US 11,916,661 B2
Distributing timing over metro transport networking
Sebastien Gareau, Ottawa (CA); and Andrew McCarthy, Kanata (CA)
Assigned to Ciena Corporation, Hanover, MD (US)
Filed by Ciena Corporation, Hanover, MD (US)
Filed on Jun. 27, 2019, as Appl. No. 16/454,807.
Prior Publication US 2020/0412471 A1, Dec. 31, 2020
Int. Cl. H04J 3/06 (2006.01); G06F 11/16 (2006.01)
CPC H04J 3/0673 (2013.01) [G06F 11/1679 (2013.01); H04J 3/0667 (2013.01); H04J 3/0697 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An apparatus comprising:
circuitry configured to detect a specific block in transmitted blocks, wherein each block of the transmitted blocks is encoded based on a line code, and to sample an output of a clock to determine a timestamp reference based on detection of the specific block that has an operational code (O code) denoting timing transfer; and
circuitry configured to transmit timing information based on the timestamp reference.