Huahuan Electronics HX.PTP-GM02, Руководство пользователя

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Beijing Huahuan Electronics Co., Ltd
determine its 3D position by averaging algorithm. Once the position data is
within preset accuracy, the device should be set to ‘Fixed’ mode for better
timing performance.
Note: The time mode is stored in non-volatile memory not affected by power
off. If the device is moved to a new location, 3D data must be updated either
manually or through 3D search. Only a few meters difference will degrade the
timing accuracy. If position is far off, the ‘Fixed’ mode may prevent the
device from locking to the satellite.
When the SYS LED turns green, indicating accurate locking to the GNSS
clock, the device is ready to serve as a PTP grandmaster, a 1PPS+ToD timing
reference, or a NTP server. A new installation would take up to 15 minutes or
longer to receive all the necessary information from the GNSS, while re-
powering of a previously locked stationary device locks much faster since
most of the necessary data are kept in the non-volatile memory during the
previous operation.
When locked to the satellite system, if by any reason the satellite signals
are blocked or interfered, the GeckoSynco will enter holdover mode, the SYS
LED turns red and blinks. An internal high quality OCXO aided by the
temperature compensation algorithm in the software keeps the holdover
frequency stability within 1ppb for more than 72 hours. If the satellite signal
fails before time synchronization is achieved, the SYS LED will be steadily
red, and the device should not be used as a timing source.
Note
2
: If mounted on a mobile platform, the <100ns accuracy may be
compromised.
3.3.2. Synchronous Ethernet (SyncE)
Synchronous Ethernet (SyncE) provides frequency reference at the
physical level of the Ethernet signal.
Device supports two SyncE modes:
16 HX.PTP-GM02 IEEE-1588 Grandmaster Clock V1.0