Ciena Corporation

Eddie Fung

Steven Arvo Surek

Ted Kirk Woodward

Martin C Nuss

Lawrence J Nociolo

Brandon C Collings

Douglas James Beckett

Larry Nociolo

Jon Peticolas

Steve Surek

The present disclosure relates to systems and methods for geographically-diverse redundant servers and the like interconnected via wavelength division multiplexed (WDM) systems with managed path differential delay of the WDM systems. The present disclosure provides transport systems and methods incorporating absolute time references, such as global positioning system (GPS) time references and/or the like, and selective buildout delays, such as first-in, first-out (FIFO) buildout delays and/or the like. In one exemplary embodiment, the transport systems and methods of the present invention are used in conjunction with the International Business Machine Corporation (IBM) Geographically-Dispersed Parallel Sysplex (GDPS) integrated, automated application and data availability solution to meet and/or exceed the associated 10 microseconds transmit/receive path differential delay requirement. Other comparable uses are also contemplated herein, as will be obvious to those of ordinary skill in the art.

Geographically-diverse redundant servers over optical connections with managed path differential delay

In various exemplary embodiments, the present invention provides transport systems and methods incorporating absolute time references, such as global positioning system (GPS) time references and/or the like, and selective buildout delays, such as first-in, first-out (FIFO) buildout delays and/or the like. In one exemplary embodiment, the transport systems and methods of the present invention are used in conjunction with the International Business Machine Corporation (IBM) Geographically-Dispersed Parallel Sysplex (GDPS) integrated, automated application and data availability solution to meet and/or exceed the associated 10 microseconds transmit/receive path differential delay requirement. Other comparable uses are also contemplated herein, as will be obvious to those of ordinary skill in the art.

Transport systems and methods incorporating absolute time references and selective buildout delays

The present invention provides a colorless multiplexing system and method for detecting new optical channels at power levels below that which would cause data errors in existing traffic, and on top of background light, thus, overcoming a known risk inherent in colorless multiplexing&#x2014;that a channel of the same wavelength as an existing channel is incorrectly added to the original working, traffic-carrying, channel's path.

System and method for a channel guard in a reconfigurable optical add-drop multiplexer

A network element for incorporating in nodes of a network that is a transparent, subwavelength networks. The element is configurable and adapted to support an arbitrary protocol, with protocol-specific monitoring features as well as protocol-independent add/drop capability. An arrangement that allows transmission of client signals with higher clock fidelity is achieved by developing a phases offset measure at an ingress node, communicating it to the egress node, and recovering the client's clock from the received data and from the received phase-offset information. The ability to recover the client's clock with high fidelity is enhanced by modified pointer processing in intermediate nodes of the network that the client's signal traverses. The pointer processing is modified to inject positive and negative justifications in excess of what is minimally necessary to insure proper transmission over a network that employs a protocol involving framing layer frames embedded in communication layer frames. Illustratively, the network protocol is an extended G.709 Digital Wrapper protocol, arranged to employ frames of 15240 columns by four rows.

Apparatus for implementing transparent subwavelength networks

Both link-level and path-level performance monitoring is obtained in any point of a multi-link network where transmitting points in the network are adapted to transmit codes only from a subset of the codes that receiving points in the network are adapted to receive, with one of the codes that transmitting points are adapted to transmit being chosen to represent an error-reporting code, and substituting, at monitoring points, any received code that is not one of the codes in the subset with the error-reporting code. By measuring the number of received codes that are in error, a link-level error measure is obtained, and by measuring the number of error-reporting codes, a path-level measure is obtained.

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Englishtown, NJ, United States of America

Eddie Fung