Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!ucdavis!iris!hildum
From: hildum@iris.ucdavis.edu (Eric Hildum)
Newsgroups: comp.os.vms
Subject: Re: phone and decservers
Message-ID: <1232@ucdavis.ucdavis.edu>
Date: 25 Feb 88 00:09:12 GMT
References: <8802210603.AA29392@ucbvax.Berkeley.EDU>
Sender: uucp@ucdavis.ucdavis.edu
Reply-To: hildum@iris.UUCP (Eric Hildum)
Organization: U.C. Davis - College of Engineering
Lines: 21

In article <8802210603.AA29392@ucbvax.Berkeley.EDU> AAD@GOLD.SCRIBE.COM writes:
>
>I was once told that the lat servers send an ethernet packet for every
>character, and that thus the overhead is ~256 to 1. (The same person
>said that the minimun size for an enet packet is something like 256 bytes)


There is a little more to the LAT server's algorithm than this.

The server will wait a set amount of time, hoping that others will
also type something in, before sending the packet.  This time is
picked so that the induced delay in response will not be noticeable to
the users.  The optimization is for a maximum delay, rather than a
shortest average delay. The article "Terminal Servers on Ethernet
Local Area Networks" in the Digital Technical Journal #3, September,
1986 goes into this in more detail.

					Eric

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