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system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system..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.
Additional uses of the term Legacy in computing[edit] The term legacy support is often used in conjunction with legacy systems. The term may refer to a feature of modern software. For example, Operating systems with legacy support can detect and use older hardware.