baycom - amateur (AX.25) packet radio network driver for baycom modems
The driver currently supports three different modems: ser12, par96 and par97.
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).
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.
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
The ioctl calls follow the implementation in the hdlcdrv.
- returns the modem type (i.e. ser12 or par96) and the options
in effect (currently only the source of the DCD signal)
- sets the modem type and the options. Only superuser can do this.
- return some debugging values. Not always available.
baycom (9), soundmodem (9), linux/drivers/net/hdlcdrv.c,
baycom was written by Thomas Sailer, HB9JNX/AE4WA, (email@example.com).