Orolia Spectracom EC20S, Руководство пользователя, Страница: 27 / 110

EPSILON CLOCK MODEL EC20S Spectracom
27
User’s Manual
NOTA: When this synchronization source is not used, it is strongly recommended to disable it (this is
the factory setting) . See 13.7.3 Priority Level: External 1PPS/NMEA.
CAUTION
When this synchronization source is used as a backup
synchronization source
(in conjunction with an external NMEA
datation source 9.3 or not), take care that, at the moment the
EC20S switches from the main GNSS synchronization source to
this synchronization source,
the SFN conditions are lost until
the new synchronization source is ‘ Locked ’. And so the
distribution of the synchronization signals (1PPS, 10 MHz) is
suspended
during this time, when the ‘ Automatic ’ mute mode
is selected. To maintain the distribution of the synchronization
signals during the switch of synchronization sources, the mute
mode shall be set in ‘ Disabled ’ mode. But in this case, the
synchronization signals will be, in any case, subject to a
phase jump
. See 10.3 Synchronization Signals Distribution.