Path: utzoo!attcan!uunet!tank!uxc!uwmcsd1!mailrus!nrl-cmf!cmcl2!adm!smoke!w8sdz
From: w8sdz@smoke.ARPA (Keith B. Petersen )
Newsgroups: comp.sys.apple
Subject: Re: Ymodem-G (again?!)
Message-ID: <8497@smoke.ARPA>
Date: 14 Sep 88 19:22:12 GMT
References: <8663@drutx.ATT.COM> <27636@think.UUCP> <8489@smoke.ARPA>
Reply-To: w8sdz@brl.arpa (Keith Petersen)
Distribution: comp
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 15

In article <8489@smoke.ARPA> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes:
>At normal modem speeds such as 2400 bps, there is so little gain
>in switching to a streaming protocol as to make it a waste of time
>to implement.  Do the calculations..

This is true if you're not using MNP modems.  When you use MNP, the
packetizing causes delays in getting the ACK/NAK from the receiver back
to the sender, thus reducing the throughput.  Streaming protocols like
Ymodem-G and Zmodem do not require ACKs from the receiver, thus
eliminating these delays.
-- 
Keith Petersen
Arpa: W8SDZ@SIMTEL20.ARMY.MIL
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