Often friends have such doubts, how many network surveillance cameras can a switch support? Gigabit switches generally connect 2 million network cameras to connect? 24 network heads, can't you use a 24-port 100M switch? Such a problem. Here are some simple analysis of this type of problem!
Choose according to the code stream and quantity of the camera
1, camera code stream
2, the number of cameras
To figure out the bandwidth capacity of the switch. Common switches have hundreds of megabytes of switches and gigabit switches. Their actual bandwidth is generally only 60 to 70% of the theoretical value, so the available bandwidth of their ports is roughly 60Mbps or 600Mbps.
Example: Look at the single stream according to the brand of the network camera you are using, and then estimate how many cameras a switch can connect to.
such as:
11.3 million: 960p camera single stream is usually 4M, with 100M switch, then you can connect 15 (15 × 4 = 60M); with Gigabit switch, you can connect 150 (150 × 4 = 600M).
22 million: 1080P camera single stream is usually 8M, with 100M switch, you can connect 7 (7 × 8 = 56M); with Gigabit switch, you can connect 75 (75 × 8 = 600M) These are the mainstream The H.264 camera is an example for everyone to explain, H.265 is halved.
In terms of network topology, a local area network is usually two to three layers. The end of the camera is the access layer. Generally, a 100M switch is enough, unless you have a lot of cameras connected to one switch.
The aggregation layer and the core layer are calculated according to how many road images are gathered by the switch. The calculation method is as follows: if the 960P network camera is connected, generally 15 channels of images are used, and 100 Mbps switches are used; if more than 15 channels are used, Gigabit switches; if 1080P network cameras are connected, generally 8 channels of images are used, and 100 Mbps switches are used. Eight channels use Gigabit switches.
Switch selection requirements
1. Selection of access layer switches
Condition 1: Camera stream: 4Mbps, 20 cameras are 20*4=80Mbps.
That is to say, the access port of the access layer switch must meet the transmission rate requirement of 80Mbps/s. Considering the actual transmission rate of the switch (usually 50% of the nominal value and 50M of 100M), the access layer The switch should use a switch with a 1000M upload port.
Condition 2: The bandwidth of the backplane of the switch. If you select a 24-port switch with two 1000M ports and a total of 26 ports, the bandwidth requirement of the switch backplane of the access layer is: (24*100M*2+1000*2*) 2) /1000 = 8.8 Gbps backplane bandwidth.
Condition 3: Packet forwarding rate: The packet forwarding rate of a 1000M interface is 1.488 Mpps/s, and the switching rate of the access layer is: (24*100M/1000M+2)*1.488=6.55Mpps.
According to the above conditions: When there are 20 720P cameras connected to a switch, the switch must have at least one 1000M upload port and more than 20 100M access ports to meet the demand.
2, the choice of aggregation layer switch
If there are 5 switches in total, each switch has 20 cameras and the code stream is 4M, then the traffic of the aggregation layer is: 4Mbps*20 *5=400Mbps, then the upload port of the aggregation layer must be 1000M or more.
If 5 IPCs are connected to a switch, an 8-port switch is generally required. Does the 8-port switch meet the requirements? Can look at the following three aspects:
Backplane bandwidth: Port number* Port speed*2=Backplane bandwidth, ie 8*100*2=1.6Gbps.
Packet exchange rate: port number * port speed / 1000 * 1.488 Mpps = packet exchange rate, that is, 8 * 100 / 1000 * 1.488 = 1.20 Mpps. The packet exchange rate of some switches is sometimes calculated to fail to meet this requirement. Therefore, it is a non-wire-speed switch, which is prone to delay when performing large-capacity throughput.
Cascading port bandwidth: IPC code stream * number = minimum bandwidth of the upload port, that is, 4.*5=20Mbps. In general, when the IPC bandwidth exceeds 45Mbps, it is recommended to use a 1000M expansion port.
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