网线分类（Network classification）.docVIP

网线分类（Network classification） There are two kinds of telephones: Analog phones (commonly used is this), digital phones Analog phone with two core line, digital telephone with four core line. Therefore, the phone line is generally four core lines, if your home phone is analog, that empty out of the two cents, you can not. Network cable is divided into several kinds. All develop according to the time. 1) a class of lines used primarily for transmitting voice (a standard used primarily for telephone cables before the beginning of the 80s), unlike data transmission. 2) two lines: data transmission frequency of 1MHZ, data transmission for voice transmission and maximum transmission rate 4Mbps, common in old token networks using 4MBPS specification token passing protocol. 3) three lines: refers to the current in the ANSI and EIA/TIA568 standards specified in the cable, the cable transmission frequency 16MHz, for voice transmission and the highest transmission rate of 10Mbps data transmission, mainly for 10BASE--T. 4) four lines: the transmission frequency of this kind of cable is 20MHz, the data transmission for voice transmission and the highest transmission rate 16Mbps is mainly used for token based LAN and 10BASE-T/100BASE-T. 5) five lines: the cable winding density increased, a coat of insulating materials of high quality, the transmission rate is 100MHz, the maximum transmission rate for voice transmission and data transmission for 100Mbps, mainly for the 100BASE-T and 10BASE-T network. This is the most commonly used Ethernet cable. 6) over five lines: Ultra 5, with small attenuation, less crosstalk, and higher attenuation and crosstalk ratio (ACR) and Loss Return (Structural), smaller delay error, performance has been greatly improved. Over 5 lines are mainly used for Gigabit Ethernet (1000Mbps). 7) six lines: the transmission frequency of this kind of cable is 1MHz to 250MHz, and the six kinds of cabling system have integrated attenuation in 200MHz. The crosstalk ra