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From: wrf@mab.ecse.rpi.edu (Wm Randolph Franklin)
Newsgroups: comp.dcom.telecom
Subject: Re: Phone Calls at the Speed of Light
Message-ID: <3517@accuvax.nwu.edu>
Date: 3 Feb 90 23:54:20 GMT
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X-Telecom-Digest: Volume 10, Issue 75, message 6 of 13


In article <3396@accuvax.nwu.edu> Don Alvarez <boomer@athena.princeton.edu> 
writes:

>		Telephone Transmission Line Data
>Characteristics of Standard Types of Aerial Wire Telephone Circuits

>			At 1000 Cycles Per Second

>Type of Circuit	Gauge	Spacing	Velocity
>			(mils)	(in.)	(miles/s)
>Non-Pole Pair Physical	165	8	179,000
>Non-Pole Pair Side	165	12	179,500
                                ==
 (etc)

However, 8" or 12" spacing in the air is somewhat different from 0.05"
spacing in a twisted pair.  I thought that those signals traveled at
about 2/3 c.  Actually what we really want is the speed in a coax.


Wm. Randolph Franklin
Internet: wrf@ecse.rpi.edu (or @cs.rpi.edu)    Bitnet: Wrfrankl@Rpitsmts
Telephone: (518) 276-6077;  Telex: 6716050 RPI TROU; Fax: (518) 276-6261
Paper: ECSE Dept., 6026 JEC, Rensselaer Polytechnic Inst, Troy NY, 12180