soundmodem(9) [debian man page]

SOUNDMODEM(9)						      Kernel Reference Guide						     SOUNDMODEM(9)

NAME

       soundmodem - amateur (AX.25) packet radio network driver for soundcards

SYNOPSIS

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

DESCRIPTION

       The driver currently supports both 1200 baud AFSK and 9600 baud FSK (G3RUH compatible) using a standard SoundBlaster compatible or Windows-
       SoundSystem compatible soundcard. The whole decoding is done in software, so you definitely do not want to use it on a 386SX class machine.

KEYING THE TRANSMITTER

       Soundcards do not have a DC coupled output that could serve as a PTT signal. So there are basically for possibilities for obtaining  a  PTT
       signal. Sample schematic diagrams can be found on http://www.ife.ee.ethz.ch/~sailer/pcf/ptt_circ/ptt.html.

   VOX circuitry
       A  simple VOX circuitry that detects output signals at the output of the soundcard can be used, especially as it can be built with a single
       transistor plus a few passive components and typical soundcards have strong output signals.

   Parallel Port
       A parallel port line can also be used to signal PTT. If selected, the PTT signal is output on the DATA0 line and DCD is output on the DATA1
       line.

   Serial Port
       A standard serial port (8250, 16450, 16550) can also be used to output PTT. PTT is output on RTS and TxD, while DCD is output on DTR.

   MPU401 MIDI Port
       The MIDI port is basically an asynchronous serial interface and thus cannot output a straight DC level, however it may be used if connected
       through a retriggerable monoflop with about 15ms pulse duration. Note that only newer SoundBlaster models have a genuine MPU401 MIDI  port.
       The older SB MIDI port cannot be used.

IOCTL CALLS

       The ioctl calls follow the implementation in the hdlcdrv.

       SMCTL_GETMODEMTYPE
	      returns the modem type (i.e. SBC1200, SBC9600, WSS1200 or WSS9600)

       SMCTL_SETMODEMTYPE
	      sets the modem type. Only superuser can do this.

       SMCTL_GETMIXER
	      returns the mixer type and the contents of the specified mixer register.

       SMCTL_SETMIXER
	      sets the specified mixer register, if the specified mixer type matches the mixer type of the soundcard. Only superuser can do this.

       SMCTL_DIAGNOSE
	      returns the contents of the diagnose buffer, which is used by smdiag to display the eye and oscilloscope diagrams.

       SMCTL_GETDEBUG
	      return some debugging values. Not always available.

SEE ALSO

       baycom (9), soundmodem (9),smdiag (8),smmixer (9), linux/drivers/net/hdlcdrv.c,

AUTHOR

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

Linux 2.1.x							  2 October 1996						     SOUNDMODEM(9)

Check Out this Related Man Page

oss_usb(7)							    OSS Devices 							oss_usb(7)

NAME

       oss_usb - USB Audio/MIDI/Mixer driver

DESCRIPTION

       The Open Sound System driver for USB Audio and MIDI devices.

   AUDIO
       The Audio driver supports:

       o  8-96Khz Playback/Recording

       o  8 or 16 or 32 bits

       o  2, 4, 6 or 8 channel audio.

       o  SPDIF digital output and Input

       o  AC3 passthrough

       o  Volume control and device input mixer

   MIDI
       The  oss_usb driver supports all MIDI devices that are compatible with the official USB MIDI specification. In addition the driver supports
       few devices that use their own private protocol (including some Yamaha and Midiman models).

   USB MIXER
       The USB Audio mixer is a new type of mixer that doesn't have the normal volume controls found on AC97 or Legacy SB devices.  The USB  audio
       mixer provides control for selecting the Alternate device setting - this usually allows the device to be switched into a Professional audio
       mode (eg 24bit or 96Khz mode)

   ALTERNATIVE SETTINGS
       Some USB audio devices use a feature called as alternative settings for bandwidth management. Typically such  devices  have  multiple  high
       speed  inputs  and outputs that may require more bandwidth than provided by the USB bus. The alternative settings feature is used to select
       between multiple low speed devices or just few high speed devices.

       When the device has multiple alternative settings an "altsetting" selector will be visible in the control panel for the	device	(use  oss-
       mix(1) or ossxmix(1) to change it). Alternative setting OFF means that all audio devices are disabled. The other settings provide different
       combinations of high/medium speed devices. You can use the ossinfo(1) command (ossinfo -a -v3) to find out the  devices	supported  by  the
       currently selected alternative settings and the capabilities of them.

KNOWN BUGS

       Under  Linux  it  is necessary to run the ossdetect -d and ossdevlinks commands after an USB device has been hot-plugged. Alternatively you
       can execute soundoff and soundon to reload OSS.

OPTIONS

       None

FILES

       /etc/oss4/conf/oss_usb.conf Device configuration file

AUTHOR

       4Front Technologies

								 16 December 2012							oss_usb(7)

Linux and UNIX Man Pages

soundmodem(9) [debian man page]

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