3Com 3C63311 - SuperStack II PathBuilder S310 Bridge/router, Справочное руководство, Страница: 181 / 262

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
Signal(AIS) An incoming alarm indication
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
Failure The far end equipment has a
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. Check with your service provider to
determine the reason for the loopback.
Idle Signal The line has not been
provisioned for service. No data
will pass on a line with an idle
signal. Check the configuration of the terminal
equipment, or have your service
provider check their equipment and
make sure it is provisioned for service.
In Band Loopback A loopback is configured on
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.
Link Down Summary informational alarm
to indicate one or more alarms
on this link are active. Information only.
Link Up Summary informational alarm
to indicate all alarms on the
physical link are cleared. Information only.
Local Card
Loopback A loopback is configured on
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
Delineation(LOCD) Loss of cell
delineation—possibly a
framing or timing problem. Check the reference clock source.
Compare parameters between local
and service provider end. Check the
physical layer.
(continued)