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1. WO1996041452 - REVERSE PATH ALLOCATION AND CONTENTION RESOLUTION SCHEME FOR A BROADBAND COMMUNICATIONS SYSTEM

Publication Number WO/1996/041452
Publication Date 19.12.1996
International Application No. PCT/US1996/009210
International Filing Date 06.06.1996
Chapter 2 Demand Filed 31.12.1996
IPC
H04L 12/28 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12Data switching networks
28characterised by path configuration, e.g. LAN or WAN
H04L 27/20 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
18Phase-modulated carrier systems, i.e. using phase-shift keying
20Modulator circuits; Transmitter circuits
H04L 27/22 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
18Phase-modulated carrier systems, i.e. using phase-shift keying
22Demodulator circuits; Receiver circuits
H04M 11/06 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
11Telephonic communication systems specially adapted for combination with other electrical systems
06Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
H04M 3/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
H04M 7/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
7Arrangements for interconnection between switching centres
CPC
H04H 20/78
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
HBROADCAST COMMUNICATION
20Arrangements for broadcast or for distribution combined with broadcast
65Arrangements characterised by transmission systems for broadcast
76Wired systems
77using carrier waves
78CATV [Community Antenna Television] systems
H04H 20/79
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
HBROADCAST COMMUNICATION
20Arrangements for broadcast or for distribution combined with broadcast
65Arrangements characterised by transmission systems for broadcast
76Wired systems
77using carrier waves
78CATV [Community Antenna Television] systems
79using downlink of the CATV systems, e.g. audio broadcast via CATV network
H04H 20/81
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
HBROADCAST COMMUNICATION
20Arrangements for broadcast or for distribution combined with broadcast
65Arrangements characterised by transmission systems for broadcast
76Wired systems
77using carrier waves
81combined with telephone network over which the broadcast is continuously available
H04H 60/94
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
HBROADCAST COMMUNICATION
60Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
76Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
81characterised by the transmission system itself
93Wired transmission systems
94Telephonic networks
H04H 60/97
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
HBROADCAST COMMUNICATION
60Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
76Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
81characterised by the transmission system itself
93Wired transmission systems
96CATV systems
97using uplink of the CATV systems
H04J 1/12
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
1Frequency-division multiplex systems
02Details
12Arrangements for reducing cross-talk between channels
Applicants
  • SCIENTIFIC-ATLANTA, INC. [US]/[US]
Inventors
  • DUBBERLY, Gregory, Thomas
  • BOHANNON, Thomas, Autrey
Agents
  • HARRIS, John, R.
Priority Data
08/475,22007.06.1995US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) REVERSE PATH ALLOCATION AND CONTENTION RESOLUTION SCHEME FOR A BROADBAND COMMUNICATIONS SYSTEM
(FR) PLAN D'AFFECTATION DE VOIE RETOUR ET DE RESOLUTION DE CONFLIT POUR UN SYSTEME DE COMMUNICATION A BANDE LARGE
Abstract
(EN)
A broadband communications system for coupling telephony or other digital networks to a CATV network. The system transmits a multiplex of telephony signals in the forward band of the CATV network. The forward telephony channels are demodulated and demultiplexed by a plurality of subscriber terminals into the individual telephony signals directed to an addressed subscriber. Signals returning from subscribers are digitized into standard telephony signals onto the reverse band of the CATV network, and demodulated and multiplexed into a standard telephony signal that is interfaced to the telephony network. A multiplicity of subscribers are initially assigned to a selected reverse band channel. If more than one subscriber contends for use of the reverse channel by transmitting in the channel, signals from the contending subscribers interfere and prevent any subscriber's identity from being decoded and acknowledged. The contending subscribers wait for a random wait time and re-attempt to transmit. Upon transmission re-attempt, one of the subscribers (typically the one with the shortest wait time) will successfully gain access to the reverse channel, and the other subscribers are assigned to a different reverse channel.
(FR)
Cette invention se rapporte à un système de communication à bande large pour le couplage de réseaux de téléphonie ou d'autres réseaux numériques à un réseau de télévision par câble. Ce système transmet un multiplex de signaux de téléphonie dans la bande aller du réseau de télévision par câble. Les canaux de téléphonie aller sont démodulés et démultiplexés par une pluralité de terminaux d'abonnés en signaux de téléphonie individuels dirigés vers un abonné adressé. Les signaux revenant des abonnés sont numérisés en signaux de téléphonie standard sur la bande retour du réseau de télévision par câble et ils sont démodulés et multiplexés en un signal de téléphonie standard qui est interfacé au réseau de téléphonie. Plusieurs abonnés sont initialement affectés à un canal de bande retour sélectionné. Si plus d'un abonné entre en conflit pour l'utilisation du canal retour en émettant dans ce canal, les signaux provenant des abonnés en conflit interfèrent et empêchent toute identité d'abonné d'être décodée et reconnue. Les abonnés en conflit doivent patienter pendant une période d'attente aléatoire et procéder à une nouvelle tentative de transmission. Lors de cette nouvelle tentative de transmission, l'un des abonnés (généralement celui ayant le temps d'attente le plus court) obtient l'accès au canal retour et les autres abonnés sont affectés à un canal retour différent.
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