公开(公告)号：JP2001069102A

公开(公告)日：2001-03-16

申请号：JP2000217060

申请日：2000-07-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BLAHUT DONALD EDGAR ,  MAGILL PETER D

IPC: H04J3/00 ,  H04J3/06 ,  H04L7/06 ,  H04N7/173 ,  H04N7/22 ,  H04L12/46

Abstract: PROBLEM TO BE SOLVED: To provide communication equipment for time division multiple access(TDMA) without the loss of a transmission band caused by in-band raising. SOLUTION: A communication network 100 has a video server 101 for supplying a down video signal to a wide area communication network 102 and responds to up communication including a selection message. The wide band communication network 102 supplies the communication signal to an optical transmission line terminal 103 and the communication signal is supplied from the optical transmission line terminal 103. When the power source of client equipment for transmitting the TDMA signal is turned on or transmission is performed corresponding to a specified command generated locally or remotely, an out-band tone is transmitted and when the equipment is arranged and the power source is recovered again after a power failure or temporary interruption or when the equipment is connected again after disconnection at the time of verifying the equipment, the equipment is initialized.

公开(公告)号：CA2291917A1

公开(公告)日：2000-06-16

申请号：CA2291917

申请日：1999-12-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SWAMINATHAN VENKATARAMAN ,  MAGILL PETER D ,  CHAND NARESH ,  DAUGHERTY THOMAS HENRY

IPC: H04B10/50 ,  H04B10/516 ,  H04B10/556 ,  H04J1/00 ,  H04J14/02 ,  H04L27/18 ,  H04N7/22 ,  H04B10/20

Abstract: This invention is a new communication system in which multichannel broadcast digital services are distributed to each user with the broadcast video signal riding in the passband above a digital baseband signal. The system can deliver more than 1 Gbps additional bandwidth to each subscriber. The passband bandwidth will accommodate growth in downstream services including video on demand, higher speed web downloads including improved streaming audio and video, HDTV, interactive video, and personalized video. The invention requires only a single transmitter, a single transmission fiber and a single receiver for each user. A single transmitter, single fiber, single receiver system is much less expensive than two systems, one transmitting baseband and the other passband. A single receiver is greatly cost beneficial to achieving an economical fiber to the home solution where equipment at the end user location is not shared among multiple end users. In an exemplary embodiment, an optical communication system comprises a diplexer for electronically combining the baseband and passband signals, a digital laser transmitter for generating an optical signal containing the combined signals, a length of optical transmission fiber for transmitting the optical signal, and, for each user or group of users, an optical receiver coupled to the fiber.