Method analysis of candidate distribution switch when doing small network monitoring scheme
When doing a small network monitoring solution, you often need to choose a switch, but is it a 100M switch or a Gigabit switch? Direct Welded Plastic Shell Integrator Direct Welded Plastic Shell Integrator,Micro Module Integrator,Potting Module Integrator,Direct Welded Modular Integrator Zibo Tongyue Electronics Co., Ltd , https://www.tongyueelectron.com
Xiaobian teaches you to calculate the code rate! 1 actual bandwidth?
The actual bandwidth of our commonly used switches is 50%-70% of the theoretical value, so the actual bandwidth of a 100M port is 50M-70M. How much bandwidth does each camera need? Let me introduce you to a concept - code rate. The code rate is a parameter that describes the amount of video data. The unit is usually Kbps, which means how many Kbs of data per second. If you set this parameter to 1024, the unit can be converted to Mbps, which is how many Mb of data per second. 2 commonly used bit rate - H.264 For Hikvision H.264 network cameras, when calculating the bit rate value, it is usually necessary to add the main stream size and the sub-stream size. (*The main stream is generally a high-definition screen for recording and single-screen display; the sub-stream is generally a standard-definition screen for network transmission or multi-screen display, usually 0.5M.) The common code rates of cameras with different pixels are as follows:
100W/130W =2.5M200W=4.5M300W=6.5M
If you use a 100M switch, the actual bandwidth is 50M:
50÷2.5=20
That is, you can connect 20 100W/130W cameras 50÷4.5=11, you can connect 11 200W cameras 50÷6.5=7, you can connect 7 300W cameras 3 commonly used bit rate-H.265H.265 technology to let the stream Halve, the common code rate of cameras with different pixels is as follows:
200W=2.5M300W=3.5M400W=4.5M
The same is a full 100 Mbps switch, calculated with 50% utilization, 50 ÷ 2.5 = 20 can be connected to 20 200W cameras 50 ÷ 3.5 = 14 can be connected to 14 300W cameras 50 ÷ 4.5 = 11 That can be connected to 11 400W cameras. It can be seen from this that H.265 technology not only halved storage, but also halved the bandwidth pressure and saved switch resources. 4 Gigabit switches or Gigabit ports? Usually, only one or two ports of the access layer (mainly connected to the camera) switch can be gigabit ports. Because the network port connected to the camera only needs to meet the code stream transmission of the corresponding single camera, it usually does not exceed 10M. The network port with higher pressure is the network port that collects data connection to the video recorder or other aggregation device. The data volume of this network port is the sum of the bit rates we calculated before. If the sum of the code rates exceeds 50M, you only need to purchase one or two switches with a network port that is a Gigabit Ethernet port. * Note that Gigabit Ethernet ports are usually used with Super Category 5 or Category 6 network cables. * Due to the different actual bandwidth utilization of different switches, the above data has space for floating up and down.