Connectingto RAD Via Modem

[commsguy]

Does anyone have any experience connecting to a FastRAD via modem? Specifically, my FastRad is not providing DTR. Also, when I force DTR override, the FastRAD does not respond.

Any help or samle configs would be greatly appreciated.

Thanks.

 

[hdingman]

Does your RAD have the built-in modem? Call it from an outside line and transfer the line to the extension port it's connected to. See if it answers with modem tone. A lot easier than trying to do an external modem.

Regards, Howard Dingman
Pro-Tel Communications
Endicott, NY 13760
mailto:hdingman@holocom.com

 

[commsguy]

The KSU is not online yet. I am waiting for the T1s to go live. When I called the extension from another extension, there was no answer.
It looks like the modem i was using MAY have been the issue but i haven't had time to completely resolve this issueas of yet.

Thanks for the reply.

 

[hdingman]

Only T1 or are you going to have some POTS lines? If you can, try from an outside CO line, it might make a difference. Also, if you can get your hands on an OLD external modem (9600 or slower) it's easier to get it to talk. They turn up in garage sales once in a while. You can also use AT&N and AT&U to slow the modem down, but most 56K modems don't seem to like to slow down to 9600 or below.

hd Howard Dingman
Pro-Tel Communications
Endicott, NY 13760
mailto:hdingman@holocom.com

 

[commsguy]

T1 lines only. If I am not getting DTR from the RAD, nothing else is going to happen. Modems do not negotiate speeds until DTR is present

 

[hdingman]

Try connecting the modem to a PC and send it
ATS0=1&D0&Q0&N1&U6
AT&W
Then connect it to the RAD and see what happens.
According to intel, this may make it work with
DCE that does not produce DTR (&D0&Q0)
It also sets negotiation rates to 300-9600 baud.
If the "AA" light comes on, you may be in luck.

Check out

http://www.vrx.net/richard/modems/Intel_14.4_PCMCIA_cmds.html

or

http://www.modem-help.freeserve.co.uk/download/texas_instruments.pdf

for good depth on AT commands.

Of course, not all commands will work with all modems.

Regards, Howard Dingman
Pro-Tel Communications
Endicott, NY 13760
mailto:hdingman@holocom.com