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Brooktrout CAC Channel Bank FXS
#26331 10/09/11 04:06 PM
Joined: Apr 2011
Posts: 5
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Joined: Apr 2011
Posts: 5
Hello, I am trying to use a pc with a Brooktrout Tr1034 T1 fax card to generate fax traffic. This is a 24 channel fax/voice T1 adapter. At the other end, I have a CAC channel bank "1" with 24 FXS ports. The Brooktrout is connected the the CAC with a crossover cable. The CAC has 24 analog fax modems connected to it. There are no timing or framing error leds on the CAC. I have tested Brooktrout to Brooktrout )all 24 channels) sending and receiving, no issues. I have tested 24 analog Localfax modems to 24 analog fax modems, sending and recieving, no problems. The Natural Data Localfax modem is a special fax modem that provides battery feed, dial tone and ringing (CO emulation).

Here's the rub: Brooktrout to CAC to 24 modems does not work. Brookrrout complains that there is "no dial tone" and quits. When I plug a regular POTS line phone into any of the CAC ports, there is no dial tone. When I push the digitits on the dial pad, I hear tones.When I put the phone "on hook" it rings constantly until I take it off hook. I have tried every combination I could think off. RBS and ISDN signalling, ground start and loop start etc. etc.

What am I doing wrong or not doing?

Any help or guidance will be greatly appreciated.
Best Regards

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Re: Brooktrout CAC Channel Bank FXS
#26332 10/09/11 04:20 PM
Joined: Dec 2005
Posts: 8,534
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The signaling for each of the 24 channels should be set up as Loop Start on both ends. What I think is happening is that either something is mis-optioned or the signaling bits being generated by the PC/Brooktrout is incorrect even though the system may say Loop Start. Thus, when you connect a single line telephone, it starts to ring.....because the channelbank is seeing 2 or 4 1's....which causes it to send a ringing signal to the phone.

Take a look at chart locted under "CAS Signaling Types" at the following page :


Moderated by  MooreTel, Professor Shadow, skip555 

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