Nortel Networks OPTera Metro 3500 - Manual (Page 282)

3-54 Hardware feature descriptions
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Alarm LED definitions
The following table provides a list of LEDs on the STX-192 circuit packs.
VTX-48 circuit pack
(NTN414AA)
VTX-48 circuit packs can be equipped in slots 13 and 14. The VTX-48 circuit
pack is rated for operation in the temperature range of 0
° C to +50 ° C.
VTX-48 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 VTX-48 circuit
packs also support DS1 ESF BITS synchronization status messaging.
The VTX-48 circuit packs manage synchronization and shelf bandwidth as
separate entities. For example, if there is a synchronization failure on the
VTX-48 circuit pack in slot 13, and a bandwidth management functional block
failure on the VTX-48 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-48 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 VTX-48 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.
LED name Color Description
Status (top) red Circuit pack failure
Status (bottom) green STX in an in-service state
Pri Fail yellow Loss of primary timing reference signal
Sec Fail yellow Loss of secondary timing reference signal