A boat Electronics a boat cable a boat cable prices a boat cable sold a boat cable wholesale a boat cable quotes a boat cable production of a boat cable supply a boat cable manufacturers a boat cable manufacturers a boat cable proxy a boat rack a boat rack price a boat rack cabinets wholesale sales a boat a boat rack cabinets offer a production boat, a boat rack cabinet manufacturers supply a boat a boat a boat rack cabinet manufacturers agent a boat fiber fiber sales price of a boat a boat a boat wholesale fiber optic fiber offer a optical fiber manufacturing a fiber boat boat manufacturers supply a fiber boat a boat a boat manufacturer of fiber optic fiber cable into the agent a boat: UTP three two pairs of unshielded cables, UTP five four pairs of unshielded cables, UTP ultra-five four unshielded cable (single strand), UTP four pairs shielded cable (single strand), UTP six four pairs of unshielded cables (single strand), six four pairs of shielded cable (single strand), 6A class four pairs of shielded cable (single-stranded) twisted-pair wire common are three categories, Category 5 and Category 5 cable, and the latest Category 6 cable, the former and the latter diameter thin diameter thick, models are as follows: 1) a class line: Mainly used for the transmission of voice (a class standard is mainly used for the early eighties before the telephone wire), different from the data transfer. 2) Type II line: transmission frequency 1MHZ, for voice transmission and a maximum transfer rate of data transmission of 4Mbps, common in the use of token-passing protocol specification 4MBPS old Token Ring. 3) three lines: that is currently specified in the ANSI and EIA / TIA568 standard cable, the cable transmission frequency 16MHz, for voice transmission and a maximum transfer rate of 10Mbps data transmission is mainly used for 10BASE - T. 4) four lines: transmission frequency of such cables is 20MHz, for voice transmission and a maximum transfer rate of 16Mbps data transfer is mainly used for token-based LAN and 10BASE-T / 100BASE-T. 5) five lines: these cables increase the winding density, a high quality insulation jacket, transfer rate of 100MHz, for voice transmission and a maximum transfer rate of 10Mbps data transmission, mainly for 100BASE-T and 10BASE-T network. This is the most commonly used Ethernet cables. 6) over five lines: Ultra-5 class with low attenuation, less crosstalk, and has a ratio higher attenuation and crosstalk (ACR) and SNR (Structural Return Loss), a smaller delay error, performance has been very large increase. Category 5 cable is mainly used for Gigabit Ethernet (1000Mbps). 7) six lines: transmission frequency of such cables is 1MHz ~ 250MHz, 200MHz six cabling system when integrated attenuation crosstalk ratio (PS-ACR) should have a larger margin, which provides two times over five bandwidth. Transmission performance over six cabling much higher than five standard, ideal for the transmission rate is higher than the application of 1Gbps. Six with over five an important difference is: improved performance in terms of crosstalk and return loss, for a new generation of high-speed full-duplex network applications, excellent return loss performance is extremely important. Cancel six standard basic link model, cabling standards using a star topology, the required wiring distance: permanent link length should not exceed 90m, the channel length should not exceed 100m. 9) over six lines: Line is an improved version of the super-six six-line, is also a non-shielded twisted-pair cable ANSI / EIA / 6 class TIA-568B.2 and ISO / E level specified in the standard, Mainly used in gigabit networks. In the transmission frequency of the six lines, just as 200 ~ 250 MHz, the maximum transmission speed of up to 1 000 Mbps, but has greatly improved crosstalk, attenuation and signal to noise ratio and so on. 8) seven categories Line: This line is a class ISO 7 / F-class standards in the latest of a twisted pair, it is mainly in order to adapt to the application and development of Gigabit Ethernet technology. But it is no longer an unshielded twisted pair, but rather a shielded twisted pair, so it's up to the transmission frequency of at least 500 MHz, is more than twice the six lines and ultra-six lines, the transmission rate up to 10 Gbps. Currently, twisted-pair unshielded twisted pair can be divided into (UTP = UNSHILDED TWISTED PAIR) and shielded twisted pair (STP = SHIELDED TWISTED PAIR). Shielded twisted-pair cable outer layer aluminum foil wrapped to reduce radiation, but does not completely eliminate the radiation, shielded twisted pair relatively high prices, unshielded twisted pair cable difficult than during installation.