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Twisted-pair common has three kinds of lines, five types of line and line of the super five types, and the latest 6 class line, thin wire diameter and thick which wire diameter, and the former model is as follows:
1) type of line: mainly used for transmitting voice (a kind of standard is mainly used in the early eighty s before the telephone cable), different from the data transmission.
2) the second line: transmission frequency of 1 MHZ, used for voice transmission and transmission rate highest 4 MBPS data transmission, is common in use 4 MBPS specification token passing protocol of the old token ring.
3) three line: refers to the current in the ANSI and EIA/TIA568 standards specified in the cable, the cable transmission frequency of the 16 MHZ, used for voice transmission and high transfer rate of 10 MBPS data transmission is mainly used for 10 base - T.
Line 4) four types: the cable transmission frequency of 20 MHZ, used for voice transmission and high transmission rate of 16 MBPS data transmission is mainly used for local area network (LAN) based on the token and 10 base-t / 100 base-t.
Line 5) five categories: this kind of cable increases the winding density, coat a kind of high quality insulation material, transfer rate is 100 MHZ, used for voice transmission and high transfer rate of 10 MBPS data transmission, it is mainly used for 100 base-t and 10 base-t network. This is the most commonly used Ethernet cable.
6) super five lines: the five types of small attenuation, less crosstalk, and has higher attenuation and crosstalk ratio (ACR) and signal-to-noise ratio (Structural Return Loss), smaller error, time delay performance is greatly improved. Super five types of line is mainly used for one billion - bit Ethernet (1000 MBPS).
7) line of six categories: this kind of cable transmission frequency of 1 MHZ to 250 MHZ, six wiring system comprehensive attenuation at 200 MHZ crosstalk ratio (PS - ACR) there should be a larger allowance, it provides 2 times in five categories of bandwidth. The transmission performance of six kinds of wiring is higher than the super five kinds of standards, the most suitable for the application of transmission rate is higher than 1 GBPS. Six and five types of an important difference: improved performance in terms of crosstalk and return loss, for a new generation of full duplex high-speed network applications, good return loss performance is very important. Six standard basic link model, cancelled in cabling standard USES the star topology structure, the requirements of the wiring distance is: the permanent link length should not exceed 90 m, channel length should not exceed 100 m.
Currently, TWISTED PAIR can be divided into the unshielded TWISTED PAIR (UTP = UNSHILDED TWISTED PAIR) and shielding twisted-pair (STP = SHIELDED TWISTED PAIR). Shielded twisted-pair cable outer by aluminum foil bag, to reduce the radiation, but not completely eliminate the radiation, shielded twisted-pair cable prices are relatively high, it difficult to than unshielded twisted pair cable installation. Unshielded twisted pair cable has the following advantages:
(1) no shielding coat, small diameter, save the space occupied;
(2) light weight, flexible, easy installation;
(3) minimize crosstalk or eliminated them;
(4) has a flame retardant;
(5) has the independence and flexibility, is suitable for the structured cabling system.
In this two categories and 100 ohm cable, catamaran cable, multi-cores cable, 150 ohms shielded cable, etc