Ciena

About: Ciena is a company organization based out in Hanover, Maryland, United States. It is known for research contribution in the topics: Signal & Node (networking). The organization has 1259 authors who have published 1557 publications receiving 25989 citations.

System and method for in-service reconfiguration of a synchronous optical communications network

Abstract: A method and system for in-service reallocation of bandwidth (i.e. STS-1's) in a synchronous optical network (SONET) i.e. without interruption of the transport of data frames transmitted from a transmit node and received at a receive node, the transmit node comprising a mapper/aggregator, a first bandwidth configuration memory associated with the mapper/aggregator and a transmit framer and the receive node comprising a demapper/deaggregator, a second bandwidth configuration memory associated with the demapper/deaggregator and a receive framer. First and second memory banks are provided to the first and second bandwidth configuration memory, whereby the first memory bank of the first bandwidth configuration memory comprises current bandwidth allocation mapping information used by the mapper/aggregator and the first memory bank of the second bandwidth configuration memory comprises current bandwidth allocation mapping information used by the demapper/deaggregator. Updated bandwidth allocation mapping information is provided to the second memory banks. A bandwidth reconfiguration update request is generated and a reconfiguration flag is generated at the transmit node in response to the update request. The reconfiguration flag is transmitted from the transmit node to the receive node and the reconfiguration flag is detected at the receive node. The updated bandwidth allocation mapping information of the first bandwidth configuration memory's second memory bank is selected for use by the mapper/aggregator in response to the generation of the reconfiguration flag and the updated bandwidth allocation mapping information of the second bandwidth configuration memory's second memory bank is selected for use by the demapper/deaggregator in response to the detection of the reconfiguration flag.

Path computation systems and methods for heterogeneous multi-domain networks

Abstract: The present disclosure provides path computation systems and methods operating over heterogeneous multi-domain networks. Specifically, path computation systems and methods utilize PCE mechanisms with additional functionality enabling heterogeneous domain characteristics. In an exemplary embodiment, a network includes a plurality of domains with each domain having a PCE implemented either as a separate server-based application or resident application in a network node. Different methods may be utilized for determining what PCE to access for information. Instead of a list of nodes and links given in a common format, each PCE can compute a path within its domain using a node and link address/identification format of its own, without having to ensure that it can be interpreted by nodes in other domains. This path segment can be further distinguished by a path identifier that verifies that it is created for a particular domain, and avoiding misinterpretation.

Computational complexity of nonlinear transforms applied to optical communications systems with normal dispersion fibers

Abstract: We show that nonlinear transforms based on the Zakharov-Shabat scattering problem are not practical to encode/decode QPSK signals in communication systems with normal dispersion fibers operating with average powers above that of the quasi-linear regime.

Systems and methods for pseudowire-in-pseudowire to transport pseudowire payload across packet switched networks

Abstract: The present invention provides systems and methods which create an infrastructure/transport Pseudowire (PW) a priori between two Provider Edge (PE) devices. Accordingly, other PWs can be mapped to this transport PW. In an exemplary application, the transport PW (which is a MS-PW by itself) can start and end between two Switching Provider Edge (S-PE) devices and span across multiple S-PEs in between. In another exemplary application, the transport PW terminates between two Terminating Provider Edge (T-PE) devices spanning across all S-PEs in between. In a further exemplary application, the transport PW can start at a S-PE or T-PE and terminate at a T-PE or S-PE, respectively. The placement of the endpoints of the transport PW (on two PEs) determines the number of intervening S-PEs that benefit from this application.

Network manager circuit rediscovery and repair

Abstract: The present invention provides a way to discover/rediscover or repair a path in a SONET network using a “bottom-up” approach. In particular, information from nodes in the network is retrieved. The information indicates whether a node in the network cross-connects or adds/drops information in each of the timeslot of a SONET frame. A timeslot that is configured as an add/drop is considered a boundary of the path. Accordingly, based on the timeslots that are configured as boundaries, a path may be discovered/rediscovered or repaired.