Nortel Networks Corporation

Ciena Corporation

Aris Tombul

Andrew L Jarabek

Mark Brian Carson

Robert G Gibbins

Karl Hammermeister

Warren Lau

Ho Nguyen

A method and apparatus for efficient provisioning of a VT/TU cross-connect includes checking a state of a control bit that specifies whether to assemble an output from multiple virtual tributary (VT1.5/VT2) or tributary unit (TU11/TU12) connections or handle the output as an synchronous transport signal (STS) or administrative unit (AU-3/AU-4) connection, and switching a predetermined number of entries together based on a state of the control bit.

Efficient provisioning of a VT/TU cross-connect

A method and apparatus for managing latency includes receiving data from synchronous transport signals (STS) and virtual tributary (VT) sources, providing a provisioning bit for each output associated with a memory, and adjusting a pointer for the VT sources based on the provisioning bit such that the STS and VT outputs are synchronized.

Managing payload specific latencies in a cross-connect system

A technique for provisioning cross-connects in network switching environment includes receiving a portion of the an input data stream including having header data and the payload data, the payload data occurring at a first offset relative to the header data and generating a delayed version of the portion of the input data stream. The technique also includes generating a portion of a retimed data stream by selecting between the portion of the input data stream and the delayed version of the portion of the input data stream, the retimed data stream including the header data and the payload data, the payload data occurring at a second offset relative to the header data.

Managing data in a subtended switch

A method and apparatus for detecting errors in a memory includes generating a first check word based on incoming data and generating a second check word based on stored data. The method includes comparing the first check word to the second check word, generating a comparison result, and indicating a failure based on the comparison result.

Memory integrity self checking in VT/TU cross-connect

A technique for provisioning cross-connects in network switching environment includes writing a first set of data into a first memory element during a first time interval and writing a second set of data into a second memory element during a second time interval. The technique reads a portion of the first set of data from the first memory element during the second time interval and reads a portion of the second set of data from the second memory element during a third time interval, and determines the first, second, and third time intervals based on a format of the sets of data, with the first time interval ending before the second time interval begins, and the second time interval ending before the third time interval begins.

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