symmetric sigital subscriber line
automatic subscriber line testing equipment
ISDN digital subscriber line ISDN
very-high-data-rate digital subscriber line
VDSL (very-high-data-rate digital subscriber line)
Asymmetric digital subscriber line (ADSL) is a technology that provides broadband service for users on the existing twisted pair line.
The third is the ability of the network to provide a variety of data communications services over a single digital subscriber line.
The article discussed how to upgrade the communication networks of CATV system and telephone system to support multimedia information service system, and introduced hybrid fiber coax and asymmetric digital subscriber line access technology.
