Chapter 6 Clock Module Reference Data
Stratum 3E Clock Module
146 SSU-2000e User’s Guide 12713140-002-2 Revision E – October 2006
Configuration Data
Table 6-3 contains a listing of software configuration options and factory defaults for
the Stratum 2E Clock module
.
Stratum 3E Clock Module
This section provides user reference information for the Stratum 3E Clock module
(part number 23413015-000-0 used in the SSU-2000e. This module provides a
lower cost backup clock solution for the system.
Functional Overview
The Stratum 3E Clock module meets or exceeds the performance requirements for
ITU and ETSI Type III Local Node clocks and ANSI and Telcordia Technologies
(Bellcore) Stratum 3E clocks.
The Stratum 3E Clock module receives measurement data from the Input modules,
provides frequency control of the outputs through DDS circuitry, and generates a
reference signal for use by the Input and Output modules. The Stratum 3E Clock
module communicates with the Communications module and the Stratum 2E Clock
module to maintain phase synchronization with the redundant Clock module. The
Stratum 3E Clock module’s hardware and software provides for temperature
compensation, aging compensation for the Quartz oscillator, an initial offset
adjustment, and frequency adjustment resolution of 1 x 10E
-13
or better.
Table 6-3. Stratum 2E Clock Module Options/Defaults
Setting Default Range
Warmup Time 1200 seconds 900 to 3600 seconds
Min Tau Limit 300 seconds Constant
Max Tau Limit 10000 seconds Constant
Min Tau 300 seconds In the range specified in Min/Max Tau limits
Max Tau 9000 seconds In the range specified in Min/Max Tau limits
Clk Switch AR On On/Off
Input Switch AutoReturn (AR) AR (2)/AS On (1)/AS Off (0)
Input Selection Mode Priority Priority (0)/PQL (1)
Local Oscillator (LO) On On/Off
Frequency Offset 57 ppb Constant
Elevation Time 86400 seconds 60 to 500,000 seconds
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