Equipping rules, Equipping rules 3-76 – Nortel Networks OPTera Metro 3500 User Manual
Page 304
3-76 Hardware feature descriptions
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
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
for
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.