AT&T Intellectual Property I, LP

Mehran Esfandiari

Laxman Sahasrabuddhe

In a particular embodiment, a method of evaluating a network is disclosed. The method identifies potential failure points between a layer two asynchronous transfer mode network and a layer one Synchronous Optical Network (SONET) network. The method includes identifying a first set of circuit identifiers of inter-nodal links of a layer two asynchronous transfer mode (ATM) network, correlating a second set of circuit identifiers associated with elements of a layer one SONET network, identifying a subset of the first set of circuit identifiers of those inter-nodal links that are mated with each other, and comparing the subset of the first set of circuit identifiers to the second set of circuit identifiers to identify single point of failure elements including interface elements and add drop multiplexer elements.

Method and system of evaluating survivability of ATM switches over SONET networks

A method of providing a data file that defines a modified SONET ring network including at least one sub-tending ring is disclosed. The method comprises identifying a set of low data rate sub-tending ring candidate traffic handling elements within a SONET ring network to be modified. For a first candidate element of the set of low speed sub-tending ring candidate traffic handling elements, the method includes evaluating selected characteristics of a first parent SONET UPSR ring with respect to adding the first candidate element sub-tending SONET ring. Based on a positive evaluation of each of the selected characteristics of the parent SONET ring, the method includes creating a data model that indicates addition of the first and subsequent candidate element sub-tending SONET ring to the parent SONET ring, and providing a data file based on the data model that defines a modified SONET ring network including the parent SONET ring(s) and the sub-tending SONET rings.

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Oakland, CA, United States of America

Mehran Esfandiari