Alcatel 1686 WM32 Channels DWDM System (Regional & Metro)

• Compliant with G.692 ITU-Tstandards.

• Product based on flat gainamplifiers and dense wavelengthdivision multiplexers.

• Designed for very high capacitynetworks: up to 32 wavelengths@ STM-64.

• Tributary bit rate from 100Mbit/sto 1.25 Gbit/s, 2.5 Gbit/s and 10 Gbits/s.

• Optical Terminal multiplexer (inthe 1530 nm-1560 nm band) forpoint to point, point to multi-pointand ring configuration.

• Optimised architecture forconfiguration without in-lineamplifier or short haulapplication.

• In-line equipment for multi-spanlong haul links: up to 700 kmwithout Dispersion CompensatingUnit (DCU).

• Optical Add Drop function.• Dispersion Compensation units for

long distance/high bit-ratetransmission.

• Fully compatible with G.652 andG.655 fibres, also compatible withG.653 fibre with some limitations.

• Wavelength adapter with optionalForward Error Correction codes(FEC) for performanceimprovement and OpticalPerformance Monitoring.

• Regenerator units to extend thereach of the system.

• Linear and Ring OpticalProtection.

• Service channel availability.• Network Management facilities.• Optical Safety implemented

according to G.681.• Performance Monitoring

capability.

A R C H I T E C T S O F A N I N T E R N E T W O R L D

Experience what’s next inoptical networking with theOPTINEXTM DWDMsystems portfolio.It offers the most complete andcost effective solution for endto end provisioning of a fullrange of broadband services.

Optinex

OverviewThe Alcatel 1686 WM wavelengthdivision multiplexer is part of theAlcatel Optinex catalogue. The 1686 WM is a multi-channeloptical transmission system designedto transmit up to 32 bi-directionalsignals on a pair of fibres.The Alcatel 1686 WM covers a widerange of optical interfaces rangingfrom 4L-16.2 to 32L8-16.2 and32L6-64.2 as defined in G.692 ITU-Tspecification.This system is composed by twoterminal stations and several linestations, the line stations can be Linerepeaters (optical amplifiers) orOADM repeaters (optical add dropmultiplexers). By means of the OpticalMultiplexer/Demultiplexer the systemis able to combine up to 32 opticalsignals and to transmit the resultingaggregate signal on one opticalfibre.The system can accept directconnection of SDH, IP, ATMequipment, but optional wavelengthadapters are also available, when the1686 WM is used in an openenvironment, to increase the capacityof an existing network. The wavelength adapters can add aForward Error Correction code (FEC)to the output signal to improve thesystem performances and toimplement the PerformanceMonitoring of each transmittedchannel.For very long haul transmission,Regenerators can be used to extendthe reach of the system.Typically the system is installed in thetelecommunication network as part ofnational backbones, in linear links

and in international gateways wherethe amount of traffic requires thetransmission of more than oneoptical signal.Spans length longer than 180 Kmcan be achieved without in lineamplification and up to 700 km canbe achieved without DispersionCompensation.

The system is fully managed locallyby a standard PC, connected via thecraft terminal F interface, withstandard MS-DOS/Windows basedsoftware. This allows access to theequipment configuration and alarmstatus. Centralised management is possiblethrough the Q interface connection tothe Transmission NetworkManagement. A dedicated channel (Opticalsupervisory channel) is provided tomanage and to communicate withthe distant in line amplifiers and theremote terminal.

Inter Connection Panel

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Fig. 2: Mechanical layout of the fullyequipped optional wavelengthadapter subrack at 2.5 Gb/s.

Fig. 1: Mechanical layout of the masterterminal of the 1686 WM.

Equipment structureThe mechanical design of the 1686 WM is compact and modular.The equipment is divided into twoblocks, one for the terminal stationand one for the line station. It can bemounted in the Alcatel S9 rack orAlcatel Optinex rack, which complieswith ETSI standard ETS 300119.

Terminal stationUp to three 1686 WM shelves can behoused in a single S9 or Optinexequipment rack.

Fig. 1 shows the mechanical layout ofthe master terminal of the 1686 WM,fig. 2 shows the layout of the optionalwavelength adapter @ 2.5 Gb/s.The master terminal provides themultiplexing and demultiplexingfunctions.It contains:• two multiplexing and

demultiplexing boards to mix upto 16 wavelengths per unit in onedirection and to divide them in theopposite one;

• two optical amplifiers to be usedas booster in one direction and aspreamplifier in the other ;

• an auxiliary board and anequipment controller board formanagement of the equipmentthrough F and Q interfaces andfor the provisioning of auxiliarydata channels;

• an expansion unit to combine thetwo 16 channels signals into the32 wavelengths multiplexed signalin one direction and to dividethem in the opposite one;

• two power supplies.

The booster amplifier can beremoved for short haul/metroapplications.

The optional wavelength adaptersubrack is devoted to the adaptationof standard signals to signalscompatible with multi-wavelengthtransmission system.The subrack for 2.5 Gb/s wavelengthadapters contains:

• a serialiser board formanagement of the subrack ;

• one to eight wavelength adapterboards ;

• two power supplies.

The power units are 1+1 protected.

In this subrack the Multiclockwavelength adapters can also beinstalled. These units accept at theirinput signals with different bit/ratesranging from 100 Mb/s to 1.25 Gb/s. The subrack for 10 Gb/swavelength adapters contains:

• one to four bi-directionalwavelength adapters boards;

• one modified serialiser for themanagement of the subrack

• three power supplies

The power units are 2+1 protected.In the standard configuration,

Inter Connection Panel

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Fig. 3: Line station subrack layout

all optical boards are equipped withFC/SPC, SC/SPC or SC2/SPCconnectors located on the frontpanel.

Line stationFig. 3 shows the mechanical layout ofthe line subrack. The line stationprovides the optical amplifyingfunctions. It contains:

• two optical line amplifier boardsper station (one for eachdirection);

• two optional optical add dropunits to insert or extract up toeight wavelengths per direction

• an auxiliary board;• an equipment controller board for

the management of theequipment and provisioning ofauxiliary data channels;

• two power supplies.

The power units are 1+1 protectedAll the optical boards are equippedwith FC/SPC, SC/SPC or SC2/SPCconnectors located on the frontpanel.

System descriptionFig. 4 shows the block diagram ofthe 1686 WM.

Terminal EquipmentThe input signals of the 1686 WMmay be either standard opticalsignals or pre " coloured " signals.In the first case, the use of thewavelength adapter is mandatory. In this unit, the wavelength of theinput signals is shifted to a valuecompliant with multi-wavelengthtransmission.

The optical signals at the output ofthe wavelength adapters are said tobe "coloured signals". The wavelength adapter optionallyadds a Forward Error Correctioncode to the output signal in order toimprove the transmission quality, theperformances and to provide perchannel Performance Monitoring.

In the second case, whichcorresponds to STM-16 or to STM-64ADM Alcatel products, the opticalsignals are already coloured by theoptical interfaces of the SDHequipment. So the wavelength adapter is nolonger necessary, which leads to costoptimised solutions and improvedreliability.Other different clients (IP, ATM,....)are supported by the system using thewavelength adapters.The " coloured " signals are sent tothe input of the multiplexers and thento the expansion unit. The composite signal enters anoptical amplifier (booster) to increasethe optical power.

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Fig. 4: 1686 WM Block diagram

At this stage, an extra channel (theoptical supervisory channel) is addedto transport auxiliary data channelsand management information to theremote equipment. The behaviour ofthe optical amplifiers is alwayscontrolled by an extra channel calledsaturation channel. It helps tomaintain the system performancesunchanged whatever the channelcount is. The saturation channel isadded/removed by the Expansionunit. On the receiver side, an opticalamplifier separates the supervisorychannel from the optical signal,which is then amplified. The demultiplexer separates thecomposite signal into individualsignals, which are sent to the receiverof the associated equipment.

Line EquipmentIn the line equipment, the supervisorychannel is separated from the opticalsignal inside the in-line amplifierboard.The multiplexed signal is thenamplified by an in-line opticalamplifier and added to the opticalsupervisory channel provided by theAux. board. Add and drop of one or morewavelengths is possible with the useof the optical add drop unit. This unit is configurable by software. This means that an operator canremotely decide if a wavelength cango through or must be dropped inthe station.

SafetyAutomatic laser shut down isimplemented in the system. Thisfeature is compliant with the G.681ITU-T recommendation.

In case OADM repeaters are installedin a link, only the section where thefailure occurred is affected by theautomatic laser shutdown.

System specificationsApplications types - Terminal optical multiplexer with or without in-line

amplifiers - Optical add drop function

Optical interfacesOptical tributaries according to G.957 S.1.1; S.4.1; S.16.1; L.1.2;

L.4.2; S.64.2Tributary bit rates from 100 Mbit/s to 1250 Mbit/s, 2.5 Gbit/s and

10 Gbit/sNumber of tributaries up to 32 in C band Optical aggregate wavelength multiplexed signalNumber of aggregate 1

Optical budget0 ÷ 14 dB, short haul application 38 dB (single span) and 208 dB (8x26dB) with optical amplifiers @ STM-1644 dB (single span) and 256 dB (8x32dB) with optical amplifiers and FEC @ STM-1638 dB (single span) and 200 dB (8x25dB) with optical amplifiers and FEC @ STM-64

Maximum optical path 6400 ps/nm and 12800 ps/nm at 2,5 Gbit/schromatic dispersion 1000 ps/nm at 10 Gbit/s. Higher values can be

tolerated with Dispersion Compensating Units.

Optical safety Compilant to Rec. G.681

Standard optical connector SC/SPC, FC/SPC or SC2/SPC

ProtectionNetwork protection Assumed in the SDH equipmentLinear optical protection OMS - OChRing optical protection O-SNCP with D & C

OperationStation alarms Urgent, Non Urgent, AttendedNM access Q interface G.773 10 base Craft interface RS.232 9600 Bauds PC compatible 9 pin D

Data communicationHousekeeping 8 inputs and 8 outputsSystem alarms One LED on each card plus central LEDData channels number 2 V.11 or G.703 64 Kbit/s channels

Operation processesRemote inventory at card levelSoftware download, local and remote without traffic interruptionPerformance monitoring according to Rec. G.784

Technical Specifications

Example: optical grid (wavelength in nm)

λ1 = 1559.79 ; λ2 = 1558.98 ; λ3 = 1558.17 ; λ4 = 1557.36 ; λ5 = 1556.55 ;

λ6 = 1555.75 ; λ7 = 1554.94 ; λ8 = 1554.13 ; λ9 = 1553.33 ; λ10 = 1552.52 ;

λ11 = 1551.72 ; λ12 = 1550.92 ; λ13 = 1550.12 ; λ14 = 1549.32 ; λ15 = 1548.51 ;

λ16 = 1547.72 ; λ17 = 1542.94 ; λ18 = 1542.14 ; λ19 = 1541.35 ; λ20 = 1540.56 ;

λ21 = 1539.77 ; λ22 = 1538.98 ; λ23 = 1538.19 ; λ24 = 1537.40 ; λ25 = 1536.61 ;

λ26 = 1535.82 ; λ27 = 1535.04 ; λ28 = 1534.25 ; λ29 = 1533.47 ; λ30 = 1532.68 ;

λ31 = 1531.90 ; λ32 = 1531.12

Optical grid of the 1686 WM (underlined 200 GHz grid)

A R C H I T E C T S O F A N I N T E R N E T W O R L D

All rights reserved © 2001Alcatel, Paris.

The information in this leaflet isgenerally applicable to the equipment described. However,Alcatel is committed tocontinuous research anddevelopment. Changes maytherefore be made in the futurewithout notice.

3AL 74998 AAAA Ed.04 - February 2001Printed in Italy

ALCATEL

Terrestrial Networks Division

Via Trento 3020059 Vimercate (MI) ItalyTel. +39 039 686 9120Fax +39 039 686 4849http: //www.alcatel.com

Mechanical specifications

Dimensions (in mm)S9 rack: HxWxD = 2200 x 600 x 300 or 600 (net height for the equipment: 1850 mm)Optinex rack: HxWxD = 2200 x 600 x 300 or600 (net height for the equipment: 2000 mm)

Master Subrack: HxW = 400 x 482WLA Subrack: HxW = 400 x 482

Boards: HxD = 233 x 220 (Double Eurocards)

Power SpecificationsBattery: 48/60 V DC Acc. DE/EE2001Maximum power dissipation: ≈400 W WLA 10 Gb/s shelf fully equipped)

Environmental specificationsTemperatureOperating condition ETS 300 019 class 3.2Storage condition ETS 300 019 class 1.2Transport condition ETS 300 019 class 2.1

ESD/EMCESD/EMC condition ETS 300 386-1

(Telecom Centre)

1530

196.0 195.5 195.0 194.5 194.0 193.5 193.0 192.5 191.5192.0 191.0

1535 1540 1545 1550 1555 1560 1565Wavelength(nm)

Frequency(THz)

Optical interfacesThe 1686 WM system can beconnected either directly to ALCATELSDH equipment or, via wavelengthadapters, to different kind of signals.If Alcatel STM-16 or STM-64 SDHproducts are used, a large choice ofinterfaces is available, compliant withthe relevant ITU-T specifications.These optical interfaces are located inthe Alcatel SDH equipment.If the wavelength adapter is used, theoptical interface depends on the typeof input signal. The wavelengthadapter is compatible to S.1.1; L.1.2;S.4.1. L.4.2; S.16.1; S.64.2 andother interfaces are available onrequest.

Optical protectionsFor all the services that do notprovide intrinsic protection, thefollowing optical protections areavailable:

• Linear configurations- OMS (Optical Multiplex

Section)- OCh (Optical Channel)

• Rings- O-SNCP- O-SNCP with D&C (drop and

continue) to protect frommultiple faults in the ringsinterconnection