Nortel Networks Corporation

Mark J Perry

Patrick James Dagert

Stephen C Maglione

Intelligent line testing

The present invention enhances synchronization when frames are transmitted over an intermediate network by incorporating a synchronization code along with a data frame in a transport frame used to transport the data frame over an intermediate network. The synchronization code is generated and used to check framing and correct framing errors when the data frames are extracted from the transport frames.

Frame synchronization over multiple networks

Error correction for frames carried over multiple networks

The present invention provides a method and apparatus used in an AO/DI networking service that automatically changes thresholds that increase or decrease bandwidth to cause a corresponding change in the rate of data transfer capacity. The AO/DI networking service uses apparatus that comprises a circuit switched network having an end office with a network management center that monitors the circuit switched network. A computer and a packet switched network are connected to the circuit switched network. An ISP connected to the packet switched network and the end office is used for determining the status of telephone circuits in the circuit switched network serving both the computer and the ISP. Once this status is determined, the AO/DI automatically changes thresholds for increasing and decreasing bandwidth thereby effecting a corresponding change in the rate of data transfer capacity for an AO/DI subscriber.

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Cary, NC, United States of America

Mark J Perry