1、 Elevator video monitoring

As an important closed public area and key access channel of buildings, elevator video monitoring plays an important role in the security work of the whole area and is an indispensable part. Elevator video monitoring can grasp the situation in the elevator car in real time to ensure the safety of passengers.

Elevator monitoring video transmission can be divided into wired and wireless.

Wired transmission: the professional elevator traveling cable is adopted. The general traveling cable has serious loss during use, and the service life is between one and two years. The cable of high-rise elevator has high requirements for tensile strength and electrical parameters to prevent impedance mismatch caused by tensile deformation when the cable is loaded with self weight and interference caused by attenuation of signal-to-noise ratio of video signal. It is difficult to replace the traveling cable again, the construction period is long, and the cost of replacing the traveling cable is also high.

Wireless transmission: wireless transmission adopts point-to-point mode. A transmitting point is installed on the lift car and a receiving point is installed at the end of the elevator shaft. Data can be transmitted freely when the elevator car moves. The wireless transmission equipment is easy to install and has a service life of at least 3 years. The bandwidth fully meets the transmission of HD surveillance video.

Method analysis of installing wireless bridge in elevator

Traveling cable

2、 How to deploy

There are two installation methods for wireless transmission of elevator shaft monitoring video. Top mounted and bottom mounted, as shown below:

Method analysis of installing wireless bridge in elevator

The top deployment is suitable for the monitoring center on the top of the building. Generally, the bottom deployment is adopted.

Method analysis of installing wireless bridge in elevator

It is worth noting that all bridges have transmitter and receiver.

3、 How does the bridge network?

The network bridge at the lift car end shall be set to the client mode. In this mode, the network bridge is equivalent to a network card. Convert the video data of webcam from electrical signal to wireless signal.

Networking schematic diagram:

Method analysis of installing wireless bridge in elevator

The bridge at the end of the elevator shaft is set to AP mode. In this mode, the bridge is directly connected with NVR through network cable to directly convert the received wireless signal into wired signal and transmit it to NVR.

To sum up, the bridge near the camera end is set to client mode, and the bridge near the NVR end is set to AP mode.

Before installation into the elevator shaft, the network bridge needs to be matched in advance.

4、 Example of elevator wireless monitoring project

We mentioned the method of installing wireless bridge in elevator. Let’s take a look at the example.

Construction background:

Just received a project of elevator installation and monitoring. There are 8 elevators on 35 floors in a building. The elevator monitoring installed before was to put cables. The customer saw that several security companies around used a new product wireless bridge to replace the network cable, so they did wireless monitoring. So use a wireless bridge!

Installation drawings:

4 lift lift on both sides as like as two peas on the two sides of the corridor. The final connection is to a switchboard and then to the computer room.

Procurement and installation:

Cameras: 8;

8 camera power supplies and 8 power plug-ins;

Hard disk video recorder: 1 set;

4tb hard disk: one;

Wireless bridge: 8 pairs;

24 port switch: 1 set;

A box of 300m network cable!

Four core single-mode fiber 400m

Optical transceiver 1 pair

1 core switch

preparation:

The equipment is in place, in order to be safe. When I was in the store, I set up 8 pairs of 16 network bridges separately. Each bridge is marked with transmit 1, receive 1, transmit 2, receive 2… To avoid mixing, simply use the camera to test whether the image can be produced. Test every camera again and everything is OK.

Overall installation:

The conventional camera installation is not mentioned. Specifically, how to install the bridge! First, fix the bridge transmitter 1 under the elevator car, and connect the POE power supply with 220V power. The POE power LAN port is connected to the camera, and the POE port is connected to the bridge. The final is shown in the figure below:

Method analysis of installing wireless bridge in elevator

After the launch, power on receiver 1 and connect it to the computer.

Connection mode: Poe power supply is powered on, Poe port is connected to the bridge, and LAN port is connected to the computer. The two bridges face each other and lift the elevator upward. The computer tests whether the camera image is stable.

Method analysis of installing wireless bridge in elevator

Method analysis of installing wireless bridge in elevator

If the test is OK, you can install the next elevator. The method is still the same!

Finally, the bridge and camera are installed. Connect all to a switch, and then pull the optical fiber cable to the machine room.

Responsible editor; zl

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