Abstract: Automatic gain control (AGC) may be accomplished in a radio frequency (RF) amplifier in a hybrid fiber-coaxial (HFC) network using a wideband RF tuner to select multiple pilot channels (e.g., frequencies in lower and upper portions of an RF signals spectrum) for use in measuring power and determining a correction to be applied to the RF amplifier. The power of the pilot channel or channels may be measured, for example, using a received signal strength indicator (RSSI) from the wideband RF tuner or using a power detector circuit. Using the wideband RF tuner allows selectable gain and/or tilt control across a wideband spectrum, such as a channel spectrum of a CATV downstream RF signal, to maintain stable RF output levels of the amplifier as RF input levels vary. The RF amplifier may be a line extender amplifier used in a CATV HFC network to amplify a wideband RF spectrum of up to 1.8 GHz.

Abstract: A digital repeater for use in a tree and branch communication network is disclosed. The digital repeater has first path for downstream data communications. The first path does not perform Viterbi decoding in order to minimize the delay for downstream communications. A second path with a Viterbi decoder is used to detect communications addressed to the digital repeater. The disclosure includes other related material including teachings on the integration of the digital repeater into a network including modifications to polling, discovery, and automatic gain control procedures.