Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!brutus.cs.uiuc.edu!ux1.cso.uiuc.edu!krol
From: krol@ux1.cso.uiuc.edu (Ed Krol)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: How is TCP/IP carried on T1's?
Message-ID: <1990Jan4.111635.12213@ux1.cso.uiuc.edu>
Date: 4 Jan 90 11:16:35 GMT
References: <2695@ucsfcca.ucsf.edu>
Organization: University of Illinois at Urbana
Lines: 11

jst@cca.ucsf.edu (Joe Stong) writes:

>Someone I know claims that most TCP/IP packets transmitted on T1 lines are
>imbedded in X.25 protocol packets.  Is this true, or what is actually
>used?   Or it TCP/IP alone with maybe an alternate checksum (CRC) sufficient?

>      Joe Stong     jst@cca.ucsf.edu

Not having counted packets much lately, but I would bet that most
IP packets on T1 lines are imbedded in HDLC packets.
Since that is what a lot of commercial routers use on their serial lines.