If Interface - Symmetricom TimeSource 3600 User Manual

Chapter 1 Overview of the TimeSource 3600
Functional Description
For structure heights exceeding 45.72 m (150 ft) above earth or above a lower strike
termination device, the zone of protection shall be considered to be the space in the
vertical plane between the points of contact and under the sphere where the sphere
is resting against a vertical surface of the structure and the lower strike termination
device or earth. The zone of protection shall be limited to the space above the
horizontal plane of the lowest terminal unless it can be extended by further analysis,
such as in rolling the sphere to be tangent to earth.
If the wall antenna is installed outside the zone of protection, Symmetricom offers
an outdoor and/or indoor lightning protector kits for these installations. Refer to
Chapter 2, Engineering & Ordering, for more information on these kits.

IF Interface

An IF interface accepts the signals from the antenna/IF converter, and provides the
clock information to the BesTime Ensemble Timing Generator.
GPS Receiver
The GPS Receiver continuously tracks up to eight satellites, using both carrier and
code lock. The recovered pseudo-range measurement data is processed to
determine precise time and frequency state estimates for the local oscillator. The
receiver software is optimized to track and update state estimates, when as few as
one satellite is in view.
Local Oscillator
A rubidium oscillator, based on a digitally controlled servo-loop, provides an
ultra-stable local oscillator signal, which is sent to the BesTime Ensemble Timing
Generator.
Clock Extractors
A clock extractor circuit extracts a timing signal from each external reference
source. (External sources, other than the GPS antenna, are optional.) The extracted
timing signal is sent to the BesTime Ensemble Timing Generator.
Power Supply
A power converter filters and converts
the voltages required by the circuitry.
30 TimeSource 3600 User's Guide
48 volts dc power supplied to the shelf into
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097-72060-01 Revision J – June, 2007