For any PoE IP CCTV network, the following types of links are there:
(1) Camera to switch/NVR - This needs bandwidth around 1 mbps per megapixel resolution when using H265+ codec
(2) Switch to Switch links (in Backbone Network) - This is dynamic and depends on the camera quantity and load connected towards the camera side. The bandwidth required is N times what is per camera bandwidth indicated in (1) and will change with time as installation grows.
(3) Switch to NVR - This may need speed based on NVR capacity but can be assumed to be 10 mbps/channel in either direction. A 32 channel NVR will need peak 320 mbps bandwidth in either direction.
For (1), throughput is not of a big concern and 100 mbps is more than enough. Its speed testing may be entirely skipped as practically no more than 10 mbps ever gets used even with a 8 MP camera. But for (2) and (3) each link should be verified to be at least 1 gbps capable.
iPerf is the best command tool to validate the capability on link performance and should typically yield 930 mbps+ in either direction (when done individually). We recommend that during or after installation an iPerf testing (using two laptops) on such links be done to avoid running into hard to debug obscure problems later.
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