A demarc extension is the process of connecting your organizationâs network to a data lineâsuch as a T1, DSL, or POTSâprovided by the telephone company or another vendor.
Legacy system. In computing, a legacy system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system.. Often a pejorative term, referencing a system as legacy means that it paved the way for the standards that would follow it.
Legacy server operating systems from suppliers such as Hewlett-Packard, IBM, Microsoft, Tandem and Unisys still power important applications in banking, travel and the public sector. Many banks rely on core systems built in the late 1970s and early 1980s.