Bosch Appliances VG4-200, VG4-300 9VG4 Audio Connections, Audio Line Input Specifications

VG4 Modular Camera SystemVG4 Audio Connections en 65

9VG4 Audio Connections

The audio version of the VG4 AutoDome has one audio input for line signals. The audio signals are transmitted one-way and in-sync with the video signals. As a result, a door intercom system can be connected at the camera location.

NOTICE! The line ports of the intercom should be used for transmitting audio signals on the intercom systems.

9.1 Audio Line Input Specifications

The following Line In specifications should be complied with in all cases:

–5.5 Vpp max. Input voltage Impedance 9 Kohm, typicalSampling rate 8 KHz, 16 Bit, mono

NOTICE! There is an internal gain level adjustment in case the signal level is too low.

9.1.1	Wire Specifications
	Long distances are more susceptible to introducing noise into the signal.
	Wire Type:	Coax wire, AWG is dependant on the connector style selected
	Maximum Distance:	Depends on the signal level

9.1.2	Connections
	The Audio Input must be connected to the Biphase Input as follows:
	1.	Remove the 110 ohm Biphase termination resistor.
	2.	Connect an audio source with line level to the Biphase input of the VG4 as shown in the
		chart below:
			Contact	Description
			Biphase +	Audio In
			Biphase -	Ground

9.1.3	Activating Audio Reception
	To configure audio via the Web browser, do the following:
	1.	Open the IP AutoDome LivePage, then click the Settings tab.
	2.	Click the Camera Settings link from the left pane, then click Miscellaneous. The IP
		AutoDome displays the Audio settings.
	3.	Click the Audio radio button to activate audio over IP.

NOTICE! The audio signal is sent in a separate data stream parallel to the video data, and so increases the network load. The audio data is encoded according to G.711 and requires an additional bandwidth of approximately 80 Kbit/s for each connection.

Bosch Security Systems, Inc. User’s Manual F.01U.133.268 6.0 2010.03