3-76Hardware feature descriptions

Optical transmit

The OC-12x4 STS optical interface circuit pack receives STS-12, and STS-12c frames from the STX-192 circuit pack. The OC-12x4 STS optical interface circuit pack converts the STS-12 or STS-12c signals into OC-12 optical signals.

Optical receive

The OC-12x4 STS interface receives optical signals on the optical receive channel and converts the OC-12 signals into STS-12 or STS-12c signals. The STS-12 or STS-12c signal is transmitted to the STX-192 circuit pack.

Equipping rules

The OC-12x4 STS optical interface circuit pack can be installed in any of slots 3 through 10 on the OPTera Metro 3500 shelf. See Table 3-3 on page 3-6for operational temperature ranges.

Note 1: Requires the shelf be equipped with STX-192 circuit packs in slots 13 and 14.

Note 2: You can provision the protection schemes of the four optical ports on the OC-12x4 STS circuit pack independently of one another and in all possible combinations. For example, ports 1 and 2 may be 1+1 linear, while ports 3 and 4 may be UPSR.

1+1 linear

A protected 1+1 linear system operating at an OC-12 line rate - and employing OC-12x4 STS circuit packs - requires two OC-12x4 STS circuit packs in each shelf. Unprotected OC-12 linear systems require only one OC-12x4 STS circuit pack in each shelf. The additional OC-12x4 STS optical interface circuit packs can be installed in the shelf to provide OC-12 tributaries.

Note: 1+1 line protection can be used only between OC-12 ports which have the same port number and which are located on OC-12x4 STS optical interface circuit packs installed in adjacent slots. OC-12 ports in the odd slot act as the working line, and OC-12 ports in the even slot act as the protection line.

Unidirectional path switched rings (UPSRs)

UPSRs operating at an OC-12 line rate - and employing OC-12x4 STS circuit packs - require two OC-12x4 STS circuit packs in each shelf.

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

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Nortel Networks NTRN10AN, 3500 manual 76Hardware feature descriptions