초록 ▼

A method and system for multiple access telephone communications is described. The system utilizes one or more base units connected to subscriber lines, and multiple extension units in communication with each base unit via building power lines. Secure multiple access coding is used to prevent eavesd

A method and system for multiple access telephone communications is described. The system utilizes one or more base units connected to subscriber lines, and multiple extension units in communication with each base unit via building power lines. Secure multiple access coding is used to prevent eavesdropping and interference. Extension units may employ cordless telephone technology. Caller ID information transmitted with incoming telephone signals may be transmitted to extension units via building power lines and displayed on the extension handset or cradle.

대표청구항 ▼

[ What is claimed is:] [1.] A telephone communications system for transmitting and receiving telephone communications via AC power lines in a building, the system comprising:a) a base unit and an extension unit, each said unit comprising:i) off hook circuitry for detecting off hook status in the ext

[ What is claimed is:] [1.] A telephone communications system for transmitting and receiving telephone communications via AC power lines in a building, the system comprising:a) a base unit and an extension unit, each said unit comprising:i) off hook circuitry for detecting off hook status in the extension unit;ii) means for converting analog telephone communications signals to digital data signals;iii) means for generating a transmission carrier;iv) code division multiple access transmitter means for modulating said transmission carrier by said digital data signals;v) at least one additional multiple access means for further modulating and controlling transmission and reception of said modulated transmission carrier, said additional multiple access means being selected from the group consisting of:1) time division multiple access multiplexing means for controlling the times at which the digital data signals are transmitted and received;and2) frequency division multiple access means for changing said transmission carrier's frequency;vi) means for coupling said modulated transmission carrier to the power lines of the building;vii) code division multiple access receiving means for demodulating said modulated transmission carrier received via said power lines to produce analog telephone communications signals;b) means for coupling at least one subscriber telephone line to said base unit;c) ring detect circuitry associated with said base unit for detecting a ring signals in said subscriber line and transmitting a ring signal via said power lines in said building to the extension unit;d) ring generator circuitry associated with said extension unit for detecting a ring signal transmitted via said power lines and generating a ring signal in said extension unit;e) caller identification detect circuitry associated with said base unit for detecting caller identification signals transmitted with said ring signal and transmitting a caller identification signal via said power lines in said building to said extension unit;f) caller identification circuitry associated with said extension unit for detecting said caller identification signal transmitted via said power lines; andg) a display device on said extension unit on which caller identification information is presented to the telephone subscriber.