GSM MUX line discipline support (EXPERIMENTAL)

modulename: n_gsm.ko

configname: CONFIG_N_GSM

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>GSM MUX line discipline support (EXPERIMENTAL)
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
This line discipline provides support for the GSM MUX protocol and
presents the mux as a set of 61 individual tty devices.

source code:
drivers/tty/n_gsm.c