Traditional systems (often found as Legacy systems) are 'passive', in that they provide excellent functionality when specifically asked to do something - they will answer enquiries, process updates and produce reports.
Hardware that is compatible may not always run at its highest stated performance, but it can nevertheless work with legacy components.
As TDD's are increasingly considered legacy devices, with the emergence of modern technologies such as email, texting and instant messaging, text from TDD are increasingly being sent over Text over IP gateways, or other real-time text protocols.
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VHF omnidirectional range(VOR) is an example of a legacy system to determine relative location.