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Environment/Versions Spirent TestCenter. SyncE (Synchronous Ethernet). Answer Open Spirent TestCenter Application, reserve at least one port, and create an emulated device. Enable the SyncE option under Technologies... > Carrier Ethernet. Under All Devices enable the Active checkbox for the Spirent emulated device that will run SyncE and select QL-PRC as the Quality Level. If you need STC to be the slave, set the Quality Level to QL-PNU. Important: Confirm the SyncE Option value matches in both, the DUT and STC.  In STC you can find it under: The SyncE tab under the port. The SyncE tab under All Ports. The device with the lower Quality Level (QL) will be the master.  Please refer to the table from below:   SSM QL (Binary) Standard Mappings Given in ITU-T G.781 Specification PTP Clock Class   Option I Option II   0001 - QL-PRS 80 0000 - QL-STU 82 0010 QL-PRC - 84 0111 - QL-ST2 86 0011 . . 88 0100 QL-SSU-A QL-TNC 90 0101 - - 92 0110 - - 94 1000 QL-SSU-B - 96 1001 - - 98 1101 - QL-ST3E 100 1010 - QL-STE/QLEEC2 102 1011 QL-SEC/QL-EEC1 - 104 1100 - QL-SMC 106 1110 - QL-PROV 108 1111 QL-DNU QL-DUS 110