Changing from Internal Modem to External Modem

Changing from Internal Modem to External Modem

Post by Ed » Fri, 03 Mar 2000 04:00:00

Hi folks.  I've just found out the internal modem in my newly-created
Linux box is a WinModem, and won't work with Linux.  Fine, cool, it's a
14.4 K and I wanted to get a faster one anyways.  So, I'm about to buy
an External Modem (as from my reading, just about any External modem is
supported by Linux) and use it.

As I am extremely new to Linux, I have a question for which an answer
would be greatly appreciated.

Do I need to rebuild my kernel to remove support for the old, internal
modem before I pull it out of the PC?  I looked at the options in my
menuconfig settings, and I didn't see anything for Modems.  So, I'm
guessing no.  But I'm sure a linux guru out there could confirm or deny
this for me...

Currently, my plan of attack is:

1) Login as root, and remove my /dev/modem symbolic link (the external
modem will not use the same port as the internal modem).
2) Shutdown and halt my system.
3) Pull out the old, unusable modem.
4) Connect the new, shining, linux-happy external modem to the Serial
port, and plugging it in.
5) Start up my box, logging in as root and creating /dev/modem as a
symbolic link to the correct /dev/ttySn device.
6) Wave to the cheering crowd, smell one of the roses thrown to my feet
and bow gracefully.

So, except for #6, is this all I need to do?  If I'm seriously missing
something, I'd appreciate a forewarning. :)

Other details: it's a 486 box (revived from the dead) and I'm running
Red Hat 6.0 on it.


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Changing from Internal Modem to External Modem

Post by Rob Cla » Fri, 03 Mar 2000 04:00:00

[..sensible steps..]

Quote:>So, except for #6, is this all I need to do?  If I'm seriously missing
>something, I'd appreciate a forewarning. :)

>Other details: it's a 486 box (revived from the dead) and I'm running
>Red Hat 6.0 on it.

Two possible hitches:
1) Some Packard Bell machines behave strangely when the modem is
   removed.  OTOH, I don't think they used winmodems the those machines.

B) If you have on-board COM ports, be sure to reenable the corresponding
   port in your BIOS so that you can use COM2 or whatever the 14.4K modem
   was claiming.  Ditto for a multi-I/O card-- jumper-enabled COM2.

Have fun!


1. Can an External modem and Internal modem coexist on Linux ?

    I have an internal modem (Rockwell HCF chipset) which normally
occupies COM3 in a Win95 environment, and I have recently installed an
external 'hardware' modem that is occupying /dev/ttyS1 in my SuSE 6.2
set up (same box, different parition !).

    I have used wvdialconf to try and detect the external modem (wasn't
expecting it to detect the winmodem !) and it failed saying that the
modem could not be detected but advising that LEDs, connections etc.
shgould be checked and wvdialconf attempted again.

    I did all this but no luck.

    Could the internal modem's presence be interfering with the
wvdialconf's ability to detect the external device ? My next test is to
borrow another external and try that on the same port as it could be
just that the current external is faulty. In the mean time, if anyone
knows what may be going on here I'd be obliged !!

      MINICOM  and kppp both reckon there's external no modem as well.
And, as a matter of interest, :-), under Win95, I can't dial out via
the external modem either !
Settings/Modem/Test Modem returns lots of valid looking stuff, but I
can dial out using a very old TELIX DOS program ! Just a bit of context
!!! I'm sure I'll be an expert by the end of it all !

Thanks in advance...

Kev Grindley.

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