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SDH Switching causes AS5400 E1 controllers flapping.

We have 3 AS5400 HPX and 1 AS5400 XM. These devices are used as voice Media Gateway and connected to an SDH transport network via 8 port E1 DFC card.

Links fluctuate continuously whenever there is a switching on SDH backbone. Ideally the router should never see the SDH switching because the switching time would be very small, less than 50ms and it verified with specific instrumentation:

sdh_swith_time.jpg

During SDH switching, the router E1 controller goes down for 1 second and the voice calls are dropped. The router shows always 5 SES but only 1 SES happens:

e1_error.jpg

During SDH switching, the ADM sends a very fast AIS alarm for about 100 ms but it is normal in this situation.

e1_alarm.jpg

This is the E1 controller configuration:

controller E1 7/0

framing NO-CRC4

channel-group 15 timeslots 16

ds0-group 0 timeslots 1-15,17-31 type none service mgcp

show controller:

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 5 Severely Err Secs, 0 Unavail Secs

We have already try to set every parameters without success (framing, linecode, impedance, cable lenght, etc).

Do you have any idea?

Regards.

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