Path: utzoo!attcan!uunet!wuarchive!decwrl!sgi!vjs@rhyolite.wpd.sgi.com
From: vjs@rhyolite.wpd.sgi.com (Vernon Schryver)
Newsgroups: comp.protocols.misc
Subject: Re: SLIP: Why are people so reluctant to use it?
Message-ID: <72778@sgi.sgi.com>
Date: 20 Oct 90 19:02:22 GMT
References: <1990Oct16.225610.3505@oracle.com> <966@lafayet.UUCP>
Sender: guest@sgi.sgi.com
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 27

In article <966@lafayet.UUCP>, rob@lafayet.UUCP (Rob Freyder) writes:
> What if you want to connect two remote systems via Telebit T2500 in PEP
> mode ?  Is this reasonable ?


SLIP/PEP works fine for FTP, giving ~1000 Bytes/second transfer rates, but
less than the 1400 Bytes/sec. you can get with a pair of PEP modems doing
UUCP.

Vanillia SLIP/PEP is almost useless for interactive TCP work, because the
line turn around time caused by 41 byte headers (1 for SLIP, 40 for TCP/IP)
in front of every data packet makes response far from crisp.

Compressed-SLIP/PEP, is almost indistinquishable from dumb terminal use
over PEP.  I find it usable.

Many people find the 0.02 to 0.14 second delays from the PEP line
turn-arounds objectionable, with compressed-SLIP or remote terminals.


For interactive use, SLIP or not, the v.32 mode of T2500's (and others) is
probably better, even if the file transfer rate for FTP/SLIP/v.32 is <960
Bytes/sec.



Vernon Schryver,   vjs@sgi.com