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Precision Time Protocol (PTP)

  • Support for frequency and phase offset relaxation (ACX7024 and ACX7024X)—You can relax the frequency and phase offsets required for a Precision Time Protocol (PTP) lock. Configure the frequency-lock-threshold and phase-adjust-threshold options of the ptp statement, to relax these parameters. You can also relax the maximum phase offset to adjust in a phase-aligned state by using the phase-adjust-threshold statement in the PTP configuration.

    [See ptp.]

  • PTP passive and timeReceiver port monitoring with SNMP MIB support (ACX7020-AC, ACX7020-DC, ACX7024, ACX7024X, ACX7100-32C, ACX7100-48L, ACX7332, ACX7348, and ACX7509)—You can enhance router performance monitoring through Precision Time Protocol (PTP) passive port monitoring, timeReceiver port monitoring, and SNMP MIB integration. This feature allows you to collect detailed metrics for active PTP timeReceiver ports using IEEE 1588-2019 standards, including timeTransmitter-timeReceiver delay and sync message transmission. Use show ptp global-information and show ptp passive-port-monitor-status commands to display performance statistics, ensuring efficient network management. Passive monitoring alerts you to potential fiber asymmetries or clock failures, improving network reliability by identifying issues when phase thresholds are exceeded.

    [See PTP Passive Port Performance Monitoring.]

  • Assisted Partial Timing Support G.8275.2 enhancements: configurable clock class threshold and support for multiple timeReceiver clocks (ACX7024 and ACX7024X)—Deploy Assisted Partial Timing Support (APTS) to use Global Navigation Satellite System (GNSS) as the primary timing source with Precision Time Protocol (PTP) (G.8275.2) as backup. During GNSS outages, maintain phase and frequency using measured PTP delay asymmetry.

    With the newly introduced enhancements on APTS in this release, you can now configure the clock-class threshold. The system will consider the upstream PTP timeTransmitter as a backup source only if it's clock class is less than or equal to the set threshold value. You can also increase APTS backup capacity by enabling up to four PTP timeReceiver ports.

    [See Assisted Partial Timing Support on ACX7024 and ACX7024X Routers.]

  • Assisted Full Timing Support with GNSS as primary and PTP and Synchronous Ethernet as backup sources (ACX7024, ACX7332, and ACX7348)—Use Assisted Full Timing Support (AFTS) to enhance timing resilience by prioritizing Global Navigation Satellite System (GNSS) and use G.8275.1 (PTP and Synchronous Ethernet) as a backup source. This profile protects against spoofing, jamming, or atmospheric issues, helping you avoid costly holdover. During normal operation, source time from the local primary reference time clock (PRTC) or grandmaster sourced by GNSS. On GNSS failure, AFTS automatically falls back to PTP and Synchronous Ethernet. This AFTS configuration maintains phase and frequency without extended holdover and uses the physical layer clock if PTP is unavailable.

    [See Assisted Full Timing Support.]