GAI-Tronics CB193-001 Call Boxes - Manual (Page 18)

Pub.: 43004-031E
Model CB193-xxx, CB194-xxx, and CB195-xxx RF Call Boxes Page 17 of 52
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After the person answering the phone can be heard speaking, press the PTT button or handset pressbar to
respond. When the PTT button is pressed, the front panel status lamp lights green as a signal to talk.
Speak in a normal tone of voice at arm’s length distance from the push button models or into the handset
microphone while holding the pressbar. Release the button or pressbar when finished speaking. The
radio ceases transmission and waits for receive audio. The front panel status lamp returns to steady red
whenever receive audio is present. Continue conversation in a push-to-talk, release-to-listen operation.
The telephone line disconnects after no carrier activity is detected after a pre-programmed time period.
The RF Call Box returns to sleep mode as stated under call box-to-radio operation.
ANI Reporting
A programmable multi-digit ANI code (DTMF) is reported by each unit upon initial PTT activation, if
the unit is programmed for ANI operation. The length of this code is adjustable between two and eight
digits via the CARD Suite Software. The ANI code is only transmitted on the first PTT of a call upon
awakening from sleep mode, unless programmed to transmit on each PTT activation. This reporting
operation requires the use of a receiving device that can decode the transmitted DTMF ANI code
(portable, mobile, or remote desk set or console). N
OTE : Identification ANI reporting is not available in
the call box-to-telephone line or call box-to-call box operation.
Transmit Time Limiting
The transmit time is limited in several ways. First, a momentary depression of the button to initiate a call
results in a minimum duration transmit. The Call Box remains in transmit for a duration long enough for
the entire ANI code to be transmitted followed by a programmable amount of open microphone transmit
time (factory set at 4 seconds). This allows emergency depression and release of the button, yet still
provides the user with a period of time to speak or for the receiving party to hear ambient sounds. For
additional transmit cycles in the same call, the user must press and hold the PTT switch during transmit.
N
OTE : Minimum transit time is not available in call box-to-telephone line operation.
The second transmit time limitation is a maximum transmit time. This duration, which is factory set to
20 seconds, prevents the radio from being damaged and also preserves battery life. When this maximum
time is reached, the PTT button must be released and re-activated to begin transmitting again. Both
transmit time durations are software programmable via the CARD Suite Software.
Low-Power Sleep
A call is terminated when the Call Box returns to its low-power sleep mode or when no receive audio is
present. The controller PCBA disables all of the audio circuitry and places the micro-controller in a low-
power sleep mode. In the sleep mode, power is removed from the radio module to limit current draw
from the power supply or battery to 6 mA.
The Call Box enters its low-power sleep mode after a period of inactivity (no carrier detect and no PTT).
The length of this period (standby time) is preprogrammed using the CARD Suite Software application.
The Call Box wakes from sleep by a PTT activation. As previously stated, the sleep mode operation can
be disabled to provide continuous receive capability (Standby Forever).