3Com MSR 50, MSR 30 manual Feac CT3 interface view

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Table 21 Description on the fields of the display controller t3 command

Field	Description
Bits received (since latest sync)	Number of bits received since the last synchronization

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-losfor DS3 LOS, ds3-aisfor DS3 AIS,
	ds3-ooffor DS3 out of frame (OOF), ds3-idlefor DS3 idle, and ds3-eqptfailfor
	DS3 equipment failure. By default, FEAC signal sending is disabled.
	loopback: Sends loopback code for activating far-end line loopback with the
	ds3-linekeyword or payload loopback with the ds3-payloadkeyword. 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.