On Mar 24, 15:07, Dwight Elvey wrote: As Tony has already pointed out, that can't be completely true, because it would depend on the velocity factor of the cable, and the standard does indeed specify only a minimum of 0.77 for that. Typical values for thick ether are 0.78-0.8, which gives quite a variation. In addition, it would require that pulses from two stations be in sync, which is unlikely since there's no master clock. Actually, the minimum packet size is what determines the maximum total length *including* repeaters. The maximum length *without* a repeater is determined by the signal losses. That's my understanding, too. -- Pete Peter Turnbull Network Manager Dept. of Computer Science University of York