Tag: Midspans

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Missing Streams on Under Powered Multi-Sensor Cameras or Multi-View Devices

Description 

Loss of video streams have been observed on multi-sensor cameras and multi-view devices because of the camera or device being under powered.

Product 

  • AXIS FA54 Main Unit

Expected Results 

All video streams should connect and stream video

Actual Results 

3rd and 4th streams would occasionally disconnect and stop streaming

Solution

Follow the device manufacturer’s power recommendations and consider adding items such as a Midspan Power Injector when dealing with extreme distances.

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Connecting cameras over 100m in distance from G-Series PoE or Una recorders

ExacqVision G-Series PoE and Una recorders provide Power-over-Ethernet (PoE) ports for direct connections to cameras, rather than accessing cameras through a switched network.

The TIA/EIA 568 standard provide that the maximum allowable length of a Cat5/5e or Cat6 cable is 100 meters (328 feet) for ethernet networks. To connect a camera farther than 100m away, the network connection must be extended using a method other than a network switch.

The following information explains the trade-offs of using various extender/repeater, midspan and injector technologies to extend the network.

PoE and PoE+ Injectors and Midspans

Advantages:

  • Extends the network segment over 100m
  • Provides additional PoE power, reducing the PoE power drawn from the recorder; useful when the combined power draw of all cameras would exceed system limits:
    • 8-port G-Series PoE, Gen2 – 15 watts per port; 120 watts total
    • 16-port G-Series PoE, Gen2 – 15 watts per port; 240 watts total
    • 4-port G-Series PoE, Gen1 – 15 watts per port; 60 watts total
    • 8-port G-Series PoE, Gen1 – 15 watts per port; 120 watts total
    • 16-port G-Series PoE, Gen1 – 15 watts per port; 240 watts total
    • 8-port Una – 25 watts per port; 120 watts total
    • 16-port Una – 25 watts per port; 240 watts total

Disadvantage:

  • Recorder cannot power cycle cameras that are receiving PoE power from the injector or midspan.

PoE and PoE+ Extenders/Repeaters

Advantages:

  • Extends the network segment over 100m
  • Powered by recorder PoE power; does not require a separate power supply.
  • Cameras can still be rebooted from the ExacqVision Desktop Client PoE port management page.

Disadvantage:

  • A small amount of PoE power from recorder is consumed by the in-line extender, reducing power available to the camera.


Exacq Technologies does not test or make specific recommendations for products to extend ethernet networking.

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