Nortel Networks 3500, NTRN10AN manual Equipping rules

Hardware feature descriptions 3-81

•62.5 ∝m mode-conditioning patch-cord is required on the transmitter at each end of the link.

•The multimode fiber (MMF) link length (excluding mode-conditioning patch cord) is greater than (>) 5 m and less than (<) 2 km.

•Mating receivers either have no ’pigtails’ or use MMF ’pigtails’.

•Mating receiver do not use a single-mode stub for reflectance reduction.

•Mating transmitters are connected to the mode-conditioning patch cords via Single Mode Fiber (SMF).

•Mating receivers meet IR-1/S-1.1 parameters as per ANSI T1.105.06-2002/ITU-T G.957.

•One fiber per direction.

Exception to any of these conditions require consultation with Nortel Networks.

Optical transmit

The OC-3x4 optical interface circuit pack receives STS-3 or STS-3c frames from the STX or VTX-series circuit packs circuit pack. The OC-3x4 optical interface circuit pack converts the STS-3 or STS-3c signals into OC-3 optical signals.

Optical receive

The OC-3x4 interface receives optical signals on the optical receive channel and converts the OC-3 signals into STS-3 or STS-3c signals. The STS-3 or STS-3c signals are routed to the STX or VTX-series circuit packs circuit pack. Due to receiver overload tolerance, VOAs are not required for OC-3x4 optical interface circuit packs when working against IR optical interfaces.

Equipping rules

The OC-3x4 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: You can provision the protection schemes of the four optical ports on the OC-3x4 circuit pack independently of one another and in all possible combinations. For example, ports 1and 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-3 line rate - and employing OC-3x4 circuit packs - requires two OC-3x4 circuit packs in each shelf. Unprotected OC-3 linear systems require only one OC-3x4 circuit pack in each shelf. The additional OC-3x4 optical interface circuit packs can be installed in the shelf to provide OC-3 tributaries.

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004