US 20050030910A1
(19) United States
(12) Patent Application Publication (io) Pub. No.: US 2005/0030910 Al
Robertson et al. (43) Pub. Date: Feb. 10,2005
(54) FULL DUPLEX WIDEBAND
COMMUNICATIONS SYSTEM FOR A
LOCAL COAXIAL NETWORK
(76) Inventors: Neil C. Robertson, Lilburn, GA (US);
Jose M. Fernandez, Lilburn, GA (US)
Correspondence Address:
SCIENTIFIC-ATLANTA, INC.
INTELLECTUAL PROPERTY DEPARTMENT
5030 SUGARLOAF PARKWAY
LAWRENCEVILLE, GA 30044 (US)
(21) Appl. No.: 10/924,077
(22) Filed: Aug. 23, 2004
Related U.S. Application Data
(63) Continuation-in-part ol application No. 10/342,670, filed on Jan. 15, 2003.
Publication Classification
(51) Int. CI.7 H04B 1/56
(52) U.S. CI 370/276; 370/295; 375/222;
370/493
(57) ABSTRACT
Systems and methods are disclosed for a lull duplex wideband communications system for a local (e.g. in-home) coaxial network. The system employs a Frequency-division duplex (FDD) scheme that allows identical wideband modems to communicate with each other. To achieve this, the wideband modems contain a duplexer and a switch that allows reversing the connection of the wideband transmitter and receiver to the duplexer. Each wideband modem includes a control modem that is used to control access to the wideband channels. A wideband transmitter, which may be included in a modem associated with a server set-top terminal (STT), transmits a video presentation to a wideband receiver, which may be included in a modem associated with a client STT.
