17.3.1.4. Displaying Link Status 
The link status of the LAN interface (link signal Ethernet, LAN speed,
and LAN interface) can be displayed at each level with the AMO SDSU using
the usual commands (PERI1, PERI2, and PERI3):
DISPLAY-SDSU:TYPE=PEN,LEVEL=PERI1,LTG=1,LTU=<ltu no>, SLOT=<slot no>;