BL> That business of terminating the cable has always amused me.
BL> There is no reason to terminate a short cable, the reflections
BL> at 100MHz will be stuff-all under about 10-metres, and with
BL> that silly thin cable they use, the losses are so great that
BL> any reflection will be lost at anything *over* that!

JB> thin (co-ax) ethernet ran at 10Mbps, with NRZ coding (which
JB> means most of the energy in the signal is between 5 and 10Mhz)

 Ahem. That means reflection along 10-metres will be 10-times less
(which is why I used the larger number). I could look up the book and
give you the formaulas, but I can't be bothered. Trust me, I'm an
engineer.

JB> I'm told that if you pull the terminator off the cable it stops
JB> working. 

 ROFL!

 I don't doubt that you have been told that. Christopher Columbus was
told he'd sail off the edge of the world. It's always *nicer* to
correctrly terminate a coax, but with only two computers on a cable
less than 10 metres, it would make bugger-all difference, especially
when data slices the pulse with aSchmitt trigger, anyway.

Regards,
Bob

 



  

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