•Digital Subscriber Line (DSL): higher grade of service offered by some telephone companies.
•Integrated Services Digital Network (ISDN): first technology developed using a DSL protocol; offers bandwidths up to 256 Kbps.
•Asymmetric Digital Subscriber Line (ADSL): offers transmission speeds ranging from 16 Kbps to 9 Mbps.
•T1 or T3 connections: often used by businesses and large organizations; much more expensive than POTS or ISDN connections.