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From: ben@catnip.UUCP
Newsgroups: comp.dcom.modems
Subject: Re: An interesting modem problem
Message-ID: <423@catnip.UUCP>
Date: Thu, 27-Nov-86 00:21:33 EST
Article-I.D.: catnip.423
Posted: Thu Nov 27 00:21:33 1986
Date-Received: Fri, 28-Nov-86 01:43:51 EST
References: <128@gaia.UUCP> <4070001@hpscda.HP.COM> <18@ucdavis.UUCP> <418@catnip.UUCP> <117@devon.UUCP>
Reply-To: ben@catnip.UUCP (Bennett Broder)
Organization: The Broder Residence, Holmdel, N.J.  07733
Lines: 27

In article <117@devon.UUCP> paul@devon.UUCP (Paul Sutcliffe Jr.) writes:
>In article <418@catnip.UUCP>, ben@catnip.UUCP (Bennett Broder) writes:
>[ refering to the CTS 2424 modem ]
>> It does have PW (power) and MR (modem ready) which are redundant.
>
>Not necessarily.  MR might indicate the presence (on) or absence (off)
>of DTR.  Most modems won't dial, answer, or do much of anything for 
>that matter, without DTR being high.

No, it has a TR light for that.

>It could also indicate that the modems power-up self-test (if it has
>one) has passed.

Ok, you've got my curiousity aroused.  I'll pull out the manual and
check...

No, actually, the MR light shows the status of the DSR line.  The only way
to get this light off (without turning off the power) is to put the modem
into digital loopback mode.  I'll concede that PW and MR are not entirely
redundant, but I maintain that this light is not nearly as important as
RD, SD, and AA, which I sorely miss.
-- 

Ben Broder
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