Specifications

4-68
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
OC12 LR/STM4 LH 1550 Card
4.22 OC12 LR/STM4 LH 1550 Card
The OC12 LR/STM4 LH 1550 card provides one long-range SONET/SDH OC-12 port compliant with
the International Telecommunication Union’s G.707, G.957, and Telcordia’s GR-253. The port operates
at 622.08 Mbps over a single-mode fiber span. The card supports VT and non-concatenated, or
concatenated payloads at STS-1, STS-3c, STS-6c, or STS-12c signal levels. Figure 4-24 shows the
OC12 LR/STM4 LH 1550 faceplate and a block diagram of the card.
Note The OC12 LR 1550 and OC12 LR/STM4 LH 1550 cards are functionally the same.
Figure 4-24 OC12 LR/STM4 LH 1550 faceplate and block diagram
You can install the OC12 LR/STM4 LH 1550 card in any multispeed card slot. The OC12 LR/STM4 LH
1550 can be provisioned as part of a two-fiber BLSR, UPSR or linear ADM.
The OC12 LR/STM4 LH 1550 uses long-reach optics centered at 1550 nm and contains a transmit and
receive connector (labeled) on the card faceplate. The OC12 LR/STM4 LH 1550 uses SC optical
connections and supports 1+1 bidirectional or unidirectional protection switching.
The OC12 LR/STM4 LH 1550 detects LOS, LOF, LOP, AIS-L, and RDI-L conditions. See Chapter 1,
“Alarm Troubleshooting” for a description of these conditions. The card also counts section and line BIT
errors.
uP bus
uP
Flash
RAM
BTC
ASIC
STS-12
Mux/
Demux
Optical
Transceiver
OC-12
Main SCI
Protect SCI
STS-12
B
a
c
k
p
l
a
n
e
61355
FAIL
ACT
SF
OC12LR
STM4LH
1550
1
Tx
Rx
33678 12931