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From: arnief@tekgvs.LABS.TEK.COM (Arnie Frisch)
Newsgroups: sci.electronics
Subject: Re: LAN speed?????
Keywords: Ethernet, cable, transmission line.
Message-ID: <7301@tekgvs.LABS.TEK.COM>
Date: 12 Apr 90 21:57:11 GMT
References: <19603@boulder.Colorado.EDU>
Reply-To: arnief@tekgvs.LABS.TEK.COM (Arnie Frisch)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 23

In article <19603@boulder.Colorado.EDU> wallwey@snoopy.Colorado.EDU (WALLWEY DEAN WILLIAM) writes:
>
>Does anybody know the realistic speed limit of data transfer that can
>reliably be sent over RG-58 (or even the 75-ohm RG-59).
>
>[Personally I think LANS should be able to go lot faster than then
>the 10 megabit/sec. standard Ethernet---Anybody actually know?  I'm
>basing this guess on the fact that I'm able to receive 40 channles of
>real time videa over RG-59(just like RG-58 only different impedence) via
>local cable.   If each station requires about 6MHz of bandwidth alone,
>than ethernet should be no where near the limits of the RG-58 cable.
>
RG-58 has 1.4 db of loss per 100 ft at 10 megaHertz.
The standard ethernet cable has less loss than this, but long runs
obviously degrade its signal quality.

The thru-put of ethernet is much lower than 10 megabits per second
because of protocol and SW overhead.  An excellent system can run at 1
megabit persecond.  Most workstations run at 100 to 300 kbits per
second.

Arnold Frisch
Tektronix Laboratories