Specifications

4-74
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
OC48 LR 1550 Card
4.24 OC48 LR 1550 Card
The OC48 LR 1550 card provides one long-range, Telcordia-compliant, GR-253 SONET OC-48 port per
card. Each port operates at 2.49 Gbps over a single-mode fiber span. The card supports VT,
non-concatenated or concatenated payloads at STS-1, STS-3c, STS-6c STS-12c or STS-48c signal
levels. Figure 4-26 shows the OC48 LR 1550 faceplate and a block diagram of the card.
Figure 4-26 OC48 LR 1550 faceplate and block diagram
You can install OC48 LR 1550 cards in any high-speed slot on the ONS 15454 and provision the card as
a drop or span card in a two-fiber or four-fiber BLSR, UPSR, or in an ADM (linear) configuration.
The OC48 LR 1550 port features a 1550 nm laser and contains a transmit and receive connector (labeled)
on the card faceplate. The card uses SC connectors, and it supports 1+1 unidirectional and bidirectional
protection switching.
The OC48 LR 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
Optical
Transceiver
OC-48
Main SCI
Protect SCI
STS-48
61359
Mux/
Demux
B
a
c
k
p
l
a
n
e
FAIL
ACT
SF
OC48
LR
1550
1
33678 12931
Tx
Rx