Symmetricom SSU-2000 User Manual page 43

The module also extracts Synchronization Status Messages (SSM) from incoming
data. For more information, see
and 1-Port and 3-Port DS1 Input
GPS Input Module
The GPS Input module is a one-port card that can only be installed in the SSU-2000
main shelf. The module is used to correct the frequency of the oscillator on the
Clock module. It monitors and reports the status and performance of the module
and radio signals that it receives. See
information.
You must install this module in slot A3 or A5; the antenna connectors J6 and J7 on
the rear panel are connected to these slots, respectively.
Composite Clock Input Module
The Composite Clock Input module conditions a composite clock input signal that is
used to control the frequency of the Clock modules. For more information, see
Composite Clock Input
When the SSU-2000 is in the Subtending mode, the module also produces a 4 kHz
synchronization signal that determines the phase of the composite clock signals
generated by Composite Clock Output modules. This signal ensures that the phase
of the composite clock output signals follows the phase of the composite clock input
reference signal.
Japanese Sine Input Module
The J/SW Input module accepts up to three input signals of either 1.544 MHz or
6.312 MHz and performs phase measurement comparisons (at a sampling rate of
40 Hz) with the Clock modules. The Clock modules use this information to phase
and frequency lock to the incoming signal. The data can also be used for monitoring
the frequency of incoming signals.
For more information on this module, see
page 187.
Japanese Composite Clock Input Module
The J/CC Input module conditions a composite clock input signal that is used to
control the frequency of the Clock modules. For more information, see
Composite Clock Input
If the Input module is provisioned to receive an input with a 400 Hz component and
the 400 Hz is available on the input signal, the JCC4 outputs are aligned to the
400 Hz. When the SSU-2000 is in the Subtending mode, it also produces a 4 kHz
synchronization signal that determines the phase of the composite clock signals
generated by Japanese Composite Clock Output modules. This signal ensures that
the phase of the composite clock output signal follows the phase of the composite
clock input reference signal.
12713020-002-2 Revision F.01 – January 2007
1-Port and 3-Port E1 Input
Modules, on page 170.
GPS Input
Module, on page 184.
Japanese Sine Wave Input
Module, on page 194.
Chapter 1 Product Overview
SSU-2000 Family of Modules
Modules, on page 160,
Module, on page 180, for more
Module, on
Japanese
SSU-2000 User's Guide 43