[wellylug] Sluggish Modem

Klenner, Colin colin.klenner at eds.com
Tue Jul 13 15:16:55 NZST 2004


-----Original Message-----
From: wellylug-admin at lists.naos.co.nz
[mailto:wellylug-admin at lists.naos.co.nz] On Behalf Of Jethro Carr
Sent: Tuesday, July 13, 2004 2:51 PM
To: WellyLUG Mailing
Subject: [wellylug] Sluggish Modem


hi all,

I've got a pcmcia dialup modem, 3COM 3CCM156B. This modem is supported, and
works under linux.

I can connect & surf the web, but it runs very slowly (1.5kbs).

Could it be an IRQ conflict that's doing it, or some setting that slows it?

thanks for any help,


-- 
-- Jethro

dodocaptain at paradise.net.nz
~~~~~~~~~~~~~~~~~~~~~~~~~~

Jethro
This can be caused by a number of things.
1. Is this a line you use regularly and get better performance from? If you
have not used this line then check by putting a different machine with a
standard modem on the line and see what you get.
2. The modem may have been detected correctly but the default rates for
packet size may be
	- Too big, if line quality is poor
	- Too small, if the modem negotiation is not correctly happening
3. The modem may have been correctly detected but the configuration
defaulted to a slower modem speed (some do as a precaution and expect you to
tweak it later)
4. The TTY rate may be set at 9600 which is the rate between your machine
and the modem itself. Check this is as fast as reasonable (115200) in the
TTY settings for the modem

After all that you may have to check that the driver for the modem is
correct and matches. If it is generic then it usually slows the transfer
rate down as a default. 

Colin




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