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Article #1361

Re: Which ISDN protocol best for PPP ?

#1361
From: Marc Liyanage
Date: Sat, 22 Feb 1997 00:00
67 lines
2431 bytes


In article <5e4di6$uld$1@vulcan.alphanet.ch>,
schaefer@vulcan.alphanet.ch (Marc SCHAEFER) wrote:

>Hi,
>
>I am using UNIX/Linux 2.0.29 with a ZyXEL 2864I (ISDN version).
>Currently I dial my Internet service (!) provider with ISDN X.75 (one
>channel), and I run pppd version 2.2 patch level 0 (under diald
>control for automatic connection opening when one of the internal UNIX
>and non UNIX machines wants to connect to the Internet).
>
>What is the best (delay term and throughoutput) ISDN protocol for this ?
>Do you have some figures for me ?

I would recommend using synchronous PPP (PPP over HDLC) as it hast
the fewest percentage of protocol overhead... Possibly also lower latency
time, but I'm not sure about that one.


The string to use with a ZyXEL ISDN adapter is at&o2b40

The terminal server you are dialing into must support HDLC-PPP of course.


If it does further support Multilink PPP you could also combine two 
B-channels for more throughput and higher phone charges :-)


The string to use for that feature on a ZyXEL is

Macintosh:
at&f&o2b40&d0&j3ja59kam0kas30js59ksm0kss20

(I kid you not...)

Windows:
at&f&o2b40&d2&j3ja59kam0kas30js59ksm0kss20


It will open the second B-channel only after reaching continuous throughput
of 59 KBit/s on the first channel during 30 seconds. The second channel
will be dropped when the throughput drops again.


This will not work with firmware versions older than 2.03.

You can find instructions (in german) on how to update to the most recent
version at

http://www.access.ch/tips/zyxel/zyxel-update.html






--
_________________________________________________________________
Marc Liyanage                                  liyanage@access.ch 
                                        Bronschhofen, Switzerland 
                      http://www.access.ch/whoiswho/liyanage.html

         /* You are not expected to understand this */ 
_________________________________________________________________
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From: liyanage@access.ch (Marc Liyanage)
Subject: Re: Which ISDN protocol best for PPP ?
Date: 1997/02/22
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