TYPE 401 AUDIO/VIDEO VERIFIER

Many modern network control and monitoring installations are required to handle a large number of video and audio channels with minimal operating staff. Under these conditions it is often difficult to consistently verify the integrity of all channels manually.

The Type 401 Video/Audio Verifier was designed for Drake Automation Ltd. (now part of Harris Corp.) to overcome this problem by providing continuous automatic monitoring for abnormal signal conditions. Up to sixteen Verifiers can be housed in a single 3-U rack-frame, each module taking one composite analogue video and four analogue audio feeds. A 3-U rack frame with three modules fitted is pictured. It can provide the following separate and configurable alarms.

THE 401 VERIFIER WILL DETECT:

• Video picture-freeze
• Video black
• Loss of Sync
• Audio 1 silence
• Audio 2 silence
• Audio 3 silence
• Audio 4 silence

Detection Criteria

When it comes to detecting frozen images, you’ll need different detection criteria for a caption-based information service than for a movie channel. Similarly, audio silence detection parameters for a classical music service will most likely need to be different to those for a speech-based service, or a pop-music channel. The Type 401 detection parameters may be dynamically user-configured via an RS-485 serial port. The frame also houses a PSU and a controller card. This acts as an alarm concentrator and configuration interface for the rack-frame, and also provides the user serial port for external connection to an SNMP Agent, such as the Type 101 Agent, or a control GUI. There is also a front-panel mounted RS-232 test and configuration port.

Packaging

The 401 system consists of a 3-U self-powered rack-frame, which can house up to 16 cards. This means that a single frame may monitor a total of 16 video and 64 audio channels. For serial communication purposes each card in a frame is individually addressable. Also up to 16 frames may be daisy-chained, each frame having its own unique address, set from a DIP selector switch on the controller card.

Specifications

• Power: 80-250Vac 40-60Hz 40VA Max
  
• Video Input: 1V p-p into 75R PAL or NTSC per channel *
  
• Audio Inputs: 4 x balanced 0dBM into 600R per channel or unbalanced 100mV p-p into 50K per channel. (15-way D connector)
  
• Outputs: Seven volt-free relay contact closures per channel (9-way D connector):
  • Video still-frame detect
  • Video black detect
  • Video loss of sync detect
  • Audio 1 failure detect
  • Audio 2 failure detect
  • Audio 3 failure detect
  • Audio 4 failure detect
  • RS-485 multi-drop serial port
    
• Configuration:
  • Video noise tolerance
  • Video alarm integration time
  • Active video area
  • Audio threshold (x2 pairs)
  • Audio alarm integration time (x4)
    
• Dimensions: 3-U x 440mm wide x 400mm deep

ALL PRODUCT ENQUIRIES TO HARRIS CORP.

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© Amcro Technology Ltd./Harris Corp. 2006

Amcro Technology Ltd.
1 Lambourne Way
Thruxton
Andover
SP11 8NE UK