Verint Nextiva S1100, Руководство пользователя

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3: Configuring and Installing the Device
28 Verint Video Intelligence Solutions
The PTT/PTL transmission mode uses the I/O pins; therefore, you cannot program alarms
and PTT/PTL at the same time. PTT/PTL requires a specific hardware configuration:
„
To activate the audio reception circuit (for PTL) on receiver devices, you have to short
the alarm input 1 dry contact and the alarm ground signal. You cannot activate PTL on
transmitters. Remember to change the input 1 setting for audio use in the
Configuration Assistant (see page 37).
„
To activate the audio transmission channel (for PTT), you must trigger an activation
switch (for example, a button) that is based on the shorting of the alarm input 2 and
alarm ground signals.
If both the transmitter’s and receiver’s PTT switches are activated at the same time, the
receiver will have precedence: Audio will be transferred from the receiver to the
transmitter. If the receiver’s PTL and PTT functions are activated at the same time, PTT will
be activated and PTL will be ignored.
Here is a typical PTT/PTL application:
Regardless of the audio mode (PTT/PTL or full duplex), you need to connect the audio
equipment on both devices:
„
You plug the audio input signal of the device to the Line-out connector on a
pre-amplifier. Then you plug a microphone on the pre-amplifier.
„
You plug the audio output signal of the device to the Line-in connector on an amplifier.
Then you plug a speaker on the amplifier.
The audio input/output specifications are:
Alarms
The receiver and transmitter devices can generate alarms (or events). Typically, an alarm
will be generated on a transmitter and acknowledged on a receiver.
Mode Gain Impedance Frequency range
Input -20 to -3 dBV 30 kohm
300–3600 Hz
Output -45 to -3 dBV 8 ohms min.
Audio In
signal Audio Out
signal
PTL
Gnd and In 1
terminals
PTT
In 2 and Gnd
terminals Audio In
signal
PTT
In 2 and Gnd
signals Audio Out
signal
-T -R