Xref: utzoo comp.dcom.modems:2850 comp.sys.att:4678
Path: utzoo!attcan!uunet!husc6!bloom-beacon!mcgill-vision!iros1!vedge!onfcanim!dave
From: dave@onfcanim.UUCP (Dave Martindale)
Newsgroups: comp.dcom.modems,comp.sys.att
Subject: Re: Verbose modems (Re: MORE 6386 UUCP WOES)
Keywords: cu, Hayes Modem
Message-ID: <16652@onfcanim.UUCP>
Date: 3 Nov 88 16:44:33 GMT
References: <319@argon.UUCP> <2096@cuuxb.ATT.COM> <727@wsccs.UUCP> <889@vsi.COM> <758@wsccs.UUCP>
Reply-To: dave@onfcanim.UUCP (Dave Martindale)
Organization: National Film Board / Office national du film, Montreal
Lines: 27

In my humble opinion, a modem that is configured correctly for answer use
will obey the RS-232 specs:

1) if DTR is low, the modem will not answer

2) if DTR is dropped during a connection, the modem will hang up

3) the modem WILL NOT utter nonsense like "RING" or "CONNECT" on the
   Receive Data lines.  That's what the Ring and Carrier pins are for.

4) the modem will not, under any circumstances, treat incoming or outgoing
   characters as a "command mode escape".


If you are going to use the modem for dialout as well, you also need:

5) the modem should be able to return status information (RING, etc.)
   when in originate mode

6) If (5) is done by changing the internal modem state with commands,
   the modem must be reset to its "answer mode" state by the fall of DTR.


Now, a Telebit Trailblazer can simultaneously be configured to be quiet
during answer mode and verbose during originate mode.  With most others,
you make the modem default to quiet when reset, and tell it to be verbose
as part of the dial string.