Hi Bob.

13-Jun-04 13:19:08, Bob Lawrence wrote to Rod Gasson

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

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

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

 BL> We used to match TV tuners using standing waves on a long cable,
 BL> but to get decent amplitudes we used 100-metres of one-inch cable!

They used thick cable for long runs of 10Mbps ethernet too. they had a
different conection scheme though.  these days fibre-optic is used for
long runs,

 -=> Bye <=-

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