🚀 go-pugleaf

In <Bz6MnK.G6s@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:
>In article <tommy.724218064@hilbert> tommy@hilbert.att.com (Tom Reingold) writes:
 The offices already have
>>some serial cables running into them so I thought I would save some
>>money and trouble and use them for ethernet.  Is this likely to work
>>well?  ...

>The first question to ask for 10BaseT (twisted-pair) Ethernet is "are the
>wires *twisted* in *pairs*?".  The rule for 10BaseT is "no untwisted wiring,
>however short".

>I doubt very much that your serial cables are twisted-pair, although they
>might be.

Most high-grade serial cabling is indeed twisted pair--at least in my experience.
If the wiring goes through No. 66 punchblocks and appears to be telephone
cabling, it is twisted as well--although it may not meet the specs.

My experience with high-grade serial cabling is that most is twisted rather tight.

>>... My preliminary test shows that it works...

>I'm surprised.  In fact, I'm amazed, if these cables are any significant
>length.

I'm not.  I'm an EE-turned-computer-freak person.  Thus, I am familiar with what
VSWR on improper-impedance wiring can do.  At the power levels and wide frequency
range employed in 10base-T, I would forsee very little problem with wiring that
is up to half of spec length, even if the wiring varies wildly from the spec.



-- 

Lamar Owen, Systems Consultant          | If there were a tax on syn,
GE Lighting Systems, Hendersonville, NC | we'd all be broke.
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My opinions are not those of GE and do not reflect GE policy in any way.