Method for automatic setup of missing RM cell count parameter CRM in an ATM traffic management descriptor

摘要

A method of measuring the round trip time (RTT) of a virtual circuit (VC) utilizing the Traffic Management mechanism of ATM and adapting the CRM (also known as XRM) Traffic Management descriptor parameter accordingly. The CRM parameter is setup adaptively and individually for a particular VC in real time while traffic is flowing so as to achieve better performance of the network. The invention comprises CRM calculation means, a database for storage of RM cell related information, including but not limited to, RM cell assigned sequence numbers, transmission times, reception times, etc., means for filtering the transmission and reception times. The CRM calculator functions to track the transmission and reception of RM cells from the source end station using a unique sequence number assigned to each RM cell. Filters can optionally be used to smooth the data recorded that is derived from RM cell transmission events, e.g., calculated round trip time (RTT).