Cisco ONS 15454 Reference Manual page 229

Chapter 4 Optical Cards
Figure 4-18
1550
FAIL
ACT/STBY
SF
TX
1
RX
RX
!
MAX INPUT
POWER LEVEL
-7 dBm
You must use a 19 to 24 dB (14 to 28 dB for 15454-OC192-LR2) (20 dB recommended) fiber attenuator
Caution
when connecting a fiber loopback to an OC192 LR/STM64 LH 1550 card. Never connect a direct fiber
loopback. Using fiber loopbacks causes irreparable damage to the card. A transmit-to-receive (Tx-to-Rx)
connection that is not attenuated damages the receiver.
You can install OC192 LR/STM64 LH 1550 cards in Slots 5, 6, 12, and 13 and provision the card as a
drop or span card in a two-fiber or four-fiber BLSR, path protection, ADM (linear) configuration, or as
a regenerator for longer span reaches.
OL-9217-01
Enlarged Section of the OC192 LR/STM64 LH 1550 (15454-OC192-LR2)Faceplate
RX
!
MAX INPUT
POWER LEVEL
-7 dBm
4.16 4.16 OC192 LR/STM64 LH 1550 Card
Cisco ONS 15454 Reference Manual, R7.0.1
4-37