Date: Mon, 4 May 1998 10:46:03 -0500 (CDT) From: Jim Bryant <jbryant@unix.tfs.net> To: thz@tuebingen.netsurf.de (Thomas Zenker) Cc: freebsd-current@FreeBSD.ORG Subject: Re: Infrared ? (a simple experiment for laptop owners...) Message-ID: <199805041546.KAA06041@unix.tfs.net> In-Reply-To: <19980503222301.49687@tuebingen.netsurf.de> from Thomas Zenker at "May 3, 98 10:23:01 pm"
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In reply: > On Sun, May 03, 1998 at 04:45:27AM +0200, Luigi Rizzo wrote: > > > >Example: one side (the 'client' ppp) acts as a master, the other one as > > > >a slave. The protocol is governed by the master, and the slave can only > > > >send a packet right after a pkt coming from the master. > > > > > > Stupid as it may sound, this kind of thing could help improve ethernet > > > response in certain client-server scenarioes. On the other hand, IP > > > isn't very well suited to half-duplex, and to get a decent performance > > > you probably need to flip though Tanenbaums book and see if you can > > > find some old stuff from Hawai to use... > > > > where do you think i got these ideas :) > > > > Some years ago I have implemented for a radio network a protocol > based on the ECMA HDLC/TWA protocol (Two Way Asynchronous). For > radio networks you have the same problem, you can't hear while > crying so loud. The HDLC/TWA regulates the link access by having > a primary and secondaries, only primary is allowed to initiate a > transmition. For running a whole network with store & forward > relays I implemented a token passing protocol on top of this. For > packet protocols like UDP/IP it should be no problem to pass it > thru, never tried really to make it tunnel TCP/IP. Did anyone see my last posting on this topic? These ports are ideal for AX.25! HDLC/LAPB type protocols are well documented. IP can be tunneled easily, as a matter of fact there are half-duplex TCP/IP networks all over the world using these protocols. If anyone is interested, if I remember correctly, I have a copy of the AX.25 protocol available at my web page [see .sig]... I can also supply the LAPB docs. I think it's about time I dusted off my code and picked it up again... /sys/netccitt is a good starting point. jim -- All opinions expressed are mine, if you | "I will not be pushed, stamped, think otherwise, then go jump into turbid | briefed, debriefed, indexed, or radioactive waters and yell WAHOO !!! | numbered!" - #1, "The Prisoner" ------------------------------------------------------------------------------ Inet: jbryant@tfs.net AX.25: kc5vdj@wv0t.#neks.ks.usa.noam grid: EM28pw voice: KC5VDJ - 6 & 2 Meters AM/FM/SSB, 70cm FM. http://www.tfs.net/~jbryant ------------------------------------------------------------------------------ HF/6M/2M: IC-706-MkII, 2M: HTX-212, 2M: HTX-202, 70cm: HTX-404, Packet: KPC-3+ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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