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UM380 03 010
InterChange iQ 2000 and iQ 2000plus
7.4.5 Loop-Back Testing
Loop-back testing affects services as it takes the unit out of circuit and applies a logical loop
to the TX and RX connections of a port so that input and output lines may be tested. Loop-
back testing is only possible if a terminal can be connected to the InterChange iQ 2000 unit’s
Management
port. To perform a loop-back test:
1 Make sure the lines are connected to the port to be tested. If the port is not
connected a loop-back cable may be connected.
2 In the Diagnostics menu of Vision iQ, select
Loopback
.
3 In the loopback options window, select
Remote loopback
’ and click on
Set.
To remove the loop-back once the fault has been corrected:
1 In the loopback options window, select
Clear loopback
and click on
Set
.
2 Close the Loop-back window.
If a network port fails to come up it may have been disabled by the service provider
at the local exchange. Call the network support number to request re-connection.
7.4.6 Call Failures
Symptom
The status LEDs show no faults but no calls can be made. There may be no indication of
failure from attached equipment.
Diagnostic action
If the attached equipment is indicating a problem, it may be possible to diagnose the fault by
referring to that equipment’s fault finding documentation.
You can also monitor the InterChange iQ 2000 unit's ports in turn using a Primary Rate
signalling protocol analyser. Check that calls are being received into the equipment and are
being passed on to the associated port. If not, and the cause is not obvious from inspection
of the analyser diagnostics, contact your support organisation for further guidance.
Symptom
Calls are dropped unexpectedly while in progress.
Diagnostic action:
The commonest cause is transient transmission problems on the network-side connections.
If a management terminal is available use the Report Port Errors command in Vision iQ to
check whether errors are occurring on either port. Alternatively, request that the network
provider run checks on the connection.