Technical Documentation - 2017-03-06 14:06:38.346697
The scope of this document is to investigate the phase noise and
stability of the WR Switch transceivers. Along with the Digital DMTD
phase detector, they constitute the core of the WR time dissemination
performance. Moreover, the report includes an analysis of the stability
of the Axcen SFPs (commonly used in WR installations).
The stability analysis of the Axcen SFPs resulted in a Modified Allan
Deviation of less than 1E-13 with Tau=1s..10s. The stability is better
than H-Maser clock.
The GTX transceivers have a Modified Allan Deviation of 4E-13/s,
dominated by flicker noise from Tau=0.1s to 100s. The stability of the
GTX transceiver is equal to the stability of the phase detector used by
the WR PLL (DDMTD). Hence, the overall stability of the WR Switch
configured as a boundary clock is equally dominated by the GTX and by
the DDMTD.