Codec acting up when connected to ISDN or IP network

[sidhu]

Our Tandberg 6000 is acting up funny. When connected to the ISDN network, the system name, My ISDN number, and MY IP number on the main Tandberg menu start blinking. When I press Menu from the remote control, all menus are working fine except System Info. When I select System Info, all information in this menu is blinking. If I disconnect all ISDN lines, everything looks fine that is nothing is blinking on the screen.

If I connect the codec to IP network while still connected to ISDN, the codec reboots itself. As soon as the network cable is connected to the Ethernet port at the back of the codec, the Triple NT-1 device indicators start flashing.

When a call is connected via ISDN, our image is slow and jerky sometimes we get error message "Corrupt Data received. Re-establishing a call"

Had anyone experience similar problem.

[robertk]

This sounds serious.

The flashing of the ISDN number and IP number could indicate that the codec loose sync with the ISDN network. I would suspect a problem with the ISDN network.

1: Is this a new problem, or has it been like this forever. Did it work well before? Any problems with bad cables?
2: You can connect the codec(isdn1) to only one ISDN line at the time and try to see if you can locate a bad NT-1 box. Try dialing a 128K call from each ISDN, is anyone working ok? Do you get the same behaviour regardless of wich line you have connected?

3: Have you checked the ISDN with your provider? Have they had a technichan on site to thest the NT-1 boxes?
Try everything without IP connected, IF something seams to work better then before, then try to connect the IP and see if it reboots.


//Robert

[sidhu]

This is a new problem. Our equipment was working fine before. It does not matter which line is connected we get the same problem. We tried to make few test calls, remote sites can not see our video when connected at 384kbps, at 256kbps our video is slow and jerky, at 128 kbps it seems to be working a bit better.

[robertk]

OK.

It really sounds like iSDN problems :)

Did you do the test where you connected only ISDN1 from the codec to each ISDN line and make a 128K call for each ISDN box?

//Robert

[sidhu]

I tested with different lines and found the problem was with ISDN network. Also, I discovered today that when the codec is connected to both ISDN and LAN and I make ISDN call, video from our end freezes up and takes long time to show the motion on screen. If I unplug the codec from LAN then ISDN call works fine.

I can still make IP calls. If the codec is connected to both ISDN and IP network, I have to force the call to either IP or ISDN instead of leaving it at Auto.