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system is an old method, technology, computer system, or application program, of, relating to, or being a previous or outdated computer system..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.
These may include various UNIX-based servers that run legacy versions of UNIX, from Solaris to AIX. Furthermore, you may run a legacy database, such as Sybase, Informix or Oracle, with applications written in C/C++, Java, PowerBuilder or a 4GL language.