Patent ID: 6426819
Filing Date: 2002-07-30
Classification: H04B

Abstract:
An infrared receiver/transmitter (RT) module for use in a communication system using a time division multiple access communication protocol for enabling a central control unit connected to telephone lines to communicate with a plurality of portable infrared devices located within a building through a signal processing unit which produces a repetitive frame signal having time spaced transmission and receiving segments each of which includes a plurality of time spaced respective transmission and receiving slots, comprising:transmitter means for sending signals received from a base unit within transmission slots at an infrared carrier frequency to portable infrared devices and receiver means for sending signals received in the form of infrared signals from portable devices within receiving slots to the base unit; a signal generator to produce characteristic signals indicative of a quality of infrared signals occurring during respective receiving slots and incident at the RT module from infrared portable devices communicating during said respective receiving slots with the base unit.