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From: avg@hq.demos.su (Vadim Antonov)
Newsgroups: comp.dcom.modems
Subject: Re: PEP turnaround time (was Re: V.32 vs Telebit: Which should I buy?)
Message-ID: <1991May22.202226.17485@hq.demos.su>
Date: 22 May 91 20:22:26 GMT
References: <9105210700.AA14518@ucbvax.Berkeley.EDU> <1991May22.002144.2198@netcom.COM>
Organization: DEMOS, Moscow, USSR
Lines: 25


In article <9105210700.AA14518@ucbvax.Berkeley.EDU> petty@ralvm31.vnet.ibm.com ("Jack Petty") writes:
>Have I read that for the Telebit proprietary modulation scheme it takes
>about 1 second to turn the line around?

In <1991May22.002144.2198@netcom.COM> gandrews@netcom.COM (Greg Andrews) writes:
>Yes, somebody said that on the net.  Note that they are using the modems in
>the USSR, where phone lines aren't very good.  His observations, while
>probably accurate for his line conditions are FAR from typical.

"Somebody" here is me; still I mentioned turnaround time of IP packets
which does not fit into PEP micro-packets (10 bytes) and therefore
Telebit packs it into small (256 bytes) or long packets. Moreover,
using S120 to prohibit micro-packets actually increases the speed because
if you've tuned it this way your modem will not switch from micro-packets
to small packets at each IP packet! And the line we do use have a
reasonable quality, though not the ideal.  Thus I think both your
and mine estimations are close to truth - simply we have measured
different things! ("Steerman, figures!" "Six!" "Six of what?" "What
figures?!")

Still, I haven't heard any suggestions about leased line modems :-(

Vadim Antonov
DEMOS, Moscow, USSR