>Perhaps that's why Livingston only supports those protocols? What's the
>benefit of adding HDLC to a Livingston box if it can interoperate with
>other vendors?
Well, if it supported at least one of these implementations... It would
not only make the Livingston product much faster, but there would be a
secondary benefit to whoever the lucky compatible manufacturer was in
terms of sales. Or it would make Livingston's own router line more
saleable. I do know that, at least for Cisco, the difference between
running PPP and HDLC is significant.