Nortel Networks OPTera Metro 3500 - Manual (Page 283)

Hardware feature descriptions 3-55
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
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.
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.
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