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system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system..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.
An outdated device that a person or company has invested money in or is seen as an essential part of their system. Usually the term legacy device is used when referring to any device that is not Plug-and-Play compatible (i.e. in reference to older ISA devices). PREVIOUS. legacy application.