Satellite channel router

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A Satellite channel router (SCR) is a device that allows the distribution of DVB-S and DVB-S2 (satellite TV) signals to several users (4, 6 or more) using a single coaxial cable. It may be used to substitute a traditional multiswitch, that needs a dedicated coaxial cable for every set-top box (or tuner) connected.

[edit] Operations

The principle of working follows: each subscriber has a dedicated user band, whose bandwidth is approximately the same of a transponder. If a subscriber requires a particular transponder (eg. 1550MHz on vertical-low band), a mixer converts it to the correct user band center frequency. The converted transponders of various users are then combined, and downcasted towards the set-top boxes. Then, the signals are split again to reach every user, for example by using a power divider. The set-top box requests a channel via a DiSEqC-compliant command. Like a traditional multiswitch, a SCR needs to be fed with four cables carrying the four bands provided by a satellite. The SCR is useful if used with dual-tuner systems, as PVRs (Personal Video Recorders).

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