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Symmetricom X72 User Manual
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X72 1PPS Algorithm Theory of Operation
90
X72 Desiger
’
s Reference and User
’
s Guide
097-10603-01 Rev
. A – November 2004
Holdover
Figure D-7
X72 Holdover S
tate
During holdover
, 1PPS input st
atistics are
accumulated and pe
riodically the result
s are
calculated (C
alcSlope S
tate).
The sample size is set to 120 data points
(120 seconds).
89
91
Table of Contents
Default Chapter
3
Table of Contents
3
Purpose of this Guide
12
Who Should Read this Guide
12
Structure of this Guide
12
Conventions Used in this Guide
13
Warnings, Cautions, Recommendations, and Notes
14
Related Documents and Information
15
Where to Find Answers to Product and Document Questions
15
What's New in this Guide
15
Chapter 1 Description
17
Overview
18
X72 Rubidium Oscillator
18
Size Difference of X72 (Top) and Vintage FRK Rb Oscillator
18
Typical Applications
19
X72 Rubidium Oscillator Simplified Block Diagram
20
Specifications
21
X72 Dimensions and Connector Pin Assignments
21
X72 Design Absolute Maximum Ratings
22
X72 Design Absolute Maximum Ratings
23
X72 Design Operating Characteristics
24
Total X72 Quiescent Power Dissipation, Typical (Free Convection)
25
Representative X.72 F/F Versus Temperature (Uncompensated)
25
Chapter 2 Design Integration Considerations
27
Mechanical Considerations
28
Mounting Recommendations
28
Recommended Mating Connectors
28
Adapter Cards, Cables, and Options
28
Integrating the X72 into a System
29
Unpopulated Edge Board
29
Standard Edge Board Mounting Example
30
Anchored Edge Board
31
Anchored Edge Board Mounting Example
32
Inch Connector and Header
32
Inch Connector Mounting Example
33
Thermal Considerations
34
Thermal Tape
34
Standard Edge Board
34
Water Condensation and Excessive Humidity
35
Excessive Dust
35
External Interfaces and Grounding
35
Electrical Interface
36
X72 RF Outputs
36
X72 1 PPS Input and Output
36
Lock Signal
36
Service Signal
37
X72 Frequency Control Signal
37
X72 ACMOS Output Frequency
37
Frequency Control Analog
38
Greater than ±1Xe-9 Internal or External Control
38
Time Response of External Frequency Control
38
Temperature Compensation of Frequency
38
Modifiable Unit Settings
39
Hardware Selectable Items
39
Software Selectable Items
39
X72 Susceptibility to Input Noise
40
Input Filtering
40
X72 Reliability and Maintenance
41
Reliability
41
Maintenance
41
Chapter 3 Installation and Operation
43
Installation
44
Site Selection
44
Turn-On Procedure
44
Suggested Connections for X72, Initial Turn-On
44
Start-Up Sequence
45
Sequence of Start-Up Events
46
Theory of Operation
47
X72 Rb Control Loop Block Diagram
47
Troubleshooting
48
Repairs
48
X72 Warranty
49
Appendix A X72 J1 Connector and Plug
51
Molex Connector
52
Molex Connector Plug Assembly
53
Edge Board Pinout
54
Edge Board Pinout Comparison
54
3.25 Inch Interface Cable
55
Inch Interface Cable Connections
55
Edge Board Layout Drawing
56
Layout Drawing for Edge Board
56
Appendix B Symmetricom Serial Interface Protocol
57
Using the Symmetricom Serial Interface Protocol
58
Host Terminal Emulator Setup
58
Data Format
58
Factory Mode
61
Floating Point Number Representation
61
Floating Point Number Representation for SSIP
61
Run Mode Commands
62
Factory Mode Commands
63
Administrative Mode Commands
64
Output Control Status Register Structure
64
Appendix C Using the X72 Developer's Kit
67
Introduction
68
Mounting the X72 Unit
68
Interface Cabling/Circuit Cards
68
Symmetricom Serial Interface Protocol (SSIP)
69
Turn-On Procedure
69
Suggested X72 Test Setup
69
Top View of X72 Case
70
X72 Dimensions
71
Connector J1 Signal Information
71
Start-Up Sequence
72
X72 Development Kit Hardware
73
Test Adapter Board and Edge Adapter Cards
73
Top View of X72 Test Interface Board
73
Developer's Kit (P/N 106495-001) Interconnect Diagram
74
X72 Interface Options
75
Appendix D One Pulse Per Second Source Connection
77
Connection Requirements
78
Background
78
X72 1PPS Functions
79
X72 Time and Frequency Control System
79
System Requirements
80
Test Bench Setup
80
X72 1PPS Algorithm Operation
81
Factory Default
81
Setting the X72 for 1PPS Synchronization
81
Changing the "Y" Coefficients
82
The "Y" Coefficients - Factory Default
82
The "J" Command
83
The "G" Command
83
1PPS States Returned with the J Command
83
1PPS Firmware Versions
84
Flywheeling Recovery - Normal
85
Flywheeling Recover with 1PPS Offset < 1Μsec
85
Flywheeling Recover with 1PPS Offset > 1Μsec
86
Recovery with Jamsynch
86
X72 1PPS Algorithm Theory of Operation
87
X72 1PPS Algorithm High Level Flow Chart
88
X72 1PPS Algorithm States
88
Initialization
89
X72 Initialize State
89
Holdover
90
X72 Holdover State
90
Calcslope
91
Jamsynch
92
Discipline
93
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Symmetricom X72 Specifications
General
Brand
Symmetricom
Model
X72
Category
Test Equipment
Language
English
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