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How to choose poe switches in different levels of the monitoring system?
Calculation based on 1080P network cameras with a 4M bitstream: In different levels of the monitoring system, the selection of switches is as follows:
Access layer switch:
Theoretical number of accesses: Generally, the actual bandwidth of commonly used switches is 50%-70% of the theoretical value. The actual bandwidth of a hundred-megabit port is 50M - 70M. Calculated according to a 4M bitstream for each camera, 4M × 12 = 48M. So, theoretically, a hundred-megabit access switch can access a maximum of 12 1080P network cameras.
Actual recommended number of accesses: Considering that network monitoring uses dynamic coding methods and the peak bitstream of cameras may exceed 4M bandwidth. At the same time, to ensure the stability of the system and bandwidth redundancy, it is recommended that a hundred-megabit access switch control within 8 1080P network cameras. If more than 8 cameras, it is recommended to use a gigabit port switch.
The vast majority of network cameras are basically equipped with POE. As a result, for systems at the access layer with fewer than 10 channels, hundred-megabit POE switches are generally employed. For monitoring systems with more than 10 channels, gigabit POE switches are utilized.
Aggregation layer switch:
Bandwidth demand calculation: Suppose there are 6 1080P network cameras on each access layer switch connected downstream of the aggregation switch. Then, the total bandwidth of one access layer switch is 4M × 6 = 24M. If the aggregation switch is connected downstream to 5 access layer switches, the total bandwidth under this aggregation switch is 24M × 5 = 120M.
Interface selection: Therefore, the cascade port between the aggregation switch and the core switch should be a gigabit port to meet the data transmission requirements.
Core layer switch:
Functional requirements: The core layer switch mainly connects downstream aggregation layer switches and connects upstream to video monitoring platforms, storage servers, digital matrices and other devices in the monitoring center. It is the core of the entire high-definition network monitoring system.
Switch selection: Due to the large bandwidth requirements of 1080P network cameras, in order to ensure the stable operation of the entire system and the smooth display of video images, it is recommended that the monitoring center choose a full gigabit port core switch. If there are many points and VLANs need to be divided, a three-layer full gigabit port core switch should also be selected.
In a single-layer network monitoring system, the NVR is connected to the UPLINK port of the POE switch. In a multi-layer network monitoring system, the NVR is connected to the gigabit port of the aggregation layer switch or is connected to the core layer switch.
Only when the NVR is connected to a gigabit port can it achieve the maximum bandwidth access.
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