https://manpages.ubuntu.com/manpages/focal/man4/mn.4freebsd.html
Ubuntu Manpage: mn - Siemens Easy321-R1 E1/T1 device driver
Siemens Easy321-R1 E1/T1 device driver
ubuntumanpagemnsiemensdevice
https://manpages.ubuntu.com/manpages/focal/man4/if_mn.4freebsd.html
Ubuntu Manpage: mn - Siemens Easy321-R1 E1/T1 device driver
Siemens Easy321-R1 E1/T1 device driver
ubuntumanpagemnsiemensdevice