NetClock/GTP Instruction Manual
Page 1-1
GENERAL INFORMATION
1.0 INTRODUCTION
The Spectracom NetClock/GTP Master Clock, shown in Figure 1-1, is a precise,
traceable Global Time Provider. The NetClock/GTP receives and recovers time
information from the
G
lobal
P
ositioning
S
ystem (GPS) constellation of satellites.
The GPS constellation consists of 24 satellites placed in 6 orbital planes spaced
equally around the equator and inclined at a 55-degree angle. This design
assures reliable worldwide coverage 24 hours a day. Each satellite contains a
redundant system of highly accurate and stable atomic clock sources. The
satellite’s timing, orbital position and other system parameters are monitored and
controlled by ground stations maintained by the US Department of Defense and
US Naval Observatory.
The NetClock/GTP Master Clock provides timing outputs accurate to within 100
microseconds of UTC. Standard Master Clock outputs include RS-232,
RS-485, FAA Modified IRIG B and a one pulse per second. The NetClock/GTP
is ideally suited as a Master Clock in all applications requiring an accurate and
traceable time source. Typical applications include computer network timing,
utility billing, financial transactions, public safety and transportation.
FIGURE 1-1 NETCLOCK/GTP MASTER CLOCK
