Symmetricom SDU-2000, User Manual

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Hardware Configuration Guide
Configuring a Conventional SSU/TSG System
224 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
Configuring a Conventional SSU/TSG System
The SSU/TSG configuration allows for input of external references to which the
Clock modules are phase locked. This configuration allows for monitoring of several
inputs and for synchronization of output signals.
Figure 9-1 shows a TSG
configuration.
Figure 9-1. Time Sync Generator (TSG) System Configuration
The TSG configuration consists of the following:
SSU-2000 main chassis
Communications Module
One or more E1/DS1 input modules
Corresponding number of Input I/O adapter panels and input I/O cables
One or two Clock Module(s) (2E/3E)
One or more E1 and/or DS1 Output Module(s)
Corresponding number of Output I/O adapter panels and SCSI output cables
Seven 1.0-inch wide filler panels and one 3-1/2” wide filler panel
Configuring a Primary Reference Source (PRS) System
In a Primary Reference Source (PRS) configuration, the SSU-2000 meets the
specifications defined in American National Standards Institute (ANSI)
T1.101-1994. ANSI defines a Primary Reference Source as “equipment that
provides a timing signal whose long-term accuracy is maintained at 1x10
-11
or
better, with verification to Universal Coordinated Time (UTC), and whose timing
signal is 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 other external signals, such as DS1, E1,
composite clock, and various clock frequencies. Time-of-day functionality is
available via the Ethernet port employing NTP.
Figure 9-2 shows a PRS
configuration.