Nortel Networks OPTera Metro 3500 - Manual (Page 302)

3-74 Hardware feature descriptions
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
OC-12 path switching uses nonrevertive protection. There are no permanent
VT1.5, STS-1, STS-3c, or STS-12c protection or working paths. The network
element receives two incoming VT1.5, STS-1, STS-3c, or STS-12c signals:
one from the provisioned working optical interface circuit pack and one from
the switchmate optical interface circuit pack. The network element selects the
better of the two signals.
Note: VT1.5 signal rate is supported on OPTera Metro 3500 shelves
equipped with VTX-series circuit packs.
Protection of path failures on a single OC-12 optical interface completes in
60 ms, but protection of simultaneous path failures on multiple OC-12 optical
interfaces completes in less than 200 ms.
Section data communication channel (SDCC)
An OC-12 line carries a DCC channel that can be edited, provisioned, and
deprovisioned.
Note 1: The maximum number of simultaneous SDCC-provisionable
ports on an OPTera Metro 3500 shelf is 34 (the shelf must be equipped with
eight unprotected OC-3x4 or OC-12x4 STS circuit packs in slots 3 through
10, and a protected pair of OC-48 or OC-192 circuit packs in slots 11 and
12).
Note 2: For Nortel Networks interworking and multi-vendor network
scenarios, DCC interoperability can be achieved with the appropriate
provisioning. See Optical Networks Data Communications Network
Planning Guide, NTR710AM.
Alarm LED definitions
The following table provides a list of LEDS of the OC-12 interface circuit
pack.
LED Color Description
Status (top) Red Circuit pack failure
Yellow Loss of signal
Status (bottom) Green In service and carrying traffic