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Path: utzoo!utgpu!water!watmath!clyde!rutgers!seismo!munnari!kre
From: kre@munnari.UUCP
Newsgroups: comp.unix.wizards,comp.bugs.4bsd
Subject: Re: lack of modem control on MVAX-II with DHV running 4.3bsd
Message-ID: <1663@munnari.oz>
Date: Fri, 29-May-87 17:37:18 EDT
Article-I.D.: munnari.1663
Posted: Fri May 29 17:37:18 1987
Date-Received: Sat, 30-May-87 11:22:27 EDT
References: <312@asic001.UUCP> <1075@copper.TEK.COM>
Organization: Comp Sci, Melbourne Uni, Australia
Lines: 21
Xref: utgpu comp.unix.wizards:2288 comp.bugs.4bsd:354
Summary: Why bsd & ultrix (and probably uVMS) come configured for no modem control

In article <1075@copper.TEK.COM>, stevesu@copper.TEK.COM (Steve Summit) writes:
> Flame on:  Why do all of these systems have soft carrier as the
> default?

Its really quite simple .. if the lines come configured this way
ou can easily log onto some random terminal and change it.

If they come configured the other way, and your wires don't
implement the modem control signals, then when you attempt to log
in the system will just sit there.  Makes it a little hard
to change!  (yes, you can work on the console).

Many sites don't add the extra wire for economic reasons, if
you have hundreds of terminals, the extra wire (or 4 wires
if you really do it correctly, and have carrier in both directions,
and RTS/CTS as well) can make a big difference to the cost.
Not that I advocate the cost cutting, at least having carrier
from the terminal to the host is a very good idea, the other wires
are probably sufficient if implemented where the device needs them.

kre