Method and device for evaluating the throughput of virtual circu

Details Method and device for evaluating the throughput of virtual circu Method and device for evaluating the throughput of virtual circu

1990-06-20

1992-08-11

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, H04J 116, H04J 314, H04J 324

Patent

active

051386070

ABSTRACT:
A memory location is assigned to each virtual circuit, this location containing a context (CT) that defines the evaluation conditions for measuring the throughput of the virtual circuit and then, upon reception of each cell, providing for the context relating to the virtual circuit to which the cell belongs to be read. A clock signal is adapted to supply a current time associated with this virtual circuit. An indication of the measuring interval start time is written into the context (CT) for a virtual circuit upon arrival of a first cell for this virtual circuit. Upon the arrival of a subsequent cell for this virtual circuit, the context is read and from the current time (hc) the time interval start time is subtracted. The time difference is compared to a specified measurement interval duration and the number of cells already received is incremented. This number of cells already received is used as a measurement of the mean throughput of the virtual circuit when the time difference is equal to or greater than the duration of the measurement interval. The context is then re-initialized.

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