SyncE

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)

EEC-option 1

EEC-option 2

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 cycles per second. A device that produces frequency is an oscillator.
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 1544 or 2048 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.