default or selected kernelversion does not have config value CONFIG_LANMEDIA.
Result is shown for kernelversion 6.9.5

LanMedia Corp. SSI/V.35, T1/E1, HSSI, T3 boards

modulename: lmc.ko

configname: CONFIG_LANMEDIA

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wan interfaces support
└─>LanMedia Corp. SSI/V.35, T1/E1, HSSI, T3 boards
In linux kernel since version 2.6.12  
Driver for the following Lan Media family of serial boards:

- LMC 1000 board allows you to connect synchronous serial devices
(for example base-band modems, or any other device with the X.21,
V.24, V.35 or V.36 interface) to your Linux box.

- LMC 1200 with on board DSU board allows you to connect your Linux
box directly to a T1 or E1 circuit.

- LMC 5200 board provides a HSSI interface capable of running up to
52 Mbits per second.

- LMC 5245 board connects directly to a T3 circuit saving the
additional external hardware.

To change setting such as clock source you will need lmcctl.
It is available at <ftp://ftp.lanmedia.com/> (broken link).

To compile this driver as a module, choose M here: the
module will be called lmc.

source code: