5
Physical Characteristics
Figure 3. Voice Controls
TS22A Speakerphone and Speaker Monitor
Modes
The TS22A speakerphone feature lets you carry on a
conversation hands-free. This increases safety when
working on ladders or in congested areas where the
restriction of line cords may cause a hazard.
The SPEAKER button controls the volume in
speakerphone and speaker modes. Speakerphone and
speaker modes have three volume levels (low, medium,
and high).
The speaker may be turned on in MONITOR mode.
Speakerphone mode may be used only in TALK mode.
With the speakerphone on, pressing the MUTE button
turns off the speakerphone microphone for privacy.
A call may be initiated with the speakerphone on or off
by moving the TALK/ MONITOR switch to the TALK
(off-hook) position.
When making a call in speakerphone mode, the
number keys being dialed can be heard from the
speaker. This feature gives an audible feedback to the
user and assures that each number is being dialed out.
In speakerphone and speaker modes, the TS22A Test
Set mutes the regular transmitter and receiver to
prevent acoustic feedback from the speaker. The
polarity LEDs turn off when the TS22A unit is switched
from Talk mode to either the speakerphone mode or
the speaker mode.
To prolong battery life, the TS22A Test Set will
automatically shut off the speakerphone or speaker
after approximately five minutes when there has been
no signal greater than -30 dBm. Because of the
automatic shut off feature, this function will have to be
reactivated every 5 minutes if no signal greater than
-30 dBm is detected.
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Talk/
Monitor
Switch
The T (TALK), position establishes an off-hook condition for dialing and talking as a common battery
telephone. The M (MONITOR) position removes the transmitter from the circuit, and provides a high
impedance coupling. On the TS22A, the M position provides a high impedance coupling, which
allows line monitoring without disrupting conversations or signaling.
MUTE
button
On the TS22A, pressing the MUTE button turns off the speakerphone microphone for privacy. On
the TS22, it disables the amplified speaker.
SPEAKER
Button
This button controls the speakerphone (TS22A only) and Monitor speaker sound levels. See “TS22
Amplified Speaker” and “TS22A Speakerphone and Speaker Monitor Modes”.
