topic Re: modem in Operating System - HP-UX

modem

Pieter_5 — Tue, 23 Dec 2003 05:45:42 GMT

I have an old hp-box on which client log in by modem. I use a mux-card for the connection. When I look in sam I see the following
/dev/xxx Modem 8/20/5/1 a2 38400 as entrys for
the analog Modems. A client claims that he uses a 56K modem this seems strange to me because a see a speed of 38400 baud in SAM. With which kind of modems can they login?

Re: modem

Paula J Frazer-Campbell — Tue, 23 Dec 2003 06:00:34 GMT

Hi

The modem whilst with a rated vale of 56k (on a good day with a following wind) will connect at the speed defined by your system, you could set on your system a speed of 9600 bps and a 56k moden will still connect, but at the 9600bps.
Autonegotion is going on - basically the moden requests initially a 56k connection but the system says sorry only 9600bps is allowed.

HTH

Paula

Re: modem

John Carr_2 — Tue, 23 Dec 2003 06:42:27 GMT

Basicall the modem can work at 56K if the telephone companies ever gave you enough bandwidth and reliabilty but your system has been set to work at a mamimum speed of 38400 baud. You can increase the baud rate and see if you get a better response from the connection :-) John.

Re: modem

Timothy P. Jackson — Wed, 24 Dec 2003 06:35:25 GMT

Pieter,
I deal with a lot of modems and old HP boxes. I have found that the best baud rates on the old boxes is 9600. You can also run at 19200 but 9600 is by far the most reliable. As far as connecting at 38400, with a 56K modem, the modem should sync up at 38400 or 19200. Remember that the modem to modem speed is not the same as the modem to system speed. You can connect to a modem at 56k and still have the modem talking to the system at different baud rate.

Hope this helps!

Tim