In the modern organization as a workplace, and in many cases, leisure after work, have virtually become an integral part of the means of information transfer. Yes and no denying the fact that the possession of the necessary knowledge in our time is similar to the physical possibility of movement of a living organism. Suggestive phrase "movement is life" can be supplemented with "a life - is information." It was in this environment, information is the dependence modern man. To solve the questions of the organization fast, reliable connection from the beginning of the last century using wired channels. It is this method still remains the most functional and reliable quality, and digital modems are now made inexpensively by using already available in almost any terrain two-wire communication lines, to organize a point of access to corporate channels or the Internet, without depriving the consumer is already installed on this line analog telephone.
The most promising technology currently has ADSL, to turn the twisted pair telephone wires in a tract of high-speed data transmission. ADSL line connects two modem ADSL, which are connected to each end of the phone cable. The main constituents of the organization ADSL - connections are the DSLAM (the device on the provider), ADSL-modem (the device on the user side), or twisted-pair telephone cable. In this case, organized three information channels - outgoing digital data from the user of incoming digital data and channel the regular telephone line (POTS). Telephone channel is allocated using filters, which guarantees the performance of your phone, even in an emergency connection ADSL. In data transmission technology is asymmetric - the speed of incoming flow, etc. data that is transmitted in the direction of the end user is higher than the rate of outgoing flow, ie transmitted from the user towards the network. But at the same time, the speed of data transmission from the user is still significantly higher than when using an analog modem. In fact, it is much higher than in the channels of ISDN (Integrated Services Digital Network - Digital Network Integrated Services).