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A remote level adjustment system for use in a multi-terminal communications system wherein a plurality of remote terminals are connected to a master terminal by a distribution network for bi-directional transmission of signals. The remote terminals are adapted to transmit and receive signals on the

A remote level adjustment system for use in a multi-terminal communications system wherein a plurality of remote terminals are connected to a master terminal by a distribution network for bi-directional transmission of signals. The remote terminals are adapted to transmit and receive signals on the network and respond to a polling signal by transmitting signals regarding transactions at respective sites. Each remote terminal includes circuitry for responding to level-setting signals by transmitting reply signals, and variable attenuation circuitry for adjusting, in response to a level-setting adjustment signal, the power level of the signals it transmits. The master terminal is adapted to transmit and receive signals on the network and includes program and circuit means for transmitting a polling signal. The master terminal further includes program and circuit means for transmitting level-setting signals, for measuring the power level of reply signals from selected remote terminals and deciding whether to adjust the level, and for transmitting a level-setting adjustment signal, if necessary, to command the selected remote terminal to adjust the setting of its variable attenuation circuitry in accordance with a level-setting protocol.

대표청구항 ▼

A method for remote level adjustment in a communications system in which a plurality of remote terminals are connected to a master terminal by a communications network for bi-directional transmission of signals between said master terminal and said remote terminals, the method comprising the steps o

A method for remote level adjustment in a communications system in which a plurality of remote terminals are connected to a master terminal by a communications network for bi-directional transmission of signals between said master terminal and said remote terminals, the method comprising the steps of: (a) transmitting a polling signal from said master terminal for causing said remote terminals to transmit output signals carrying data regarding transactions at respective remote locations; (b) interrupting said polling signal and transmitting an interrogation signal from said master terminal for causing a selected remote terminal to transmit a reply signal; (c) resuming said polling signal while measuring at said master terminal the level of said reply signal transmitted by said selected terminal; and (d) temporarily interrupting said polling signal, if desirable based on said measurement, to transmit an adjustment signal from said master terminal for causing said selected remote terminal to adjust its output signal level according to a predetermined protocol.