JDS Uniphase Testifier User Manual page 16

To Place Tone on a Cable
) Connect cable to be traced to a main
unit jack. For best signal, do not
connect a remote to the other end.
Due to the shielding effect of twisted
pairs, the strongest signal is obtained
by having one wire of a pair carry tone.
Selecting a single pin instead of a pair
will do this. For coax, the Tone is best
applied to the shield and the shield
cannot be grounded.
) Turn on Testifier™ by pressing the
button associated with the connector
to be used followed by pressing the
TONE button. Short presses of the
TONE button will select a different pin.
Holding down the TONE button for more
than  seconds will select a different
tone pattern.
) To turn Testifier™ off, press any button
except TONE. The tone will turn off
automatically after about . hours.