How to solve the monitoring network cable over 100 meters? What should I do more than 300 meters?

A friend asked, what should I do if the monitoring project exceeds 100 meters? Or how can I find the distance from the non-network line?

In actual projects, there is often such a situation. Due to the lack of pre-judgment, when the project is installed in the middle of the project, the distance is long and the network cable is not enough. We know that whether it is Super Category 5 or Category 6 line, it is reasonable. The transmission distance is 100 meters to the left, even if it is a Category 6 standard network cable, it can only be within 120 meters. The ordinary network cable should not exceed 90 meters in engineering construction.

So in the project, how to solve if you need to transmit 300 meters distance, or find the distance is too long? Today we will summarize together in this issue.

Method one, increase the switch

Five types, six categories are 100 meters, if you want to increase the transmission distance, you can install a switch (relay device) between the two twisted pairs, in theory, you can install four switches. If you install 4 switches to connect 5 network segments, the theoretical transmission distance can reach 500m.

For the monitoring project, if the transmission distance exceeds 100 meters, we can add a switch in the middle to relay, and use the Category 6 cable, then the transmission distance is extended by 100 meters, because the switch has the function of amplifying the signal, so that the network signal is strengthened. So it can be used normally.

However, if the distance is 300 meters or 500 meters, adding multiple switches can solve the problem, but the signal may be unstable after the third-stage amplification of the switch. Therefore, the way to increase the switch is to add only two switches to solve the transmission problem within 300 meters.

Method 2, using a fiber optic transceiver

Long-distance network transmission, network signal attenuation is too large, if more than 300 meters distance, a pair of fiber transceivers can be added in the middle. Transmission by fiber is the ideal way, the signal is smooth and stable.

The optical transceivers also need to be paired. The transmitting port (TX) of one transceiver is connected to the receiving port (RX) of the transceiver at the other end, and the optical fiber transmission is used between the transceivers, and the camera terminal is connected to the transceiver through the switch. The network mode is also applicable to large-scale monitoring coverage, and its excellent performance is widely used.

Method three, bridge transmission

If wiring is difficult for many environments, wireless transmission can also be used in the middle, which is simple to install and low in construction cost. It should be noted that the wireless bridges should be visible and there should be no obstacles to block.

There are two ways to use a wireless bridge.

1, point-to-point connection

If multiple cameras are concentrated, you can connect the camera to the switch.

If the camera is scattered and far away, each camera can be equipped with a pair of bridges.

2, point to multipoint

If the angle at which the camera is distributed to the monitoring center is less than 60 degrees, point-to-multipoint transmission may be considered. The transmitter bridge and cost can be reduced.

The two ways of the bridge are used according to different scenarios, such as on the street, in schools, in factories, in office buildings, on construction sites, in parks, in residential quarters, on river banks, at port terminals, and even in forests. , Gobi Desert, etc. As long as there is a need to install a video surveillance system, you can use the wireless video surveillance system, which will use the bridge.

to sum up

1, ease of use

These three methods are used separately. If the transmission distance is within 200 meters, then we can add a switch directly in the middle to continue to use the network cable transmission. If you are far away and do not want complicated wiring, you can use the bridge to Transmission is convenient.

If there is an obstacle between the two places, it is not suitable for wireless bridge networking, then you can consider the use of fiber networking in the middle. The consumables required are a pair of optical transceivers and leather fibers.

2, stability

The switch is relatively stable when relaying two or so signals, and the signal will be attenuated after 3 relays. This is only suitable for short-distance transmission of about 200 meters; bridge transmission saves time and effort, but the stability is slightly worse, subject to various factors. Impact: The optical fiber networking mode is relatively simple. The optical transceivers are used in pairs. One end is connected to the camera, the other end is connected to the equipment room switch, and the optical fiber transceivers are connected by a skin fiber. The cost of fiber optic networking consumables is not high, and it is stable and reliable.