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1. (WO2017192894) SYSTEMS AND METHODS FOR PERFORMING OPTICAL LINE TERMINAL (OLT) FAILOVER SWITCHES IN OPTICAL NETWORKS

Pub. No.:    WO/2017/192894    International Application No.:    PCT/US2017/031125
Publication Date: Fri Nov 10 00:59:59 CET 2017 International Filing Date: Fri May 05 01:59:59 CEST 2017
IPC: H04B 10/032
H04J 3/06
H04J 14/00
H04Q 11/00
Applicants: ADTRAN, INC.
Inventors: CRESS, Jared, D.
POLK, Charles, E.
PADUR, Nagaraj
Title: SYSTEMS AND METHODS FOR PERFORMING OPTICAL LINE TERMINAL (OLT) FAILOVER SWITCHES IN OPTICAL NETWORKS
Abstract:
A system for performing failover switches in an optical network, such as a time and wavelength division passive optical networks (TWDM PON) like NG-PON2, includes a backup optical line terminal (OLT) for backing up communications of a primary OLT. The backup OLT is configured to allocate small upstream time slots, referred to herein as "de minimis" time slots, to at least one optical network terminal (ONT) communicating with the primary OLT during normal operation. When a failure occurs that prevents communication between the ONT and the primary OLT, the ONT autonomously tunes to the upstream and downstream wavelength pairs of the backup OLT and begins to transmit data to the backup OLT in the de minimis time slot allocated to it. The presence of data in the de minimis time slot indicates the occurrence of a failover switch to the backup OLT, and the backup OLT then begins to allocate time slots to this ONT.