SyncE synchronizes clock frequency over an Ethernet port. It does not synchronize time-of-day, that's done by PTP, IEEE 1588.

Setting as oscillator to a frequency is syntonization.

References

ITU-T Rec. G.8261 - Architecture and the wander performance of SyncE networks

ITU-T Rec. G.8262 - Synchronous Ethernet clocks for SyncE

ITU-T Rec. G.8264 - Ethernet Synchronization Messaging Channel (ESMC)

Config Options

ITU-T G.813 Option 1 clock (QL-SEC)

EEC-option 1

ITU-T G.812 type IV clock (QL-ST3)

EEC-option 2

Terms

Synchronous Ethernet and IEEE 1588 in Telecoms

  • Time Interval: Distance between two events, (measured in seconds), milliseconds, microseconds, nanoseconds, picoseconds

  • Frequency: Rate of a repetitive event. Measured in cyles per second. A device that produces frequency is an oscilator.

  • T0: System Clock (line interface output)

  • T1: Timing Reference signal derived from STM-N (STS-N/SyncE) input.

  • T2: Timing Reference signal derived from 2048/1544 kbit input [input from PDH]

  • T3: Timing reference signal derived from 2048 or 2048 1544 with SSM.

  • T4: Clock-interface output.

  • OSC: Internal ST3 oscillator

  • SSM: Synchronization Status Message

  • ESMC: Ethernet Synchronization Message Channel

  • MTIE: Maximum time interval error is a measure of the worst case phase variation of a signal with respect to a perfect signal over a given period of time.

  • TDEV: Time deviation is a statistical analysis of the phase stability of a signal over a given period of time.