gsm0710muxd(8) a GSM 07.10 muxer


gsm0710muxd [options]


A GSM muxer is needed to keep a PPP/GPRS up & running while sms and calls are still signaled on another channel. Some modems even support using GPRS while a call is active, others suspend GPRS during calls.

The muxer supports various options to change the behaviour for different modems. Use -h to see a brief help screen.

All logging is done through syslog, see the syslog for errors and warnings.


Fork, get a daemon (default: no)

Verboser logging (give twice for even more verbose)

-s <serial port name>
Serial port device to connect to (default: /dev/modem)

-t <timeout>
reset modem after this number of seconds of silence (default: 0)

-P <pin-code>
PIN code to unlock SIM (default: <not set>). This is normally not needed but some modems need the pin before enabling the muxer mode.

-p <number>
use ping and reset modem after this number of unanswered pings (default: 0)

-l <filename>
set logfile name (default: <not set>)

-x <dir>
power management base dir (default: <not set>)

-a <mode>
additional_functionality (default: 0). This is a bit-set enabling quirks for different modem. The quirks are: WAKEUP_WITH_SYSFS = 1, WAKEUP_WITH_SEQUENCE = 2, SIEMENS_C35 = 4, ENFORA = 8, SHORT_INIT = 16.

-b <baudrate>
muxer-mode baudrate (default: 115200)

-B <baudrate>
serial port baudrate (default: 115200)

-m <mode>
Mode (basic, advanced) (default: advanced)

-f <framsize>
Frame size (default: 64)

Show a help message and display current settings.


The name 'gsm0710muxd' was chosen because the GSM specs describe this method in document 7.10.


gsm0710muxd There may accure bufferoverruns and thus missing data between muxer and client under certain situations.

Some settings could be determined by a AT-command at startup. This wouldn't be much reliable because modems often lie so i did not invest to much work in this.


M. Dietrich <[email protected]>