High-definition monitoring switch selection according to its size
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First, the factors that affect switch selection
1, Resolution The common resolution of the camera is 720P, 960P, 1080P... 4K, the large resolution means a large amount of data, which means that the larger the code stream, the greater the required network bandwidth.
2. Coding Protocols In this paper, the H.264 compression encoding protocol has been released based on H.264. However, the mainstream H.264-based devices currently use H.264 as the main reference.
3, bandwidth needs to know is that even if the resolution and coding protocol of the two cameras are the same, but due to the different manufacturers, the code stream of the two videos may be several times different. 
At present, 1.3 million and 2 million pixel cameras are the most widely used. For a 100M switch, it can accommodate up to 1.3 million cameras and 20 cameras and 2 million cameras.
Give everyone an experience value: Video total stream < 60% of network bandwidth, the video can be pleasant and smooth.
Second, the following summarizes some points based on the actual application experience of Fengrunda switches for your reference:
1, Small network monitoring system (1.3 million 20, 2 million 10)
In the small network monitoring system, pure 100M network is enough to support smooth operation. If the points are relatively concentrated and within 100 meters, a star topology is used; if the points are distributed farther, a cascade structure is used.
Actual combat: Fengrun Da PoE switches cascaded with Haikang's 300W cameras, Haikang found its stream 8M, each switch with 2, 3 sets of 300W cameras, the total number of cascading with no more than 8 sets, is completely feasible .
Summary: The key point of small-scale networking is “dedicated to private networksâ€. The key point of selecting switches is “port isolationâ€. Specific approach: Buy a smart switch that can set up a VLAN or a stupid switch with a solidified VLAN. The role is to isolate the broadcast domain and improve transmission efficiency!
2, medium-sized network monitoring system (1.3 million 200, 2 million 100)
The characteristics of the medium-sized network monitoring system are large in scope and its points are basically dispersed.
Access layer can still use 100M switch, small port switch is very easy to use; Convergence layer uses multi-gigabit uplink or full Gigabit intelligent switch, Gigabit port access NVR, can protect 25 -32 large road The recorder's incoming bandwidth.
The number of cameras is more or more centrally distributed. The networking points: The intelligent switch at the aggregation layer sets the VLAN.
Specific approach: Set each NVR and imported IPC as a set of virtual private networks, and 2-3 sets of aggregate Gigabit switches.
The role is to help control traffic, release bandwidth to port applications, and provide flexible management and relative security.
3, Large-scale network monitoring system not only increases the camera load of the monitoring front-end, but also adds the storage server, network video matrix and streaming media server. The most important is integration and integration with other business systems, operation and maintenance management scheduling platform and alarm linkage command system, etc. Linkage networking.
Third, in order to protect high-definition video big data, long-term smooth transmission, how to choose the switch:
1. The number of switch ports is determined by the point and quantity of the IPC.
2. The rate of the switch and the number of cascaded devices, and the bandwidth load table;
3.100M access, solidify VLAN, port isolation broadcast domain;
4.1000M aggregation, multiple NVRs, and VLAN-specific networks.