R3102-R3103-HP 6600/HSR6600 Routers Interface Command Reference

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Usage guidelines
FEAC is a channel formed by using the third C-bit in the first subframe in C-bit framing. It is used to
transmit alarm state signals for line test purposes, or to transmit loopback control code for activating or
deactivating far-end loopback during a loopback test.
According to ANSI T1.107a, the frame format used by FEAC channels is bit oriented protocol (BOP).
At the startup of your router, FEAC channel signal detection is enabled on the CT3 interface with FEAC
signal sending disabled.
After far-end loopback is activated with the feac generate loopback { ds3-line | ds3-payload } command,
you may remove it with the undo form of the command.
Disable FEAC detection before you configure far-end loopback to prevent loopback deadlock, which
may happen when the local end enables loopback after detecting the loopback code sent back by the
far end.
You may view the transmitting/receiving state of the FEAC channel by using the display controller t3
command.
Examples
# Enable FEAC channel signal detection on CT3 interface T3 2/0/0.
<Sysname> system-view
[Sysname] controller t3 2/0/0
[Sysname-T3 2/0/0] feac detect
# Send DS3 LOS signal on CT3 interface T3 2/0/0.
<Sysname> system-view
[Sysname] controller t3 2/0/0
[Sysname-T3 2/0/0] feac generate ds3-los
# On CT3 interface T3 2/0/0, send loopback code to the far end to place the far end in a line
loopback.
<Sysname> system-view
[Sysname] controller t3 2/0/0
[Sysname-T3 2/0/0] feac generate loopback ds3-line
frame-format (CT3 interface)
Use frame-format to configure the framing format used by the CT3 interface.
Use undo frame-format to restore the default.
Syntax
frame-format { c-bit | m23 }
undo frame-format
Default
The framing format is C-bit.
Views
CT3 interface view
Default command level
2: System level