Equipping rules, Equipping rules 3-81 – Nortel Networks OPTera Metro 3500 User Manual
Page 309
Hardware feature descriptions 3-81
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
•
62.5
µm
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
for
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.