[Guy Harris <gharris@xxxxxxxxx>]

Tomas Vilda wrote:

> what lowest protocol is on raw B channel traffic (2), and what are 
> protocols that are encapsulated in that protocol going to highest level 
> IRC?

I'll discuss basic-rate ISDN here.

Physical layer:

	a TDM bitstream, with 2 B channels and 1 D channel, each of which is a 
"logical" bitstream

Link layer:

	PPP, probably in "HDLC-like" encapsulation, running on a B channel 
(there's also a protocol to let you run a single PPP link over multiple 
bitstreams, which I suspect is used for running PPP over 2 B channels in 
parallel)

Network layer:

	IP over PPP

Transport layer:

	TCP over IP

Application layer (perhaps containing its own session and presentation 
layer stuff, if necessary):

	IRC over TCP
> Regards,
> Tomas Vilda
>
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