3com MSR 20-20 참조 매뉴얼

alarm { detect | generate { ais | febe | idle | rai } }

undo alarm { detect | generate { ais | febe | idle | rai } }

CT3 interface view

detect: Enables/disables periodical alarm signal detection. By default, periodical 
alarm detection is enabled.

generate: Sends alarm signals, which can be AIS, RAI, idle, or FEBE for line state 
test. By default, alarm signal sending is disabled.

ais: Alarm indication signal.

febe: Far end block error signal.

idle: Idle signal.

rai: Remote alarm indication signal.

Use the alarm command to enable the CT3 interface to detect/send alarm 
signals.

Use the undo alarm command to remove the alarm signal detection/sending 
setting.

At the startup of your device, periodical alarm signal detection is enabled on the 
CT3 interface. When detecting LOS, LOF, or AIS signals, the interface sends RAI 
signals to its peer. Alarm state report for the interface is real time; you may view 
that by performing the display controller t3 command.

The supported alarm signals, LOS, LOF, AIS, RAI, FEBE, and idle, are ANSI 
T1.107-1995 compliant.

You can only configure the CT3 interface to send a type of alarm signal. To have 
the interface send another type of signal, use the undo alarm command to 
remove the previous setting first. In addition, when the RAI signal generated upon 
detection of the LOS, LOF, or AIS signal is present, the CT3 interface cannot send 
another type of signal. To do that, use the undo alarm detect command to 
disable the CT3 interface to send the RAI signal generated after detecting an 
alarm first.