Nortel Networks NTRN10AN, 3500 manual 74Hardware feature descriptions

3-74Hardware feature descriptions

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

OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004