Line Cord; Operation; Line Monitoring; Dialing - Fluke TS 120 User Manual

TS120 Test Telephone
Users Guide

Line Cord

See Figure 4.
The TS120 comes with a line cord for connecting the
test telephone to telephone lines. This line cord consists
of one red and one black insulated conductor, each
approximately 1.5 meters long. Each conductor is fitted
with an alligator clip. Each clip is covered with a
neoprene boot to prevent the clips from causing
electrical shorts.
Figure 4. Line Cord

Operation

WX
When connecting to metallic network wires,
handle alligator clips by insulated boots.

Line Monitoring

Move the TALK/MONITOR switch to MONITOR and
connect the red and black test leads to the telephone
line wire pair under test. If there is any audio on the
line under test, it can now be heard in the unit's
receiver. Because the TS120 presents a high impedance
to the line when in Monitor mode, it will not disturb
existing signals on the line under test. Monitor mode is
typically used by service personnel to verify that there is
no call in progress on the wire pair before going off-
hook.
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Warning

Dialing

If tone dialing is selected, the tones associated
with each digit will be generated as its
respective key is pressed. If pulse signaling has
been selected, the desired number may be
entered at any rate on the keypad. The digits
will automatically be pulsed out at the correct
rate.
Move the TALK/MONITOR switch to the MONITOR
position and connect the red and black test leads to the
wire pair under test. Move the TONE/PULSE switch to
select the desired dialing mode. Move the TALK/
MONITOR switch to TALK, and verify that dial tone is
received. Enter the number to be called on the keypad.
To end the call, either during or after dialing, move the
TALK/MONITOR switch to the MONITOR position.

Mixed Mode Dialing

On some telephone lines, calls can only be set up by
pulse dialing. Once the call is established in Pulse mode,
then the TONE/PULSE switch can be moved to the
TONE position. Tones can now be sent over the
telephone lines by pressing dialing keys. This is useful
when there is a need to send dialing tones as data to
activate some function in a device connected to the
other end of the telephone line. For example, dialing
tones can be used to command an answering machine
to play back recorded messages.

Last Number Redial

If a call is not successful and you wish to redial that
number, do the following: Put the TS120 Test
Telephone into Monitor mode, then put the unit back
into Talk mode, and press the REDIAL key. The last
number dialed will be automatically redialed. The
number in the redial memory is saved for about 8
minutes when the unit is in Monitor mode. The last
number redial function is available in either the Pulse
or Tone mode. The redial memory has a 23-digit
capacity.
Note