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Managing System Alarms

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DS3 reference clock
failure

Interface clock has been designated as the system clock, and the
interface clock has failed.

Loss of clock

Reference clock has failed

OC3 reference clock
failure

Interface clock has been designated as the system clock, and the
interface clock has failed.

E3 reference clock
failure

Interface clock has been designated as the system clock, and the
interface clock has failed.

System power up

System is powered up.

Loss of IMA frame (LIF)

Mismatch between 2 ends of the circuit on IMA frame size. Can be
caused by missing ICP cells (ATM cells that carry protocol
information), bad IMA ID, bad sequence number, bad M, bad offset
HEC error or CRC error in ICP cell. This problem may occur if the link
gets noisy and there is no AFA to prevent the ICP from getting
corrupted. It is detected in hardware and may or may not cause an
operational problem.

Loss of differential
synchronization (LODS)

Relative time difference between individual T1s/E1s in the IMA
group is out of range.

LODS is declared after the Rx IMA fails to synchronize the IMA link(s)
in an IMA group within some time limit.

Duplicated IMA ID

An IMA group has received an IMA ID that has been received by a
previous group. The 2nd group must have a unique ID.

Bad IMA ID

When you enable the group, the system assigns a unique group ID
for the local and remote end of the IMA configuration. This alarm is
received if a link within the group has received an IMA ID other than
that assigned to the group. The link with the BAD IMA ID is
probably misconnected.

Bad M

The maximum value for the serial card on the local device must
match the maximum value for the frame size of the connected
device. The link with the BAD M is probably misconnected.

Duplicate link ID

Each IMA group assigns a unique Transmit link ID to each link in the
group that should match the Receive link ID of the remote end IMA
device. This alarm means that a link received a Transmit link ID
already assigned to a previous link.

Duplicated offset

Duplicated far end ICP cell offset in this IMA group in an IMA link.

Each IMA group assigns a unique Transmit offset to each link in the
group. This alarm means that a link received a Transmit offset
already assigned to a previous link. Some of the links are probably
misconnected.

Test pattern failed

An 8 bit pattern is sent to the remote node which must then echo it
back on all ports. The local node checks the echoed pattern and
reports and alarm if cells from one or more of the links fail to arrive.
This alarm is declared on all links which don’t reply or reply
incorrectly. Some links may be misconnected.

Bad Link ID

Each IMA group assigns a unique Transmit link ID to each link in the
group that should match the Receive link ID of the remote end IMA
device. This alarm means that a link was operating correctly, but
then received a Transmit link ID already assigned to a previous link.

TX Misconnected alarm is also generated.

(continued)

Table 36

PathBuilder S600 Alarm Messages (continued)

Alarm

Definition