They are all based on the original work done by IBM for SDLC. SDLC uses a
complicated master-slave scheme that is not used in the other protocols.
However, the fields in all of the frames of the protocols mentioned were
basically derived from a special case of the SDLC protocol.

Regards,
MLC

perez claude-vincent <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Dear all,
>
> I am a little bit confused about the difference of
> framing between hdlc, sdlc, lapb, lapd, llc2.
>
> Can someone help me?
>
> Thank you, cvp.
>
>
>
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