At the simplest level, the interconnection needed is to the telephone network and the in-house telephone wiring with its connected devic for telephony, and computer data, etc. In this basic case the RG provides a pass-through function.
A next stage of complexity may be to add the ubiquitous TV. The RG must accommodate whatever type of external network that serv the NTSC TV signal. This stage may represent the typical level of home complexity with telephone service, along with two to three televisions served either from a CATV network or from an antenna. In some cases this may be as simple as providing the pass-through capability of the CATV (or of a 300 ohm, balanced antenna lead), a well as of the telephone signals. At this stage, the RG is providing very limited functionality, primarily being a point of interconnection for pass-through.
Second Source Television Network
If now we add a DBS TV network connection (or other potential future video sources), then the complexity increases. The complexi comes from the desire to be able to choose between video sources a each TV. This could be accommodated by providing:
Separate physical paths (separate in-house networks) to each TV and allowing for a switching function (between the networks) at the TVs. This would require separate, but very simple, interface cards for each in-house video network.
A tuning capability at the RG for each video network and a separate modulated signal for each network (e.g., channel 3 for DBS, and channel 4 for CATV). This would require much more complex (expensive) video modules, but it would add a great de