Buffered repeater with early filling of transmit buffer

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01) H04L 12/46 (2006.01)

Patent

CA 2277097

A repeater which introduces a minimum of delay in the transfer of a data packet from a source LAN to a destination LAN has an arbiter which grants access to a bus for a port to broadcast a received data packet onto the bus for loading the data packet into a transmit buffer for each outgoing port. The arbiter grants access only after all ports signal that their transmit buffers are ready to load the data packet from the bus. A transmit buffer signals that it is ready to be loaded at the passage of the collision window as it is transmitting a packet previously loaded into the transmit buffer. Accordingly, the transmit buffer is simultaneously transmitting the previously loaded packet and loading the new packet after the arbiter responds to the signal.

Cette invention concerne un répéteur qui va n'entraîner qu'un retard minimal lors du transfert d'un paquet de données depuis un réseau local source vers un réseau local de destination. Ce répéteur comprend un arbitre qui va garantir l'accès d'un port à un bus, ceci afin de diffuser un paquet de données reçu sur le bus, et de charger le paquet de données dans un tampon émetteur pour chaque port sortant. Cet arbitre garantit l'accès uniquement lorsque tous les ports ont signalé que leurs tampons émetteurs sont prêts à charger le paquet de données provenant du bus. Un tampon émetteur signale qu'il est prêt à être chargé lorsque passe la fenêtre de collision et qu'il transmet un paquet préalablement chargé dans le tampon émetteur. Le tampon émetteur va ainsi simultanément transmettre le paquet préalablement chargé, et charger le nouveau paquet une fois que l'arbitre a répondu au signal.

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