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Summary of Contents for Symmetricom X72
- Page 1 X72 Rubidium Oscillator Designer’s Reference and User Guide Revision A – November 2004 Part Number 097-10603-01...
- Page 2 2300 Orchard Parkway San Jose, CA 95131-1017 U.S.A. http://www.symmetricom.com Copyright © 1999 – 2004 Symmetricom, Inc. All rights reserved. Printed in U.S.A. All product names, service marks, trademarks, and registered trademarks used in this document are the property of their respective owners.
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Page 3: Table Of Contents
X72 1 PPS Input and Output ........36... - Page 4 X72 Susceptibility to Input Noise........40...
- Page 5 X72 Development Kit Hardware ........73...
- Page 6 X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
- Page 7 Suggested X72 Test Setup........69...
- Page 8 X72 Calcslope State........
- Page 9 Tables X72 Design Absolute Maximum Ratings ......22 X72 Design Absolute Maximum Ratings ......23 X72 Design Operating Characteristics.
- Page 10 X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
- Page 11 Conventions Used in This Guide Warnings, Cautions, Recommendations, and Notes Related Documents and Information Where to Find Answers to Product and Document Questions What’s New In This Guide 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide...
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Page 12: Purpose Of This Guide
This material consists of a brief description of X72 design supported by block diagrams, description of environmental issues, installation guidelines, required mating connectors, and unit operation. -
Page 13: Conventions Used In This Guide
This appendix describes use of the external communications link Serial Interface Protocol software. Appendix C, Using the X72 This appendix describes the X72 developer’s kit hardware. Developer’s Kit Index Provides references to individual topics within this guide. Conventions Used in This Guide This guide uses the following conventions: Acronyms and Abbreviations –... -
Page 14: Warnings, Cautions, Recommendations, And Notes
Note: All notes use this symbol. Notes contain installation, operation, or maintenance procedures, practices, conditions, or statements, that alert you to important information, which may make your task easier or increase your understanding. X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 15: Related Documents And Information
Related Documents and Information Related Documents and Information See your Symmetricom representative or sales office for a complete list of available documentation. Note: Symmetricom offers training courses designed to enhance your knowledge of the X72 Rubidium Oscillator. Contact your local representative or sales office for a complete list of courses and outlines. - Page 16 What’s New In This Guide X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
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Page 17: Chapter 1 Description
Description Chapter 1 Description This section contains a description of the X72 and lists its typical applications. It provides information on dimensions, performance, and connector pinouts. In This Chapter Overview Typical Applications Specifications 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... -
Page 18: Overview
Figure 1-1 X72 Rubidium Oscillator Drawing on over 30 years of experience, the X72 design has been refined for low cost mass production and can be easily integrated into time, frequency and synchronization systems, requiring only one input supply voltage. It can be mounted directly onto a circuit board as a component of a module used in 0.8 inch wide card... -
Page 19: Typical Applications
Typical Applications Typical Applications The elevated operating temperature range of the X72 sets a new high-point for this type of atomic reference. Compared with traditional quartz oscillators, the stability of the X72 allows it to maintain excellent frequency control even when the operating temperature goes above 85°... -
Page 20: X72 Rubidium Oscillator Simplified Block Diagram
Description Typical Applications For simple applications the X72 provides a 5V CMOS-compatible Built-in Self Test (BIST) Service and a LOCK alarm signal derived from the basic physics operation. This lock signal indicates when the output frequency is locked to the atomic resonance of rubidium. -
Page 21: Specifications
Specifications Figure 1-4 X72 Dimensions and Connector Pin Assignments Caution: To avoid damage to the X72, ensure that power and ground are properly connected. This unit has an internal fuse but has no reverse polarity protection. Note: All pins on the MOLEX connector must be connected. -
Page 22: X72 Design Absolute Maximum Ratings
Description Specifications Table 1-1. X72 Design Absolute Maximum Ratings Signal Name Signal Function Type Number 1 – 7 + Power input +10 to +32 Vdc – all power pins must be connected. SERVICE Output Indicates unit is nearing limits of frequency control and that Service is required within several months. -
Page 23: X72 Design Absolute Maximum Ratings
Description Specifications Table 1-2. X72 Design Absolute Maximum Ratings Characteristic – 40° C to 85° C Symbol Units Base-plate (Unit in ambient still air – convection) Supply relative to ground 10 to 32 volt unit – 0.25 to 40 Input voltage relative to DIN &... -
Page 24: X72 Design Operating Characteristics
Description Specifications Table 1-3. X72 Design Operating Characteristics – 40° C to 85° C Characteristic Base-plate Symbol Units (Unit in ambient still air – convection) Digital Inputs/Outputs Supply relative to 10 to 32 volt unit ground High level input voltage... -
Page 25: Total X72 Quiescent Power Dissipation, Typical (Free Convection)
To be added when available Base plate Temperature (° C) Figure 1-6 Representative X.72 f/f versus Temperature (uncompensated) Note: Refer to the X72 Performance Characteristics document for more detailed information. 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... - Page 26 Description Specifications X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
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Page 27: Chapter 2 Design Integration Considerations
In This Chapter Mechanical Considerations Thermal Considerations External Interfaces and Grounding Electrical Interface Frequency Control Analog Modifiable Unit Settings X72 Susceptibility to Input Noise X72 Reliability and Maintenance 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... -
Page 28: Mechanical Considerations
Mechanical Considerations Mounting Recommendations To mount the X72 to a circuit card or chassis, use the four mounting holes located at the corners of its base plate. An interface cable or adapter card is required to access the X72 outputs and to interface with a host system. -
Page 29: Integrating The X72 Into A System
From the various interface points on the Edge Board a system designer can access all inputs and outputs of the X72 and can mount the connectors that are necessary for their application. This provides a variety of connection schemes. The examples included in this document are just a few of the integration methods possible with these edge boards. -
Page 30: Standard Edge Board Mounting Example
15 µF capacitor Pad for coaxial connector for sine output Soldered 2 x 8 pin connector Adapter for connection to PCB Figure 2-4 Standard Edge Board Mounting Example X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 31: Anchored Edge Board
The Anchored Edge Board includes the following: 390 pf capacitor 10 Ω resistor 15 µF capacitor Pad for coaxial connector for sine output Unpopulated 16 pin header strip for customer integration. 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... -
Page 32: Anchored Edge Board Mounting Example
The 3.25 inch connector (PN 060031-001) is an all-in-one connection option that includes the mating connector to the X72 and a 24-pin header that can be mounted directly on a system board. The flexible cabling allows the header to be installed in various orientations to the unit. -
Page 33: Inch Connector Mounting Example
The X72-LPRO Adapter allows these customers to upgrade to the X72 without changing the physical interface in their unit. The Standard Edge Board and the LPRO Compatible Option Board both have sockets to install and solder a 2 x 8 pin connector between the two boards. -
Page 34: Thermal Considerations
If there is air flow over the unit's top cover, the X72's maximum operating base plate temperature increases by 1 or 2° C and its power consumption at a given base plate temperature also increases by a few tens of milliwatts. -
Page 35: Water Condensation And Excessive Humidity
Condensation will not cause a problem for environments meeting the X72 specification if the X72 base plate thermal ramp rates are controlled so that they rise at less than 2° C/minute. Excessive Dust Operating the unit in dusty conditions may cause unexpected thermal effects if dust builds up on the top surface. -
Page 36: Electrical Interface
X72 RF Outputs RF Output Impedance versus Frequency The active rf output impedance for the X72 is a nominal 50 Ω at 10 MHz, but is a widely varying impedance at other frequencies. you must take this into consideration if the X72 rf output is driving a non-buffered filter. Note that the X72 is specified as delivering 0.5 Vrms (typical) into a 50 Ω... -
Page 37: Service Signal
Design Integration Considerations Electrical Interface If the LOCK signal is high, atomic lock has been lost and the X72 goes into sweep mode to reacquire lock. The sweep ranges from approximately –21 ppm to +21 ppm in approximately a 20 second period. During the sweep, outputs are maintained but you should not rely on signal accuracy during sweeping. -
Page 38: Frequency Control Analog
J-11, the voltage will self bias to mid-range, or 2.5V. This input can also be turned off via the SSIP to eliminate any source of noise. In some versions of the X72, this function can be turned off by customer request on power up. If it is to be used later it... -
Page 39: Modifiable Unit Settings
Modifiable Unit Settings Modifiable Unit Settings You can modify some features of the X72 operation are modifiable by the customer. Refer to the X72 Developer’s Kit document (DK/106031) for information on how to use the SSIP to use these functions. -
Page 40: X72 Susceptibility To Input Noise
If you have an application where the output spectrum phase noise and spur integrity is crucial, the X72 must have a comparatively clean source of dc power (free of spurious current or voltage noise). Connecting fans, heaters, and other switching devices to the dc supply powering the X72 can result in degraded phase noise and spur performance. -
Page 41: X72 Reliability And Maintenance
X72 Reliability and Maintenance Reliability The X72 is designed with a goal of twenty years of operation without retuning. To accomplish this, the major mechanisms impacting the need for maintenance were addressed. Thus, each X72 has been designed to have excess rubidium fill in the lamp to last for the required period, sufficient pulling range for the voltage controlled crystal oscillator, and sufficient dynamic range of the rubidium control loop. - Page 42 Design Integration Considerations X72 Reliability and Maintenance X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
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Page 43: Chapter 3 Installation And Operation
Installation and Operation Chapter 3 Installation and Operation This section provides information on details to consider when installing the X72 and the procedure to follow when turning on the unit. There is an explanation of the start-up sequence, monitoring performance, and theory of operation. It also contains a troubleshooting guide, customer support information, and warranty information. -
Page 44: Installation
X72, ensure that the temperature limits are not exceeded. The X72 is sensitive to external dc and ac magnetic fields (refer to specification) and should not be installed in locations subjected to strong magnetic fields from transformers or large power supplies. -
Page 45: Start-Up Sequence
Installation and Operation Start-up Sequence Once the X72 is plugged in and is receiving power, wait 3 to 4 minutes while the unit achieves atomic lock. During this period, the monitored LOCK signal should be HIGH. Once the unit achieves atomic lock, the LOCK signal goes LOW. -
Page 46: Sequence Of Start-Up Events
Installation and Operation Start-up Sequence Figure 3-2 Sequence of Start-up Events Note: The Service signal can be Active High or Active Low depending on the unit configuration. X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 47: Theory Of Operation
Installation and Operation Theory of Operation Theory of Operation The Model X72 makes use of the atomic resonance property of rubidium ( Rb) to control the frequency of a quartz crystal oscillator via a frequency-locked loop (FLL). The FLL function block is shown in Figure 3-3. -
Page 48: Troubleshooting
Is the ambient temperature below –40° C or above +85° C (the unit will not startup properly in excessively cold or hot temperatures) Repairs The X72 is not field repairable, but some firmware upgrades can be done in the field, as noted in Start-up Sequence, on page 45. -
Page 49: X72 Warranty
Repairs X72 Warranty Symmetricom warrants the X72 electronics for one year, and the Rb lamp bulb and resonator cell for 20 years. Symmetricom also warrants that at the time of shipment the X72 will be free from defects in materials furnished and workmanship performed by Symmetricom. - Page 50 Installation and Operation Repairs X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
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Page 51: Appendix A X72 J1 Connector And Plug
Appendix A X72 J1 Connector and Plug This appendix provides information on the Molex connector and plug, the edge board pinout and layout, and the 3.25 inch interface cable. In This Appendix Molex Connector Molex Connector Plug Assembly Edge Board Pinout 3.25 Inch Interface Cable... -
Page 52: Molex Connector
Molex Connector Molex Connector Figure A-1 Molex Connector X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 53: Molex Connector Plug Assembly
Molex Connector Plug Assembly Molex Connector Plug Assembly Figure A-2 Molex Connector Plug Assembly 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... -
Page 54: Edge Board Pinout
Edge Board Pinout Edge Board Pinout Figure A-3 Edge Board Pinout Comparison X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 55: 3.25 Inch Interface Cable
3.25 Inch Interface Cable 3.25 Inch Interface Cable Figure A-4 3.25 Inch Interface Cable Connections 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... -
Page 56: Edge Board Layout Drawing
Edge Board Layout Drawing Edge Board Layout Drawing Figure A-5 Layout Drawing for Edge Board X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 57: Appendix B Symmetricom Serial Interface Protocol
Appendix B Symmetricom Serial Interface Protocol This appendix provides information on communicating with the X72 through serial port J1. It includes output examples and a description of commands. In This Appendix Using the Symmetricom Serial Interface Protocol 097-10603-01 Rev. A – November 2004... -
Page 58: Using The Symmetricom Serial Interface Protocol
Using the Symmetricom Serial Interface Protocol The Symmetricom Serial Interface Protocol (SSIP) permits external communication with the X72 through the serial port connector J1 when the unit is connected to a host PC. All “developer-mode” commands are a single ASCII letter and require no termination. - Page 59 Using the Symmetricom Serial Interface Protocol The following is an example of output from the X72 after power is applied to the unit. X72 by Symmetricom, Inc., Copyright 2001 SDCP Version 3.75 of 3/2001; Loader Version 2 Mode CNN1 Flag 0004 [822F]ok Unit serial code is 0009AB001B-h, current tuning state is 6 Crystal: 60000000hz, ACMOS: 10000000.0hz, Sine: 10000000.0hz...
- Page 60 Using the Symmetricom Serial Interface Protocol The following print out shows the response to the command for “w” for X72 “Health Data” (wellness): r>w AData: SCont: 6012 SerNum: 18C PwrHrs: 18A PwrTicks: 11A6848 LHHrs: 17E LHTicks: 83DBD0 RHHrs: 17E RHTicks: 83D2E3...
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Page 61: Factory Mode
Using the Symmetricom Serial Interface Protocol Factory Mode Data output from the X72 in factory mode is not intended for users outside the factory and is not described in this document beyond Table B-1. Caution: Using factory mode can result in the erasure of firmware on the X72 rendering it inoperable and making it necessary to return the unit to the factory for re-programming. -
Page 62: Run Mode Commands
The serial interface is initialized as follows: Table B-2 defines the X72’s Run Mode Commands. Table B-3 defines the bit functions of the factory mode commands of the X72. Table B-4 defines the administrative mode commands. Table B-5 defines the bit functions and controlling agent of the output control register of the X72. -
Page 63: Factory Mode Commands
(enabled) Note: This mode and ADMIN mode allow the loading of new code or updates, or reconfiguring defaults in the field. It is not a normal operating mode. 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... -
Page 64: Administrative Mode Commands
Default is set at Factory per Configuration file Enable Output that matches customer's selection – Host can alter during operation, but host cannot 1 = Disables 1PPS alter the default power up condition. Output X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... - Page 65 11-15 Reserved – Not Used. * user cannot set Note: When altering the Control Register these bits are masked out by firmware, the Host will consider these bits as "DON'T CARE". 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide...
- Page 66 Using the Symmetricom Serial Interface Protocol X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
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Page 67: Appendix C Using The X72 Developer's Kit
Appendix C Using the X72 Developer’s Kit This appendix provides information on using the Symmetricom Serial Interface protocol (SSIP) and includes signal information for connector J1. It also provides a developer interconnect diagram and an interface options diagram. In This Appendix... -
Page 68: Introduction
X72 product in various applications and determine how to implement it in the most advantageous manner. The developer’s kit contains a hardcopy of this document, the X72 unit, a 3 foot (0.914 M) interface cable, the adapter board assembly, application notes, and a CD with electronic files documenting the specifications and performance of the unit. -
Page 69: Symmetricom Serial Interface Protocol (Ssip)
The X72 unit included in the kit is configured at the factory to operate at 10 to 32 Vdc. If the X72 is used without the adapter board a 50 Ω load is required and a 390 pf filter capacitor is recommended to prevent spurs. Additional information on power... -
Page 70: Top View Of X72 Case
1xE of center frequency. Thirty minutes after applying power to the X72 the rf output frequency will be very close to full accuracy (refer to X72 specifications). Note: The output frequency of the X72 is more accurate than most counters. -
Page 71: X72 Dimensions
VSS (bundled) – Power & signal return 1 PPS IN Input 1 PPS input, positive edge triggered 1 PPS OUT Output 1 PPS output, may be enabled/disabled digitally 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... -
Page 72: Start-Up Sequence
After 7.5 minutes the accuracy of the X72 oscillator will be at <1xE Aging and temperature coefficient performance of the X72 unit will vary according to the application profile specified by the customer at time of order. Refer to the X72 product specification for information on application profiles and unit performance. -
Page 73: X72 Development Kit Hardware
Note: 10 to 32 Vdc is the recommended method of operation. To use the SSIP firmware of the X72, connect the serial port of the interface test board to a host PC com port (this cable is supplied by the customer). Refer to... -
Page 74: Developer's Kit (P/N 106495-001) Interconnect Diagram
X72 Development Kit Hardware Figure C-5 Developer’s Kit (P/N 106495-001) Interconnect Diagram X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 75: X72 Interface Options
X72 Development Kit Hardware Figure C-6 X72 Interface Options 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide... - Page 76 X72 Development Kit Hardware X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
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Page 77: Appendix D One Pulse Per Second Source Connection
Appendix D One Pulse Per Second Source Connection This appendix describes how to connect a one pulse per second (1PPS ) source, such as a commercial GPS receiver, to an X72 to achieve long term accuracy and excellent holdover, or flywheeling performance. -
Page 78: Connection Requirements
GPS 1PPS system to steer various oscillators (Cesium, Rubidium, and Quartz). These products make it possible to combine the short term with long term stability. Now, with X72, the solution can be even more cost effective. When used with a GPS receiver the X72 provides telecommunications system performance levels that rival levels obtained using Cesium oscillators. -
Page 79: X72 1Pps Functions
The “j” command displays the difference between the 1PPS input and the 1PPS generated internally by the X72. The “j” command produces a number representing the number of TICS in a delta register. If the X72 has a 60 MHz crystal, each TIC is –8 16.7 ns (1.67 x E... -
Page 80: System Requirements
– Maximum DC undershoot must be limited to –0.5V or 10mA, whichever is easiest to achieve. – Minimum pulse width (or hold time) of 50 ns. X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 81: X72 1Pps Algorithm Operation
– Input impedance is >100K Ω allowing the user to terminate the 1PPS at the input to the X72 with 50 Ω at the X72 input pin or drive the X72 high impedance directly with a low impedance source such as 50 Ω or any ACMOS gate as long as the input voltage level at the X72 pin is met as described above. -
Page 82: Changing The "Y" Coefficients
Ctl Reg: 0204, Res temp off: BFC53F7D., Lamp temp off: C003B7E9. FC: disabled, Srvc: low r> Note: It is not necessary for the X72 to be locked to enter the 1PPS configuration commands, but it must be locked for actual synchronization to occur. Changing the “y” Coefficients... -
Page 83: The "J" Command
1PPS states. The “g” Command The “g” command allows you to change the X72 to operate in any of three modes which affect the output of the Lock Pin (pin 21). Note that this 1PPS mode can be changed by the user but cannot be saved. If power is cycled to the unit it reverts to the factory default. -
Page 84: 1Pps Firmware Versions
Rb or Rb/1PPS lock indicator at pin 21 and a Service indicator on pin 8 of the X72 I/O connector. The 1PPS LED firmware uses the same functions for pin 21, but pin 8 is reserved for 1PPS lock indication only. There is no Service pin on the 1PPS LED versions. -
Page 85: Flywheeling Recovery - Normal
Figure D-3 Flywheeling Recover with 1PPS offset < 1µsec In this test the X72 was synchronized to 1PPS before this data set. Antenna is removed at hour 0 and reapplied at approximately hour 12.5. The X72 1PPS output signal had reached an offset of 220 nanoseconds. -
Page 86: Recovery With Jamsynch
Figure D-4 Flywheeling Recover with 1PPS offset > 1µsec In this test, the antenna to the GPS receiver is removed. The X72 is purposely put off frequency long enough to induce a 1PPS error over 1µsec. When the antenna is reapplied, the X72 1PPS recovers by resetting to 1PPS 0 nanoseconds (JamSynch). -
Page 87: X72 1Pps Algorithm Theory Of Operation
X72 qualifies 1 pulse per second inputs by analyzing the time difference between the X72’s 1PPS output and the external 1PPS input. This is referred to as the HoldOver state. The X72 determines whether the 1PPS input is useable by calculating the rate of change in timing measurements that are taken once per second. -
Page 88: X72 1Pps Algorithm High Level Flow Chart
X72 1PPS Algorithm Theory of Operation X72 1PPS Algorithm High Level Flow Chart Figure D-5 X72 1PPS Algorithm States X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004... -
Page 89: Initialization
During initialization the algorithm sets up variables based on the time constant (TC) and damping factor (DF). The X72 checks for 1PPS input once per second, and if present, it enters the holdover state. Automatic mode is used when the time constant is set to 0. -
Page 90: Holdover
X72 1PPS Algorithm Theory of Operation Holdover During holdover, 1PPS input statistics are accumulated and periodically the results are calculated (CalcSlope State). The sample size is set to 120 data points (120 seconds). Figure D-7 X72 Holdover State X72 Desiger’s Reference and User’s Guide... -
Page 91: Calcslope
X72 1PPS Algorithm Theory of Operation Calcslope When the frequency difference between the X72 and the 1PPS source is calculated, if the –9 difference is < ±3 x E the state changes from holdover to JamSynch. This state executes every 120 seconds during holdover. -
Page 92: Jamsynch
X72 1PPS Algorithm Theory of Operation JamSynch When the X72 1PPS output is compared to the X72 1PPS Input, if the difference is ≥ 1 µsec. the state returns to holdover to collect a second data set When two consecutive slopes are in range, the X72’s 1PPS output is synchronized to its... -
Page 93: Discipline
X72 1PPS Algorithm Theory of Operation Discipline In the Discipline State, the X72 uses a PID (proportional-integral-derivative) method to steer the 1PPS output of the X72. This method means the X72 average frequency offset is close to zero. You can expect to see some frequency change when recovering from holdover. - Page 94 X72 1PPS Algorithm Theory of Operation X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
- Page 95 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide...
- Page 96 PRFS firmware purpose of this guide voltage-controlled crystal oscillator, VCXO recommendations defined related documentation X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
- Page 97 W—W warnings defined warranty web address w command wireless warm-up cycle 097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide...
- Page 98 W—W X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004...
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