3Com SuperStack II PathBuilder S330 Reference Manual page 183

Table 11 T1/E1 UNI with IMA Module Alarms (continued)
Alarm Meaning
Group [n] The near end finds not enough
Insufficient Links available links.
ATM Forum (R-130) This occurs when the near end
has completed parameter
negotiation with the far end,
but is neither passing data nor
blocked.
Group [n] Lack of The near end is idling because
Link it does not have enough links
in an IMA group. This occurs
only after group parameters
are negotiated. When this
occurs, the "NE Insufficient
Links" alarm is also reported.
Group [n] Link Summary information alarm to
Down indicate one or more alarms on
this IMA group are active.
Group [n] Link Up Summary informational alarm
to indicate all alarms on the
IMA group are cleared.
Group [n] N<P There are fewer configured
links than IMA links required to
make an IMA group active.
Group [n] No Link The near end has lost all its
links in an IMA group because
these links have AFA, LOS, AIS,
OOF, LCD, or missing ICP cells.
This invalidates all the far end
identity.
Group [n] Multi Different group IMA ID
IMA ID received on different links in an
IMA group.
Group [n] Multi Test Different test procedure
request from different links in
ATM Forum (R-138)
an IMA group from the far
end.
Group [n] Multiple Different frame lengths
M received on different links in an
IMA group.
Group [n] Multiple Different group symmetry
Symmetry received on different links in an
IMA group (symmetrical versus
asymmetrical operation).
Group [n] Time The far end transmit clocking
Sync Fail mode does not match the near
end transmit clocking mode
IMA Protocol IMA label is not ATM Forum
Mismatch 1.0.
IMA Remote Far end loopback detected,
Loopback external cable loopback or
crosstalk.
(continued)
Managing System Alarms
Troubleshooting Steps
Check and correct any faulty IMA links.
Check and correct IMA minimum links
parameter.
Take the group down, and stop passing
data in all links.
Information only.
Information only.
Continue passing data.
If one or more links comes back,
re-identify the link(s) and renegotiate
parameters with the far end group.
Correct link connections and/or IMA
group configuration.
Use the test procedure from the lowest
logical link and ignore the other test
procedures.
Make sure that the IMA frame length is
set to the same value for all links.
Configure the group to be symmetric.
3Com PathBuilder switches do not
support asymmetric bandwidth for
IMA.
Check configuration. Only CTC
(Common Transfer Clock) is supported.
If the far end transport clocking is set to
ITC (Independent Transfer Clock),
change it to CTC.
Near end and far end IMA protocol
versions do no match. Check and
correct incompatibility.
Remove loopback condition.
173