM Line System...-1 Series 1...-2 Series 2

AUX Aiuxiliary ChannelBSHR Bidirectional Self-Healing RingBw7R Narrow-Rack Style 7RC-AL Customer alarmDCC Data Communication ChannelDCCM DCC for Multiplex Section

(STM-16 Signal)DCCR DCC for Regeneration Section

(STM-16 Signal)DCCo Data Communication Channel in the

OSCDCN Data Communication NetworkDCM Dispersion Compensating ModuleEM-OS Equipment Management Operations

SystemENMS Edge Network Management SystemEOW Engineering Order WireE&M Exchange and MultiplexETS(I) European Telecommunication

Standardization (Institute)ITU-T International Telecommunication

Union-Telecommunication Standard-ization Sector

LAN Local Area NetworkLSH Optical Waveguide Plug HLWL Optical WaveguideMCF Message Communications FunctionMSOH Multiplex Section OverheadOAU-M Optical Amplifier Unit MasterOAU-S Optical Amplifier Unit SlaveOB Optical BoosterOSC Optical Supervision ChannelOP Optical PreamplifierPCM Pulse Code ModulationQx Interfaces to the TMNSDH Synchronous Digital Hierarchy