Command Line
Glossary
Command Line 195
GPS 195
Hardware Clock 196
Input References 196
Leap Indicator 197
NTP Associations 197
NTP Daemon 198
NTP Packet 198
PING 201
PTP (Precision Time Protocol 202
Stratum 202
Synchronizing NTP association 202
UTC 202
Operational Configuration 203
Command Line
The command line is a text-based user interface available on most operating systems. For
example, on Microsoft Windows, open the Start menu, select Run, and enter cmd.
The SyncServer has a very limited command line interface, available from the RS-232 con-
sole port located on the front panel, and also by opening a TELNET session to the LAN1 net-
work port (TELNET must be enabled on the SERVICES - . Consult the Command Line
Interface (on page 107) for more detail.
GPS
Introduction
The Global Positioning System (GPS)
1
is a worldwide radio-navigation system formed from
a constellation of at least 24 satellites that continuously orbit the earth. Most GPS satellites
have several atomic clocks that are precisely synchronized to UTC from the U.S. Naval
Observatory (USNO). Coded signals are broadcast by each of the satellites with the exact
time and position of the satellite. All GPS receivers use an antenna to receive these signals.
Using a GPS receiver optimized for time (rather than position), it is possible to get extremely
precise synchronization with the satellites' atomic clocks.
GPS Time and Date
From Wikipedia: "While most clocks are synchronized to Coordinated Universal Time
(UTC), the Atomic clocks on the satellites are set to GPS time. The difference is that GPS
time is not corrected to match the rotation of the Earth, so it does not contain leap seconds or
997-01520-02 Rev. F1.......................................................................... Page 195
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