GAI-Tronics CB193-001 Call Boxes - Manual (Page 30)

Pub.: 43004-031E
Model CB193-xxx, CB194-xxx, and CB195-xxx RF Call Boxes Page 29 of 52
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Transmit Time Out
Step Action Response
1 User presses and releases PTT
button Call Box wakes from low-power sleep mode, checks transmit
channel activity and status lamp slowly flashes red to indicate
unit is operating.
2 No transmit channel activity is
detected Call Box keys radio and initiates communication with
PL1877A. Status lamp slowly continues to flash red to
indicate unit is operating.
3 PL1877A is detected and Call
Box dials phone number Call Box dials preprogrammed number. Status lamp slowly
flashes red to indicate unit is operating.
4 Number dialed complete Status lamp stops flashing red. Ring or busy signal is
broadcast over speaker.
5 Phone connection complete Incoming audio is broadcast over the Call Box speaker or
handset receiver and the status lamp lights steady red as a
signal to wait and listen (receive audio present).
6 User presses PTT button Call Box keys the radio and checks transmit channel activity.
The status lamp lights red to indicate “wait” period. With no
activity detected, a “go-ahead” splash tone is heard on the
speaker or handset receiver and the status lamp lights green as
a signal to begin talking. Call Box transmits audio to
PL1877A while timing the transmit duration.
7 User speaks into the
microphone Call Box transmits audio over the radio and times the transmit
duration.
8 Maximum transmit time
reached Call Box un-keys the radio, the status lamp is off, and it emits
a “transmission-terminated” tone over the speaker or handset
receiver. The user must now release and repress the PTT
button in order to continue transmission.
9 Transmit channel becomes
available Call Box proceeds as in steps 5 through 9 in “Normal Use”
section.