T
E L E P H O N I C S
C
O R P O R A T I O N
TM115007 REV A (04/07)
2-16
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RESTRICTION ON THE TITLE PAGE OF THIS DOCUMENT
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C
O M M U N I C A T I O N
S
Y S T E M S
D
I V I S I O N
2.8.2
Talking on the Network
The user is offered three methods of speaking on the network.
With the first mode, the user breaks VOX by talking. The user knows VOX has been broken
when his sidetone is heard. Note that the TPT’s VOX setting must be in VOX ON for this
method to work.
With the second method, the user presses the PTT button. This method is useful if the VOX is
not enabled and in noisy environment when it may be hard to break VOX.
To make an emergency announcement on the net, the operator can press the PTT twice within
0.5 seconds. This will grant immediate access to a voice channel on the net.
It should be noted that the destination of the transmission is not dependent of the access method in
this configuration. However, the priority differs in between these access methods with VOX as the
lowest priority and emergency as the highest priority.
2.8.2.1 Transmission
Rejection
When the operator wants to transmit and the network is full, a “NEG RESPONSE” sound is heard in
the operator headset. The operator can then try to use an access method with higher priority.
2.8.2.2 Transmission
Indication
When the operator transmits successfully, a side tone is generated to the operator’s headset.
2.8.3 Volume
Adjustment
The up and down arrow keys (
i
and
j
are used to adjust the volume. A “KEY CLICK” sound
indicates a change of volume level. The volume is never completely shut off. If the user tries to
decrease the volume lower then the minimum level, the “KEY CLICK LOW” sound is heard instead
of the normal key click.
If the user tries to increase the volume higher than the maximum level, the “KEY CLICK HIGH”
sound is heard instead of the normal key click. To increase the volume one more step higher, press
and hold the up arrow key (
i
) for three seconds. This will override the normal high setting to a
maximum level. At the same time a repeating warning signal is started to alert the user of the
overridden volume limit. If the down arrow key (
j
) is pressed the volume is reduced one level and
the volume is again set to the NORMAL limit.
2.8.4
Out of Range
If an operator takes a SLAVE TPT unit out of range and the radio connection with the MASTER is
lost, a “NO SERVICE” sound is heard in the headset. At the same time the LED indicates
OUT_OF_RANGE.
