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- Path: sparky!uunet!hayes!tnixon
- From: tnixon@hayes.com
- Newsgroups: comp.dcom.modems
- Subject: Re: TWO MODEMS ON ONLY ONE TELEPHONE LINE
- Message-ID: <5800.2a6c212e@hayes.com>
- Date: 21 Jul 92 14:37:34 GMT
- References: <1992Jul20.111035.8539@u.washington.edu>
- Organization: Hayes Microcomputer Products, Norcross, GA
- Lines: 52
-
- In article <1992Jul20.111035.8539@u.washington.edu>,
- birnbaum@math.washington.edu (Z.W. Birnbaum) writes:
-
- > I have an office in the same building were I live
- > and I have a terminal with a modem at home and in my
- > my office. Both terminals have a modem (one is Hayes
- > the other Supra), and both modems are connected to the
- > same telephone line.
- >
- > The problem I would like to solve, is to have both
- > terminals active, I mean displaying the same incoming
- > text, at the same time and sending commands to the
- > host computer.
-
- There's no way to do this with full-duplex modems (that transmit
- their carriers continuously); they will always interfere with each
- other.
-
- What you could do is put the two terminals on some kind of sharing
- device on the EIA-232 side of a SINGLE modem. But that would mean
- running an EIA-232 cable from one to the other, which might not be
- possible within the building.
-
- The other suggestion would be to figure out some way to bump the
- other station off the line, if you find you gone home and left the
- office computer connected, or vice-versa. I find that oftentime
- simply going off-hook with a telephone and mashing a few touch-tones
- will confuse one modem or the other enough to cause them to think
- they've lost carrier and hang up. Another alternative would be get
- Call Waiting on the modem phone line, and set your S10 register a
- little bit lower; then, to cause a disconnect, just call the modem
- line from another phone, which will cause a Call Waiting beep and
- thus a disconnection.
-
- Another thing you could do is set up some kind of "inactivity timer"
- so that if the link sits unused for more than a few minutes that it
- will be automatically disconnected. This is a feature of many
- modems, but you could also set it up on the host side or in your PC
- software (some packages). I know, for example, that our Vax here
- will log you off if you don't type anything for several minutes (it
- warns you first).
-
- But, of course, the easiest thing (and the safest, from a security
- point of view) is to just always remember to log off whenever you
- leave your office or home.
-
- --
- Toby Nixon, Principal Engineer | Voice +1-404-840-9200 Telex 401243420
- Hayes Microcomputer Products, Inc. | Fax +1-404-447-0178 CIS 70271,404
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