Network monitoring receiving mode

0 1, webcam+power supply+network cable

In the integrated wiring, the power cord and the network cable should be laid at the same time, and the power supply can also take 220V AC nearby, which can save the power cord, so its advantages and disadvantages will not be discussed here for the time being. Power each webcam. Another network cable transmits the network data to the network hard disk video recorder NVR.

02. Webcam +POE switch

Compared with the previous method, this method saves a power cord, and the network camera only needs a network cable as the medium to transmit signals, so the power cord is no longer used. Just use unshielded super-category 5 twisted pair for the network cable, and there is no problem with the transmission distance of 100 meters.

Why the mainstream use of PoE switch as network monitoring system now has the following advantages: 1, saving wires, saving wiring time, saving wiring labor and improving engineering construction efficiency. 2. There is no power supply, strong electricity does not intervene, and there is no danger of electric shock, which reduces the failure probability and maintenance cost. 3, the construction difficulty is reduced, and it is simple and convenient, and the use is convenient, and the engineering wiring is more beautiful.

03. Webcam+Fiber+Transceiver

As we said just now, the transmission of network cable is normally within 100 meters, so when it exceeds 100 meters, we will generally consider using optical fiber for transmission. Optical fiber not only has a long transmission distance (20 kilometers), but also has a stable effect.

As we all know, when optical fiber transmits data, the data signal is converted into optical signal for transmission, and then the optical signal is converted into data signal, so we use the cooperation of optical fiber transceiver to complete the work. Optical fiber is widely used in monitoring engineering because of its low price and long transmission distance. However, the optical fiber needs to be welded, and the ultrasonic welding machine is expensive, so it usually needs someone to weld it, which takes a certain amount of money and time. Optical fiber transceiver is divided into 100M and Gigabit, which can be selected according to the number of cameras.

04, camera+wireless bridge

In the specific monitoring system implementation environment, if wiring difficulties encounter natural obstacles or insurmountable obstacles, we can adopt wireless transmission mode, thus using wireless bridges.