Man Fung Lau

20040255186, Dec 16, 2004

May 27, 2003

10/445541

Man Lau - Summit NJ, US

Lucent Technologies, Inc. - Murray Hill NJ

H02H003/05

714/006000

Techniques and systems for managing failure recovery in redundant systems are described. A pair of redundant system units includes a first unit and a second unit, one of which operates as a primary unit and one of which operates as a backup unit. Upon initiation of operation of a system unit, that unit enters an initial status as the backup unit, so that simultaneous initiation of both units causes a status conflict. Recognition of a status conflict causes status negotiation, so that one unit is designated the primary unit and the other the backup unit. Upon failure of a unit, the other unit checks its status and continues operation if it is the primary unit or transitions to become the primary unit if it is the backup unit. Upon replacement, the failed unit is initialized, being designated as the backup unit. The operating unit continues operation as the primary unit.

20140233944, Aug 21, 2014

Feb 13, 2014

14/179660

Peter Vetter - Murray Hill NJ, US
Alex Duque - Murray Hill NJ, US
Robert L. Farah - Murray Hill NJ, US
Joseph L. Galaro - Murray Hill NJ, US
Man Fai Lau - Murray Hill NJ, US
Wolfgang W. Poehlmann - Stuttgart, DE
Dora van Veen - Murray Hill NJ, US
Haibo Wen - Shanghai, CN

H04J 14/02
H04B 10/079

398 34, 398 67

Tuning an optical network unit (ONU) to an appropriate communication wavelength may be performed by initiating an activation procedure responsive to receiving a wavelength configuration message, and identifying an instruction in the wavelength configuration message to modify a present wavelength used by the network unit to a different wavelength. The process may also provide assigning an optical network unit identifier (ONU-ID) to the network unit, modifying the present wavelength to the different wavelength, and transmitting subsequent data messages from the network unit at the different wavelength.