The ideal time to install this infrastructure is during the initial build or any significant remodel. It can be done in existing homes but other technologies may be a better solution (i.e. Wireless networking).
Structured wiring should be incorporated into every new home according to the standards adopted by the FCC in 1999. So, what is it? Very simply, it is the type of wire and the method of installation used to ensure interference free phone and data lines for not only today's transmission speeds but for future speeds as well.
Additional enhancements such as security, lighting controls, home management, and audio/video distribution should also follow these guidelines. With the proper design and wiring, your home will be ready for what you want now and future enhancements that you can add at your own pace and budget.