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Cisco ONS 15454 Reference Manual, R7.0.1
OL-9217-01
Chapter 4 Optical Cards
4.7 4.7 OC12 IR/STM4 SH 1310-4 Card
Figure 4-6 OC12 IR/STM4 SH 1310-4 Faceplate and Block Diagram
You can install the OC12 IR/STM4 SH 1310-4 card in Slots 1 to 4 and 14 to 17. Each interface features
a 1310-nm laser and contains a transmit and receive connector (labeled) on the card faceplate. The card
uses SC connectors.
The OC12 IR/STM4 SH 1310-4 card supports 1+1 unidirectional and bidirectional protection switching.
You can provision protection on a per port basis.
The OC12 IR/STM4 SH 1310-4 card detects LOS, LOF, LOP, MS-AIS, and MS-FERF conditions. Refer
to the Cisco ONS 15454 Troubleshooting Guide for a description of these conditions. The card also
counts section and line BIP errors.
To enable BLSR, the OC12 IR/STM4 SH 1310-4 card extracts the K1 and K2 bytes from the SONET
overhead and processes them to switch accordingly. The DCC/GCC bytes are forwarded to the
TCC2/TCC2P card, which terminates the DCC/GCC.
Note If you ever expect to upgrade an OC-12/STM-4 ring to a higher bit rate, you should not put an
OC12 IR/STM4 SH 1310-4 card in that ring. The four-port card is not upgradable to a single-port card.
The reason is that four different spans, possibly going to four different nodes, cannot be merged to a
single span.
uP bus
uP
Flash
RAM
ASIC
B
a
c
k
p
l
a
n
e
STS-12
Optical
Transceiver
Optical
Transceiver
Optical
Transceiver
Optical
Transceiver
STS-12/STM-4
termination/
framing
STS-12/STM-4
termination/
framing
STS-12/STM-4
termination/
framing
STS-12/STM-4
termination/
framing
OC-12
STM-4
78095
1
33678 12931
Tx
Rx
2
Tx
Rx
4
Tx
Rx
3
Tx
Rx
FAIL
ACT
SF
OC12IR
STM4SH
1310-4
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