US 12,495,230 B2
Rangeless failover in PON protection switching
Edward Wayne Boyd, Gilbert, AZ (US); James A. Teborek, Mansfield, MA (US); Jean-Christophe Marion, Petaluma, CA (US); and Mark Edward Laubach, Santa Clara, CA (US)
Assigned to Ciena Corporation, Hanover, MD (US)
Filed by Ciena Corporation, Hanover, MD (US)
Filed on Nov. 20, 2023, as Appl. No. 18/513,982.
Prior Publication US 2025/0168540 A1, May 22, 2025
Int. Cl. H04Q 11/00 (2006.01)
CPC H04Q 11/0067 (2013.01) [H04Q 11/0066 (2013.01); H04Q 2011/0086 (2013.01); H04Q 2011/0088 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An Optical Line Terminal (OLT) comprising:
a transmitter configured to connect to a plurality of Optical Network Units (ONUs) on a downstream channel;
a receiver configured to connect to the plurality of ONUs on an upstream channel; and
circuitry communicatively coupled to the transmitter and the receiver, wherein the circuitry is configured to
responsive to protection switch from a primary OLT, enable the transmitter on the downstream channel, and
utilize a Dynamic Bandwidth Assignment (DBA) function on the downstream channel with a guard time that includes a normal guard time plus a differential time added thereto,
wherein the differential time is one of (i) based on a differential between a closest ONU and a farthest ONU, relative to the primary OLT, prior to the protection switch, or (ii) a configured value based on a topology of an Optical Distribution Network (ODN).