Asymmetric flow of information is the key feature of the ADSL (Asymmetric Digital Subscriber Loop) technology, i.e. higher data transmission rate towards the user than from the user towards the network. Characteristic is the short message sending by the user with a certain request to the se!Ver. The se!Ver responds to the request by a significantly longer message of various electronic forms (data, digitized speech, pictures or video). Therefore, this technology is most often used by small and medium users. ADSL is currently the only commercially available DSL technology which is still experiencing the break- through on the seiVice market. It enables faster access to the Internet, LAN (Local Area Network), videoconferencing, VoD (Video on Demand) and interactive multimedia. In order to standardize such se/Vices, the !TU (International Telecommu- nications Union) G. 992.1 (standardized DMT- discrete multi--tone line coding technology) and ANSJ (American National Standards Institution) Tl.413-95!98 are used for ADSL. DMT (Discrete Multi Tone), as the more popular one, uses the line coding technique, which splits a certain frequency range into several sub-channels. Most of these sub- channels are used for upstream and downstream transmission of speech and data, whereas some are used as pilot signals or kept in rese/Ve. Such modulation technique expands the frequency spectrum, allow-ing the usage ofbroadband se/Vices per one pair ofwires. In this way the sharing of speech and data se/Vice transmission is real-ized.
asymmetric transmission, distance of the user, broadband ac-cess network, standardization, modulation techniques, voice and data se/Vices
Nikhilesh Sharma "Digital Subscriber Line" Iconic Research And Engineering Journals Volume 1 Issue 10 2018 Page 190-194
Nikhilesh Sharma "Digital Subscriber Line" Iconic Research And Engineering Journals, 1(10)