Russell Nelson writes:
> bcorwin writes:
> > But, the T1 is located about 100 ft. away from the roof peak. Is there a
> > distance limit to the ethernet cable?
>
> Yes, three times that distance, for cat-5. You're fine.
And even this is more about timing through the maximum number of
repeaters (3) than any electrical properties of the wire, or signal
that runs on it.
10Mbps 100Mbps
Collision diameter (bit-times) 512 bit-times 512 bit-times
Bit-times(�s) 0.1�s 0.01�s Max.
round-trip delay 51.2�s 5.12�s
Network diameter 2500m 250m
A CAT5 cable segment has about 1.112 bit times of RTT per meter, so
100 meters of CAT5 has 111.2 bit times of propigation delay.
Two TX/FX copper DTEs will probably also absorb another 100 bit times
of RTT, so you've got a bit of budget there, and, of course, if you
run TX/FX on wire between two DTEs (or two switches) on the 'segment'
there isn't really any such thing as a 'collision'. :-)
When I was at Wayport, we put an "extended distance" PHY on the
switches we built, which were rated at around 130 meters of CAT5.
So, buy the "right stuff", and you can run Ethernet a bit farther than
the EIA-568 'spec'. The "right stuff" probably doesn't include $5
Ethernet cards that you purchased at Frys though.
In addition, Mr. Corwin (?) may wish to consider how s/he is going to
run the power to the COR(s).
--
"Perl is basically TECO-99." ---Barry Shein
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