Time synchronization in passive optical networks

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United States of America Patent

PATENT NO 11843453
APP PUB NO 20220329337A1
SERIAL NO

17224532

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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This technology allows time synchronization in passive optical networks (“PON”). A first Ethernet device timestamps and transmits a packet to a second Ethernet device via the PON. The first Ethernet device transmits the packet to a small form-factor pluggable (“SFP”) device within the PON and connected to the first Ethernet device. The SFP device determines a transmission time to a second SFP device and modifies a correction field (“CF”) of the packet by subtracting an ingress time and the transmission time from the CF. The packet is transmitted to the second SFP device, which modifies the CF by the addition of an egress time. The modified CF value represents the real-time transmission delay incurred in the SFP devices. The packet is transmitted to a second Ethernet device to synchronize a clock using the timestamp and the CF value in accordance with the PTP/IEEE-1588 standard.

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Patent Owner(s)

  • CISCO TECHNOLOGY INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Anand, Prashant Bangalore, IN 54 1694
Gowda, Ashok Chandre Bangalore, IN 1 1
Sandhir, Ajay Bengaluru, IN 1 1

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