Coaxial cable specifications
Coaxial cable can be divided into two basic types, baseband coaxial cable and broadband coaxial cable. At present, the commonly used baseband cables have a shielded wire made of copper and a characteristic impedance of 50 (such as RG-8, RG-58, etc.); the shielding layer of cables commonly used for broadband coaxial cables is usually stamped with aluminum The characteristic impedance is 75 (such as RG-59, etc.).
The thick coaxial cable and the thin coaxial cable refer to whether the diameter of the coaxial cable is large or small. Thick cable is suitable for relatively large local networks. It has a long standard distance and high reliability. Since there is no need to cut off the cable during installation, the network access position of the computer can be flexibly adjusted as required. But the thick cable network must install transceivers and transceiver cables, installation is difficult, so the overall cost is high. On the contrary, the installation of the thin cable is relatively simple and the cost is low, but because the cable is cut during the installation process, the two ends must be equipped with a basic network connector (BNC), and then connected to the T-type connector at both ends, so when there are many connectors, it is easy to cause poor contact Hidden danger, this is one of the most common failures occurring in the Ethernet in operation.
In order to maintain the correct electrical characteristics of the coaxial cable, the cable shield must be grounded. At the same time, there must be terminators at both ends to weaken the signal reflection.
Both thick and thin cables are bus topologies, that is, multiple machines are connected to one cable. This topology is suitable for machine-dense environments. But when a contact breaks down, the fault will affect all the machines on the whole cable in series. The fault diagnosis and repair are very troublesome. Therefore, it will be gradually replaced by unshielded twisted pair or optical cable.
The most commonly used coaxial cables are as follows:
· RG-8 or RG-11——50Ω
· RG-58——50Ω
· RG-59——75Ω
· RG-62——93Ω
Computer network generally selects RG-8 Ethernet thick cable and RG-58 Ethernet thin cable. RG-59 is used in TV systems. RG-62 is used in ARCnet network and IBM3270 network.
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