Signaling the distributed 1588v2 clock accuracy relative to UTC
AssigneeCiena Corporation
InventorsBashar Abdullah, PengJoo Tan
Life of this patent
Estimating the term…
Abstract
A network element includes circuitry configured to receive information related to clock distribution from Precision Time Protocol (PTP) messages from an upstream network element, determine a delta between a network clock from the information and a Primary Reference Time Clock (PRTC), and transmit the delta in PTP messages to downstream network elements. The circuitry can be further configured to receive a configuration of a clock class of a clock at the network element, and transmit the clock class in the PTP messages with the delta. The clock class can be one of A, B, C, and D from G.8273.2 or G.8273.4.
Claims15
A network element comprising circuitry configured to:
- receive information related to clock distribution from Precision Time Protocol (PTP) messages from one or more upstream network elements,
- determine a delta between a network clock from the information and a Primary Reference Time Clock (PRTC), wherein the delta includes a phase and time offset that collectively represents an accuracy,
- determine a clock class of a clock at the network element,
- transmit the delta and the clock class in PTP messages to one or more downstream network elements,
- wherein the information includes a delta determined by the one ore more upstream network elements and a clock class of a clock at the one or more upstream network elements, received in the PTP messages from the one ore more upstream network elements, and the circuitry is further configured to
- select a timing path from the one or more upstream network elements based on the information, and based on application requirements.
A method comprising:
- receiving information related to clock distribution from Precision Time Protocol (PTP) messages from one or more upstream network elements,
- determining a delta between a network clock from the information and a Primary Reference Time Clock (PRTC), wherein the delta includes a phase and time offset that collectively represents an accuracy,
- determine a clock class of a clock at the network element,
- transmitting the delta and the clock class in PTP messages to one or more downstream network elements,
- wherein the information includes a delta determined by the one ore more upstream network elements and a clock class of a clock at the one ore more upstream network elements, received in the PTP messages from the one ore more upstream network elements, and the steps further include
- selecting a timing path from the one ore more upstream network elements based on the information, and based on application requirements.
A network element comprising circuitry configured to:
- receive information related to clock distribution from Precision Time Protocol (PTP) messages from a plurality of upstream network elements, wherein each PTP message from a given upstream network element includes a delta between a network clock and a Primary Reference Time Clock (PRTC) at the given upstream network element, wherein the delta includes a phase and time offset that collectively represents an accuracy, and ii) a clock class of a clock at the given upstream network element,
- determine a timing path based on the delta and the clock class of the plurality of upstream network element, and based on application requirements, and
- configure the application based on the information.
Dependencies are inferred from the claim text.