Legacy Network

The term used to describe a network based on older, outdated protocols. For example, any network not based on the IP (TCP/IP) protocol. In a broader sense, as technologies advance, assets that do not support the services and capabilites enabled by the newer generation equipment and architectures are deemed to be legacy. It should be noted that legacy assests tend to stick around (provided they still work) as their maturity allows for stable work-flows and well-defined operations.