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feac (CT3 interface view)
Syntax feac { detect | generate { ds3-los | ds3-ais | ds3-oof | ds3-idle | ds3-eqptfail |
loopback { ds3-line | ds3-payload }}}
undo feac { detect | generate { ds3-los | ds3-ais | ds3-oof | ds3-idle | ds3-eqptfail |
loopback { ds3-line | ds3-payload }}}
View CT3 interface view
Parameter detect: Enables periodical far end and control signal (FEAC) channel signal
detection. By default, periodical FEAC channel signal detection is enabled.
generate: Sends FEAC signals. Specify ds3-los for DS3 LOS, ds3-ais for DS3 AIS,
ds3-oof for DS3 out of frame (OOF), ds3-idle for DS3 idle, and ds3-eqptfail for
DS3 equipment failure. By default, FEAC signal sending is disabled.
loopback: Sends loopback code for activating far-end line loopback with the
ds3-line keyword or payload loopback with the ds3-payload keyword. By
default, loopback code sending is disabled.
Description Use the
feac command to enable FEAC channel signal detection and sending on
the CT3 interface.
Use the
undo feac command to remove the current FEAC settings.
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 purpose 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.
n
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 with the
display controller t3 command.
Bits received (since latest sync) Number of bits received since the last synchronization
Table 21 Description on the fields of the display controller t3 command
Field Description