1. Brand-specific wiring products
Network products used in wiring, such as ordinary Category 5 twisted pair cables or crystal plugs, transmit weak signals, and the overall performance of network communication may be affected if they are not careful. Although the wiring products produced by different manufacturers have some differences in performance and quality, such as the quality of network cables produced by some manufacturers is better, the crystal plugs produced by some manufacturers have better use effects, and the network interface modules produced by some manufacturers are also good, but the author still recommends using the same brand of wiring products in the same wiring system, because this can ensure maximum compatibility.
Many wiring people often simply think that if those good network products are combined for wiring, the attenuation of network signals will be minimized and the communication effect will be achieved. In fact, this understanding is incorrect, because the impedance of the internal materials of network products from different manufacturers is different, and the slight difference in impedance may have a great impact on the signal attenuation of high-speed networks, thereby affecting the communication quality of the entire network system. Practice has proved that mixing wiring with products from different manufacturers has little effect on network exchanges below 10Mbps, but if it is a network system of 100Mbps or higher, it will have a significant impact. Therefore, network products produced by the same manufacturer are used for wiring.
2. Reasonable design before wiring and strict testing after wiring
This is a work habit problem. The importance of good work habits can be more reflected in network wiring. Reasonable planning before wiring can greatly improve the efficiency of the network, otherwise it will seriously affect the efficiency of the network.
In the design stage, the needs of information system users are not fully considered, and sometimes the situation is very bad. For example, the cable trunk connecting telephones and computers to the building can be guaranteed, but the connection of other building systems or equipment, such as fax machines, clocks, security and fire alarm systems, elevators, property department systems, etc. is often overlooked. In order to avoid this situation, a detailed checklist of information systems and equipment can be compiled and provided to each department head before the system is designed, so that they can participate in the supplement. In this way, the above situation can be avoided.
But in fact, it is difficult to guarantee that this situation will not happen again, because with the increase in user business volume and the change in business nature, the use needs of employees will also change. Employees’ office locations will be adjusted within or between departments, and departments will also change their layout. The designed cable facilities should be able to cope with these conditions. The best way is to plan general cable facilities suitable for equipment. Unused spaces should also be laid with cables for future use. The cable facilities in each workroom should be able to meet the needs of any user.
3. Correctly understand the definition of the 100m limit on the channel in the regulations
Everyone knows that the length of a single-segment network cable of Category 5e and Category 6 cables cannot exceed 100m, which is stipulated in the ANSI/EIA/TIA-568 standard. But here we must correctly understand the meaning of this 100m. According to the standard, this 100m should be the limit of the entire transmission channel of the horizontal segment, that is, the management subsystem + horizontal subsystem + work area subsystem. Except for the cross-connection of the management subsystem and the 10m required for the work area connection cable, the actual length of the pre-buried horizontal subsystem is usually only 90m, which is the basic transmission link length.
It can also be simply understood as follows: the entire transmission channel from the RJ-45 port of the work area network adapter to the active connection device (switch, etc.) is 100m (including jumpers).
4. Correctly select the communication cable wires for each part
In the actual integrated wiring project, users often only pay attention to computer networks or immediate applications, but lack sufficient attention to some important but not very obvious needs or future applications. For example, the pre-built wiring cable structure in the building does not match the actual cable facilities to be used, which will cause great delays in construction and cost increases. Architects and electrical engineering companies are usually not familiar with the specifications and requirements of various types of wires. If the design does not meet the specifications, the result may be that the existing threading tube cannot accommodate the cables to be installed, and additional threading tubes must be added, or the threading tube has too many bends and there is no connection box, making it difficult to thread the cable, or using cable trays and connection boxes, but the length of the horizontal cable exceeds the requirements of Category 5 cables.
