Fujitsu Corporation

Larry Henry Steinhorst

Francois G Moore

Junji Yamamoto

Wilson Kit-man Chan

Jim O Goodwin

Wilson K Chan

According to one embodiment of the invention, a method for providing communications service in a communications ring undergoing an upgrade process includes increasing an existing rate of a node to a higher rate. With the increase, the node is operable to transmit a second frame at the higher rate. The second frame has a higher number of time slots than a first frame having a number of slots equal to N. The method also includes occupying a number of the time slots of the second frame equal to N using data to be received by an existing node. The method also includes providing at least one identifier to the existing node that will receive the second frame. The identifier identifies the occupied time slots of the second frame. The method also includes transmitting the second frame of data to the existing node.

Method and system for upgrading a fiber optics network

A method for monitoring an optical network includes communicating optical traffic along a working path of an optical network. The optical network comprises a protection path for the optical traffic to communicate the optical traffic upon a failure in the working path. The protection path comprises two or more network elements coupled together by optical lines. The method also includes monitoring an idle signal of the protection path to detect an error in the protection path comprising an error in a component of one or more of the network elements.

Method and system for monitoring an optical network

A method is provided for monitoring a network that includes providing a path selector that can select between a first input and a second input, where the first input is coupled to a customer premises equipment interface that is operable to receive signals from customer premises equipment and the second input is coupled to a test signal generator that is operable to generate test signals. The method also includes determining whether operating customer premises equipment is coupled to an input of the customer premises equipment interface that is coupled to the first input of the path selector. If not, then an idle state is entered into. While in the idle state, it is determined whether a signal is received from the customer premises equipment interface at the first input of the path selector. The test signal received at the second input of the path selector is selected unless a signal is received from the customer premises equipment interface at the first input. The method also includes communicating the test signal from the path selector to the network.

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Plano, TX, United States of America

Larry Henry Steinhorst