HTI+ Residential Systems objective 1.7 states that the test taker should have knowledge of externally provided data services. These services include
Digital Subscriber Line (DSL) is a high-speed Internet access service that uses the existing telephone lines between the subscriber location and the local office to deliver Internet access transmission rates considerably faster than analog dial-up 56Kbps modems. Many types of xDSL service exist and are based on numerous standards, proprietary versions, different bandwidths, and various upstream and downstream transmission speeds. The number of DSL variations and service brand names has expanded because of the standards ...