R0106-HP MSR Router Series Interface Command Reference(V7)

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Default
Periodical FEAC channel signal detection is enabled. FEAC signal transmission is disabled.
Views
CT3 interface view
Predefined user roles
network-admin
Parameters
detect: Enables periodical FEAC channel signal detection.
generate: Sends and sends a specific type of FEAC signal.
• ds3-los: Specifies the DS3 LOS signal.
• ds3-ais: Specifies the DS3 AIS signal.
• ds3-oof: Specifies the DS3 OOF signal.
• ds3-idle: Specifies the DS3 idle signal.
• ds3-eqptfail: Specifies DS3 equipment failure signal.
loopback: Sends a specific type of loopback code for activating a specific loopback.
• ds3-line: Specifies far-end line loopback.
• ds3-payload: Specifies payload loopback.
Usage guidelines
FEAC is a channel formed by using the third C-bit in the first subframe in C-bit framing. The channel is
used for the following purposes:
• Transmits alarm state signals for line test
• Transmits loopback control code to activate or deactivate far-end loopback during a loopback test
According to ANSI T1.107a, the framing format of FEAC channels is bit-oriented protocol (BOP).
At the startup of your router, FEAC channel signal detection is enabled on a CT3 interface, but FEAC
signal transmission is disabled.
After far-end loopback is activated by using the feac generate loopback { ds3-line | ds3-payload }
command, you can remove it by using the undo form of the command.
Before you configure far-end loopback by using this command, disable FEAC detection on the local end
to prevent loopback deadlock. Loopback deadlock occurs when the local end enables loopback after
detecting the loopback code sent back by the far end.
To display the transmitting and receiving state of the FEAC channel, use the display controller t3
command.
Examples
# Enable FEAC channel signal detection on T3 2/4/0.
<Sysname> system-view
[Sysname] controller t3 2/4/0
[Sysname-T3 2/4/0] feac detect
# Send DS3 LOS signal on T3 2/4/0.
<Sysname> system-view
[Sysname] controller t3 2/4/0