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system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system..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.
Despite the availability of more cost-effective technology, about 80% of IT systems are running on legacy platforms. International Data Corp. estimates that 200 billion lines of legacy code are still in use today on more than 10,000 large mainframe sites.