Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!olivea!apple!netcom!gandrews
From: gandrews@netcom.COM (Greg Andrews)
Newsgroups: comp.dcom.modems
Subject: Re: Slip over T1000's
Summary: PEP isn't very comfortable for interactive SLIP stuff.
Message-ID: <1991Apr7.091025.15876@netcom.COM>
Date: 7 Apr 91 09:10:25 GMT
References: <155@blekko.UUCP>
Organization: Netcom - Online Communication Services  UNIX System {408 241-9760 guest}
Lines: 31

In article <155@blekko.UUCP> skrenta@blekko.UUCP (Rich Skrenta) writes:
>We're experimenting with SLIP over Telebit T1000's and we're getting
>pretty choppy response.  An rlogin over a direct connect slip line
>seems faster than over the Telebit.  Are there any registers that
>can be tweaked to improve slip performance?
>

Only if you're getting pauses from the modems retraining.  PEP's half
duplex nature adds extra delays onto network protocols like SLIP,
and that is what causes a lot of the 'choppiness' you're seeing.

Compressed SLIP can help on things like character delays, but overall
PEP is less comfortable than a full duplex modulation like V.32.

>
>Does V.32 do a better job with slip?  How much does slip spoofing in
>the T2500 help?
>

Yes, V.32 is full duplex, so the protocol ACKs come back when the
protocol expects them to, and the data moves along without as many
pauses.

The T2500 doesn't have SLIP spoofing.  Just the V.32 modulation (and
MNP/V.42 error correction protocols).

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|  Greg Andrews   |       UUCP: {apple,amdahl,claris}!netcom!gandrews    |
|                 |   Internet: gandrews@netcom.COM                      |
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