To determine how much throughput is required for a point-to-point wireless link based on the frame rate of a camera, you’ll need to consider a few key factors.

The required throughput depends on the camera’s resolution, compression settings, and the number of cameras sharing the link. Here’s a step-by-step approach:

  1. Camera Specifications: Start by looking at the specifications of the camera(s) you plan to use. Note the following:

    • Camera resolution (e.g., 720p, 1080p, 4K)
    • Frame rate (frames per second, FPS) at which the camera records or streams video
    • Compression settings (e.g., H.264, H.265)

  2. Bandwidth Calculation:

    • Calculate the required bandwidth for a single camera. To do this, use the following formula:
      Bandwidth (in Mbps) = (Resolution width x Resolution height x Bits per pixel x Frame rate) / 1,000,000
    • For example, if you have a 1080p camera recording at 30 FPS with H.264 compression, the calculation might look like this:
      Bandwidth = (1920 x 1080 x 24 x 30) / 1,000,000 = 186.624 Mbps

  3. Total Bandwidth:

    • If you have multiple cameras sharing the same point-to-point link, add up the bandwidth requirements for each camera to determine the total required throughput.
    • For example, if you have three 1080p cameras, each requiring 186.624 Mbps, the total required throughput would be 3 x 186.624 Mbps = 559.872 Mbps.

  4. Consider Overhead:

    • Account for network overhead, which includes factors like error correction, network protocols, and any additional data traffic. This overhead can be roughly estimated at 10-20% of the total calculated bandwidth.

  5. Select the Wireless Equipment:

    • Choose wireless equipment that can support the calculated bandwidth. Keep in mind that real-world throughput may be slightly lower than the equipment’s theoretical maximum due to interference and other environmental factors.  Going with 60 GHz like the GNS-5660 above works well because it avoids all 2.4 GHz and 5 GHz interference.

  6. Frequency Band and Interference:

    • Consider the frequency band you plan to use (e.g., 2.4 GHz or 5 GHz). Higher frequency bands often provide higher data rates but have shorter range and may be more susceptible to interference.  60 GHz is interference free, but requires clear, unobstructed line of sight, and maximum of about 1/2 mile distance.

  7. Antenna and Signal Strength:

    • Ensure that the antennas and signal strength are appropriate for the required distance between the point-to-point wireless devices. Antenna gain and alignment are critical for achieving the desired throughput.

  8. Network Latency:

    • Consider network latency requirements, especially if you are using the wireless link for real-time monitoring or surveillance. High latency can impact the camera’s performance.

By following these steps, you can estimate the required throughput for a point-to-point wireless link based on the frame rate of the cameras you intend to use. It’s essential to select the right equipment, consider network overhead, and account for environmental factors to ensure a reliable and effective wireless connection.

 

Leave a Reply