Symmetricom TimeSource 3600, Manual

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TimeSource 3600
S S S S S S S S S S S S S S S S S S S S S S S S S S S S S
Overview
The TimeSource 3600 is a Primary Reference Source (PRS) that
receives and processes signals from GPS satellites, and outputs
Stratum 1 synchronization signals traceable to UTC. TimeSource
3600 applications include synchronization for central offices,
wireless base stations, transmission nodes, and other cases where
a primary reference source can improve the performance of a
telecommunications network infrastructure.
The TimeSource 3600 is also ideal for installation in environments
where receiving GPS signals is difficult. Examples of environments
hostile to GPS signals include urban canyons which have a very
limited view of the sky because of blockage from nearby buildings,
and high interference zones where GPS signals are jammed by
competing over-the-air signals.
The TimeSource 3600 creates timing outputs by ensembling
signals from several sources. The sources include GPS signals, an
onboard rubidium local oscillator, and optional E1 or analog.
Timing outputs created from the ensemble are composed of the
most stable and least noisy parts of each input. The performance
of the E1 sources can be monitored and classified using standard
measures. Synchronization outputs are delivered in a framed, all-
ones, E1 format or 2.048 MHz analog signal, a 10 MHz signal, a 1
pps signal, and a choice of time of day (TOD) formats.
The TimeSource 3600 minimizes timing impairments, such as
jitter and wander, that are created by network and transmission
systems. The synchronization timing is traceable to the GPS,
which provides the highest level of synchronization for telephony
networks. The TimeSource 3600 with its GPS input is a stand-
alone office PRS. With the optional inputs ensembled, holdover is
extended if GPS signals are disrupted.