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From: ralphs%halcyon.uucp@seattleu.edu
Newsgroups: comp.dcom.modems
Subject: Re: Inexpensive 9600 baud modems
Keywords: 9600, V.32, V.42, bis
Message-ID: <0k4qs3w163w@halcyon.uucp>
Date: 16 Nov 90 22:42:20 GMT
References: <29872@boulder.Colorado.EDU>
Organization: The 23:00 News
Lines: 29

stasica@boulder.Colorado.EDU (Creeping Death) writes:

> What's wrong with 9600 on a standard phone line?  I run an HST Dual Standard
> at 14.4k and have never had problems with phone lines.  In fact, I have heard
> that a couple companies have got 57.4k modems to work on a phone line (well,
> maybe a fiber optic line...but many phone lines are nowdays).

Many years ago, I commented to a Pacific NorthWest Bell tech that we were
using 19.2Kbaud modems over dialup phone lines locally, nationally, and
internationally (this was when AT&T and PNB were 'one and the same').  The
conversation moved to what was the maximum *supported* baudrate on AT&T's
longlines, and he stated they were tested to 4800 baud.  At that time we
were getting 1360cps Telebit-to-Telebit inter and intra-state and about
900cps internationally (Germany and Australia) with >300K binary files,
using streaming protocols.  The modems were Telebit RA-12's.  The local
telco was using S6A (?) hot-carrier lines and newly installed SLCC 96's
over 20-year old 24-26ga copper (the hot-carrier stuff appeared to put
modulate analog voice data over a ~100-volt DC carrier, while the 96's
were digital).  The telco Central Office used something that had been
around for a while before ESS was installed (mechanical, but not a #6
crossbar).

Note, since then throughput using the same configuration dropped, with the
advent of newer, more sophisticated satellite services.  Fortunately, the
modem manufacturers have released newer equipment that overcomes (to varying
degrees) the communications services' 'enhancements' (kinda like reversing
the air cleaner cover on your car to compensate for the loss of performance
due to smog controls).  The old hot-carrier lines gave way to the 96's and
new 22ga copper, now buried, and a brand-new ESS CO.