It is used primarily for subscriber line signaling. Broadband internet is available to customers in Pahiatua using digital subscriber line technology. IP-DSLAM stands for "Internet Protocol Digital Subscriber Line Access Multiplexer". An aborted call is made to the subscriber line. As the cost of subscriber line carrier declined, party lines were gradually phased out. AT&T. It is the fifth largest telephone provider based upon residential subscriber line count. ADSL differs from the less common symmetric digital subscriber line (SDSL). In terms of technology, KT primarily uses Digital Subscriber Line (DSL). Modems are commonly used for telephone lines, using a digital subscriber line technology. The majority of connections are digital subscriber line over phone lines. Only one DSL modem can use the subscriber line at a time. Digital subscriber line (DSL) is the main broadband telecom technology. Digital subscriber line (DSL) service provides a connection to the Internet through the telephone network. DSL device to the digital subscriber line access multiplexer (DSLAM) when a power outage occurs. In symmetric digital subscriber line (SDSL) services, the downstream and upstream data rates are equal.