Huahuan Electronics HX.PTP-GM02, Руководство пользователя

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Beijing Huahuan Electronics Co., Ltd
AC/IN 100
～
240V
PoE
P+D/OUT
Data/IN
PWR
Figure 3-5 Front and rear panel of the PoE adaptor
3.3. Functional Descriptions
3.3.1. Time Synchronization
Anywhere on the surface of our globe, GeckoSynco can adjust its
internal clock to the international standard time of TAI and UTC, by locking
to satellite signals from GPS or other GNSS systems. The phase error is kept
within 100ns from TAI/UTC, provided good reception conditions from the
satellites. In principle, at least 4 satellites must be within its line of sight to
resolve the four variables of the 3D position of latitude, longitude, and
elevation from the sea level, as well as time. The more satellites in the line of
sight, the more accurate these 4 variables can be calculated. That’s why
installation of the receiver antenna prefers as much sky view clearance as
possible. Most systems require outdoor antenna on top of the buildings.
The GeckoSynco is designed with Peek2Sync technology. It only needs
to be mounted indoors on a window with a reasonable sky view to achieve
high precision time acquisition. Mostly used as a non-mobile device
Note2
, best
performance can be reached with ‘Fixed’ time mode (see Figure 6-4),
provided that the precise 3D coordinates are known in advance, leaving only
one variable of time to be calculated. With ‘Fixed’ mode, line of sight of
down to 1 satellite can provide good synchronization. If precise 3D
coordinates are not known, the GeckoSynco should be put in ‘3D Search’
mode, and given enough time, from 24 hours to 72 hours, the device will
HX.PTP-GM02 IEEE-1588 Grandmaster Clock V1.0 15