XpressLinkBroadband Access with xDSL technology

s

Fast Internet Access

POTS

ISDN-B

A

digital

LL

High S

peed

IP/Vide

o

Xpres

sLink

SNMP

MainS

treetX

press

46020/

45020

Application

Using XpressLink (XL) in the accessarea expedites the cost-effectiveintroduction and provision of broadband services, such as fastInternet, high-bit-rate data trans-mission and video on demand (VoD)for both residential and businesscustomers. XpressLink is based onasynchronous transfer mode (ATM)technology. ATM provides multi-service signal transmission and flexible, future-proof access to broadband networks. The systemsrevolutionary concept makes itpossible to find economically viablesolutions for a wide range ofapplications.

Providing broadband services pre-viously involved considerable capi-tal expenditure, as laying new lineson the so-called last mile wasrequired. Using XpressLink allowsyou to avoid this cost by utilizingyour existing copper cable infra-structure. At the same time, it allows you access to existing nar-rowband telephone services (POTSand ISDN-BA) over the same cop-per pair. The signals for the narrow-band services are transparentlypassed through by XpressLink.For this purpose, splitters are employed as diplexers on the network and subscriber sides tocombine/separate the narrowbandand broadband signals.

XpressLink is connected via astandardized STM-1/OC-3c, E3/DS3or n x E1/DS1 interface to an ATM core network or a router-basedcore network with ATM interface.The interfaces for accessing the exchanges in the Public SwitchedTelephone Network (PSTN) anddigital data networks are retained.

Subscriber terminal equipment forbroadband services (PC, set-topbox) is either connected externally(via ATMF25, Ethernet-10BaseT or

USB interfaces) or is integrated ina PC via a PC-card (NIC).

XpressLink today provides broad-band services using AsymmetricDigital Subscriber Line (ADSL)technology on existing coppercable networks. Using the DiscreteMultitone (DMT) Modulation, themaximum data transfer rate is contingent upon line length, linequality and potential sources ofinterference. XpressLink automati-cally adapts transmission rates tocurrent conditions by detectingand monitoring parameters duringADSL connection set-up for indivi-dual lines, so that uninterrupted,maximum bandwidth is alwaysavailable. ADSL allows broadbandsignals to be transmitted bidirec-tionally at bit rates of up to 8 Mbit/sto the subscriber (downstream)and 800 kbit/s towards the net-work (upstream). This is achievedby utilizing a frequency band notused for telephony, extending fromabove 30/120 kHz (for POTS/ISDN-BA) up to 1.1 MHz.

A variant of ADSL is G.Lite, alsoknown as UDSL. G.Lite providesmaximum bit rates of 1.5 Mbit/sand 500 kbit/s for downstream andupstream respectively. G.Liteintends to make installation at the

customer side easier by avoidingthe installation of a splitter.

Specialised business applications(like video conferencing, LAN/LANconnections) may require a sym-metric transmission capacity.SDSL can be the solution for theseapplications with a transmissionrate of 2.3 Mbit/s in both upstreamand downstream direction.

The available bit rate can be furtherincreased by employing Very high-bit-rate Digital Subscriber Line(VDSL) technology. VDSL achievesbit rates of up to 12 Mbit/s down-stream and upstream for symme-tric services and up to 26 Mbit/sdownstream and 3.2 Mbit/supstream for asymmetric services.VDSL is still under standardizationin ETSI and will be available in thenear future.

ADSL solutions are ideally suitedto provide broadband servicesboth to residential customers andsmall and medium size businesses.SDSL and VDSL solutions can beused in addition, to better addressthe market for business customerswhere enhanced broadband services are required.

2

System Overview

STM-1/OC

-3c

E3DS3

a/b, Uk

0

PSTN

BB-Co

re

Netwo

rk

Server

Interne

t/

Video

The distances that can be spannedwith ADSL/UDSL, SDSL and VDSLare about 5 km, 3.5 km and 1.5 kmrespectively. With Fiber-to-the-Curb(FTTC) solutions providing opticalfibers nearer to the subscriber, thedistance between the localexchange and the subscriber is vir-tually unlimited. For FTTC theXpressLink DSLAM has to bedeployed nearer to the customerbuildings, e.g. separate from theCentral Office (CO) building.For this outdoor version, a shelteris available.

As subscriber density increases inthe future, it is possible to casca-date DSLAMs to consolidate thetraffic of several DSLAMs, on onecore interface.

Network Operation and Management

The management system of XpressLink is the MainStreetXpress 46020/45020.It is the management solution notonly for XpressLink but also for theSiemens/Newbridge ATM productfamily MainStreetXpress. OtherSNMP based devices like the B-RAS can be integrated in theNMS in conjunction with HP OV.As a consequence, the46020/45020 ensures real ATMend-to-end network managementfor integrated Network Elementsfrom the XpressLink access to theATM backbone (MainStreetXpressproduct family). One NMS for thewhole ATM environment meansthat the costs for installation,training and maintenance of theNMS are minimised.

The XpressLink nodes are confi-gured and administrated on a gra-phical basis using form windows,logical navigation trees, asynchro-nous notification mechanisms andobject listing applications.Management includes configura-tion, alarms, diagnostics and per-formance. The XpressLink DSLAM(XLD) and Network TerminationSoftware can be downloaded andupgraded centrally through the46020/45020.The 46020/45020 isa field-proven and scalable system.

XpressLink offers a Web-basedlocal Craft Terminal (LCT) for fieldmaintenance tasks and small trials,comprising a laptop with WindowsNT and MS Internet Explorer soft-ware. Connection to an XpressLinknode can be local to the node usingits Ethernet interface or remote viaan IP network through Web browsing.

3

Provision of broadband ADSL,G.Lite and SDSL based servi-ces (e.g. Fast Internet, VoD)with simultaneous, transparenttransport of narrowband tele-phone services (POTS or ISDN-BA). Evolution to VDSL on the existing platform using universal slot architecture.

Highly scalable and cascadableplatform with high port densityfor large scale DSL roll-out.

STM-1/OC-3c, E3/DS3,nxE1/DS1 interface to the broadband core network.

Large variety of CPE options:ATMF25, Ethernet (10BaseT)and Universal Serial Bus (USB),PC-NIC and Ethernet router.

Max. bit rate of 8 Mbit/sdownstream and 800 kbit/supstream with ADSL.

Max. bit rate of 1.5 Mbit/sdownstream and 500 kbit/supstream with G.Lite.

Max. bit rates of 2.3 Mbit/ssymmetrically with SDSL.

Max. bit rates of 12 Mbit/sdownstream and upstream(symmetric) or 26 Mbit/s down-stream and 3.2 Mbit/s upstream(asymmetric) with VDSL.

Outdoor solution available. IP access with DSLAM and

Broadband Remote AccessRouter (B-RAS),independently of interfaces to the subscriber.

Network management withMainStreetXpress 46020/45020,full ATM PVC end-to-end man-agement system.

Web-based LCT for field maintenance tasks.

Main Features of the XL system

XpressLink employs the Asym-metric Digital Subscriber Linetechnology from TI. The trans-mittable payload data rate withADSL is dependent on line length.

Measurements on XpressLink, seealso graphic on right, confirmexcellent performance in terms ofboth maximum bit rate and reach:

Bit rates of up to 8 Mbit/stowards the subscriber (down-stream) and up to 800 kbit/stowards the network (upstream)

4

up to 3.0 km

Fast Internetor VOD

Superfast Internet+

Broadcast TV

4 Mbit/sdownstream384 kbit/supstream 2 Mbit/s

downstream160 or192 kbit/supstream

8 Mbit/sdownstream800 kbit/supstream

up to 2.5 km up to 4.0 km up to 5.0 km

6 Mbit/sdownstream640 kbit/supstream

Data Rates with ADSL as a Function of Line Length

1 432

1,000

0

3,000

5,000

8,000

7,000

6,000

4,000

2,000

Dat

a R

ate

(kbi

t/s)

Loop #

dsus

Loop #1

Loop #5

Loop #4

Loop #3

Loop #2

=2.2 km

=3.23 km

=2.7 km

=2.5 km

=2.5 km

0.8 km 1.4 km

0.7 km 1.8 km

1.0 km 1.5 km

2.0 km 0.7 km

3.23 km

0.32 mm PE 0.4 mm PE

0.4 mm PE

0.32 mm PE 0.4 mm PE

0.32 mm PE 0.4 mm PE

0.32 mm PE 0.4 mm PE

5

ADSL Technology

Range > 5 km at 1 Mbit/sdownstream and 64 kbit/supstream

High performance margins guarantee high transmissionreliability and the availability ofthe required bandwidth.

Interoperability

Siemens and TI are members inthe ADSL Forum and UAWG stan-dardization group. Siemens hasproved via extensive interoperabilitytesting, that its xDSL access plat-form, XpressLink, is compatible toxDSL systems of the other majorxDSL system suppliers. Besidestesting under the co-ordination ofthe ADSL Forum and UAWG,Siemens has successfully provedinteroperability in their ADSL com-petence center. Interoperability refers to the ADSL, ATM andapplication layer between DSLAMand CPE. Interoperability of xDSLequipment means flexibility foroperators and customers. It is acondition for xDSL mass-marketdeployment.

Discrete Multitone Modulation

The ADSL technology fromSiemens / TI employs DiscreteMultitone (DMT) modulation. ForADSL signal transmission, thistechnique uses a frequency rangeabove 30/120 kHz (POTS/ISDN-BA)up to 1.104 MHz.The entire frequen-cy range is divided into several

discrete carrier frequencies. Eachcarrier frequency (upstream anddownstream) is assigned a band-width of 4.3125 kHz.

The usability of the individual,resultant frequency channels is determined by line parameters(e.g. attenuation) or any interferencesources present. Interference-freechannels are assigned with themaximum bit rate. If frequencychannels are degraded by interferingsignals or raised line attenuation,the bit rate is then automaticallyadjusted. If a frequency channel isseverely degraded, e.g. due to RFinterference, the channel isignored until signal transmissionconditions are improved.

ADSL over POTS versus ADSL over ISDN

For POTS service, FDM with sepa-rate bands for up- and downstreamtraffic is deployed to obtain maximum interoperability withother CPE vendors worldwide.Echo cancellation improves theADSL performance.

As ISDN service needs morebandwidth than POTS (120 kHzversus 3.4 kHz) the available band-width for ADSL transmission isless than for POTS. The integratedasymmetric echo canceller allowsthe upstream and downstreamchannels to overlap. The advantageis that the low frequency rangewhich is particularly suitable forsignal transmission is available forboth the downstream and upstreamdirection. This allows ADSL overISDN to have a similar performancethan ADSL over POTS.

5

30 kHzFrequency

Downstreamchannel

POTS

Upstreamchannel

ADSL

Assignment of the Frequency Range for ADSL over POTS

Frequency Frequency Frequency

Bits/channelBits/channel

HF 151413121110987654321

151413121110987654321

151413121110987654321

Signal power

Cross-talk

Main ADSL Features

Conforms to ANSI StandardT1.413 Issue 2 and ITU G.Dmt.(G.992.1)

DMT-based FDM for ADSL with POTS

and frequency overlap for ADSL with ISDN

Echo cancellation for ISDN andPOTS

Reed-Solomon forward errorcorrection

Wei-4D-Trellis coding Multiport architecture Automatic bit rate adaptation Bit rates of

8 Mbit/s downstream and 800 kbit/s upstream over a distance of 2.5 km

TI software.

Automatic Bit Rate Adaption to Interference for Copper Pair with Attenuation, RF Interference and Cross-talk

IP

ATMSTM-1

City, high density

Suburb, medium density

Country, low density

DSLAM

DSLAM

DSLAM

SDHE1, n x E1

SDHe.g. E3

Splitter NT

MainStreetXpress46020/45020

ATMAccess

B-RAS

InterXpressSSS

ADSL or SDSL

ADSL or G.lite

ADSL over

ISDN

ADSL over POTS

The standardized interfaces andmodular design of XpressLink makeit ideally suited for cost-effectiveexpansion of existing narrowbandnetworks because it allows shareduse of the established infrastructureto provide broadband services viaxDSL. This applies to the coppercables in the subscriber loopthrough to the existing PDH/SDHtransport systems for accessingthe core network.

The system components ofXpressLink comprise the customerpremises equipment (CPE) and theDSLAM. To fit flexibly into existingnetworks and to be able to adaptto future requirements and changes, the system architectureof XpressLink pursues and unifiesseveral key points:

A set of different FeederInterfaces for an optimised useof network capacity

Evolutionary xDSL technologywhich offers a complete range ofsymmetrical and non-symmetricalDSL services

A universal slot concept whichprovides maximum flexibilty forthe configuration of theXpressLink DSLAM

Cascadability of XpressLinkDSLAMs for cost effective usage of network infrastructure

Complementary technology (B-RAS and SSS) to offerIP functionality and services

Evolutionary xDSL Technology

G.Lite is a variant of ADSL. Thepurpose of this technology is tosimplify installation at the subscri-ber premises on the basis of theexisting cabling at the location. Itis not possible however to combineG.Lite with ISDN. Moreover, it pro-vides significantly lower bit rates

6

Optimized network architecture with 3 level DSLAM cascadation

System Architecture

The XpressLink DSLAM operatesas a multiplexer, which consoli-dates the traffic originating from a number of subscriber linesto a single feeder interface towardsthe ATM network.

The feeder interfaces employ established transmission technolo-gies (PDH, SDH) with bit ratesstarting at nxE1, nxDS1 (n=1...8),E3, DS3, and up to STM-1 or OC-3c.

than ADSL. Since the basic tech-nologies for ADSL and G.Lite arevery similar, XpressLink uses thesame HW technology for ASDLand G.Lite and integrates bothDSL solutions in one SW.

XpressLink provides SDSL andVDSL as an evolutionary path fromADSL architecture. It can thus pro-vide subscribers with symmetricand asymmetric high bandwidthservices. With symmetric 2.3 Mbit/s,SDSL supports business applica-tions which require symmetrictransmission rates on a similarlevel to 2 Mbit/s leased lines.SDSL provides transmission for alength of up to 3.5 km.

VDSL facilitates enhanced videoapplications and high bit rate dataservices. Symmetric bit rates of up to 12 Mbit/s (up to 500 m) and asymmetric bit rates of up to 26/3.2 Mbit/s (up to 1.5 km)are possible. Because VDSL has ashorter range, the DSLAMs aretypically located closer to thesubscriber within an FTTC/FTTBarchitecture.

Universal Slot Concept

Thanks to its evaluative designbased on the xDSL universal slotconcept, the XpressLink platformcan be easily reconfigured orupgraded with new features andadditional xDSL interfaces.

An ATM cell bus architecture,which provides 1 Gb/s capacity forup- and downstream traffic, avoidsany kind of bottlenecks within theATM path, and ensures a futureproof DSLAM platform.

Cascadation of DSLAMs

A continuous evolution towardsADSL mass market and high penetration rate of BB serviceswill necessitate a differentiation of ADSL nodes: small nodes in remote areas andlarge nodes in densely populatedareas. By this time, XpressLink willhave available boards to cascadesmall remote DSLAMs towards a single DSLAM in the centrallocation.

Using nxE1/DS1 interfaces, remotelocations can be connected veryefficiently using already existingSDH transport infrastructure. Thecollecting DSLAM on the highernetwork level collects the remoteDSLAMs via the nxE1/DS1 interface.Two nxE1 interfaces will be availa-ble on one nxE1 cascading board.

For large central office applicationsthe DSLAMs can be connectedlocally to provide a high degree oftraffic concentration onto oneSTM-1 core interface.

In the future, E3 and STM-1 linkswill be available as a cascadationinterface to enlarge the overallsystem capacity.

Higher Layer (IP) solutions

One part of the future proof andevolutionary concept is theBroadband Remote Access Server(B-RAS). As an integral part of thecomplete Siemens product portfo-lio for IP over ATM, XLD not onlyoffers xDSL solutions, but providesthe means to build an end-to-endbroadband network with all thecapabilities to support IP basedservices with the multi serviceclass and Quality of Service fea-tures inherent to an ATM transportplatform.

In addition, using the higher layeraccess and subscriber manage-ment of a Service Selection Server(SSS) the carrier is able to offerwholesale access products andservices providing a single andpersonalized page, a so called "por-tal page. The service selection is asubscriber-initiated operation andis fully automated for the carrier.

Customer Premises Side(Residential and Business)

On the customer premises side a complete family of DSL modemsis available. The least costlymodems are the PCI NIC cards,which are installed directly in a PC,and the USB modems that are linked to the PC by a standardUSB interface. XpressLink suppliesan ADSL router for business users,who need a modem with exten-ded routing capabilities, e.g. for aLAN-WAN connection. The modemfamily is completed by theNetwork Termination (NT) withEthernet 10BaseT or/and ATM25interface. The NT is managed andcontrolled centrally by the xDSLoperator through the XpressLinkmanagement system46020/45020, thus providing the capability to fully control the whole ADSL network.

The narrowband signals for POTSand ISDN-BA are passed throughby XpressLink transparently.Splitters are employed for this purpose at the subscriber and onthe network side. The function ofthese splitters is to separate orcombine narrowband signals andbroadband signals.

7

8End-to-End Solutions

Subscribe

r

Local E

xchange

Cor

e Networ

k

Host

DSLAM

MSX

36190/361

70

Access Swi

tch

MSX 36140

ATMF 25.

6 Mbit/s

PC with N

IC

Internet

NT

NT

Video

Server

Virtual

Corporate

Network

ATM over ADSL

ATM over AD

SL

ATM

over

ADSL

Ethernet

10BT

B-RAS

SSS

XpressLink is used to provide end-to-end network solutions for newbroadband services. The key tosuccessful deployment of xDSL isend-to-end compatibility of allcommunication layers, i.e. both forthe existing infrastructure (Frame-Relay-based Internet, InternetService Provider POPs, etc.) andfor new broadband systems fromdifferent vendors.

The system architecture for ourend-to-end solutions is based onexisting standards, in particular thePoint-to-Point Protocol (PPP) overATM and the PPP over Ethernet(PPPoE). This ensures that thesystem can be implemented rapidlyand provides the following impor-tant service requirements:

Access to Internet, corporatenetworks, local content serversand peer-to-peer communication

Simple migration of existing ISPinfrastructures to IP over ATMbased end-to-end networks

Integration of new broadbandservices on existing IP serviceplatforms

Flexible transport platformbased on ATM

Supports multicast service Supports various traffic classes

(CBR, UBR, VBR)

Quality of Service (QoS).XpressLink is based onATM transmission overADSL, permittingPermanent VirtualConnections (PVC) andbeing transparent forSwitched VirtualConnections (SVC).

The End-to-End Solution with XpressLink for IP over ATM

The XpressLink access networksolution is fully integrated in thesuperordinate IP over ATM networkarchitecture. The superordinatenetwork architecture also includesthe Siemens/Newbridge productfamily, MainStreetXpress (MSX) inthe core network area. This inte-gration allows diverse services tobe provided, e.g. switched virtualconnections to Internet/ISP, and thecreation of Virtual Private Networks(VPN) with various QoS options.

XpressLink can be connected tothe ATM core network via the ATMAccess Switch. The Access Switchalso allows flexible traffic concen-tration and routing, e.g. accordingto subscriber type (residential,business customer) and the servicerequired by the subscriber. A busi-ness customer accessing VPNapplications can be connectedthroughout the network. The resultis a peer-to-peer connection withguaranteed QoS.

An end-to-end IP session is realizedwith the Point-to-Point Protocol.A Broadband Remote AccessServer (B-RAS) is employed inSiemens network architecture exactly for this purpose.The B-RAScan be connected both to the ATMconcentrator and to the switch inthe core network.

Among other functions, the B-RASprovides subscribers with accessto Internet Service Providers (ISPs)or to corporate LANs. Theseconnections are set up using thePPP dynamic address assignmentor permanent IP address assign-ment functionality. The B-RAS pro-vides the PPP functionality, e.g.authentication and supervision ofthe PPP session. The graphicbelow represents this networkconfiguration.

Other configurations are also pos-sible. For example, the B-RAS canbe connected to the switch in theATM core network or be interpo-sed between the DSLAM andATM core networks.

End-to-end Network Configuration for IP over ATM over ADSL

In its efforts to provide a customi-zable broadband access platform,Siemens has developed a softwaresolution, called the Service Se-lection Server (SSS). Using thissolution, the Internet user reachesa remote access server (for exam-ple via dialing in). The personalizedservice selection page (Portal) isdownloaded from the SSS to theusers standard Web browser. Byclicking on the respective icon inthe portal page the user selectsISPs and/or service/content provid-ers. Accounting is then started forthe service selected, enabling theIP access carrier to collect units ofusage for later billing purposes.Billing is possible on a per-service,per-usage (time/volume), per-databasis.

PPP over Ethernet

Regarding the XpressLink EthernetNT, bridging is supported by beingtransparent to the PPPoE protocol.Support of RFC1483 allows theassignment of an IP address tothe user PC through DHCP. In thisscenario, the DHCP server can bethe B-RAS or a separate server,e.g. located at the ISP. The graphicon the right is an example of aPPP over Ethernet network archi-tecture.

9

ADSL/UDSL/VDSL/SDSL

ServerATM

FrameRelay

ISPLocalExchange

ATM25

STM-1/E3PC

PHYATM

PHYATMATM

PHYATMAAL5PPPIP

PHYATM

ADSL PHYADSLATM

PHYPHY

ATM/FRATM

AAL5PPP

IP

PHYPHY

ATM/FR

IP

AccessSwitch

B-RAS

DSLAM

NT

PSTN

ATM/FR

POTS

ATM

Internet

e.g. T-Onlineor AOL

802.3

STM-1/E3PC

PHYATMATMATM

PHYMAC

PPPoEIP

PHY ADSL PHYADSLATM

PHYPHYATMAAL5

PPPoEIP

PHYPHY

IP

B-RAS

DSLAM

NT

ATM/802,3/

FRMAC ATMAAL5

ATMAAL5

ATMAAL5

Server

Server

POTS

ISP1+ Radius

ISPn+ Radius

LocalExchange

PSTN

ADSL/UDSL/VDSL/SDSL

Network Topology for PPP over Ethernet dial-in to B-RAS

PPP over ATM

Through this method, the PPP ses-sion is terminated in the BB-RAS.IP packets are extracted from thePPP and forwarded via an IP-basedbroadband core network (FR, ATM)to the addressed ISP or corporate

LAN. The graphic below is an over-view of the network architectureand the data processing at protocollevel. PPP over ATM is a solutionmainly for residential subscribers.It is applicable for any ATM basedNTs, USB modems and NICs.

Network Topology for PPP over ATM dial-in to B-RAS

The DSLAM terminates the sub-scriber loop network. Its Line Unitprovides the option of an optical orelectrical interface STM-1/OC3(155 Mbit/s), an electrical E3/DS3(34 Mbit/s / 44 Mbit/s ) interfaceor a nxE1/DS1 IMA (n x 2 Mbit/s /n x 1.5 Mbit/s, n = 1 ... 8) interfaceto the BB core network. A connec-tion to an ATM Access Switch isalso possible.

Because the DSLAM can beequipped with different units on amodular basis, it is possible to fle-xibly implement diverse networkrequirements with a minimuminvestment of capital.

The DSLAM provides the followingATM functions:

Cross-connectionTranslation of the Virtual Path and Virtual Channel Identifiers(VPI/VCI) between the BB signalon the core network side andthe xDSL signal on the CPE side.Permanent Virtual Connections(PVCs) are set up according to the cross-connections established.

VP MultiplexingMultiplexing the individual ATM

cells on the xDSL lines into anATM signal to the ATM/SDHcore network, and demultiplexingthem in the opposite direction.All the VCs belonging to the pathare passed through transparently.Signaling is passed throughtransparently in accordance withthe virtual UNI definition.

VC MultiplexingAlternatively, the XpressLink canalso be configured as a VC cross-connect.This reduces the numberof VPs in the direction of theATM switch. Owing to the virtualUNI definition, this is only possible for PVCs.

Traffic ManagementServices of traffic classes CBR,VBR-rt, VBR-nrt and UBR can betransmitted simultaneously, UBRservices being processed on alower priority basis.

The central processor is part ofthe CU (Central Unit). The LU pro-vides the interface to the core net-work via a standard ATM interface.The SU_AD16 offers 16 ADSL orG.Lite drop interfaces to the sub-scribers. There is no HW or SWdifference between ADSL and

G.Lite. One DSLAM can serve upto 224 ADSL (G.dmt or G.Lite)subscribers, each line card carries16 ports. There are different line cards for SDSL and VDSL(SU_SD16 and SU_VD24).To ensureoptimum usage of the networkinfrastructure, the SU_nxE1/DS1interface enables the operator tocascade several 224 subscriberDSLAMs to one single uplink (inthe future, cascadation will be alsosupported with STM-1/E3 interfa-ce). Two cascadation nxE1 interfa-ces are available on one cascadati-on interface board.

In addition, the DSLAM has anEthernet interface for connectionof an LCT or the MainStreetXpress46020/45020 for the operation,administration and maintenance ofall XpressLink components.Remote network elements can beconnected to a MainStreetXpress46020/45020 via inband manage-ment.

Splitter Units (POSU) combine thexDSL signals and the narrowbandsignals for common transmissionto the subscriber and split the signals for transmission to therelevant core network. Since thesplitters are purely passive devices,the availability of the narrowbandservices is not affected by anydisturbances occurring in the broad-band system. The splitter boardsare located in a separate subrackfor high flexibility and packagingdensity. One splitter module serves16 POTS or ISDN lines. The splittersubrack can be co-located in theDSLAM rack, or remotely in sepa-rate racks.

Each DSLAM system consists of 2 subracks:

Basic subrack for CU, LU andSU_ADSL, SU_VDSL SU_SDSLand SU_nxE1.

Subracks for the passive splitterunits.

10

Digital Subscriber Line Access Multiplexer(DSLAM)

Copper

ADSLUDSLSDSLVDSL

SUAD

POSU CU LU

SUVD

Splittersubrack Basic subrack

cascadedDSLAM

SUSD

SU_n x E1

BB-Core

Network

PSTNa/b, Uk0

STM-1/OC-3cE3

DS3n x E1/DS1

The concept of seperate basicsubracks and splitter subracks allows cost optimized single rackarchitectures to be extended toaccommodate more subscribersat any time through cascadation.From the XpressLink NMS point ofview, each basic rack cascadedor not is one single network element.

Only the slot adress of the CU undLU units are fixed. Due to the uni-versal slot concept, it is possibleto use any other slot of the basicsubrack for the operation of eitherADSL, G.Lite, SDSL or VDSL appli-cations in the DSLAM or to installan SU_nxE1.

The lower part of the basic subrack supports all the boardsand the upper part contains thewire interfaces and the externalpowering voltage.Each rack contains a terminalpanel with fuse panel and anoptional clock distributor supplyingan external clock signal T3.

The DSLAM design has a decen-tralized power supply, all necessaryelectronic voltages are generatedwith on-board DC/DC converters.This allows a flexible and modulardesign. The DC input voltage isnominal 48 V / 60 V; onboardDC converters input voltages ran-ging from 38 V to 75 V).

The racks can also be equippedwith rear panels and doors to pre-vent unauthorized access. Allexternal electrical DSLAM interfa-ces are accessible from the frontvia the connector panel.

For FTTC applications, the racksare installed in weatherproofenclosures. These are fed from thepublic power supply network andare equipped with backup batte-ries.

11

SU_A

D16

SU_A

D16

SU_A

D16

SU_A

D16

SU_A

D16

SU_A

D16

LU CUSU

_nxE

1SU

_AD1

6SU

_AD1

6SU

_AD1

6SU

_AD1

6SU

_AD1

6SU

_AD1

6SU

_AD1

6

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Splitt

erSp

litter

Splitt

erSp

litter

Splitt

erSp

litter

Splitt

erSp

litter

Splitt

erSp

litter

Splitt

erSp

litter

Splitt

erSp

litter

0 1 2 3 4 5 6 7 8 9 10 11 12 13

Configuration of the basic subrack for All-ADSL and SU_nxE1 for cascadation

Splitter Subrack with 224 (16 x 14) splitters

From 1 to 2 cascadedDSLAM

To ATM backbone orcascading DSLAM

Basic subrack with ADSL line cards

To economically and flexibly pro-vide high bandwidths on demand,Network Terminations (NTs) offerstandardized interfaces that expe-dite the connection of terminalequipment (PC or STB). Thesecover the entire range of residentialand business customer applications(SOHO, SME).

The NTs are fed via an integratedAC adapter plug from the publicpower supply network (110 V or230 V).

The NT is housed in a compactplastic case for convenient wallmounting or desktop use. It is tobe installed directly on residentialor business customer premises.

There are different variants withATMF 25.6 Mbit/s interfaces and/orEthernet-10BaseT interface. In thedirection of the DSLAM, an ADSLinterface is implemented.

The difference between a NT andother CPEs (USB, PC-NIC, etc.) isthat the NTs are capable of being completely managed by the Management System 46020/45020.Management includes SW down-

load and upgrade, configurationmanagement, self test monitoring,fault and performance management.Communication to the ManagementSystem is carried by an inbandATM management channel(default PVC).

A separate splitter preceding theNT allows broadband and narrow-band services (POTS or ISDN-BA)to be used simultaneously.The twotypes of services are transmittedbetween the NT and DSLAM via acommon line.

12

to DSLAMCopper

DSLNT

STBTV

PC

and/or

STB+TV

POTSor

ISDN-BA

Splitter

Phonejack

Customer Premises Equipment (CPE) Family (I) Network Termination and Splitter

NT with Ethernet-10BaseT

For those service users who arestill operating subscriber terminalswith Ethernet interfaces this NT isthe right choice. The interface con-forms with the Ethernet Standard.The interface to the DSLAM is an ADSL interface.The Ethernet NTsupports three different modes:self-learning bridge, static router orPPP forwarding through PPTP tunnel.

NT with Ethernet-10BaseT and ATMF-25.6-Mbit/s Interfaces

If customers need to have the fle-xibility to use either Ethernet orATM interface, XpressLink offersthe so-called Twin NT. This NT con-tains both an ATMF 25.6-Mbit/sinterface, and an Ethernet-10BaseT.The two interfaces can be operatedat the same time.

Splitters

Splitter Units are installed at thecustomers premises if both broad-band and narrowband services(POTS or ISDN-BA) are required.

The splitter is a purely passive de-vice, that separates and combinesnarrowband and broadband signals.The splitter can be used toconnect terminal equipment forPOTS or ISDN-BA.

It is housed in its own compactplastic case for either wall mountingor desktop use.

13

NT with ATMF-25.6-Mbit/s Interface

This NT is used to realize ATMend-to-end or ATTH solutions. Theinterface to the subscriber terminalequipment conforms to the ATMForum standard. It can be con-nected to a PC for data applicationsor to a Set-top box for video appli-cations.

The NT converts the signals bet-ween the ATMF 25.6-Mbit/s inter-face and the ADSL interface.

Network Interface Cards (NICs)can be installed in any PeripheralComponent Interconnect (PCI) busslot within a PC. PCI bus slots areavailable on most Pentium-baseddesktop PCs. Siemens offers threetypes:

the 25-Mbit/s ATM adapter, theATM-ADSL and the ATM-G.Liteadapter.

25-Mbit/s ATM Adapter

This card is a very cost effectiveATMF 25.6-Mbit/s interface, idealfor all kinds of ATM- and IP-basedapplications. Preconfiguration andproven interoperability simplifyinstallation and ensure widespreaddeployments. The adapter card canbe operated under Windows 95/98and Windows NT.

ATM-ADSL and G.Lite Adapter

The ATM-ADSL and the G.Lite-ATM adapters are an alternative tousing Network Terminations forstandalone PC applications. In thiscase, the DSL subscriber line isconnected directly to the PC. Allthe ATM and DSL functions areprovided by the adapter and by dri-ver software installed on the PC.The main features of this card are:

Network access via ATM overADSL or G.Lite

industry standard DMT ADSL atup to 8 Mbit/s or G.Lite at up to1.5 Mbit/s downstream.

Seamless operation underWindows 95/98 and WindowsNT

Installation and Configuration

The hardware is quick and easy toinstall without having to set jum-pers or DIP switches. Installationof the software is just as simple.

Easy and error-free installati-on minimizes requests tothe network operator forsupport.

The ADSL and G.Lite adap-ter will be delivered to the custo-mer with a driver SW. The SW con-tains all the necessary preconfigu-rations. As a result, the DSL sub-scriber has the advantage of asimple plug-and-play solution.

14

NT

PC

Subscriber line

ADSL/SDSL/VDSL

25-Mbit/s-ATM Adapter

PC

Subscriber line

ADSL/UDSL

ATM-ADSL Adapter

PC-Configuration with ATM-ADSL Adapter or ATM-UDSL Adapter

PC-Configuration with 25-Mbit/s-ATM Adapter

Customer Premises Equipment Family (II) Network Interface Cards

Network Interface Card (NIC)

USB modems

Similarly to the PC integratedADSL and G.Lite adapters theUSB modems provide low costsolutions for ADSL and G.Litedeployment. Connection to the PCis provided through a UniversalSerial Bus (USB) port, available onmost desktop PCs sold from mid1997. The USB modem can alsoprovide remote network access fora workgroup or a small businessby attaching it to a PC based onWindows 95/98 or Windows NT.

DSL router

Some cases of application mightrequire deep routing capabilities,concentrated at the customer pre-mises side. When a businesscustomer wants to connect seve-ral subscribers over a router to aWAN network, this modem is theright choice. The DSL router sup-ports the common features likePAP, CHAP, TCPIIP, RIP1, RIP2, etc.

The external DSL router provideshigh speed remote networkconnections for one or moreEthernet-attached PCs, worksta-tions or other networked devices.The router sends and receivesATM cells over standard phonelines, using DMT digital subscriberline (DSL) transmission.Connection to local computers isprovided through a 10BaseTEthernet port.

Software-based installation and configuration (USB)

Because a standard USB port isemployed, installation of an adap-ter card inside the PC is avoided.Therefore, installation is eveneasier than for NIC cards.Configuration is the same forADSL and G.Lite PC. There is noHW difference between a G.Liteand an ADSL modem. For ADSL asplitter is required additionally toseparate the broadband signalfrom the voice signal at the CPEside.

Installation and configuration(router)

Setting up the router is no pro-blem. Advanced routing featureslike Network Address PortTranslation and complete DHCPand DNS functions enable all LANworkstations to access theInternet without requiring reconfi-guration.

The ADSL router has a serial RS232 port for local management.The router is managed through anintuitive Web-based graphical userinterface.

Future proof CPE concept

Siemens XpressLink comprises acomplete suite of modems ascustomer premises equipment.For future applications Siemenswill offer further types of modems.As voice and data services growtogether more and more, amodem will be available concen-trating up to 16 voice ports andone Ethernet interface on oneATM-over-ADSL line towards theDSLAM. On the CO side a voicegateway transforms the voice overATM signal into the appropriatenarrowband signal to transmit it tothe voice switch. For users whodo not want to install new homewiring when on the high-speeddata highway, an NT with wirelessaccess will be the answer in thefuture.

15

USB modems DSL router

USB Modem or DSL Router

The XpressLink system is seamlessly integrated in theMainStreetXpress NetworkManagement suite, based on the46020 Network Manager and45020 Element Manager.

With one single platform thewhole communication chain fromADSL access to the ATM core canbe managed. This is the most costeffective and powerful solution forBroadband TMN.

Features

Graphical network display downto the board level

Comprehensive configurationmanagement

ATM end-to-end path management

Detailed fault management Loopback tests for fault location Sophisticated performance

management on physical andATM layer

Software management, inclu-ding centralized software upda-te, backup and restore functions

Inband connection of theElement Manager to theXpress-Link system. Localconnection via Ethernet (out-band) also possible

Q3 interface for access to ahigher layer service manage-ment system

Local Craft Terminal (LCT) availa-ble, running under Windows NTwith a Web-browser

16

Network Operation andManagement

Screenshots of the XpressLink Management System 46020/45020

OA&M Headquarter

Q3

46020

45020

XL ApplicationB-RAS Application

Data Communication Network(DCN)

HPOV

XL

XL

XL

ATM network

IP network

36140

36170

36170

36190

B-RAS

LAN

LAN/Router

LAN/Router

Router

NMS end-to-end solution

The figure shows an example ofthe Siemens NMS architecture.The XpressLink system, the B-RAS, the 36140 and the ATMbackbone switches 36170 and36190 form an ATM network. Thisvariety of nodes can be managedthrough one single managementsystem - the MainStreetXpress46020/45020. XpressLink applica-tion (Descriptor) runs on the 45020runtime server. It is connected tothe 46020 Network Manager. The46020 abstracts the different tech-nologies (SNMP, Q3) to a conden-sed technology independent

can be managed by one elementmanager. Small networks needonly one 45020 server that runs ona HP OV server.

Local Craft Terminal (LCT)

For maintenance tasks there is anLCT available, which is connecteddirectly to the network elementsor remotely via an IP network. TheLCT offers a portable solution forcustomer service personnel. Itmay start, configure, monitor anddiagnose an XpressLink node.

17

model. The B-RAS is an exampleof how to integrate SNMP baseddevices into the 46020 via HP OV.The 46020 also offers a standardQ3 interface to higher layer (ser-vice management) managementsystems.

The architecture of the 46020/45020 is very flexible. The hard-ware configuration can be expan-ded in various stages, startingwith a single workstation throughto a distributed client / serverarchitecture so that up to 30.000subscribers and a correspondingnumber of XLD network elements

Example of NMS architecture for XpressLink, B-RAS and Siemens ATM backbone

System quality and reliability ofSiemens products is assuredthrough development and produc-tion processes ISO 9001 certifiedand supported by global servicelogistics.

Planning/Project Management

Siemens project engineers estab-lish project plans, work out thedetails of the project to be imple-mented in consultation with theoperating company and produce aproject implementation schedule.This includes all the activities in-volved, ranging from ordering hard-ware and providing software, aswell as organizing delivery, installa-tion and commissioning, throughto providing the database and thedocumentation.

In addition, Siemens provides support for construction planning,network planning and in creatingoperator concepts.

Installation

Separate documentation is provi-ded for installation (InstallationManual IMN), describing step-by-step the process of installing thesystem components.

After a suitable training period anda limited period of transitional sup-port, local personnel are able totake over the work of installationthemselves.

Commissioning

The contracted telecommunicati-ons equipment is commissionedaccording to the manuals and pre-pared for acceptance. Commissi-oning includes for example loadingthe application program, installingthe database and performing off-line functionality tests. At the endof Commissioning, the system isready for Acceptance. Commissi-oning includes basic network inte-gration; complete network integra-tion is available separately in theservice Network Integration.

Acceptance

If required, acceptance of thesystem can be carried out with theoperating company on a ready foracceptance (RFA) basis before thesystem enters service. This usuallycomprises a visual inspection of allthe equipment as well as ademonstration of the hardwareand software functions.

The scope of the acceptancetesting is agreed contractually with the operating company on an individual basis.

Network Integration

This involves linking the systeminto an existing network as well asloading the database. The finaltests are then performed to verifyinternetwork functionality.

Documentation

The operator documentation forWN products is classified accor-ding to tasks and target groups. Alldocuments covering the descripti-on (User Manual UMN, TechnicalDescription TED, Subsystem Des-cription SSD), installation (Instal-lation Manual IMN) and mainten-ance of the system (MaintenanceManual MMN) are structured fromthe top down. Introductions to thesystem and network begin bydescribing the top level, then pro-gressively deepen the readersknowledge down to the functionallevels. Sub-dividing the operatordocumentation in this way optimi-zes system operation and facili-tates fault elimination. At the sametime, the documentation can bebroken down into handy sizedmanuals for each task.

Apart from the standard hard copy,the documentation can also besupplied in electronic form.The files can then be down-loadede.g. to the workstations of theoperations systems, thus providingsignificant benefits in speed andease of handling.

TrainingFor the personnel of the operatingcompany, the Siemens TrainingCenter for Communication Systemsprovides training programs compri-sing various courses oriented totarget groups, i.e. tailored to thedifferent activities of the variouspersonnel. The course require-ments, contents and objectivesare precisely laid down for each ofthe target groups. The training isgiven:

In the Classroom At work Computer-based.Courses can be adapted to suitthe specific requirements of theoperating company on an individual basis.

Technical Service CenterThe Technical Services are servicecenters located in the operatorsorganization, in the regional agen-cies and at the Service depart-ment for Communication Net-works in Munich. Their main taskis to provide technical support toensure continuous system andservice availability including:

Emergency Service On-Call Support Fault Report Processing Software/Hardware Update Field Service Repair and Replacement Service Bulletin Board Basic Software Upgrade For more information aboutSiemens professional services see brochure Customer Success,Order No. A50001-N12-P5-2-7600.

18

Siemens Allround Support

19

ADSL specifications

Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . DMTStandard . . . . . . . . . . . . . . . . . . ANSI T1.413 Issue 2,

Cat. 1 (Frequency Division Multiplex) for POTS,Cat. 2 (Frequency Overlap) for ISDN,

Echo cancellation for POTS and ISDNETSI ETR 328 and ITU G.992.1

Min. Downstr. bitrate . . . . . . . . . . . . . . . . . 32 kbit/sMin. Upstr. birate . . . . . . . . . . . . . . . . . . . . 32 kbit/sDownstream bitrate . . . . . . . . . . . . up to 8,16 Mbit/sUpstream bitrate . . . . . . . . . . . . . . . up to 800 kbit/sRate adaption . . . . . . . . . . . . . . . . . . . 32 kbit/s stepMax. Distance . . . . . . . . . . . . . . . . . . . . about 5 Km

Passive SplitterLine functions:

ISDN: (2B1Q and 4B3T)POTS: (2wire a/b): Metering tone (12 /16 kHz) and different line impedances (real or complex)

UDSL specifications

Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . DMTStandard . . Implemented according to ITU-T G.992.2

and G.lite standard of UAWGMin. Downstr. bitrate . . . . . . . . . . . . . . . . . 32 kbit/sMin. Upstr. birate . . . . . . . . . . . . . . . . . . . . 32 kbit/sDownstream bitrate . . . . . . . . . . . up to 1,536 Mbit/sUpstream bitrate . . . . . . . . . . . . . . . up to 512 kbit/sRate adaption . . . . . . . . . . . . . . . . . . . 32 kbit/s stepMax. Distance . . . . . . . . . . . . . . . . . . . . about 5 Km

Other xDSL interfaces

SDSLTransmission rate for SDSL: Symmetric . . . . . . . . . . . . . . . . . . . .up to 2,3 Mbit/sMax. Distance . . . . . . . . . . . . . . . . . . about 3,5 Km

VDSLMax. Data rate for VDSL: Asymmetric . . . . . . . . up to 26 Mbit/s (Downstream)

up to 3,2 Mbit/s (Upstream)Symmetric . . . . . . . . . . . . . . . . . . . . . . 2 12 Mbit/s Max. Distance . . . . . . . . . . . . . . . . 1,5 Km 500 m

DSLAM

FeaturesArchitecture . . . . . . . . . . . . . . . . . . . . Universal slots

and board redundancySU_ADSL Board: . . . . . . 16 ports for ADSL or UDSLSU_SDSL Board: . . . . . . . . . . . . . . 16 ports for SDSLSU_VDSL Board: . . . . . . . . . . . . . . 24 ports for VDSLSU_nxE1 Board: . . . . . . . . 8 E1 ports for cascadation

Network interfacesSupported interfaces . . STM-1,OC-3c,E3,DS3,E1,DS1 Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ATMPhysical interfaces: . . . . . . . . . . . . . . . . . . . . . . . . . .

STM1/OC-3c Optical . . . Single mode optical fiber,short haul (0 - 25 km) long haul (20 - 60 km)

multimode opt. possibleSTM-1 Electrical . . . . . . . . . . . . . . . 155,52 Mbit/s E3 Electrical . . . . . . . . . . . . . . . . . . 34,386 Mbit/sDS3 Electrical . . . . . . . . . . . . . . . . .44,736 Mbit/sE1 Electrical . . . . . . . . . . . . . . . . . . . .2.048 Mbit/sDS1 Electrical . . . . . . . . . . . . . . . . . . .1.544 Mbit/s

ATM User-network interfaceStandard . . . . . . . . . . . . . . . . . . . . . UNI 3.1, UNI 4.0QoS . . . . . . . . . . . . . . . . CBR, UBR, VBR-nrt, VBR-rtATM functionalities . . . PVC (VP- & VC-crossconnect)

ATM OAM support

TMN interfaceSNMP management interface . . . .via Ethernet 10BT

Power supplyIndoor EquipmentPrimary voltage . . . . . . . . . . . . . 38 VDC to 75 VDC

DC/DC on boardOvervoltage protection. . . . . . . . . . . . . . . . ITU-T K20

Outdoor EquipmentPrimary voltage . . . . . . . . . . . . . 115 VAC or 230 VAC

50 Hz or 60 Hz

Mechanical DimensionIntegration . . . . . . . . . . . up to 224 links per DSLAMRack Size (mm) . . . . . . . . 2200x600x300 (HxWxD)Rack according . . . . . . . . . . . to ETSI ETS 300 119-3Subrack Size (mm) . . . . . . . 721x450x276 (HxWxD)Subracks according . . . . . . . . to ETSI ETS 300 119-4Board Size (mm) . . . . . . . . . . . . . . . 415x235 (HxD)

Technical Specifications

20

Environmental ConditionsIndoor at C.O. . . . . . . . . . ETSI ETS 300 019 class 3.1Operation temperature . . . . . . . . . . . . 5 ... +40 CHumidity . . . . . . . . . . . . . . . . . . . . . 5% ... 95% R.H.CE, EMC/ESD . . . . . . . . . . EN 50081-1, EN 50082-2,

ETS 300 386 and EN 55022 Class BProduct safety . . . . . . . . . . . . . . . . . . DIN EN 60950Indoor at Non-Telco Building . . . . . . . . . . . . . .ETSI ETS 300 019 class 3.2Outdoor in roadside cabinets . . . . . . . . . . . . . ETSI ETS 300 019 class 4.1

Customer Premises Equipment

InterfacesATM . . . . . . . . . . . . . . . . . . . . . . . . ATM 25.6 Mbp/sEthernet . . . . . . . . . . . . Ethernet 10 BT / IEEE 802.2

IEEE 802.3, Ethernet V2Serial Interface . . . . . . . . . . . . . . . . . . USB InterfaceNIC Type (Bus) . . . . . . . . . . . . . . . . PCI Bus InterfacePOTS/ISDN splitter . . . . . . . . . . . . . . . . . . . .external

ModemsXpressLink 1100 . . . . . . . . . . . . . . ADSL, ATM, POTSXpressLink 1101 . . . . . . . . . . . . . . ADSL, ATM, ISDN XpressLink 1010 . . . . . . . ADSL, Ethernet 10BT, POTSXpressLink 1011 . . . . . . . ADSL, Ethernet 10BT, ISDNXpressLink 1110 . ADSL, Ethernet 10BT + ATM, POTSXpressLink 1111 . ADSL, Ethernet 10BT + ATM, ISDNXpressLink 1090 . . . . . ADSL, Ethernet Router, POTSXpressLink 1091 . . . . . ADSL, Ethernet Router, ISDNXpressLink 1500 . . . . . . . . . . . . . . ADSL NIC, POTSXpressLink 3500 . . . . . . . . . . . . . . UDSL NIC, POTS XpressLink 1700 . . . . . . . . . . . . . . ADSL USB, POTSXpressLink 3700 . . . . . . . . . . . . . . UDSL USB, POTSXpressLink 9025 . . . . PC Network Card, ATM 25,6M

Services at ATM interfacePPP over ATM . . . . . . . . . . . . . . . . . . . . . RFC 2364Multi-protocol encapsulation

over ATM . . . . . . . . . . . . . . . . . . . . . . . RFC 1483Classical IP

over ATM . . . . . . . . . . . . . . . . . . . . . . . RFC 1577Ethernet over ATM

LAN emulation (LANE) and others.

Services at Ethernet interfaceSelf-learning bridgeStatic RoutingPPP over PPTPPPP over Ethernet (PPPoE)

Service categoriesATM QoS . . . . . . . . . . CBR, UBR, nrt-VBR, rt-VBR

Power supplyLocal, external . . . . . . . . . 230V/50...60Hz, 110V/60HzLocal, Integr. Power . . . . . 230V/50...60Hz, 110V/60HzLightning protection . . . . . . . . .EN 60950/ IEC 60950

Protection class . . . . . . . . . . . . . . . . . . . . . . . . . II

Mechanical and EnvironmentalClimate Class . . . . . . ETSI ETS 300 019-1-3 class 3.2Operation temperature . . . . . . . . . . . . . 5 ...+50 CCE, EMC/ESD . . . . . . . . . . . . . ETSI ETS 300 386-1,

FTZ 1TR9 (11/96)Product safety . . . . . . . . . DIN EN 60950 / IEC 60950

Management application

MainStreetXpress 45020/46020Management via . . . . . . Ethernet 10BT (IEEE 802.3)

or inband ATMManagement protocol . . . . . . . . . . . . . . . . . . SNMPHardware platform . . . . . . . . . . . . . Sun workstationSoftware platform . . . . . . . . . . . . . . . . . SUN Solaris Features . . . . . . . . . . . . . . . . Client-server scaleable

. . . . . . . . . . . . . . . . . . Topology and Node Display . . . . . . . . . . . . . . . . . Remote software download . . . . . . . . . . . . . . . . . . . . ATM Path Management . . . . . . . . . . . . . . . . . . . . . . . . . OA&M Functions . . . . . . . . . Full integration in Siemens end-to-end

management system

Local Craft Terminal (LCT)Management protocol . . . . . . . . . . . . . . . . . . .SNMPInterface . . . . . . . . . . . SNMP management interface

via Ethernet 10BT (IEEE 802.3) Hardware platform . . . . . . . . . Pentium PC or LaptopSoftware platform . . . . . . . . . Windows NT (4.0, 5.0)

Further Information

XpressLink . . . . . . . . . . . . . . A50001-N8-P60-*-7600MSXpress 45020 . . . . . . . . . . NER:97-2388-A-*-7629MSXpress 46020 . . . . . . . . . NER:97-2348-G-*-7629InterXpress - SSS . . . . . . . . . A50001-N8-P61-*-7600InterXpress IAD 4700 . . . . A30808-X3641-A1-*-7629MSXpress 36140 . . . . . . . . . . NER:97-2637-A-*-7629MSXpress 36170 . . . . . . . . . . NER:97-2345-E-*-7629MSXpress 36190 . . . . . . . . . . NER:97-2346-D-*-7629

21

Abbreviations

ADSL Asymmetric Digital Subscriber Line

AN Access Network

ANSI American National Standardization Institute

API Application Programming Interface

ATM Asynchronous Transfer Mode

ATTH ATM to the Home

B-RAS Broadband Remote Access Server

BB Broadband

CAP Carrierless Amplitude and Phase

Modulation

CBR Constant Bit Rate

DMT Discrete Multitone

DSLAM Digital Subscriber Line AccessMultiplexer

EMC Electromagnetic Compatibility

ETSI European TelecommunicationsStandards Institute

FDM Frequency Division Multiplex

FTTB/C Fiber to the Building/Curb

IP Internet Protocol

ISDN-BA ISDN Basic Access

ISP Internet Service Provider

ITU-T Telecommunication StandardizationSector of InternationalTelecommunication Union

L2F Layer 2 Forwarding

L2TP Layer 2 Tunneling Protocol

LAN Local Area Network

LCT Local Craft Terminal

LL Leased Line

LTAD Line Termination ADSL

LU Line Unit

NB Narrowband

NE Network Element

NIC Network Interface Card

NMS Network Management System

NT Network Termination

OF Optical Fibre

OS Operations System

PBX Private Branch Exchange

PDH Plesiochronous Digital Hierarchy

POP Point of Presence

POTS Plain Old Telephony Service

PPP Point-to-Point Protocol

PSTN Public Switched Telephone Network

PVC Permanent Virtual Connection

QAM Quadrature Amplitude Modulation SDHSynchronous Digital Hierarchy

SDSL Symmetrical Digital Subscriber Line

SME Small/Medium Enterprises

SNMP Simple Network Management Protocol

SOHO Small Office Home Office

SSS Service Selection Server

STB Set Top Box

STM Synchronous Transfer Mode

SU_AD:16 Subscriber Unit ADSL, 16 Ports

SU_VD:24 Subscriber Unit VDSL, 24 Ports

SU_SD:32 Subscriber Unit SDSL, 32 Ports

SVC Switched Virtual Connection

SW Software

UADSL Universal ADSL

UDSL Universal Digital Subscriber Line

TI Texas Instruments

TMN Telecommunication ManagementNetwork

UAWG UADSL Working Group

UBR Unspecified Bit Rate

UDSL Universal Digital Subscriber Line

UNI User Network Interface

UPL User Panel

VBR_rt Variable Bitrate realtime

VBR_nrt Variable Bitrate non-realtime

VDSL Very-high bitrate Digital SubscriberLine

VoD Video on Demand

WAN Wide Area Network

Order No. A50010-D3-A10-4-7629 PA02001.0 Printed in the Federal Republic of Germany

COPYRIGHT Siemens AG 2000 Information and Communication Networks Hofmannstr. 51 D-81359 Munich Germany

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