3Com S330 manual Line, or the port configuration

170CHAPTER 5: PATHBUILDER S330 DIAGNOSTICS AND PERFORMANCE STATISTICS

Table 27 Alarms Common to Several Modules (continued)

Alarm Meaning Troubleshooting Steps

Loss of Signal(LOS) Cannot detect a signal at a configured port. This alarm is applicable to DS3 UNI, E3 UNI, OC3/STM-1 UNI, DS1 IMA UNI, and E1 IMA UNI ports.

Check the cable between the interface port and the service provider’s equipment/terminal equipment. Check cable connections. Check transmit and receive pairs for proper connection. Check terminating equipment. Call your service provider.

Network Card	A loopback is configured on
Loopback	the port. Loopbacks are for
	troubleshooting only and
	should not be present under
	normal operating conditions.
Network Line	A loopback is configured on
Loopback	the port. Loopbacks are for
	troubleshooting only and
	should not be present under
	normal operating conditions.
Out of Frame(OOF)	The configuration settings on
	the port are not correct for the
	line, or the port configuration
	is correct, but the line is
	experiencing errors that result
	in an alarm.

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

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

Verify that the framing format configured on the port matches the framing format on the line. Check the port’s statistics report for evidence of a bad line; bursts of LCVs could indicate a timing problem. If connected to local DS3/E3/OC3 equipment, check that equipment’s output level to make sure it is not overdriving the input.