Abstract: A method of automatically detecting fiber cabling errors in an optical network is described. Fiber connectivity between optical nodes in the network, including initial cabling and any subsequent cabling changes or cabling errors, is detected. The connectivity information including initial link connectivity and changes relating to new fiber connectivity is stored. The invention automatically determines cross-connect and lightpath impact of a cabling change, detects if light paths have been automatically rerouted off affected optical links, and supports operator resolution of cabling problems.

Abstract: An optical architecture to simplify optical link engineering and network upgrades for WDM OADM rings is described. Each access site that is joined to an optical transmission medium is provided with a multi-band filter structure that is designed to add/drop all bands in the hubbed ring. In this way bands can be added to the ring without necessitating the re-engineering of the system. The approach is cost effective and more power efficient than the prior art single band filter structures.

Abstract: This application proposes a solution that makes access to the Optical Link State (OLS) information more efficient for use by upper level applications. Applications are independent of underlying routing protocols. This solution applies to all Link State based IGP protocols with the extension to optical networks, including OSPF and IS-IS.

Abstract: A method of mounting a package such as a Butterfly package to a printed circuit board in order to make efficient use of the board's real estate is described. According to a preferred embodiment of the invention the package is mounted on its side such that leads of one side (now the bottom) of the butterfly package are connected either directly to surface mount pads on the PCB or project through and connected to through-holes in the PCB. The leads on the other side (now top) are connected to a flex circuit or ribbon cable. A heatsink can be attached to the package without impinging significantly on the PCB layout.

Abstract: A method of modifying the routing of lightpaths without interrupting service, scheduling long maintenance windows or the need to delete and recreate lightpath definitions is disclosed. The solution utilizes a combination of non-disruptive bridge and roll techniques and uses temporary end to end protection or segment protection to change the routing of the working or protection part of the lightpath without having to take the lightpath out of service. The solution relies on lambda level switching hardware support and software at the two endpoint nodes to coordinate in the event of an operator-initiated protection switch, the switching of connections from the working path to the protected path. Protection switching can be configured to be end to end, single segment only or multi hop protection depending on the application.