TELECOMMUNICATION SYSTEM FOR PROVIDING SUBSCRIBER WITH BOTH OF NARROW BAND SERVICE AND WIDE BAND SERVICE, SUBSCRIBER EQUIPMENT, SHELF THEREFOR, EXCHANGEABLE LOW-PASS FILTER DEVICE, LINE TERMINATING EQUIPMENT AND NETWORK TERMINATION

摘要

PROBLEM TO BE SOLVED: To provide a subscriber with a wide band digital communication service by utilizing a telephone line. SOLUTION: This telecommunication system for providing both of a narrow band service and a wide band service in the sites of the plural subscribers is provided with at least one shelf for connecting a public exchange telephone network (PSTN) and an asynchronous transfer mode(ATM) network through corresponding plural twisted pair copper wires 36 to plural subscriber sites for connection to the PSTN and the connection to the ATM network and plural subscriber modems for the connection to the corresponding plural twisted pair copper wires 36. The respective twisted pair copper wires 36 provide asymmetrical digital subscriber lines so as to provide both of a conventional telephone service (POTS) and the digital channel of an ATM format.