Asynchronous transfer mode (ATM) cell arrival monitoring system

Multiplex communications – Pathfinding or routing – Switching a message which includes an address header

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370473, 370474, H04L 1256

Patent

active

057401730

ABSTRACT:
A system is provided for monitoring cell arrival in an asynchronous transfer mode (ATM) network, particularly for the detection and handling of lost and misinserted cells. A received cell is accepted (i.e., the user data conveyed in its payload is used for the reassembly process of a transported user signal) if it is recognized as the next expected cell. Otherwise, an acceptance decision for the received cell is delayed if it is not recognized as the next expected cell. The delay occurs until either reception of a subsequent cell or until the acceptance decision is prompted by a predetermined condition of a user data buffer. The predetermined condition of the user data buffer is an emptying of the user data buffer to a point that reassembly of the transported user signal would be unstable. If necessary, dummy data is generated while delaying an acceptance decision for the received cell. An acceptance decision which is prompted by the predetermined condition of a user data buffer is made taking into account whether a cell whose acceptance decision has been delayed is present in the cell arrival buffer. In addition, the system makes a determination regarding whether cell losses or an insufficient cell delay variation (CDV) compensation causes the user data buffer to reach the predetermined condition.

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