home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
- Date: Sun, 13 Sep 92 05:50:02 EDT
- From: morpheus@entropy.mcds.com (morpheus)
- Newsgroups: comp.dcom.telecom
- Subject: Re: Information Wanted on CPC Pulses
- Message-ID: <telecom12.706.11@eecs.nwu.edu>
- Organization: TELECOM Digest
- Sender: Telecom@eecs.nwu.edu
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 12, Issue 706, Message 11 of 13
- Lines: 30
-
- stevef@wrq.com (Steve Forrette) writes:
-
- > Here's a question of my own: Are there any modems that detect the CPC
- > signal? A common problem with our Hayes Ultra 9600's that we have for
- > dialup are that if the 9600 bps negotiation fails for some reason such
- > that "NO CARRIER" is returned instead of a fallback to 2400, the modem
- > at the host end is apparently still trying to negotiate, and remains
- > offhook for another 30-45 seconds. This means that if you immediately
- > retry the connection, you get a busy signal. It would be nice to have
- > the modem immediately reset when it sees the CPC indicating that the
- > caller has gone away. I've never seen this in any modem (not that
- > I've looked very hard), and wonder why it is not a standard feature.
- > It would seem to me that detecting loss of loop current would not be
- > an expensive feature to engineer. And if a line doesn't give CPC,
- > then the modem would act as it does now anyway.
-
- I *believe* US Robotics modems do this. My Dual Standard (sup v 3.0)
- seems to. If I call the modem and wait until it picks up before
- hanging up the telephone, the modem instantly reports "NO CARRIER".
-
- All in all, I must say I have found the US Robotics modems to be of
- very high quality. Things like touch-tone decoding and MI/MIC appeal
- to the hacker in me ;-) (now just if it did A/A1 closure!).
-
- No, I don't work for 'em.
-
-
- morpheus@entropy.mcds.com /\/\/\/ morpheus@f208.n2606.z1.fidonet.org
-
-