A service that provides access to a network.Access services include residential lines, business lines, and PBX trunks for access to the public switched telephone network (PSTN). Broadband access services include broadband over power line (BPL), digital subscriber line (DSL), cable modem service, and passive optical network (PON). See also BPL, cable modem, DSL, line, PON, PSTN, and trunk.