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.

Signatures for facilitating hot upgrades of modular software components

Abstract: The present invention provides a method and apparatus for facilitating hot upgrades of software components within a telecommunications network device through the use of “signatures” generated by a signature generating program. After installation of a new software release within the network device, only those software components whose signatures do not match the signatures of corresponding and currently executing software components are upgraded. Signatures promote hot upgrades by identifying only those software components that need to be upgraded. Since signatures are automatically generated for each software component as part of putting together a new release a quick comparison of two signatures provides an accurate assurance that either the software component has changed or has not. Thus, signatures provide a quick, easy way to accurately determine the upgrade status of each software component.

Roadmap of optical communications

Abstract: Lightwave communications is a necessity for the information age. Optical links provide enormous bandwidth, and the optical fiber is the only medium that can meet the modern society's needs for transporting massive amounts of data over long distances. Applications range from global high-capacity networks, which constitute the backbone of the internet, to the massively parallel interconnects that provide data connectivity inside datacenters and supercomputers. Optical communications is a diverse and rapidly changing field, where experts in photonics, communications, electronics, and signal processing work side by side to meet the ever-increasing demands for higher capacity, lower cost, and lower energy consumption, while adapting the system design to novel services and technologies. Due to the interdisciplinary nature of this rich research field, Journal of Optics has invited 16 researchers, each a world-leading expert in their respective subfields, to contribute a section to this invited review article, summarizing their views on state-of-the-art and future developments in optical communications.

Real Interference Alignment: Exploiting the Potential of Single Antenna Systems

Abstract: In this paper, we develop the machinery of real interference alignment. This machinery is extremely powerful in achieving the sum degrees of freedom (DoF) of single antenna systems. The scheme of real interference alignment is based on designing single-layer and multilayer constellations used for modulating information messages at the transmitters. We show that constellations can be aligned in a similar fashion as that of vectors in multiple antenna systems and space can be broken up into fractional dimensions. The performance analysis of the signaling scheme makes use of a recent result in the field of Diophantine approximation, which states that the convergence part of the Khintchine-Groshev theorem holds for points on nondegenerate manifolds. Using real interference alignment, we obtain the sum DoF of two model channels, namely the Gaussian interference channel (IC) and the X channel. It is proved that the sum DoF of the K-user IC is (K/2) for almost all channel parameters. We also prove that the sum DoF of the X-channel with K transmitters and M receivers is (K M/K + M - 1) for almost all channel parameters.

Granular management of network resources

Abstract: The present invention provides a method and apparatus for granular management of network resources by accessing network device resources through associated references. In one embodiment, the references are group names, and one or more resources (i.e., a resource collection) within each network device in a telecommunications network may be linked with one or more group names. Group names (or other types of references) may then be used to limit a user's access to particular network device resources. That is, a user may only have access to those resources associated with group names to which the user has access. Over time, network device resources may be associated or disassociated with particular group names. As a result, group names provide users with dynamic access to network device resources. In one embodiment, the groups to which a user has access are defined within a user profile associated with the user. Grouping network device resources, therefore, allows for a granular view of each network device in the network by limiting a user's access to those resources corresponding to group names listed in their user profile. As one example, grouping may allow for customer network management—that is a customer's view is limited to only those network device resources for which they have subscribed.

VPI/VCI availability index

Abstract: The present invention provides a method and apparatus for improving the configuration of virtual connections. Specifically, virtual path identifier (VPI) and virtual channel identifier (VCI) Availability Indexes are made available to network administrators. The Availability Indexes present valid, available values. Thus, the potential for misconfigurations is reduced and even less experienced network administrators may easily configure virtual connections. The Availability Indexes provide administrators with control over exactly which paths and channels are allocated for each connection while eliminating the guesswork and tracking burden present in current network/element management systems. Availability Indexes also reduce the time and frustration required to configure virtual connections.