[3449] in RedHat Linux List
Re: which speed and where?
daemon@ATHENA.MIT.EDU (Robert Hart)
Fri Nov 8 16:15:42 1996
Date: Sat, 9 Nov 1996 08:06:57 +1100 (EST)
From: Robert Hart <hartr@interweft.com.au>
Reply-To: Robert Hart <iweft@ipax.com.au>
To: Debi Tackett <dtackett@MaximumAccess.com>
cc: RedHat <redhat-list@redhat.com>
In-Reply-To: <Pine.LNX.3.91.961107144316.1047A-100000@Baluga.MaximumAccess.com>
Resent-From: redhat-list@redhat.com
On Thu, 7 Nov 1996, Debi Tackett wrote:
> OK, group, someone please help me to sort this out. I have a RocketPort
> using mgetty 0.99.2 and pppd 2.2.0f. I can use setrocket to set my
> serial port speed to 230kb. I can set pppd to 38400 in my options file
> and I can also set mgetty to 38400 in my mgetty.config file. I am using
> 85% Courier 33.6 and the rest Boca 28.8 modems. My current settings are
> listed as above, except I have my RocketPort set to 115kb. What should I
> be using for optimal speed/throughput? This has always been a confusing
> issue to me, so if anyone can shed some light on this I would really
> appreciate it. Thanks.
To maximise your throughtput you should
1) Lock your Linux PC serial port to 115,200bps
2) Lock your modem serial port to 115,200bps
3) Allow the telephone interface to autobaud to the incoming modem speed.
This is known as 'split speed' as far as the modem is concerned - check
the modem manual to see how to do this. All 28.8 kbps modems that I have
seen have this capacity.
If you are using pppd-2.1.2 and Linux 1.2.13, you will probably need to
use 'setserial' to tell the PC serial port to actually choose 115,200 bps
when a speed of 38,400 bps is requested (for example by pppd ... /dev/cua1
38400).
This will give the maximum throughput on your modems/ PC port combination
(remember, the modems at high speed will be compressing data and you will
throttle the throughput if your serial ports are actually only capable of
38,400 throughput if that is the speed to which they have actually been
set.
Robert Hart iweft@ipax.com.au
Voice: +61 (0)3 9735 3586 http://203.29.72.65/
InterWeft, 35 Summit Road, Lilydale, Victoria 3140, Australia
IT, data and voice networking
Strategic IT business planning
Internet planning, implementation, security and configuration
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