H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/56 (2006.01) H04L 12/26 (2006.01)
Patent
CA 2162004
In digital transmission systems, adapted data units travel at a high throughput rate over large parts as a stream of fixed length data packets, called cells in this instance. The present method permits the measurement of characteristic magnitudes of the cell stream with respect to the respective individual connection to which they belong. It is based on storing from each arriving cell the identification data of the individual connection to which it is allocated, including its relative position in the cell stream. The memory is interrogated during a cell cycle time. A selection is made about which memory spaces within a defined area contain a predetermined identification data belonging to an individual connection. As a function of the selected memory spaces, the determined result, together with the magnitude and the position of the interrogated area, provides a decisive statement of the measured value. Several interrogations can take place within the same cell cycle time, and several measurement results can thereby be obtained. A preferred device for carrying out the method providesa shift register (15) as the memory, which stores the identification data (ai) at the clock rate of the arriving cells. In each cell cycle, a control circuit (16) determines which memory area must be interrogated about what data, which can take place in multiple form. It controls a selector (17), which tests the content of each shift register unit for coincidence with the specified identification data (ai), and establishes a signal bit (fi) if they coincide. An adder (19) calculates the sum m(aj) of all selected signal bits (fi).
Grunenfelder Reto
Stock Thomas
Alcatel N.v.
Robic
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