Function Switches, Buttons,
and LEDs
Talk-Bell-Monitor Switch
- This three-
position slide switch is located on the side of
the unit below the receiver. It is used to select
the mode of operation.
Talk
- This position creates an off-hook
condition. In this mode, the unit can be used
for signaling, conversation and testing, just
like an ordinary telephone.
Bell
- This position connects the internal
electronic ringer for receipt of incoming ring
signals. This on-hook mode also isolates both
the testing and speech circuits from the line.
Monitor
- The battery is off in this mode. This
position connects the test set through a high
impedance coupling. This on-hook connection
allows for telephone line monitoring without
disturbing conversations, network signaling,
or data transmissions. In this mode, the unit’s
speech, ring and test circuits are isolated from
the line.
Tone-Pulse Switch
- This two-position slide
switch is used to select the dialing mode. The
tone
position selects
dtmf
signaling. The
pulse
position selects rotary style pulse dialing.
