Method and apparatus for allowing communication in an isochronou

Details Method and apparatus for allowing communication in an isochronou Method and apparatus for allowing communication in an isochronou

1997-09-17

2000-08-15

Ton, Dang

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370358, H04L 1228, H04L 1256

Patent

active

061047147

ABSTRACT:
A method and apparatus for an isochronous traffic of Asynchronous Transfer Mode (ATM) cells in a ring network having at least two stations (101,102) and a ring server (001). The communication within the ring is based on specific isochronous control and data cells. The control cell contains a cell header, sequence number, type of command and parameter fields. The data cell contains a header and a payload divided into N m-bit slots. The isochronous data cells are shared by a plurality of stations on the ring by allocating corresponding slotlist whose identification is carried in the parameter field. Furthermore, the server provides for each station's communication link a transmit identifier in the header associated to a reference in a list of allocated slots for transmission and a receive identifier associated to a reference in a list of allocated slots for reception. The implementation of two pairs of registers whose bits correspond to each byte of the isochronous data cell enables processing in real time transmission and reception of the isochronous data cells and to concatenate the bytes to be stored in a memory and to transmit transparently unmodified or substituted bytes on the ring.

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