PBX Admin

I currently have standalone G3si out in one of my Sales offices. There is an IP Trunk between the G3si and one of my EPNs at another area location which is how 5 digit dialing is passed. In the G3si, (Location A) there is a TN799C clan board which acts as the near end point. The far end connection is at TN799DP (Location B). Currently, at the location A, we are experiencing sporadic dropped calls. Had avaya take a look and they couldn't find any trouble. Though with the tech, i found that the TN799DP at Location B is set to 10/half. Usually with IP trunking, you would want to have it set to 100 full, but they advised the reason most likely it was set to 10/half is because the TN799C at location A which is experiencing the dropped calls can only handle 10/half. Is this a true statement? I'm wondering if the cause of the dropped call issue at Location A is because of this setting. The location is growing big time, so call volume is increasing pretty rapidly. I am getting a intermettent alarm on the TN799DP at location B, but the board is testing just fine. Going to replace it anyway, but was wondering about this TN799C/DP settings. If anyone could provide assistance, I would appreciate it.

martinyoung

You do not indicate what the software release is at any of these locations so I cannot be specific. Older release software will only run at 10/half. If one end is 10/half it makes no sense to run the other end at 100/full, you are still limited to 10/half.

I would set both CLANs to 10/half and also lock the router ports they connect to at that speed too, no autosensing anywhere. That should stabilize the connection.

__________________
Marty
Retired Avaya DSIC tech

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PBX Admin

The software release on the G3si is V9, and the G34 would be V11. Both ports are set right now to 10/half. I was told earlier by my counterpart that the backplane cabling can only support 10/half on the EPN. The EPN at location B is an SRP. Is it true though that the TN799C can only support 10/half?

martinyoung

You are limited to 10/half by several factors.

The V9 software in the G3si will only support 10/half. That will have to be upgraded and the only upgrade available is to the latest product. For a G3si that is an S8500. The EPN is ok with V11.

The TN799C runs at 10/half. You can replace it with a TN799DP but in a V9 PBX it will still only run at 10/half.

If either of the Ethernet adapters is the gray one (rather than the black one), you are limited to 10/half.

The backplane cabling at the EPN is a factor. Open the back door of the EPN and look at the cable that runs from the backplane to the amphenol connector. If the leads are white with a couple of red ones, 10/half is the limit. If it is multicolored like a 25 pair cable, you have two possibilities. If the leads are straight, it is still 10/half. If the pairs are tightly twisted around themselves then it is cat5 and will support 100/full. That cable can be replaced if it is only a cat3 by a cat5 cable but that does not gain you anything because of the limitations at the far end.

One last detail that you did not mention, what version of V9 is the G3si? Is it 9.2 or 9.5? If it is a 9.2 you will always have problems with IP trunking. The oldest release that Avaya will support for IP anything is 9.5.

__________________
Marty
Retired Avaya DSIC tech