Nortel Networks 3500, NTRN10AN manual VTX-48e circuit pack NTN414AB, NTN414AH, Equipping rules

Hardware feature descriptions 3-55

Equipping rules

The VTX-48 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 1: The VTX-48 circuit pack (NTN414AA) only supports the OC-48 line rate in slots 11 and 12.

Note 2: The OC-12 line rate is supported in slots 11 and 12 only if slots 13 and 14 are equipped with VTX-48e circuit packs (NTN414AB or NTN414AH).

Alarm LED definitions

The following table provides a list of LEDs on the STX-192 circuit packs.

LED name	Color	Description
Status (top)	red	Circuit pack failure
Status (bottom)	green	VTX in an in-service state
Pri Fail	yellow	Loss of primary timing reference signal
Sec Fail	yellow	Loss of secondary timing reference signal

VTX-48e circuit pack (NTN414AB, NTN414AH)

The VTX-48e circuit pack supports the use of both OC-12 and OC-48 line rate in slots 11 and 12.

VTX-48e 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). VTX-48e circuit packs also support DS1 ESF BITS synchronization status messaging.

VTX-48e circuit packs manage synchronization and shelf bandwidth as separate entities. For example, if there is a synchronization failure on the VTX-48e circuit pack in slot 13, and a bandwidth management functional block failure on the VTX-48e circuit pack in slot 14, the system can still carry traffic and provide synchronization timing to other network elements.

VTX-48 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 VTX-48e circuit packs can be taken out of service at a time.

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