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NOTE: The DATA PORT jack should NOT be used to connect the second line
if you have two lines coming from separate wall jacks. See "Installation
Options" on page 4 for details on hooking up this type of system.
TIP: The display shows you which line the DATA PORT is currently using. If
the DATA PORT switch is set to off, it doesn't appear in the display.
IMPORTANT: Be sure to switch the fax machine back to the normal line when
you are done because outside callers who do not know that you have switched
lines will not be able to reach your fax machine if they dial the Line 1 number.