You may be experiencing a timing glitch due to the new 2742 cards.
Your ICF program (through the 2742) raises the OH (Off hook) signal when
it is ready to answer or initiate a call. The modem is supposed to raise
the CD (carrier detect) signal when it finds a dial tone. If you haven't
allowed enough time for this to happen, the 2742 or your program is
throwing the message. The old 2742's may have just been slow enough in
this turn-around that the settings didn't matter. You'll have to dig up
the documentation on how to set this. It will be in the same set up where
you set the maximum allowable RTS-CTS delay (Request to Send, Clear to
Send).
It's been a long time since I did RS232; kind of nostalgic.
Dan
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
franz400@xxxxxxxxxxxx
Sent: Wednesday, April 09, 2008 10:54 AM
To: midrange-l@xxxxxxxxxxxx
Subject: new system and external dial modems
Too many changes at once...
Moved from old 720 to new 525.
Relocated data center at same time.
Dial phone lines at old site were managed by NEC pbx, 2 lines from a T1.
New Data center gave us 2 - AT&T lines.
Same Motorola 3260 modems, same comm config (but newer 2742 feature
cards).
Problem is now approx 20-30 calls a day get a "no carrier" (out of perhaps
800-1000).
No code changes in 7 years.
Every dial starts with a vary on, call icf pgm, dial, comm, end pgm, vary
off.
It has been suggested the NEC pbx must have managed the hangup better.
I know there must be a few dialers still out there.
Any suggestions.
Jim Franz
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