Factors Affecting The Choice Of Switch Bandwidth

- Nov 04, 2020-


1. The number of cameras


Each surveillance camera must occupy a certain amount of bandwidth to transmit audio and video signals. The larger the number of corresponding cameras, the greater the bandwidth occupied. Everyone knows that switches are divided into 100M and Gigabit, which refers to the maximum transmission bandwidth capacity of the switch. The maximum number of surveillance cameras that can be connected to each switch depends on the maximum transmission bandwidth of the switch and the code stream of the cameras.


2. The stream of the camera


The code stream of a camera can be understood as the bandwidth required by a single surveillance camera to transmit audio and video signals. A camera has different transmission bandwidths according to the different resolution selected. The higher the resolution, the larger the bandwidth occupied by the transmission.


3. Compression format


The surveillance camera has an important parameter video coding standard. H.265 occupies a smaller bandwidth than H.264, almost half of H.264. Therefore, if the video coding standard of the camera is H.265, the bandwidth occupied is half that of H.264.


4. The theoretical and actual bandwidth of the switch


It should be noted that there is a certain gap between the theoretical transmission bandwidth of the switch and the actual transmission bandwidth. For example, the actual transmission bandwidth of a 100M switch can only reach about 60% of the theoretical transmission bandwidth. More switch knowledge is available on the Aike Business Network. When we calculate, we use the actual transmission bandwidth to calculate. Therefore, the actual transmission bandwidth of a 100M switch is 100M*60%=60M. The actual transmission bandwidth of the gigabit switch is 1000M*60%=600M.

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