Brandywine NTV-100XX, Руководство пользователя

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MANUAL P/N 900000015 REV 1.2
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1 Overview
1.1 Units Without GPS Receiver Option
The Brandywine Communications Network Time Device’s (NTV) purpose is to display time with
accuracy. The Network Time Device uses a Proportional Integral (PI) algorithm to set/synchronize
its clock once and control its internal clocks with a reference. The most used references are NTP
Time Server, Serial Port Input, and GPS (optional). When the Network Time Device connects to
the reference, the Network Time Device will resynchronize its time and internal clocks with the
reference’s time. Using a closed loop control system, the Network Time Device will correct its
clocks based on the time difference between its internal clocks and the reference. A second order
digital phase lock loop (PLL) is used to adjust the internal clocks of the Network Time Device to
match the time of the reference over long time intervals.
1.2 Units With GPS Receiver Option
The Brandywine Communication Network Time Device’s (NTV) purpose is to function as a network
time server for other devices (clients) on a computer network. A built-in GPS receiver receives
precise time signals from orbiting GPS satellites and uses these signals to synchronize the internal
clock of the Network Time Device. Using a closed loop control system, the Network Time Device
will correct its clocks based on the time difference between its internal clocks and the reference. A
second order digital phase lock loop (PLL) is used to adjust the internal clocks of the Network Time
Device to match the time of the reference over long time intervals.