Re: ISDN question

[Jason Watson <flagg@xxxxxxxxxxx>]

One thing you may wish to check, is whether or not the modem responds to
AT commands at higher than 115.2 K speed.  Speaking from experience with
3com Impact IQ TAs, they won't respond to AT commands above 115.2K.
The documentation lends itself to this by stating you cannot change 
modem settings(like switch types, spids, etc..) while the modem is at its
highest rated speed.  

Literally you send it a AT command to switch speed to 230K, and that's it.
If you have a serial console to it, its like echoing to /dev/null.
(and its not easy getting it back)

Under Windows, I suspect there is a special handshake occuring
via some driver and the modem to handle the bare minimum to act as a
modem(like call management, call status, etc..)  I have seen several
standalone soultions like Ramp Networks Webramps, I forgot the model, but
it had a external serial port(s?), and the 3com Impact IQ was one of the
'supported' models at 230K.

Insofar, I haven't seen anything for Linux in regards to the Impact IQ, 
but I haven't been looking for a while.

Just a thought.

Jason

On Mon, 6 Nov 2000 Chad.Heidema@donnelly.com wrote:

> 
> 
> To make it convenient for after hours support, my employer installed an ISDN
> line recently and have a MultiTech terminal adapter on order. From what I've
> seen so far, it looks like TAs are just modems to linux so I should be set
> there. One thing I've read is that a standard serial port which connects the TA
> to my computer only supports 115K of bandwidth while the ISDN line should be
> faster so my serial port is a bottleneck. Has anybody installed a high speed
> serial port with linux and have any recommendations on brand/model I'd
> appreciate it. Thanks!
> 
> Chad Heidema
> Holland
> 
> 
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