Abstract: A set top box arrangement includes transmitting circuitry for transmitting a message and an emulated reply to the message, and receiver circuitry for receiving the control message and comparing the control message to the emulated reply to the message. The transmitted message and emulated reply message are each a digital satellite equipment control message. The emulated reply message that was received is compared with the reply that was transmitted to verify 22kHz tone operation of a low noise block downconverter power supply.

Abstract: An RF multiple switching apparatus, such as one included in or coupled to a broadcast satellite signal receiver, having a plurality of multiple RF signal input ports for receiving respective ones of a plurality of RF signals, such as broadcast satellite television signals, utilizes a relative signal strength indicator, such as an automatic gain control signal, to determine the difference between the actual input signal that is present at one of the plurality of signal input ports and a false signal that appears to be present at another signal input port of the plurality of signal input ports due to the RF signal bleeding between the multiple signal input ports. During a setup configuration determination or routine, the switching apparatus steps through each RF signal input, extracts pertinent transmission network (such as a satellite transmission network) information, determines a relative signal strength indicator for the RF signal, and compares the obtained information.