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From: rb@ccivax.UUCP (rex ballard)
Newsgroups: net.dcom,net.mail
Subject: Re: Re: PC Pursuit (opinions)
Message-ID: <265@ccivax.UUCP>
Date: Wed, 18-Sep-85 12:26:54 EDT
Article-I.D.: ccivax.265
Posted: Wed Sep 18 12:26:54 1985
Date-Received: Fri, 20-Sep-85 06:36:04 EDT
References: <63@seismo.CSS.GOV> <761@vortex.UUCP> <251@ccivax.UUCP> <433@kitty.UUCP>
Organization: CCI Telephony Systems Group,  Rochester NY
Lines: 30
Xref: watmath net.dcom:1308 net.mail:1184

> > One of the major problems facing the telco's in general and the long distance
> > companies in particular is the problem of people using SPRINT to call a long
> > distance bulliten board.  The modems are converting 300 baud signals into
> > binary signals between the two computers.  The lines being used are analog
> > lines being digitized at the rate of about 50KB/sec.  In other words, a line
> 									^^^^^^
> > capable of handling over 100 calls is being tied up for up to an hour.
>   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> 	You must be joking!  No one on Usenet can possibly be that naive about
> data communication.  Or can they...
> 
> +++  Larry Lippman @ Recognition Research Corp., Clarence, New York        +++
> +++  UUCP    {decvax,dual,rocksanne,rocksvax,watmath}!sunybcs!kitty!larry  +++
> +++  VOICE   716/741-9185		 {rice,shell}!baylor!/	           +++
> +++  FAX     716/741-9635 {AT&T 3510D}	           syr!buf!/		   +++
> +++  TELEX   69-71461 ansbak: ELGECOMCLR {via WUI} ihnp4!/		   +++
> +++									   +++
> +++                   "Have you hugged your cat today?"		           +++

The line being referred to is the typical PCM LEASED LINE used by long distance
carriers.  The actual rate is between 50KB and 56KB.

I used expr 50000 / 300 and came up with 166 300 baud lines into the system,
assuming that ECC and TDM are used 100 is a conservative estamate.  For 1200
baud lines, the number would be expr 50000 / 1200 or about 40 lines, for
more info find a copy of the CCITT YELLOW BOOK.  For statistical multiplexing,
each number would be about half.

I hope this clears up any confusion.