Symmetricom 1000 User Manual
Chapter 1 Overview of the TimeProvider
Reference Input Signals
Reference Input Signals
38
TimeProvider User’s Guide
097-58001-02 Revision G – April 2008
GPS Inputs
Symmetricom provides a complete GPS antenna system for the TimeProvider. This
includes the Symmetricom GPS Antenna, the TimeProvider Interface Unit (TPIU),
and associated cables. An integrated IMC/TPIU is available for installations where
rack space is at a premium.
includes the Symmetricom GPS Antenna, the TimeProvider Interface Unit (TPIU),
and associated cables. An integrated IMC/TPIU is available for installations where
rack space is at a premium.
illustrates the TPIU, and
illustrates the integrated IMC/TPIU. See
more information on installing the GPS Antenna and the TPIU or IMC/TPIU.
Figure 1-8.
The TimeProvider Interface Unit (TPIU)
Figure 1-9.
The Integrated IMC/TPIU
7
LOS
LOS
Holdover
Holdover
8
LOS
1
INP2
INP2
9
1
1
INP2
INP1
Note:
1
Non-revertive example. Priority Levels set to: INP1 = 3, and INP2 = 3
2
Revertive example. Priority Levels set to: INP1 = 1, and INP2 = 2
Table 1-3. Subtending-Based Reference Selection Scenarios (Continued)
Sequence
QLevel on
INP1
QLevel on
INP2
Active Reference
Non-Revertive
1
Revertive
2