Patents by Inventor Ajay Sandhir

Ajay Sandhir has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Time synchronization in passive optical networks
    Patent number: 11843453
    Abstract: 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.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: December 12, 2023
    Assignee: Cisco Technology, Inc.
    Inventors: Prashant Anand, Ashok Chandre Gowda, Ajay Sandhir
  • TIME SYNCHRONIZATION IN PASSIVE OPTICAL NETWORKS
    Publication number: 20220329337
    Abstract: 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.
    Type: Application
    Filed: April 7, 2021
    Publication date: October 13, 2022
    Inventors: Prashant Anand, Ashok Chandre Gowda, Ajay Sandhir