3Com 3C63400-3AC-C - PathBuilder S700 Switch Reference Manual page 226

212 C 6: P B
HAPTER ATH UILDER
S700 D P
IAGNOSTICS AND ERFORMANCE
Table 42 Alarms Common to Several Modules (continued)
Alarm Meaning
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.
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) AIS alarm is detected. 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.
M
ONITORING
Troubleshooting Steps
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.
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.