Ciena Corporation

Alexander Young

Anurag Prakash

Mohit Chhillar

Matthew Yuen

Sebastien Gareau

Craig Donald Suitor

Christopher John Brown

Stuart C White

Sitaram Patro

Steven Arvo Surek

Jeffery Thomas Nichols

Jeffrey Scott Moynihan

Richard Murray Wyatt

Piyush Sharma

Alwyn Joy George

Tim Norman

Gerald L Swinkels

Risheek Puri

A network element includes at least two Time Division Multiplexing (TDM) modules each including a TDM client interface, TDM processing circuitry, and circuit emulation circuitry; and a packet switch fabric connected to the at least two TDM modules in a Link Aggregation Group (LAG) for a protected TDM service, and configured to output a packet interface, wherein the protected TDM service is provided as a single packetized TDM stream via the packet interface from the packet switch fabric.

Legacy time division multiplexing (TDM) service support in a packet network and on a packet network element

A network element includes at least two Time Division Multiplexing (TDM) modules each including a TDM client interface, TDM processing circuitry, and circuit emulation circuitry; and a packet switch fabric connected to the at least two TDM modules and configured to output a packet interface, wherein a protected TDM service through the at least two TDM modules is provided as a single packetized TDM stream via the packet interface from the packet switch fabric.

Systems and methods for path computation of a service in a multi-layer network including a client layer and a server layer include determining correlations between the client layer and the server layer; assigning data to one of client layer links and server layer links based on diversity between one another responsive to the determined correlations; and determining a resiliency path for a service from a current path using the data to determine diversity between the resiliency path and the current path in the client layer and the server layer.

Multi-layer network resiliency systems and methods

A method, implemented in a hybrid network element supporting switching at a plurality of layers, for multilayer resource management between the plurality of layers, includes operating a control plane at Layer N between a plurality of network elements in a network, wherein control plane signaling at the Layer N is processed at each network element in a path for a service in the network; and operating a resource management protocol at Layer N+1 with another network element in the network by injecting and extracting messages from and to the control plane into a data path in the Layer N+1, wherein a service at the Layer N+1 operates over the Layer N, and wherein the resource management protocol messages are processed at an originating network element and a terminating network element and not at intermediate network elements in the path.

Multilayer resource management and arbitration in transport networks

Systems and methods providing resiliency between a server layer and a client layer include determining a minimal spanning tree in the client layer; determining a Steiner tree in the server layer based on vertices associated with the minimal spanning tree in the client layer; and determining one or more resiliency paths in the client layer based on the minimal spanning tree and the Steiner tree, wherein the one or more resiliency paths are added to the minimal spanning tree in the client layer based on potential failures in the Steiner tree. For example, the server layer is an optical layer and the client layer is a Time Division Multiplexing (TDM) layer.

An Optical channel Data Unit flex (ODUflex) resizing method, node, and network include determining that the ODUflex needs resizing, wherein the ODUflex is configured in the network on a current path between the node and a second node in the network; when the resizing is a decrease, reducing a size of the ODUflex by i) a resize decrease operation using a control plane or ii) a Link Aggregation Group and Make-Before-Break operation; and, when the resizing is an increase, increasing a size of the ODUflex by i) a resize increase operation using a control plane or ii) a Link Aggregation Group and Make-Before-Break operation. The method provides hitless resizing without using ITU Recommendation G.7044/Y.1347 (10/11) and can perform the reducing or the increasing changing bandwidth of the ODUflex by approximately 100 G in less than a second.

ODUflex resizing systems and methods

An Optical Transport Network (OTN) method, an OTN switching node method, and an OTN node utilize a 'double wrapper' configuration to eliminate clock transients in OTN networks. That is, the systems and methods bury an ODU beneath another overclocked ODU thereby eliminating any interruptions due to clock transients, framing events or other disruptions. For example, an ODU2 can be mapped into an ODU2e, an ODU3 can be mapped into an ODU3e2, an ODU4 can be mapped into an ODUG or some other overclocked variant of ODU4, and the like. Specifically, ODU2e, ODU3e2, ODUG, etc. are overclocked variants of ODU2, ODU3, ODU4, etc. The systems and methods propose to use these overclocked signals to carry standard ODU signals to eliminate clock transient problems.

Optical transport network clock transient suppression systems and methods

An Optical Transport Network (OTN) transient management method, OTN node, and OTN network includes operating an OTN connection in a first mode in a network, the OTN connection traverses at least two nodes in the network, requesting a change in the OTN connection to a second mode which will cause a network transient, the change includes a timing change on the OTN connection affecting the at least two nodes, and performing transient management at the at least two nodes to mitigate the network transient, the transient management prevents spurious alarms due to the change between the first mode and the second mode.

Growing community of inventors

Ottawa, Canada

Alexander Young