5-15
Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter5 Configuring Transponder L ine Card Interfaces
About Laser Shutdown
About Laser Safety Control
The Cisco ONS 15530 allows you to enable laser safety control on the trunk side interfaces of the
transponder line cards. Much like OFC, the laser safety control protocol shut s down the transponder line
card laser transmitting to the trunk when a fiber cut occurs or when the trunk fiber is detached from the
shelf (see Figure 5-3).
Figure 5-3 Laser Safety Control Overview
Laser safety control uses the same protocol state machine as OFC, but not the same timing. L aser sa fety
control uses the pulse interval and pulse duration timers compliant with the ALS (automatic laser
shutdown) standard (ITU-T G.664).
Use laser safety control with line card protected and unprotected configurations only . Enable laser saf ety
control on all wave interfaces, including the OSC.
Caution Laser safety control can interrupt signal transmission with splitter protected configurations. If you
configure the system with splitter protection and enable laser safety control, the transmit laser to the
client shuts down when an open fiber occurs on one transport fiber and signal transmission to the
client is interrupted.
Laser shuts down
Open fiber detected
Client side Trunk side
Transponder line card
Tx
Rx
Transmit laser
Transmit laser
Receiver
Receiver
79775