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).