CATV-LAN system having simple modem configuration and providing

Telecommunications – Wireless distribution system

Patent

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455 51, 348 12, 348 6, H04N 100, H04N 714

Patent

active

057616035

ABSTRACT:
In a CATV-LAN in which a plurality of modems transmit messages asynchronously from respective terminal apparatuses to an upstream transmission path and receives messages from a downstream transmission path, when a modem is transmitting a message, the resultant data which are received by that modem are compared with data of that message which have already been transmitted, and transmission is interrupted if the received data do not correctly match the transmitted data, due to conflict with data transmitted by some other modem. Each message contains information specifying its length, and when a non-transmitting modem receives a set of data whose actual length does not match a length value which is specified within the data, the data are discarded. It thereby becomes unnecessary to provide beat detection circuits in the modems, for detecting data conflict, so that system cost can be reduced.

REFERENCES:
patent: 4792849 (1988-12-01), McCalley et al.
patent: 5446918 (1995-08-01), Lamy
patent: 5534913 (1996-07-01), Majeti
IEEE Transactions on Consumer Electronics, vol. 39, No. 4, 1 Nov. 1993, New York, NY, US, pp. 887-894, XP000423078, Tomohiro Hase: "Transmission for Digital Video Signals Coded by CCITT H.261 on a Private Broadband LAN Using Co-Axial Cable".
IBM Technical Disclosure Bulletin, vol. 35, No. 1B, 1 Jun. 1992, pp. 383-385, XP000309104, "Packet Networking Scheme for Radio Frequences".
"Data, Video Integrated Broadband LAN System" by Hirata et al. as a Technical Report IN88-4 No. 12, 1988, of the Electronic Data Communication Institute (Japan).

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