Symmetricom SDU-2000, User Manual

Page: 165 / 470

12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 165
Input Module Reference Data
Composite Clock Input Module
Configuration Data
The configuration settings for the GPS Input module are listed in Table 7-10 .
Composite Clock Input Module
This section provides operating instructions and software provisioning procedures
for the Composite Clock Input module (part number 23413279-000-0), designed for
use in the SSU-2000 Synchronization Supply Unit.
Functional Overview
The Composite Clock Input module conditions a composite clock input signal that is
used to control the frequency of the Clock modules. When the SSU-2000 is in the
Subtending mode, it also produces a 4 kHz synchronization signal, which
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. The module
consists of a micro-controller and firmware, SRAM for data storage, FLASH memory
that contains the firmware, and other support circuitry.
Table 7-10. GPS Input Module Configuration Settings
Configuration Setting Factory Default Range
Position (GPS only)
Latitude
Longitude
Altitude
Averages
PDOP
Pos Mode 0
0
0
300
0
Calc ± 90 degrees
±180 degrees
–60 to 4000 meters
10 to 3600
1 to 10
User/Calc
Min Elevation for position 5 0 to 50 degrees
Min PDOP for position 3 1 to 10
Min Elevation for timing 10 0 to 50 degrees
Module Status Enabled Enabled/Disabled
Priority 0 0 to 10
Sigma limit 25 10 to 1000
µ
S
PQL 2 1 to 16
Disabled SV list None Up to 31 SV numbers
Min PDOP for position 3 1 to 10