GlobalTime NTP Products
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1.3
Outline
With the rapid development of modern society, higher demand on the time precision and
frequency is put on the agenda. Nowadays with the development of modern digital
communication networks and the information superhighway construction, the political,
cultural, technological and social information coordination is based on a strict system of time
synchronization, especially in the communications, electricity, financial securities, computer
networks, production line operation, administration and national defense and other fields
urgently need the time synchronization equipment.
Global Positioning Satellite (GPS) signals act as the reference source of
GTT-200 network
time server. The time reference contained in the GPS satellite signals synchronizes with the
universal time coordinated (UTC). The long-term frequency stability has achieved the10-13
level of magnitude of cesium atomic clock, which is equivalent to be only 1 second slower
during 30 years. To adjust local time with this reference signal can eliminate the
accumulation of deviation resulted from the low accuracy of local clock time and also can
greatly improve the timing precision of the server.
GTT-200 network time server use the professional GPS timing receiver. It can receive and
lock the satellite signal fast and reliably.
NTP protocol (Network Time Protocol) is a common international network timing protocol. Its
principle is to launch a time polling to the server after an interval of time through the client.
According to a certain filtering algorithm it can calculate the time deviation between the
server and the client as well as the propagation delay caused by network transmission. Then
according to these two parameters to adjust the client's local time and make it consistent
with the server. Compared to other time calibration protocols, NTP protocol can
eliminate
the impact caused by network transmission delay, so it can provide high-precision timing
services. Detailed description can be referred to the latest protocol standards documents
RFC1305 and RFC2030. GTT-200 network time server can be compatible with NTP v2 / v3 /
v4 in various versions.