HDB and \"e\" protocol

[Guy Harris]

> Actually, the higher speeds reported with the ethernet and direct
> X.25 connection protocols in X.25/ethernet environments 
> is not so much a result of the "error-free" end-to-end (computer-to-
> computer) connection but the result of the end-to-end hardware flow
> control that must be present on such circuits.

What hardware flow control?  An Ethernet interface doesn't know whether
anybody's picking up the packets you're sending; there's no end-to-end flow
control in Ethernet.  The "e" protocol runs over protocols like TCP that
*do* provide end-to-end flow control; that's usually not done in the
hardware, though.
-- 
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy at sun.com (or guy at sun.arpa)