Nortel Networks 3500 User Manual
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.
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.
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).
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)
(NTN414AB, NTN414AH)
The VTX-48e circuit pack supports the use of both OC-12 and OC-48 line rate
in slots 11 and 12.
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.
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.
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.
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