Question about Adtran ISU 512 Multiplexer

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I have a ADTRAN 512 modem in use with a Tandenberg VTC terminal. It has (3) single pair (U Interface) ISDN BRI lines feeding it. From the Nortel PBX switch, those lines are two 64K bearer channels each, totalling 128 x 3 = 384 Kbps. When dialing into any of the (6) SPID's, it will try to bond for the 384, but will not go above a single 64K. I have verified modem setup, Tandenberg setup, and PBX setup. All appear to be correct. I am even able to do video both ways, and stay connected, but only at 64K. My question may be more of a trouble isolation one, than the root of the problem, but ultimately need to arrive at both answers. I manage the telephone switch, normally verifying that part, and leave the other part to the outside folks. In this case, there is noone to leave it to, so I am trouble shooting the whole picture. I cannot find anything in the telephone switch that is responsible for bonding. I am pretty sure that bonding has to take place at the ADTRAN level, and not the phone switch, or Tandenburg equipment. Can you confirm, or deny that? It's, of course possible that we have a bad modem. We did try a second one, but I am not sure we ran the same tests. So far as I am aware, the PBX simply supplies the (3) DSL U Interface lines, at 128Kbps each line, and it is up to the ADTRAN to add up those channels during bonding. If you can think of any other things to check, I would apreciate your input. The ADTRAN is setup for 384K bonding, and 6 channels.

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SOURCE: front panel dialing

You need to check in the 'network options', 'dial line', #4 'dial options' to see if you have the front panel function enabled.

As for not being able to call ISDN in the US, that is a possible routing or long distance service issue you need to have looked at by your service provider.

Posted on Jan 06, 2009

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The Atlas 550 is modular, and can break out the 23 channels as BRI or FXS. Since you want 23 analog lines, I presume you want regular 2-wire phone lines (aka, FXS lines). The you that by using 3 "Octal FXS" modules (8 port modules) in addition to the T1 module.

Read more here: http://www.adtran.com/web/appmanager/portal/Adtran?_nfpb=true&partNumber=1200305E2

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We have a Nortel Networks T24 phone with multiple lines on it and 2 of them are showing like it's in use but no one are using them. I will like to know if there's a way to cancel them.


This will usually happen if you either

1) Have not set disconnect supervision
2) Have telephone company lines that do not support disconnect supervision
3) Both

The easiest quick fix is to reboot the PBX.

The long term fix is to set disconnect supervision on the PBX for all of the lines and make sure that the lines form the phone company are set to provide disconnect supervision.

The exact way to set it up on the PBX varies by PBX.

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What does QUAD BRI stand for?


It means that there are four ISDN BRI S/T interfaces on the device. Each BRI line contains two phone numbers at 64Kbps of bandwidth each so the Quad BRI would supply 128Kbps x 4 or 512Kbps of bandwidth.

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NEC mother board


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1) The board for a model of the NEC IP28X/400 ISDN BRI with three 16-channel WAN interface modules. (With or without the modules.)

3) The board from a later model similar to the IP28X/400, but which has available a single-slot 48-channel module. (With or without the module.)

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The only phone system that I remember where all 25 pairs are used is a 1a2 10 button set and, maybe a Comdial system where the 25th pair is the common audible for station 17 :-)

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Hey Tony - Did you recently hook this up to the DSL for the first time? This unit is supposedly not able to work with a DSL line.

The fax modem in your AIO is an analog device and cannot be used on an ISDN, DSL, or PBX digital phone service. However, you can connect certain devices to your AIO that let you use the fax function in addition to these digital phone services.

To connect without an unsupported line:
Connect an active telephone cable from the AIO to the telephone wall jack.

To connect with an unsupported line:
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For more help and to request an R-interface port, contact the ISDN provider.
If you use a DSL (Digital Subscriber Line) phone service, you can connect to a DSL filter or router that will allow for some analog (rather than digital) use.
If you use a PBX phone service, you can install an analog phone line for a fax machine.

If this was working on the DSL let me know. I don't know the location but obviously a separate phone jack is the easiest. Let me know. If this helps you fix it you can rate this as fixed. If you are just going to rate this as helpful I'd rather you please not rate it and just add a comment and say thanks for the info.
If you need more help just add a comment and I'll be glad to assist you further. Thanks.

Jeff

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Could not receive and send Fax


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The Ricoh spc210sf isn't supporting an pbx on isdn line!! Watch out for this because the isdn line is working on 24Volts!! Then you can blow youre fax modem of the spc210sf .

You can contact me true email= r.trip@alice.nl
Let me know is you encounter new problems?

Greetz

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Front panel dialing


You need to check in the 'network options', 'dial line', #4 'dial options' to see if you have the front panel function enabled.

As for not being able to call ISDN in the US, that is a possible routing or long distance service issue you need to have looked at by your service provider.

Oct 16, 2007 | Adtran ISU 512 Multiplexer

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