Chapter 6 Clock Module Reference Data
Type I Clock Module
150 SSU-2000e User’s Guide 12713140-002-2 Revision E – October 2006
Configuration Data
The Stratum 3E Clock module is software configurable through one of the serial or
Ethernet ports. The default values and the ranges for the configurable parameters
are listed in Table 6-6.
Type I Clock Module
This section provides operating instructions and software provisioning procedures
for the Type I Clock module (part number 23413015-001-0), designed for use in the
SSU-2000e Synchronization Supply Unit.
Functional Overview
The Type I Clock module uses a quartz oscillator which meets or exceeds the
performance requirements for ITU and ETSI Type I Slave clocks. The Clock module
reads measurement data from the Input modules, provides frequency control of the
oscillator through DDS circuitry, and generates reference signals used by the Input
and Output modules.
A typical SSU-2000e shelf contains dual redundant Clock modules. Each Clock
module maintains phase synchronization with the redundant Clock module. Its
hardware and software also provides an initial offset adjustment and frequency
adjustment resolution of 1 x 10
-13
or better.
Table 6-6. Stratum 3E Clock Default Values and Ranges
Setting Default Range
Warmup Time 1200 seconds 900-3600 seconds
Min Tau Limit 300 seconds Constant
Max Tau Limit 500 seconds Constant
Min Tau 300 seconds In the range specified in Min/Max Tau limits
Max Tau 450 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
To Next Page
Loading...
Need help?
General
