Combined terminal adapter for smd5 and frame relay high...

H - Electricity – 04 – J

Patent

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Details

H04J 3/22 (2006.01) H04J 3/26 (2006.01) H04L 12/28 (2006.01) H04L 12/56 (2006.01) H04L 29/06 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2091084

A terminal adapter interfaces between a Data Terminating Equipment (DTE) and either a Frame Relay (FR) or a Switched Multimegabit Data Service (SMDS) telecommunications network so that the type of network over which the DTE is communicating is transparent to the DTE. The TA performs mapping from one protocol to another so that a native FR DTE can access an SMDS network and so that a native SMDS DTE can access a FR network. The address mapping method performed by the TA uses a parallel table look-up technique which reduces the chance of collision (when two or more addresses hash into the same table entry), eliminates the traditional comparison function to detect a collision, and eliminates the traditional pointer technique when a collision occurs.

L'invention est un adaptateur de terminal utilisé comme interface entre un équipement terminal de traitement de données (ETTD) et un réseau de teélécommunication à relais de trames (RT) ou à SMDS («Switched Multimegabit Data Service») pour rendre transparent à l'ETTD le type du réseau sur lequel il est en communication. L'adaptateur de l'invention effectue une mise en correspondance d'un protocole à un autre de façon qu'un ETTD à RT puisse avoir accès à un réseau à SMDS et qu'un ETTD à SMDS puisse avoir accès à un réseau à RT. La méthode de mise en correspondance des adresses utilisée par l'adaptateur a recours à une technique de consultation de tables parallèles qui réduit la probabilité de collision (deux adresses ou plus dans un même entrée de la table), élimine la fonction de comparaison usuelle servant à détecter les collisions et élimine l'opération de pointage usuelle en cas de collision.

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