How do I cable an Ethernet?

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2 total messages Started by Robert Perlberg Sun, 04 May 1986 16:36

#1079

Author: Robert Perlberg
Date: Sun, 04 May 1986 16:36

7 lines
614 bytes

Is there any truth to the rumor I heard that plain RS-232 type cable
can be used to connect Ethernet transceivers?

Robert Perlberg
Resource Dynamics Inc.
New York
{philabs|delftcc}!rdin!perl

Re: How do I cable an Ethernet?

#1081

Author: Phil Ngai
Date: Wed, 07 May 1986 19:59

28 lines
1860 bytes

In article <546@rdin.UUCP> perl@rdin.UUCP (Robert Perlberg) writes:
>Is there any truth to the rumor I heard that plain RS-232 type cable
>can be used to connect Ethernet transceivers?

You could probably use telephone cable if it was short enough.  (six
inches?) "plain RS-232 type cable" is pretty ambigious.  I have been
tempted to use Belden 9891 Ethernet transceiver cable for RS-232.
Clearly I could convert that "RS-232" cable for transceiver cable use.
I have seen people use short lengths of flat ribbon cable for
transceiver cables (Interlan).

If you are going 50 meters then things get a little tougher.

The main considerations are that you need to supply 500 mA over 50
meters with only 2 volts of loss for the power and that the signals
are differential so you ought to use twisted pair for the
transmit/receive/collision signals. There are also crosstalk
requirements which are usually met by shielding each pair and then
shielding the entire cable as well.

IEEE 802.3 adds a fifth pair but I don't know if anyone uses it yet.
Anyone seen it?
-- 
 If a reactor melts down in Russia will they call it the America syndrome?

 Phil Ngai +1 408 749 5720
 UUCP: {ucbvax,decwrl,ihnp4,allegra}!amdcad!phil
 ARPA: amdcad!phil@decwrl.dec.com

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