Nortel Networks 3500 manual STX-192 circuit pack NTN415AA, External timing reference input signals

Hardware feature descriptions 3-51

STX-192 circuit pack (NTN415AA)

STX-192 circuit packs can be equipped in slots 13 and 14. The STX-192 circuit pack is rated for operation in the temperature range of 0°C to +50°C.

STX-192 circuit packs provide monitoring and control for provisioning, cross-connect management, shelf timing generation, and synchronization messaging. The internal clock quality is Stratum 3 (ST3). The STX-192 circuit packs also support DS1 ESF BITS synchronization status messaging.

The STX-192 circuit packs manage synchronization and shelf bandwidth as separate entities. For example, if there is a synchronization failure on the STX-192 circuit pack in slot 13, and a bandwidth management functional block failure on the STX-192 circuit pack in slot 14, the system can still carry traffic and provide synchronization timing to other network elements.

STX-192 equipment operates in 1+1 redundant mode to provide cross-connect and clock distribution functions for OPTera Metro 3500. It is always autoprovisioned and cannot be deleted. Only one of the two STX-192 circuit packs can be taken out of service at a time.

External timing reference input signals

The OPTera Metro 3500 shelf can receive timing signals from an external timing source such as a stratum clock or a BITS when the shelf is equipped with a STX-192 circuit pack. The BITS is connected to the network element by wire-wrap connectors on the left OAM (LOAM). The timing signals from an external timing source are called BITSIN-A and BITSIN-B.

Equipping rules

The STX-192 circuit pack is a double-width circuit pack that can be installed in slot 13 and slot 14 of the OPTera Metro 3500 shelf.

Note: You can not mix STX-192 circuit packs with VTX-series circuit packs (e.g. VTX-48 and STX-192) during normal operation. A circuit pack incompatibility alarm will be raised will be raised if this occurs.

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