I quote Robert Klarmann:
 > higher. approx 6k/sec for a single B channel and bundled, it will be
 > double. (e.g. approx 64000 bps/128000 bps)
RK> with X75 (HDLC transparent) around 7800cps with one B
RK> channel - max. 8000cps cause there are no start/stop/parity
RK> bits
I don't know about the ZyXEL, but there is a difference between plain HDLC 
and X.75 layer 2. X.75 layer 2 is based on HDLC. In other words: X.75 layer 2 
is a superset of HDLC.
Jan
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