Tandberg 3000MXP Rev. F6.2 in ISDN

[Nelson Perez]

:ermm: Codec repeatedly reboots when powered ON with the ISDN circuits connected to the codec. If powered on with only one circuit connected the codec powers ON OK If a 2nd ISDN circuit is introduced, the codec begins to repeatedly reboot.
The ISDN circuits are provided from an Avaya PBX and a 52V reading has been detected on the all three circuits. Is that the correct value for ISDN? We believe the problem is externally introduced, but have no way of proving it since the customer has three equally optioned 3000MXP units, all REV. F6.2 and are all installed in the same location, and serviced from the same Avaya PBX. Yet one of the three units works fine.
Can anyone shead some light on this issue? What troubleshooting technque can be recommended to prove our point?

[Shawn Jones]

:ermm: Codec repeatedly reboots when powered ON with the ISDN circuits connected to the codec. If powered on with only one circuit connected the codec powers ON OK If a 2nd ISDN circuit is introduced, the codec begins to repeatedly reboot.
The ISDN circuits are provided from an Avaya PBX and a 52V reading has been detected on the all three circuits. Is that the correct value for ISDN? We believe the problem is externally introduced, but have no way of proving it since the customer has three equally optioned 3000MXP units, all REV. F6.2 and are all installed in the same location, and serviced from the same Avaya PBX. Yet one of the three units works fine.
Can anyone shead some light on this issue? What troubleshooting technque can be recommended to prove our point?

Verify that the only thing on those lines are the BRI you want there.

I have had an issue where I had a building wired so that the unit could be moved to several rooms, had an issue close to something like this, and found that someone thought it would be cool if they ran a patch cable from the BRI to the LAN jack.

Can they patch one of the working triple BRI's to the unit you are having issues with, then test? This would eliminate the possibility of the unit having an issue.

Do you have a NT box between the circuit and the endpoint?
What does it read when the circuits are plugged in?
Have you tried a different NT box?

Let us know what you find out.