Method and apparatus for coupling an atm communication layer...

H - Electricity – 04 – Q

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H04Q 11/04 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2327484

A method for coupling an ATM communication layer to a plurality of N mutually time-independent time-division multiplex communication terminals having an overall payload cell rate CR N comprises the steps: generating a control signal sequence with a clock rate corresponding to the overall payload cell rate CR N of the N time-division multiplex communication terminals, whereby the control signals can represent a first or a second status; offering a fixed data pattern; transmitting the ATM cells coming from the ATM communication layer into an ATM cell waiting list; transmitting, on demand, an ATM cell from the ATM waiting list to the requesting time-division multiplex communication terminal when the respectively oldest control signal of the control signal sequence represents the first status, and transmitting the fixed data pattern to the requesting time-division multiplex communication terminal when the oldest control signal of the control signal sequence represents the second status; and deleting the oldest control signal of the control signal sequence. The method enables a frictionless coupling of an ATM communication layer having a plurality of mutually independent time-division multiplex communication terminals, whereby variable data rates (burst behavior) of the ATM layer as well as of the time-division multiplex communication terminals can be decoupled from one another and good cell display variation (CDV) properties can be assured. Figure 1

L'invention concerne un procédé pour le couplage d'une couche de communication MTA à N connexions de communication à multiplexage dans le temps, indépendantes les unes des autres dans le temps et ayant un taux de cellules utiles total CRN. Le procédé selon l'invention comporte les étapes suivantes: génération d'une séquence de signaux de commande à une cadence correspondant au taux de cellules utiles total CRN des N connexions de communication à multiplexage dans le temps, les signaux de commande pouvant représenter un premier ou un deuxième état; mise à disposition d'un schéma de données fixe; transfert des cellules MTA provenant de la couche de communication MTA dans une file d'attente de cellules MTA; s'il y a demande, transmission d'une cellule MTA de la file d'attente MTA à la connexion de communication à multiplexage dans le temps demandeuse lorsque le signal de commande le plus ancien de la séquence de signaux de commande représente le premier état et transmission du schéma de données fixe à la connexion de communication à multiplexage dans le temps demandeuse lorsque le signal de commande le plus ancien de la séquence de signaux de commande représente le deuxième état; enfin, suppression du signal de commande le plus ancien de la séquence de signaux de commande.

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