Lexmark MX710 series User Manual page 124

Faxing
There may be an adapter plug installed in the telephone port of the printer. Do not remove the adapter plug
from the telephone port of the printer if you are connecting to a serial or cascaded telephone system.
Part name
Lexmark adapter plug
Connecting the printer to a non‑RJ11 wall jack
1
Connect one end of the telephone cable to the line port of the printer.
2
Connect the other end of the cable to the RJ11 adapter, and then connect the adapter to the wall jack.
Part number
40X8519
124