On Tue, Aug 14, 2001 at 10:43:06AM -0500, Reagen B . Ward wrote: > > ISDN is a single copper pair, not fibre. In fact, you can easily get > ISDN in areas that don't have any glass at all. T1s are also usually > copper, unless you have a bunch of lines. T1s and ISDN can be run over either. -brian