Switchable multi-drop video distribution system

H - Electricity – 04 – J

Patent

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Details

H04J 14/08 (2006.01) H04B 10/20 (2006.01) H04J 3/16 (2006.01) H04N 7/10 (2006.01) H04N 7/14 (2006.01) H04N 7/18 (2006.01) H04N 7/22 (2006.01) H04Q 11/00 (2006.01)

Patent

CA 2250438

A technique for controlling node equipment in a SONET ring transmission system. Control signals from a control center are transmitted in a selected byte of the SONET frame to each node (50-57) coupled to the SONET ring (24). Each SONET node includes a decoder (61) for decoding the control signals as to a destination address, and if a match is found, the node decodes a command field to carry out the representative functions. The command may be to activate or deactivate node circuits, or to receive or transmit video signals in specified VT channels of the SONET frame. In this manner, equipment can be switched on or off at the respective node to thereby optimize the bandwidth efficiency of the SONET network.

L'invention porte sur une technique de commande des équipements des noeuds d'un système de transmission en anneau du type réseau optique synchrone (SONET). Des signaux de commande provenant d'un centre de commande sont transmis, dans un octet sélectionné de la trame SONET, vers chacun des noeuds (50-57) raccordés à l'anneau SONET (24). Chacun des noeuds du réseau SONNET comporte un décodeur (61) de signaux de commande pour ce qui concerne l'adresse de destination, et si l'élément correspondant est trouvé, le noeud décode un champ d'instructions pour exécuter les fonctions représentatives. L'instruction peut être d'activer ou de désactiver les circuits du noeud, ou de recevoir ou d'émettre des signaux vidéo sur des canaux de transmission vidéo donnés de la trame SONET. On peut ainsi connecter ou déconnecter les équipements des différents noeuds de manière à optimiser l'utilisation de la bande passante du réseau SONNET.

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