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Configuring Hybrid Mode and ESMC Quality Level Mapping on ACX Series Routers

You can configure hybrid mode (that is, the combined operation of Synchronous Ethernet and Precision Time Protocol (PTP)) on ACX Series routers. The combined operation is possible only when the PTP client and the Synchronous Ethernet source are on the same device and are traceable to the same primary. When acting as a PTP client, the router can accept any external Synchronous Ethernet clock as reference. Note that when the selected Synchronous Ethernet reference fails, the router continues to work in PTP mode.

In hybrid mode, the synchronous Ethernet equipment clock (EEC) on the MPC derives the frequency from Synchronous Ethernet and the phase and time of day from PTP.

The hybrid mode is configured on the client. On the client, one or more interfaces are configured as Synchronous Ethernet source interfaces.

The ESMC quality level value is mapped to the clock class value either by mapping the PTP clock class to the ESMC quality level or by configuring a user-defined mapping of PTP clock class to ESMC quality level. The following procedures explain configuring hybrid mode with either of the modes in detail.

Configuring the Router in Hybrid Mode

To configure the router in hybrid mode, you must:

  1. Configure Synchronous Ethernet options at the [edit chassis synchronization] hierarchy level:

    • Configure the auto-select mode of operation. You can select the clock source either from a free-run local oscillator or from an external qualified clock.

      When the router is configured with the auto-select option, the router chooses up to two best upstream clock sources. It then uses the clock recovered from one of the sources to lock the chassis clock. If an upstream clock with acceptable quality is not available or if the router is configured in free-run mode, the router uses the internal oscillator.

    • Configure the esmc-transmit and network-option options at the [edit chassis synchronization hierarchy level.

    • Configure one or more interfaces at the [edit chassis synchronization] hierarchy level as Synchronous Ethernet sources as needed.

  2. Configure PTP options at the [edit protocols ptp] hierarchy level.
  3. Configure hybrid mode options at the [edit protocols ptp slave] hierarchy level.

Configuring Hybrid Mode with Mapping of the PTP Clock Class to the ESMC Quality Level

To configure hybrid mode options with mapping of the PTP clock class to the ESMC quality level, perform the following steps:

  1. In configuration mode, go to the [edit protocols ptp slave] hierarchy level:
  2. Configure the convert-clock-class-to-quality-level option to set the default mapping between the ESMC SSM quality level and the PTP clock class.
  3. Configure the hybrid mode option on the client.
  4. Configure the upstream unicast PTP primary interface and IP address of the clock source.
  5. Configure one or more Synchronous Ethernet source interfaces for the client as needed.
    Note:

    You must first configure these interfaces at the [edit chassis synchronization] hierarchy level as Synchronous Ethernet sources. For information about configuring these interfaces, see synchronization (ACX Series).

Configuring Hybrid Mode with a User-Defined Mapping of the PTP Clock Class to the ESMC Quality Level

To configure hybrid mode options with a user-defined mapping of the PTP clock class to the ESMC quality level, perform the following steps:

  1. In configuration mode, go to the [edit protocols ptp slave] hierarchy level:
  2. To override the default mapping option, perform the following steps:

    1. Configure the clock-class-to-quality-level-mapping option with one of the quality level values. The quality level values are prc, prs, sec, smc, ssu-a, ssu-b, st2, st3, st3e, st4, stu, and tnc.

    2. Configure the clock-class option for the set quality level. The clock class value ranges from 80 through 109.

  3. Configure the hybrid mode option on the client.
  4. Configure the upstream PTP primary interface and the IP address of the clock source.
  5. Configure one or more Synchronous Ethernet source interfaces for the client as needed.
    Note:

    You must first configure these interfaces at the [edit chassis synchronization] hierarchy level as Synchronous Ethernet sources. For information about configuring these interfaces, see synchronization (ACX Series).

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