The selection of cables should be considered comprehensively based on the requirements of the system, technical performance, and investment estimates. The cabling system should first determine the type of cabling used and the cabling composition (shielded, non-screened, cabled, or used together). Cables typically consist of 2 to 1800 wire pairs. Large logarithmic cables are commonly used in trunk wiring systems and are suitable for use in voice and low-rate data applications. They are the largest in trunk and horizontal (hub-to-desktop) cabling systems. The length is specified in the international standard ISO/IEC IS 11801. It should be noted that these maximum length restrictions are applicable to all media, but do not consider performance due to the different cable types and protocol types used in the network. The effect of the difference. In fact, the maximum cable length will depend on the application of the system, the type of network, and the quality of the cable.
In addition, the choice of cable category should be considered in conjunction with the application requirements of the cabling system. Super five systems can support the operation of Gigabit Ethernet, and super five systems from different vendors can interoperate with each other; six types of prices are more expensive than the super five, but their bandwidth is increased by 25%, and the transmission rate is obvious. With the increase, the six types of systems are dedicated, and the components of each manufacturer have their own unique design and performance indicators. The possibility of interoperability among components of different manufacturers is small, and the indicators of components are still under study; the use of Category 6 cables should be selected. The plug-in devices produced by the same level and merchants, because the six types are dedicated pieces, the products of various manufacturers cannot communicate with each other.
The choice between shielded and unshielded cables depends on the external electromagnetic interference. When the interference field strength is lower than 3V/m, the protective measures are generally not considered. If the interference signal exceeds the standard quantity, shielded cables can be selected. The price of shielded cables is 1.2 to 1.6 times that of unshielded cables. Therefore, the shielded cable is suitable for areas with severe electromagnetic interference and places with high requirements for confidentiality.
At the same time, the wiring system must not only take into account the current needs, but also properly take into account the future development, can not ignore the impact of external factors. Just like the foundation of a building, the basic role of a cabling system in an intelligent system determines that once it is built, it cannot be changed in the short term, and the cabling system has a long life cycle of 15 to 25 years.
In addition, the choice of cable category should be considered in conjunction with the application requirements of the cabling system. Super five systems can support the operation of Gigabit Ethernet, and super five systems from different vendors can interoperate with each other; six types of prices are more expensive than the super five, but their bandwidth is increased by 25%, and the transmission rate is obvious. With the increase, the six types of systems are dedicated, and the components of each manufacturer have their own unique design and performance indicators. The possibility of interoperability among components of different manufacturers is small, and the indicators of components are still under study; the use of Category 6 cables should be selected. The plug-in devices produced by the same level and merchants, because the six types are dedicated pieces, the products of various manufacturers cannot communicate with each other.
The choice between shielded and unshielded cables depends on the external electromagnetic interference. When the interference field strength is lower than 3V/m, the protective measures are generally not considered. If the interference signal exceeds the standard quantity, shielded cables can be selected. The price of shielded cables is 1.2 to 1.6 times that of unshielded cables. Therefore, the shielded cable is suitable for areas with severe electromagnetic interference and places with high requirements for confidentiality.
At the same time, the wiring system must not only take into account the current needs, but also properly take into account the future development, can not ignore the impact of external factors. Just like the foundation of a building, the basic role of a cabling system in an intelligent system determines that once it is built, it cannot be changed in the short term, and the cabling system has a long life cycle of 15 to 25 years.
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