Problems needing attention in engineering wiring

Engineering design will have a decisive impact on the whole wiring process, therefore, the designer should carefully and carefully, do a full investigation, collect relevant information (including some of the building drawings, decoration drawings and other works of information, as well as wiring information, etc.), and should take full account of economic conditions, application needs, The construction progress request and so on each aspect.

Engineering wiring should pay attention to the following points:

First, wire purchase

In general, we recommend audio and video transmission options using 75 ohms (64 line shielding network) coaxial cable, network data transmission selection of Super Five type twisted pair shielding line, BNC connector selected 75 ohms (can be welded) or 50 ohms (available screws fixed) two kinds.

Second, audio and video line laying

Three, baseband coaxial cable

Coaxial cable with hard copper wire as the core, outsourcing a layer of insulating material. This insulating material is surrounded by a dense woven mesh conductor and covers a protective material outside the net. There are two types of coaxial cables that are widely used. One is a 50 ohm cable for digital transmission, which is also called baseband coaxial cable due to the use of the base belt, and the other is a 75 ohm cable for analog transmission. We usually choose the 75 ohm cable because most of the camera output signal is analog signal, so the anti-interference ability is strong. When connected to the BNC connector, it is necessary to keep the connector tightly connected to the thread, and it is absolutely not allowed to have the exposed part of the thread, or it may burn the camera or NVS the motherboard. (Computer science)

Four, network line laying

Wiring diagram: It verifies the correct line to connection. Must comply with EIA 568A or 568B definition.

Length: length refers to the physical length of the connection. After including the maximum error of the NVP value specified by the cable manufacturer and the error caused by the TDR technique used to measure the length, the error limit for the length of measurement is:

channel:100m+15%x100m=115m

Basic link:94m+15%x94m=108.1m

Note: TIA (Communications Industry Association) has developed the Eia/tia 568A TSB-67 Standard, which is suitable for the installed twisted pair cable Connection network. The connection model standard defined in TSB-67 defines two connection model channel and basic connections (basic link). Channel defines the standard transfer requirements for end-to-end (including user-end cables)

Example: The room floor route plan

Route 1: Open type socket

The use of open socket, the size of the socket is equivalent to One-nineth of the motherboard (that is, a sub-board size), the side of the socket and the main board corner of the same groove, cover plate can be directly mounted on the corner of the socket, so that the socket and the floor fixed together.

Advantages: Simple operation, simple manual sawing, screwdriver can easily complete wiring progress, general 300-500 Point/day/open type socket capacity larger than ordinary sockets, wiring unit cost greatly reduced

Scope of application: it is recommended that all strong electricity use open type socket, some important weak point of information use open type socket.

Route 2: Walk the line port

At any location on the motherboard or cover, open the 50mm round hole and match the plastic to the line mouth. Flea power can be directly worn out using, strong electricity can be drawn after the strip, or lead to cut off the bottom of another plastic panel.

Advantages: Low cost, 2-3 yuan/A large number of threading, a hole can be out of 5-10 cable construction simple, ordinary open hole tool can be completed, progress up to 800-1000 points/day/person

Scope of application: All the weak points can be used in this way, some of the strong TV situation can also use the Walk line mouth

Route 3: Ordinary pop-up socket

In the room any position according to the need to the bounce-type socket fixed on the ground, paving the floor in the process of meeting the socket that is cutting the floor.

Advantages: 1, to be able to use all the market on the pop-up socket, easy to purchase, low cost.

2, according to the need for arbitrary wiring, not limited to the position and shape of the floor.

Scope of application: all the strong and weak electric information points (only for 50mm height floor)