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Symmetricom X72 User Manual

Symmetricom X72
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097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide 7
Figures
1-1 X72 Rubidium Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
1-2 Size Difference of X72 (top) and Vintage FRK Rb Oscillator. . . . . . . . . . . .18
1-3 X72 Rubidium oscillator simplified block diagram . . . . . . . . . . . . . . . . . . . .20
1-4 X72 Dimensions and Connector Pin Assignments . . . . . . . . . . . . . . . . . . .21
1-5 Total X72 Quiescent Power Dissipation, Typical (free convection) . . . . . . .25
1-6 Representative X.72 f/f versus Temperature (uncompensated). . . . . . . . . .25
2-1 Adapter Cards, Cables, and Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
2-2 Unpopulated Edge Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
2-3 Standard Edge Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
2-4 Standard Edge Board Mounting Example . . . . . . . . . . . . . . . . . . . . . . . . . .30
2-5 Anchored Edge Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
2-6 Anchored Edge Board Mounting Example. . . . . . . . . . . . . . . . . . . . . . . . . .32
2-7 3.25-Inch Connector and Header. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
2-8 3.25-Inch Connector Mounting Example . . . . . . . . . . . . . . . . . . . . . . . . . . .33
2-9 Standard Edge Board and LPRO Connector . . . . . . . . . . . . . . . . . . . . . . . .34
3-1 Suggested Connections for X72, Initial Turn-on. . . . . . . . . . . . . . . . . . . . . .44
3-2 Sequence of Start-up Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
3-3 X72 Rb Control Loop Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
A-1 Molex Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
A-2 Molex Connector Plug Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
A-3 Edge Board Pinout Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
A-4 3.25 Inch Interface Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
A-5 Layout Drawing for Edge Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
C-1 Suggested X72 Test Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
C-2 Top View of X72 Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
C-3 X72 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
C-4 Top View of X72 Test Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
C-5 Developers Kit (P/N 106495-001) Interconnect Diagram . . . . . . . . . . . . . .74
C-6 X72 Interface Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
D-1 X72 Time and Frequency Control System . . . . . . . . . . . . . . . . . . . . . . . . . .79
D-2 Test Bench setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
D-3 Flywheeling Recover with 1PPS offset < 1µsec . . . . . . . . . . . . . . . . . . . . .85
D-4 Flywheeling Recover with 1PPS offset > 1µsec . . . . . . . . . . . . . . . . . . . . .86
D-5 X72 1PPS Algorithm States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
D-6 X72 Initialize State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
D-7 X72 Holdover State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

Table of Contents

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Symmetricom X72 Specifications

General IconGeneral
BrandSymmetricom
ModelX72
CategoryTest Equipment
LanguageEnglish

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