Cisco Systems 15530 About Y-Cable Line Card Protection

7-8
Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter7 Configuring APS
About Y-Cable Line Card Protection
Figure 7-4 shows an example of line card protection using ESCON multiplexing line cards and 10-Gbps
ITU trunk cards.
Figure7-4 Client Based Line Card Protection Using ESCON Multiplexing Line Cards and 10-Gbps ITU Trunk Cards
About Y-Cable Line Card Protection
With y-cable protection, the client equipment sends only one signal to two transponder line cards u s i ng
a y-cable to replicate the signal. The client equipment recei v es f rom on ly o ne tran spon der lin e car d. The
Cisco ONS 15530 turns on the laser at the active transparent interface, and turns off the laser on the
standby transparent interface. At each receiver on the trunk side of the transponder line card, the system
monitors the optical signal power level. If the system detects a failure of the active signal when an
acceptable signal exists on the standby transponder line card, a switchover to the standby signal occurs
by turning off the active transmitter at the client interface and turning on the standby transmitter.
10-port ESCON cards 10-Gbps ITU trunk card
ITU trunk card
OADM
modules
West
East
10-Gbps ITU
transceiver
SRC
LRC
LRC
LRC
LRC
79310
Active signal
Optical fiber
connection
Electrical backplane
connection
Standby
switch fabric
connection
Redundant
CPU switch
modules
10-port ESCON cards
10-Gbps
ESCON
switch