Full-line switch configuration uplink Gigabit optical port 1) The monitoring industry usually uses non-network management switches as camera access. Ordinary non-network management switches are designed for PC networks. Therefore, ordinary non-network management switches are not equipped with optical ports, but the basic items for monitoring security are basically It is necessary to connect the optical port to the equipment room, so only one pair of photoelectric converters can be added. A pair of photoelectric converters (must be used in pairs) Taobao must buy more than 100 to 200 pieces, all made by the Shenzhen cottage factory, the failure rate is very high, the wiring is still chaotic, to connect 1 power supply, 1 twisted pair Line, 1 fiber line. Our approach is: all the monitoring switches are equipped with fiber interfaces, all of which are Gigabit. 2) Gigabit models are equipped with 2 ports, which can be used to facilitate one optical port to be connected to one switch below, and the other optical port is used to connect to the machine room. 3) Now the resolution of the camera is getting higher and higher, and the traffic is getting bigger and bigger. The traditional 100M non-network management switches are all equipped with 100-megabit ports. Because the traffic in the PC network is relatively small, many projects use video cards after discovery. Time, delay, etc., so now everyone uses all Gigabit. But in fact, the flow of the camera does not exceed 2-8M (1 megapixel 2-4 megabytes, 2 megapixels 4-6M, 3 megapixels 6-8M), 100 megabit access must be enough, the problem is If you still use hundreds of megabytes in the uplink, it must not be enough (for example, 10 channels of 3 million pixels, the average flow rate is 80M, considering that the camera has sudden traffic, most of them are not enough), so we configure all on the 100M switch. Gigabit on the link. Large cache design Many people use TP or D-Link switches in the project, which is obviously Gigabit. It only takes 3-5 channels. Why is there a delay? What about Caton? This has nothing to do with switching capacity, backplane, and packet forwarding rate. The core reason is the internal cache size. Many switches of TP and D-link are home-class. Although it is Gigabit, the cache is very small, usually around 512K. Although the average traffic of the camera is 2-8M, there will be a burst of traffic at intervals (one customer will doubt this, the burst traffic is determined by the H.264 compression technology of the monitoring, very very certain, in the laboratory The actual packet capture can be seen, there must be confidence), the switch will not handle the burst traffic, it will put the cache to wait for a while, the home switch cache is too small, the cache will be full, the data will be discarded, the camera is needed. It is sent again, so the image is delayed for a long time on the monitor (image delay is a very common problem of monitoring, and it is delayed by a dozen seconds in severe cases). Our approach is: So the monitoring switch, except the lowest 2 are 2M cache, the other is 4M cache. Basically able to solve this delay problem. Adapt to harsh environments The monitoring switch is used in engineering projects, the environment is actually worse than the PC network, but the ordinary PC network switch also reduces the quality requirements in order to reduce the cost. For example, the normal 1 year warranty, 0-40 degree working range, our monitoring switch is 0. -50 degree working range, 3 year warranty, the product is also designed within a ratio of 3 years within the failure rate (usually within 0.5%). Flow control switch design Flow control is not very useful in video surveillance, but it is recommended to open it in the video access control. After opening, the switch will open the flow control function to ensure the unlocking command transmission function, so as to prevent the remote unlocking. If an ordinary corridor switch is used, the large amount of visual intercom traffic will cause the door opening command to be discarded during transmission. When the user presses the door open button, the door of the stairway cannot be opened and the owner complains.
Ethernet cables connect devices such as PCs, routers, and switches within a local area network.Most technicians refer to these standards as CAT5 and CAT6, respectively. Also CAT3 available. Because of this, many online stores that sell network cables use this abbreviated language as well.
The connector can by shield or non-shield type, raw cable can be UTP, STP, FTP type. Also the molded shape can be custom mould by straight, right-angle, 105 degree, etc.
These physical cables are limited by length and durability. If a network cable is too long or of poor quality, it won't carry a good network signal. These limits are one reason there are different types of Ethernet cables that are optimized to perform certain tasks in specific situations.
Ethernet Cable Wiring,RJ45 cable,networking cable,8P8C cable ETOP WIREHARNESS LIMITED , https://www.oemwireharness.com
