Maximum speed is determined by the type of modem attached to the line. Most analog modems now are 56 Kbps, the highest speed possible on a normal dial-up line, although the actual transmission speeds usually are lower. Cable Cable modems on average have a bandwidth of 1.544 Mbps. Fiber-optic cable connects the transmission center to local coaxial cable lines. Fiber-optic cabling takes up little conduit space and offers high security with high bandwidth.
Cable also provides always-on availability.
DSL DSL is a term for any local digital network loop. In simple terms, DSL is an improved method for moving data over regular telephone lines. A DSL circuit, however, is much faster than a normal phone connection and, like cable, is always available. The circuits are configured to connect to two specific locations, similar to a leased line, allowing for download speeds of up to 1.544 Mbps. DSL is a popular alternative to ISDN and traditional leased lines because it is faster, less expensive and provides a dedicated line as well as unlimited usage for a monthly fee.