Title: Timing characteristics of a synchronous equipment slave clocks

On this page:

Summary

• Synchronous Equipment Clock performance specification, covering both synchronous Ethernet Equipment clocks (EEC) and synchronous OTN Equipment Clocks (OEC)

• Identical in performance to the SDH Equipment Clock specification defined in G.813

• Specifies frequency accuracy, noise generation, noise tolerance, noise transfer, phase transients

• Operates over most Ethernet interfaces from 100Mbit/s to 100Gbit/s

Status

• Current version: 4th. Edition, November 2018

• Download from: http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=13766

Key Contents

• Frequency accuracy (free-run): 4.6 ppm

• Wander Generation (Figures 1 and 2):

Open

• Wander Tolerance (Figure 5):

Open

• Wander transfer: Low pass filter,

  • EEC Option 1 (Europe): 1 to 10 Hz

  • EEC Option 2 (N. America): max. 0.1 Hz

• Jitter Generation (Table 6):

• Jitter Tolerance (Figure 9):

Open

• Holdover (Figure 13):

Open