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system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system..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 system. Obsolete computer system that may still be in use because its data cannot be changed to newer or standard formats, or its application programs cannot be upgraded. Use 'legacy system' in a Sentence. The legacy system has not been entirely phased out as it serves as a nice back up to our current system. 17 people found this helpful. I was really surprised to see the legacy system in action, because it was really cool and unique and something I had never seen.