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How to contact current and Sonic together to achieve remote call has plagued people. ^ American Alexander Bell is destined to accomplish this historic task, he systematically studied the human voice, vocal and acoustic vibration mechanism principle in the design of hearing aids for the deaf in the process, he discovered that current conduction and stop moment, the spiral coil issued a noise, this finding makes Bell whim, with a current strength of the sound to simulate changes in the size, and thus with the current transmit sound. From this point onwards, Bell and his assistant Wo Sente began the difficult process of designing phones. June 2, 1875, the final design and 沃森特 Bell model and ongoing improvements to the moment of final testing, 沃森特 put his ear to the closed door of another room ready to answer on the speakers, Bell When the final operation accidentally spilled sulfuric acid in her lap, and he cried in pain, Mr. Wo Sente, come help me ah! 'Did not think that these words through his experiments telephone spread work in another room, Mr. 沃森特 ears. Very common phrase, then, became the first human to a speech delivered by telephone and remember people in history. June 2, 1875, but also by people as a great day to commemorate invented the telephone and charger recycling, but this place ^ Boston Court Road No. 109 and therefore the US manned annals charger recycling company, has its entrance still pinned bronze medals, engraved with the above: 'June 2, 1875 telephone born here. 'March 7, 1876, Bell invented the telephone to obtain patents, patent certificate number is 174655.1877 year millet phone charger recycling, namely Bell invented the telephone after the second year, in Boston and New York to set up the first telephone line open a, 300 km away from the two. Also in that year, it was the first phone to "Boston Globe" Send the news, from the beginning of the era of the public to use the phone. Within a year, Bell installed a total of 230 calls, the establishment of the Bell Telephone Company, which is the American Telephone and Telegraph Company, the predecessor for all types of twisted pair, distinguishing characteristics and evaluation include: wire diameter, copper content wire winding number per unit length, shielding measures. The combined effect of these factors determine the transmission rate and transmission distance twisted pair. ^) Wire diameter:! Ie copper wire diameter, generally the larger the diameter, the stronger the transmission capacity. Copper content: intuitive performance is softness wire, the more soft copper wire, the higher the amount, the transmission capacity of the stronger. Winding number of wire per unit length: indicates the closeness of helically wound wire, the winding number per unit length, the more offset by the stronger interference. Shielding measures: better screening measures, the stronger anti-interference ability. Can be divided into unshielded twisted pair UTP and shielded twisted-pair UTP according to whether or not a shield with metal seals: 3 D? > Sony mobile phone charger recycling, shown in Figure 1.2. Theoretically, shielded twisted-pair transmission performance is better, but in actual use, shielded twisted pair for installation are higher, and if grounded metal shield is not good, its performance under certain conditions even worse unshielded twisted pair. Thus, in fact widely used non-shielded twisted pair