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Setting Up SyncE
  • 25 Feb 2022
  • 6 Minutes to read
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Contents

Setting Up SyncE

  • Updated on 25 Feb 2022
  • 6 Minutes to read
  • Contributors
  • Print
  • PDF
Article summary

The synchronous Ethernet (SyncE) feature can be used to synchronize Ant2, Nano2 Copper and Nano2 Optical over Ethernet networks. SyncE takes the clock signal from the selected clock reference port and transmits it to all other ports.

Notes:
SyncE is not supported on Skylight sensor: module 10G.

SyncE can be enabled onNano2 copper in SGMII mode but the host must configure the mastership that matches the ESMC clock selection. Otherwise, SyncE will not function.

▶ To set SyncE

  1. Access the page System ▶ Configuration ▶ Time ▶ SYNCE.

  2. Select Enable SyncE.

  3. Select a Manual clock source or enable ESMC QL (automatic clock source selection using ESMC), then click Apply.

Note: SyncE settings can be edited from the Clock List by selecting a Clock name.

CAUTION: Configuring the clock-source is setting the Mastership mode (for the copper ports). If two ports connected together are both "Force to Master" or both "Force to Slave"a "port-down" will occur. If the NNI port is down after port configuration, there is a rollback mechanism to revert to the previous valid configuration.

For more information on specific parameters, refer to the following table.

SyncE (System ▶ Configuration ▶ Time ▶ SyncE)

ParameterDescription
Enable SyncEEnables or disables the synchronous Ethernet feature.
  • When disabled, the clock slave will be selected automatically depending on the port status and the copper ports Mastership Mode (visible under Port ▶ Configuration) will show Auto.

    Note: This is for copper only and not applicable to fiber.

    • When enabled, SyncE will affect copper ports Mastership Mode. If the port is copper and set as the receiving primary clocksource, the Mastership mode will show Forced to Slave. On theopposite port (if it is a copper port), the Mastership mode willshow Forced to Master. When Enabled, the clock reference port (s) operate as clock slave(s) and all the other ports on the system operate as masters, transmitting clock signal from clock reference port.
    • SyncE/ESMC statusThis reports the status of the SyncE/ESMC, such as:
    • Clock selector
    • UNI and NNI clock status
    • Clock selection change count
    • Current QL state
    For more information see ESMC Port Statistics.
    SyncE/ESMC port statistics summaryThis reports the port statistics summary of the SyncE/ESMC

    Option

    ParameterDescription
    Manual clock sourceThis sets the clock selector to use a specific clock source, either the UNI or the NNI port, when SyncE is Enabled.
    ESMC QL modeEnables the automatic clock source selection using ESMC.

    Viewing SyncE/ESMC Statistics

    SyncE/ESMC statistics can be viewed by accessing the SyncE/ESMC statistics page.

    ▶ To view SyncE/ESMC statistics

    1. Access the page System ▶ Configuration ▶ Time ▶ Clock Name ▶ SyncE/ESMC port statistics summary ▶ Port Name.

      The SyncE/ESMC statistics page is displayed.

    For more information on specific parameters, refer to the following section.

    SyncE/ESMC statistics (System ▶ Configuration ▶ Time ▶ Clock Name ▶ SyncE/ESMC port statistics summary ▶ Port Name) Parameters

    Current state to Clock Selection Process: The current state (QL,timeout,wait-to-restore, holdover, port-state) used for the clock selection process.

    Last QL Received: Indicates the last QL received on the port.

    Last QL Sent: Indicates the last QL sent to the port.

    Wait-to-restore Remaining: Indicates the remaining wait-to-restore period, expressed in seconds.

    Current timeout: Indicates the duration since the last ESMC PDU received, if over 5 seconds.

    Count of ESMC PDU Received: Indicates the number of ESMC PDU that have been received.

    Count of ESMC PDU Malformed Received: Indicates the number of ESMC PDU Malformed that have been received.

    Count of ESMC PDU of Type Event Received: Indicates the number of ESMC PDU that have been received with the type event (event flag set to 1).

    Count of ESMC PDU Received with Valid QL and Extended TLVs: Indicates the number of ESMC PDU that have been received with valid QL and extended TLVs.

    Count of ESMC PDU Received with QLSTU/ UNK:Indicates the number of ESMC PDU that have been received with the Quality Level STU/UNK:

    • (Option 2) QL-STU: Synchronized – Traceability unknown.
    • (Option 3) QL-UNK: This synchronization trail transports a timing quality generated by an unknown clock source. It is at least of quality SSU.

    Count of ESMC PDU Received with QL-PRS: Indicates the number of ESMC PDU that have been received with the Quality Level PRS:

    • (Option 1) QL-PRS: Primary reference source traceable [ITU-TG.811]

    Count of ESMC PDU Received with QL-PRC: Indicates the number of ESMC PDU that have been received with the Quality Level PRC:

    • (Option 1) QL-PRC: This synchronization trail transports a timing quality generated by a primary reference clock that is defined in
      [ITU-T G.811].

    Count of ESMC PDU Received with QL-INV3: Indicates the number of ESMC PDU that have been received with Quality Level Invalid Code 3.

    Count of ESMC PDU Received with QL-SSUA/TNC: Indicates the number of ESMC PDU that have been received with the Quality Level SSU-A/TNC:

    • (Option 1) QL-SSU-A: This synchronization trail transports a timing quality generated by a type I or V slave clock that is defined in [ITUT G.812].
    • (Option 2) QL-TNC: Traceable to transit node clock ([ITU-T G.812], type V).

    Count of ESMC PDU Received with QL-INV5: Indicates the number of ESMC PDU that have been received with Quality Level Invalid Code 5.

    Count of ESMC PDU Received with QL-INV6: Indicates the number of ESMC PDU received with Quality Level Invalid Code 6.

    Count of ESMC PDU Received with QL-ST2: Indicates the number of ESMC PDU that have been received with the Quality Level ST2:

    • (Option 2) QL-ST2: Traceable to stratum 2 (ITU-T G.812], type V).

    Count of ESMC PDU Received with QL-SSU-B: Indicates the number of ESMC PDU that have been received with the Quality Level SSU-B:

    • (Option 1) QL-SSU-B: This synchronization trail transports a timing quality generated by a type VI slave clock that is defined in [ITU-TG.812].

    Count of ESMC PDU Received with QL-INV9: Indicates the number of ESMC PDU that have been received with Quality Level Invalid Code 9.

    Count of ESMC PDU Received with QLEEC2/ ST3: Indicates the number of ESMC PDU that have been received with the Quality Level EEC2/ST3:

    • (G.8264) QL-EEC2: Synchronous Ethernet equipment clock option 2. This clock option is treated like an ITU-T G.812 type IV clock [i.e., QL-SEC and QL-ST3, respectively]).

    • (Option 2) QL-ST3: Traceable to stratum 3 ([ITU-T G.812], type IV).

    Count of ESMC PDU Received with QLEEC1/ SEC: Indicates the number of ESMC PDU that have been received with the Quality Level EEC1/SEC:

    • (G.8264) QL-EEC2: Synchronous Ethernet equipment clock option 1 (is treated as a ITU-T G.813 option 1).
    • (Option 3) QL-SEC: This synchronization trail transports a timing quality generated by a synchronous equipment clock (SEC) that is defined in [ITU-T G.813] or [ITU-T G.8262], option I.

    Count of ESMC PDU Received with QL-SMC: Indicates the number of ESMC PDU that have been received with the Quality Level SMC:

    • (Option 2) QL-SMC: Traceable to SONET clock self-timed ([ITU-T G.813] or [ITU-T G.8262], option II).

    Count of ESMC PDU Received with QL-ST3E: Indicates the number of ESMC PDU that have been received with the Quality Level ST3E:

    • (Option 2) QL-ST3E: Traceable to stratum 3 ([ITU-T G.812], type IV).

    Count of ESMC PDU Received with QL-PROV: Indicates the number of ESMC PDU that have been received with the Quality Level PROV:

    • (Option 2) QL-PROV: Provisionable by the network operator.

    Count of ESMC PDU Received with QL-DNU: Indicates the number of ESMC PDU that have been received with the Quality Level DNU-DUS:

    • (Option 1) QL-DNU: This signal should not be used for synchronization.
    • (Option 2) QL-DUS: This signal should not be used for synchronization.

    Count of ESMC PDU Sent: Indicates the number of ESMC PDU that have been sent.

    Count of ESMC PDU of Type Event Sent: Indicates the number of ESMC PDU that have been sent with the type event (event flag set to 1).

    Count of ESMC PDU Sent with Extended TLVs: Indicates the number of ESMC PDU that have been sent with extended TLV forwarded.

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