Title: Timing characteristics of a synchronous equipment slave clocks
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):
- Wander Tolerance (Figure 5):
- 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):
| Interface | Measuring Filter | Peak-to-Peak amplitude (UI) |
|---|---|---|
| 1G | 2.5kHz to 10MHz | 0.50 |
| 10G | 20kHz to 80MHz | 0.50 |
| 25G | 20kHz to 200MHz | 1.2 |
- Jitter Tolerance (Figure 9):
- Holdover (Figure 13):
