Nortel Networks 3500, NTRN10AN manual DS1 service module DSM shelf NTN407MA, Multiple is

Hardware feature descriptions 3-107

DS1 service module (DSM) shelf (NTN407MA)

The DS1 service module (DSM) is a peripheral shelf connected to an OPTera Metro 3500 network element. The DSM connects to the OPTera Metro 3500 network element through the ports on a host OC-3 or OC-3x4 circuit pack. The DSM is a terminal DS1 multiplexer. The DSM has three I/Os. Each I/O supports 1 through 28 DS1 facilities.

The DSM has two numbered slots for DSM DS1x84 termination module (TM) circuit packs. DSM DS1x84 TM circuit packs support 1 through 84 DS1 facilities. The two circuit packs provide 1+1 protection. The DSM can be equipped with one circuit pack for an unprotected configuration.

Equipping rules

The DSM connects to the OC-3 ports on the OPTera Metro 3500 shelf using one (unprotected) or two (protected) OC-3 optical interfaces. An OPTera Metro 3500 shelf supports one through twelve protected or unprotected DSMs. See Table 3-3 on page 3-6for operational temperature ranges.

Note: To have up to twelve protected or unprotected DSM shelves on a single OPTera Metro 3500 shelf, you must use OC-3x4 circuit packs. If you use OC-3 circuit packs, your maximum number of protected DSM shelves is four or eight unprotected.

Multiple IS

Multiple intermediate system (IS) is a function that allows the DSM, and communication between the DSM shelf and the shelf processor on the host network element, to remain hidden from the NPx and other network elements in the network.

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004