3Com S330 Alarms Common to Several Interfaces, Alarms Common to Several Modules, Alarm Meaning

Managing System Alarms 169

Alarms Common to Several Interfaces

Table 27 describes major alarms common to several PathBuilder S330/S310 interfaces.

Table 27 Alarms Common to Several Modules

Alarm Meaning Troubleshooting Steps

Alarm Indication	An incoming alarm indication
Signal(AIS)	signal (AIS) indicates a LOS
	problem is occurring on the
	line upstream of the
	equipment connected to this
	port.

Check your locally connected DS3/E3/OC3 equipment, or ask your service provider to trace the source of the AIS signal.

Far End Receive	The far end equipment has a
Failure	problem with the signal it is
	receiving from the PathBuilder
	device.

Check for a defective cable between the PathBuilder device network interface port and your service provider’s network interface unit. An open transmit line can cause this condition. Check the LBO setting of the port.

FEAC Loopback	A DS3 overhead function that
	allows the system to be
	enabled or disabled for
	responding to Far End Alarm
	Condition commands from the
	central office. When enabled,
	the DS3 line loopback is put up
	upon instruction from the
	central office. The system
	removes the loopback upon
	instruction or after 15 minutes.
Idle Signal	The line has not been
	provisioned for service. No data
	will pass on a line with an idle
	signal.
In Band Loopback	A loopback is configured on
	the port. Loopbacks are for
	troubleshooting only and
	should not be present under
	normal operating conditions.

Check with your service provider to determine the reason for the loopback.

Check the configuration of the terminal equipment, or have your service provider check their equipment and make sure it is provisioned for service.

If you are not troubleshooting the port, turn off the loopback.

Link Down	Summary informational alarm	Information only.
	to indicate one or more alarms
	on this link are active.
Link Up	Summary informational alarm	Information only.
	to indicate all alarms on the
	physical link are cleared.

Local Card	A loopback is configured on
Loopback	the port. Loopbacks are for
	troubleshooting only and
	should not be present under
	normal operating conditions.

If you are not troubleshooting the port, turn off the loopback.

Loss of Cell	Loss of cell
Delineation(LOCD)	delineation—possibly a
	framing or timing problem.
(continued)

Check the reference clock source. Compare parameters between local and service provider end. Check the physical layer.