Chapter 1 Product Overview
Typical System Configurations
22 SSU-2000e User’s Guide 12713140-002-2 Revision E – October 2006
Timing Signal Generator (TSG) Configuration
The Timing Signal Generator (TSG) configuration shown in Figure 1-2 allows for
input of external references to which the Clock modules are phase and frequency
locked. This configuration allows for monitoring of several inputs, and for
synchronization of output signals.
Figure 1-2. SSU-2000e in TSG Configuration
Primary Reference Source (PRS) Configuration
In a Primary Reference Source (PRS) configuration (Figure 1-3), the SSU-2000e
meets the specifications defined for ETSI Type II Transit Node Clocks in American
National Standards Institute (ANSI) T1.101-1999. ANSI defines a Primary
Reference Source as “equipment that provides a timing signal whose long term
accuracy is maintained at 1 x 10
-11
or better, with verification to Universal
Coordinated Time (UTC), and whose timing signal may be used as the basis of
reference for the control of other clocks within a network”. If standard Input modules
are installed in the remaining input slots, this configuration also allows for
monitoring of up to 24 external signals, such as DS1, E1, Composite Clock, and
various clock frequencies. Time-of-day functionality is available through an Ethernet
port employing NTP.
Figure 1-3. SSU-2000e Configured as a Primary Reference Source
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