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AssigneeConexant Systems, Inc.
InventorsKenneth D. Ko, David O. Anderton, Ismail I. Eldumiati, Steven A. Gronemeyer, Don L. Harmer, P. Michael Henderson, Joel D. Peshkin, Raphael Rahamim, Frederic M. Stubbe, John S. Walley, Kenneth S. Walley, Yongbing Wan, Edward S. Zuranski, Jamal Haque, Anthony A. Tzouris, Shrenik P. Patravali, Ganning Yang
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A digital subscriber line (DSL) communication system that utilizes the high frequency band of a standard telephone line does not require the use of a plain old telephone service (POTS) splitter in the resident's home, which provided isolation between the POTS frequency band (0 to 4 kHz) and the DSL frequency band. A digital subscriber line modem utilizes either constant envelope modulation or quadrature amplitude modulation for outputting DSL signals upstream to a central office. When a telephone in the resident's home is detected as being off-hook, then the constant envelope modulation is used by the DSL modem in order to lessen the intermodulation product distortion that results in audible noise heard by a user of the telephone. When the telephone is on-hook, then another type of modulation, such as QAM, is used to maximize the upstream data rate capability in the DSL frequency band, since any noise generated by the QAM is not a problem due to the non-use of the POTS frequency band.
A digital subscriber line communication system adapted to be coupled directly to a subscriber line, the system being capable of allowing simultaneous access to the subscriber line by a telephone equipment transmitting telephone systems in a first frequency band, and by a DSL modem transmitting DSL signals in a second frequency band higher than the first frequency band, the system comprising:
A modem coupled directly to a subscriber line without a splitter between the modem and the subscriber line, the subscriber line providing a first communication path for equipment in a first frequency band, the subscriber line providing a second communication path for the modem in a second frequency band higher than the first frequency band, the modem comprising:
A method of providing communications over a subscriber line connecting a central office to a remote location, the remote location including a first equipment operating in a first frequency band of the subscriber line, and second equipment operating in a second frequency band of the subscriber line, the second frequency band being higher than and not overlapping with the first frequency band, the method comprising the steps of:
A DSL modem for transmitting modulated signals on a subscriber line, the subscriber line being coupled to at least one telephone device, the DSL modem comprising:
Dependencies are inferred from the claim text.