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system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system..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Legacy implies that the system is out of date or in need of replacement, however it may be in good working order so the business or individual owner does not want to upgrade or update the equipment. Typically vendor or manufacturer support is not available for legacy systems and applications.