> This confuses me greatly. I thought ISDN inherently provides a method of
> sending bits.
It does, and that would be fine if you were just sending bits
continuously. However, in the real world you need to send bytes, 32-bit
words, frames, packets, etc, and you need to be able to delimit them.
Another issue is that you probably won't be sending all the time, which
means that you need to have some way of signalling your intention to
start/stop sending to the other party.
> Why do you need start or stop bits, which are usually sent to
> synchronise clocks?
Nope, start and stop bits are usually just there to delimit the data that
you are sending down the pipe. The framing bits that James was talking
about are to keep the whole thing honest (i.e. you might be sending 256
bits, but equally you could only be sending 32 bits). Clock
synchronisation is done differently.
> Presumably PPP is the best protocol to tell our customers to use to connect
> to our PM3?
Yes.
> If their TA does not support PPP, what is the next best protocol to use?
V.120
-- Richard Morrell richard@ednet.co.uk System Administrator - edNET: Internet Access for Edinburgh - www.ednet.co.uk
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