2488 mbit/s (stm-16) synchronous add drop … - 1664 sm block diagram configuration performance...

ALCATEL 1664 SM Synchronous Add-Drop Multiplexer, (2488Mbit/s) compliance with SDH ITU-T Standards.•140 Mbit/s plesiochronous

tributaries. •Synchronous STM 1 (155.250

Mbit/s) Electrical and Optical tributaries.

•Synchronous STM 4 (622Mbit/s) Optical tributaries.

•Line Terminal and Add-Dropconfigurations unprotected orprotected both at Tributary and at Common Part level.

•Wide Optical Interface choicefor transmission on G652,G653 and G654 fibers.

•Self-healing ring protection schemes:- SNC-P at VC4 level.- 2 Fiber and 4 FiberMultiplex Section SharedProtection Rings (MS-SPRINGs).

•Dual node ring interconnecting facility.

•VC4 cross connect features.•Flexible tributary allocation inside STM-16 frame.

•Wide service channel availability.

•Network Management facilities.

•Integrated OFA capability.

Alcatel 1664 SM2488 Mbit/s (STM-16)Synchronous Add Drop Multiplexer

The Alcatel 1664 SM Synchronous Add-Drop Multiplexer, is part of Alcatel's family of products that comply with the synchronous digitalhierarchy (SDH) defined in the relevant ITU-T Recommendations.The 1664 SM is an STM-16 system fortransmission and add/drop of STM-1and STM-4 signals.

The tributaries can be 140/155 Mbit/selectrical, optical STM-1 and optical STM-4.Up to 8+1 (spare) 140 Mbit/s or STM-1 tributary units or up to 4 STM-4 tributary can be housed in the 1664 SM.Any mix of the above tributary units is

possible in the same shelf.The system can be configured as LineTerminal Equipment, or as Add-DropMul t ip lexer in both protected andunprotected configurations for transmission on standard anddispersion shifted fibers.

The tributary subsystem can provide 1+1, or 1+N (N=max 8 Cards) HWprotection facilities for electricaltributary. The STM-1 and STM-4 tributaries can be MS protected in 1:1or 1+1 configuration.A VC4 cross connect matrix allowsthe possibility to change the inframeallocation of the tributary signals in theSTM-16 stream.

Up to 4 Aggregate units can be fittedin the shelf when the line interfaces are 1+1 (or 1:1) protected in Add-Drop configuration.Two of the four Aggregate cards canbe replaced with two IntegratedOptical Fiber Amplifier units (OFA) forapplication on ultra long distance link.

An extensive auxi l iary capacity, inaccordance with SDH standards, isavailable for embedded services anduser accessible interfaces.The system is fully managed locally by a standard PC connected via the Craft Terminal 'F' interface which uses standard MS-DOS/Window based SW being able to make equipment

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Fig. 1 - 1664 SM Mechanical Layout

Fig.2 - 1664 SM Block Diagram

configuration Performance Monitoring and Alarm Status enquiries.Through the QB3 interface connection to TNM systems, at the EML and NMLlayers, is possible as part of theTelecommunications NetworkManagement.The following main applications for the1664 SM have been identified in thetelecommunication network:metropolitan rings, regional and national backbones, linear links,international gateways and long spanlinks.The product is suitable forapplications in both linear and ringnetwork typologies.

As far as the ring solutions are concerned, it is possible to implementSNCP and MS-SPRING protectionmechanisms.Optical length spans up to about160 Km can be covered.The 1664 SM can perform the following functions:• 1+0 & 1+1 Terminal multiplexer• Add/Drop multiplexer• HubThe above functions can be providedwith Integrated Optical Amplifier.A VC4 cross-connect matrix allows theuse of the 1664 SM as a small cross-connect node with a maximum capacity of the 16 STM-1 equivalent ports.

For long-haul an STM-16regenerator according to ITU-T G958is also available. The regenerator is athrough-timing network elementmanageable remotely from the 1664 SM terminals or ADM's, and locallythrough an Equipment Craft Terminal(ECT). It can also be equipped withIntegrated Optical Amplifiers.

This equipment adopts the mostadvanced technologies suitable tooptimize dimensions, power consumption and reliability, such as:

• VLSI HCMOS and ECL Asics• Electro-Optic hybrid circuits• Surface mounting

140/155 Mbit/s ELECTRICAL ACCESS MODULES

140/155Mbit/sELECTR.BITRIB.

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140/155Mbit/sELECTR.BITRIB.

140/155Mbit/sELECTR.BITRIB.

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140/155 Mbit/s ELECTRICAL INTERFACEOPTICAL INTERFACES

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STM - 16 AGGR.WB

STM - 16 AGGR.EA

STM - 16 AGGR.EB

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Equipment structureThe mechanical desing of the 1664SM is compact and modular.The equipment can be mounted in theAlcatel S9 rack, which complies withETS300119.The S9 equipment rack can house up to two 1664 SM shelves.The printed board dimensions for all units are Double Eurocards (233 mm high x 220 mm deep). Figure 1 shows an example layout of the 1664 SM shelf.

The upper part is devoted to the frontinterconnection panel which houses the access and protection switch modules.

The lower part of the shelf containsslots for the following units:• 4 slots for aggregate units (2 slots

can also be devoted to integratedOFA's)

• 1 slot for equipment controller• 3 slots for power units

The middle section of the shelf contains slots for the following units:• 9 slots for tributaries• 2 slots for clock reference units• 1 slot for aux unit• 2 slots for switch units

System descriptionThe 1664 SM can be equipped with up to four STM-16 aggregates. TheSTM-16 aggregate is a bidirectionalinterface, one STM-16 optical transmitter and one STM-16 opticalreceiver are mounted on eachaggregate unit (transceiver). Up totwo STM-16 aggregates can be replaced with two OFA Units.

The 1664 SM can be equipped withup to eight plus one 140/155 Mbit:sor STM-1 bitributary units or up tofour STM-4 tributary units.Both bitributary and tributary cardsprovide bidirectional interface.

The traffic modularity is equivalent totwo STM-1 channels for bitributaryunits and four STM-1 channels for STM-4 tributary units.The tributaries can be of the followingtypes:• 140/155 Mbit:s electrical

according to G703The choice between 140 or 155Mbit/s is set via SW from both ECT orOS:

• STM-1 Optical according to G957• STM-4 Optical according to G957Every mix of tributaries is possible.

Two redundant Clock Reference units are devoted to the generation anddistribution of the clock necessary tosynchronize the system.

A very powerful control system guarantees complete alarm,diagnostic, configuration provisioning and performance monitoring

management.One of the three power supplies is in hot stand-by.Figure 2 shows an example of 1664 SM Block Diagram.

All units except the power supplies have an on-board microprocessor which is slave to the Equipment Controller.Remote inventory is also implemented.The equipment controller interfaces are:

• F interface to the local Craft Terminal• QB3 interface to the TMN

The SDH standard offers a large capacity of overhead channels.The 1664 SM offers access to several of those channels through 64 kbit/s and 2 Mbit/s interfaces.

Direct access by microtelephone to an on-board Engineering Order Wire with DTMF signalling is possible.

Optical InterfacesWith reference to ITU-T recommendation G.957, the STM-16optical interfaces are short and long haul types working at 1300 and 1550 nm wavelengths:S-16.1; L-16.1; L-16.2.

Two types of L-16.2 J.E. optical interfaces are also availabledepending of the total dispersionrequired.LASERS are DFB and the detectors are inGaAs APDs and PINs.

The STM-1 tributary optical interfaces are S-1.1, L-1.1, L-1.2 types.

The STM-4 tributary optical interfacesare S-4.1 and L-4.2 types.The Optical source are InGaAsP Laserdiodes Fabry-Perot type for 1300nm; DFB type for 1550 nm.The optical receivers are Germanium or InGaAs APD.

Standard connectors are FC-PC or SC-PC type.

Automatic laser shutdown facility is implemented, according to CCITT Rec. G.958.

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