Modem rpm

[ramadashsuresh]

Hai

where i can find the rpm for us robotics external modem on Redhat EL4 and need the installation procedure for that above

[Matti_Kurkela]

If the modem uses a standard interface (either serial or USB), there is no need for a custom RPMs.

The COM1 port is known as /dev/ttyS0 and COM2 is /dev/ttyS1 in Linux. The first USB modem device should be either /dev/ttyACM0 or /dev/ttyUSB0, depending on how the modem's USB interface circuit is designed.

The RedHat EL4 distribution contains everything that is needed to use normal external modems from all manufacturers.

Many internal and some USB modems (also known as "winmodems") might use a non-standard protocol: if your modem is one of these, it's impossible to answer without knowing the *exact* model of your modem.

For an Internet connection, you would generally use pppd (or maybe some GUI tools to configure it).

For an old-style terminal connection, there is "minicom". You can also use it to manually type AT commands to the modem: this may be necessary for special configuration or for in-depth modem diagnostics.

MK

[ramadashsuresh]

i have been using the 3com u.s. Robotics 56k external fax/voice modem connected via serail port
now that modem has been inistalled and when i try to connect the net 'NO CARRIER' error displayed i coul'd rectify that what's a exact problem.

it's difficult to configure the dial-up connection in linux?

[Matti_Kurkela]

NO CARRIER message comes from the modem. It means one of the following:

- your modem dialed a number, something answered but your modem could not connect to it (for example, there is a confused person at the other end, saying something like "Hello? Hello??? What's this awful noise?").
The modem tries to connect for a while, then gives up.

- you're dialing a wrong number, so the call ends up at the telephone company's recorded message. The modem tries to connect for a while, then gives up.

- a connection was successful, but was then lost. If this is the case, there should be a "CONNECT" message before "NO CARRIER".

If your modem has a speaker for connection troubleshooting and it's disabled, switch it on. (The AT command to switch the speaker on is "ATM1L2". You can use "L1" instead of "L2" to make it quieter, or "L3" to make it louder.)

When you try to connect using a modem, you should normally hear several things:
1.) normal telephone dial tone
2.) your modem dialing the number (usually a rapid-fire sequence of tones)
3.) a sound that indicates that the telephone company is making the other phone ring
4.) the whistle of the other modem
5.) various strange sounds (I can't describe it any other way!) when the two modems try to find out the highest speed they can use on this line
6.) silence after the speed negotiation is complete.

MK

[ramadashsuresh]

i am using the same modem to windows it's working fine whereas in linux same error has been replied

[Ralph Grothe]

You may well try to use one of those dumb devices called Winmodems
(http://en.wikipedia.org/wiki/Winmodem).
Typically laptops are often furnished with these.
Sometimes, the vendor supplies a BLOB driver for it (http://www.overridersworld.com/english/?p=61)
but you should better get rid of it and replace it with a decent modem.
Reclaim your money from the vendor, and tell them that you cannot use it.
If however, you cannot stifle the urge to use it, go here
http://www.linmodems.org/
and read this
http://tldp.org/HOWTO/Linmodem-HOWTO.html