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From: guy@sun.uucp (Guy Harris)
Newsgroups: net.unix-wizards
Subject: Re: HDB and \"e\" protocol
Message-ID: <5761@sun.uucp>
Date: Sat, 2-Aug-86 19:11:49 EDT
Article-I.D.: sun.5761
Posted: Sat Aug  2 19:11:49 1986
Date-Received: Sun, 3-Aug-86 06:12:44 EDT
References: <2755@brl-smoke.ARPA>
Organization: Sun Microsystems, Inc.
Lines: 15

> 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@sun.com (or guy@sun.arpa)