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From: gandrews@netcom.COM (Greg Andrews)
Newsgroups: comp.dcom.modems
Subject: Re: PEP turnaround time
Summary: That's not what I said.
Message-ID: <1991May24.061249.7492@netcom.COM>
Date: 24 May 91 06:12:49 GMT
References: <9105230658.AA29951@ucbvax.Berkeley.EDU>
Organization: Netcom - Online Communication Services  UNIX System {408 241-9760 guest}
Lines: 28

In article <9105230658.AA29951@ucbvax.Berkeley.EDU> petty@ralvm31.vnet.ibm.com ("Jack Petty") writes:
>Greg Andrews writes:
>
>> Over clean lines the typical single-character turnaround time of PEP is
>> around 140-160 milliseconds.                  ^^^^^^^^^^^^^^^
>
>Many thanks Greg.  If I understand you correctly, the round trip time
>for interactive use would be about 300 milliseconds.  That would be
>quite consistent with what I have read here (some people complain and
>some do not).  I think I remember there were some IBM System
>Journal articles long ago that indicated that programmer productivity
>was impacted if system response time was greater than 200-250
>milliseconds.
>

Well, that's not what I said.  What you called "round trip time" I called
"turnaround time", and was referring to the same thing.  After you send
a single character, you will get it back in 140-160 milliseconds with PEP
over clean phone lines (modems are using micro packets).


>Jack Petty

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