ho@hoss.unl.edu (Tiny Bubbles...) (01/23/91)
A couple of questions. The first one should be relatively easy:
Is the Practical Peripherals 9600SA any good? Does it adhere
well to V.32 standards? Is it reliable? Protocol bugs? These things
are getting fairly cheap (under $500, anyway) and I'm tempted. But if
they're trash, no dice.
I'm a happy owner of a PP2400SA, so I know about warranties and
such already. Any news relative to the 9600 would be appreciated in
e-mail. (I searched back for articles, but found none. I'm still
expecting that it's been beaten into the ground in the past.)
Question two: more techie.
I have cancellable call waiting; if I dial *70 before a call,
it is immune to the little "beeps." Currently, I have one of the S-
registers on the modem programmed to hang up as soon as it gets a beep,
thus killing the data connection and letting the voice call ring through.
If I have an important or expensive data connection, I just have the
computer dial *70 for me before the call.
Obviously, this is useless under V.32 (what, line noise? let's
ignore it and ask for a retransmit). But if I have a "normal" line
(no MNP, no LAPM, no V.32), can I still maintain my relative "voice higher
than data" priority? Does that S-register do its stuff if the correction
protocols are disabled?
I know, this means I have to drop to 2400. But in many cases, I
need to be taking care of minor stuff on the campus mainframe while
awaiting a call, and the ability to have voice calls ring through is
important to me. Is it possible to keep it if I purchase a 9600 baud
modem?
--
... Michael Ho, University of Nebraska
Internet: ho@hoss.unl.edu | "Mine... is the last voice that you will ever hear."
Disclaimer: Peons don't speak for bigwigs.tnixon@hayes.uucp (01/24/91)
In article <1991Jan23.015246.3728@hoss.unl.edu>, ho@hoss.unl.edu (Tiny Bubbles...) writes: > I have cancellable call waiting; if I dial *70 before a call, > it is immune to the little "beeps." Currently, I have one of the S- > registers on the modem programmed to hang up as soon as it gets a beep, > thus killing the data connection and letting the voice call ring through. > If I have an important or expensive data connection, I just have the > computer dial *70 for me before the call. > > Obviously, this is useless under V.32 (what, line noise? let's > ignore it and ask for a retransmit). But if I have a "normal" line > (no MNP, no LAPM, no V.32), can I still maintain my relative "voice higher > than data" priority? Does that S-register do its stuff if the correction > protocols are disabled? Perhaps you're talking about V.42 (error control) rather than V.32 (modulation). A V.32 modem may, in fact, disconnect on a call waiting beep -- depends upon the implementation. The process controlled by S9/S10 (detection of carrier loss) operates independently of V.42 or MNP error control -- if you have error control active and the underlying modem detects loss of carrier, the call is terminated, pure and simple. The best thing you can do is TRY IT. I'll bet that most V.32 modems will, if S9/S10 are set accordingly, disconnect on a call-waiting interruption, even when error control is active. -- Toby Nixon, Principal Engineer | Voice +1-404-449-8791 Telex 151243420 Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net
ho@hoss.unl.edu (Tiny Bubbles...) (01/24/91)
In <3747.279dcc02@hayes.uucp> tnixon@hayes.uucp writes: >In article <1991Jan23.015246.3728@hoss.unl.edu>, ho@hoss.unl.edu >(Tiny Bubbles...) writes: >> Obviously, this is useless under V.32 (what, line noise? let's >> ignore it and ask for a retransmit). But if I have a "normal" line >Perhaps you're talking about V.42 (error control) rather than V.32 >(modulation). A V.32 modem may, in fact, disconnect on a call You're right, of course, now that I think about it. I had been reading a manual at work for a Microcom modem which said the S10 register was ignored on V.32 connections. Either they're actually disabling it on V.32 (when it may be unnecessary), or the manual meant to say V.42. As for trying it, it's not really an option, as nobody in town offers affordable 9600-baud modems. Thus I'd have to get one mail-order to try anything. Can you imagine the face of the customer-service representative when I tell her/him that my modem won't hang up on line noise?? :-) -- ... Michael Ho, University of Nebraska Internet: ho@hoss.unl.edu | "Mine... is the last voice that you will ever hear." Disclaimer: Peons don't speak for bigwigs.
root@zswamp.fidonet.org (Geoffrey Welsh) (01/27/91)
>From: tnixon@hayes.uucp >A V.32 modem may, in fact, disconnect on a call >waiting beep -- depends upon the implementation. The >process controlled by S9/S10 (detection of carrier loss) I cannot stress enough the trouble you'll save yourself by setting S9=12, S10=14. This gives your modem substantial immunity to both call waiting beeps and false carrier detect if a Trailblazer answers the line with two tone bursts before falling back to a single-carrier answer tone. -- UUCP: watmath!xenitec!zswamp!root | 602-66 Mooregate Crescent Internet: root@zswamp.fidonet.org | Kitchener, Ontario FidoNet: SYSOP, 1:221/171 | N2M 5E6 CANADA Data: (519) 742-8939 | (519) 741-9553 MC Hammer, n. Device used to ensure firm seating of MicroChannel boards Try our new Molson 'C' compiler... it specializes in 'case' statements!