how internal modem on pc

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LEARN ABOUT DEBIAN

baycom

BAYCOM(9)						      Kernel Reference Guide							 BAYCOM(9)

NAME

       baycom - amateur (AX.25) packet radio network driver for baycom modems

SYNOPSIS

       #include <linux/baycom.h>
       #include <linux/hdlcdrv.h>

DESCRIPTION

       The driver currently supports three different modems: ser12, par96 and par97.

   ser12
       This  is a very simple 1200 baud AFSK modem. The modem consists only of a modulator/demodulator chip, usually a TI TCM3105. The computer is
       responsible for regenerating the receiver bit clock. The modem connects to a serial port, hence the name. Since the serial port is not used
       as  an  async serial port, the kernel driver for serial ports cannot be used, and this driver only supports standard serial hardware (8250,
       16450, 16550).

   par96
       This is a modem for 9600 baud FSK compatible to the G3RUH standard.  The modem does all the filtering and regenerates the  receiver  clock.
       Data  is transferred from and to the PC via a shift register.  The shift register is filled with 16 bits and an interrupt is signalled. The
       PC then empties the shift register in a burst. This modem connects to the parallel port, hence the name.

   par97
       This is a redesign of the par96 modem by Henning Rech, DF9IC. The modem is protocol compatible to par96, but uses only three low power  ICs
       and can therefore be fed from the parallel port and does not require an additional power supply.

IOCTL CALLS

       The ioctl calls follow the implementation in the hdlcdrv.

       BAYCOMCTL_GETMODEMTYPE
	      returns the modem type (i.e. ser12 or par96) and the options in effect (currently only the source of the DCD signal)

       BAYCOMCTL_SETMODEMTYPE
	      sets the modem type and the options. Only superuser can do this.

       BAYCOMCTL_GETDEBUG
	      return some debugging values. Not always available.

SEE ALSO

       baycom (9), soundmodem (9), linux/drivers/net/hdlcdrv.c,

AUTHOR

       baycom was written by Thomas Sailer, HB9JNX/AE4WA, (t.sailer@alumni.ethz.ch).

Linux 2.1.x							  2 October 1996							 BAYCOM(9)

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