ZyXEL Communications MSC1024G Series User Manual page 977

1 Make sure all physical connections between your TDM network and your IMA devices
are connected properly. (Refer to
are using correct E1 wires and have your Tx connect to the Rx wire from the TDM
network and your Rx connect to the Tx wire from the TDM network.
2 Make sure the TDM network is running well. You may need to contact the operator or
administrator who can help you check the TDM network status.
3 Check the IMA group Ne State and Fe State in the Statistics > IMA > slot > group >
screen. If both of them are NOT "operational", do the following:
• Make sure that you have enabled the E1 port(s) and IMA group(s).
• Make sure that E1 port(s), IMA group(s) settings are configured properly and match
the settings configured on the peer IMA device. Refer to
configuration example.
• Make sure that IMA PVC, DTPVC and/or MGTPVC settings are configured properly
and match the settings configured on the peer IMA device.
The following table summerizes some cases according to the combination of Ne/Fe
states and the possible root causes.
Table 353 Common Causes of IMA Connection Problems
GROUP NE
STATE
startUp
blocked
operational
insufficientLinks
insufficientLinks
configAbortOther configAbortUnsu
configAbortOther configAbortInco
MSC1000G/1024G/1224G Series User's Guide
IMA Application
GROUP FE GROUP FAILURE
STATE STATE
not Configured otherFailure
blocked blockedNe
blocked blockedFe
insufficientLinks insufficientLinksNe
not Cofnigured insufficientLinksNe
unknown
pportedImaVersi
on
failedAssymetricFe
mpatibleSymmet
ry
Chapter 39 Troubleshooting
on page 45.) This includes that you
Section 4.3 on page 84
POSSIBLE ROOT CAUSE
The IMA group on the remote IMA device
does not exist.
The IMA group on the local IMA device is
disabled.
The IMA group on the remote IMA device
is disabled.
One IMA link is down and that causes the
local IMA device to not have the number of
links (configured in IMA > Group) to move
to the operational state.
• One or multiple E1 ports related to the
links in the IMA group are disabled and
that causes the local IMA device to not
have the number of links (configured in
IMA > Group) to move to the
operational state.
• One or both Tx and Rx links are
unavailable
The IMA group versions configured on
both peers do not match.
The symmetry modes configured on both
peers do not match.
for a
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