This paper describes the work at BT Laboratories on set-top boxes (STB
s), for the BT interactive multimedia services (IMS) trials. An overvi
ew of the trial STB's architecture is described together with a predic
tion of the future STB architecture following the evolution of standar
ds. The most likely topologies for networks within the home are discus
sed, and finally a prediction of the functionality for STBs in the fut
ure is made.