IPA function is implemented by various boards with different functions.
Fiber Break Detection
After IPA is configured, the detection board and auxiliary detection boards involved in the IPA determine whether a fiber break occurs by detecting for the relevant alarms.
Laser Shutdown
Upon detection of a fiber break, the optical amplifier at the fiber break point is shut down to prevent the intensive optical power from injuring the maintenance personnel.
Laser Restart
After the line configured with IPA is restored, the laser of control implementation board is started again.
Related Boards
This section describes the involved units of IPA function.