Microsemi ATS-6501 T-Flex User manual

ATS-6501 T-Flex
ATS-6501B T-Flex
ATS-6501B SAASM T-Flex
GPS Time & Frequency Standard
Users Guide
Software Version 5.2.X
Release V
Jan 2017

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Revision History
Revision Description Date Approved
A Initial release 02/10/09 KM
B Command updates 05/23/09 GAR
C Add 4395A-5, NASA 36 10/02/09 GAR
D Added support contact information 11/10/09 GAR
E Add 4372A, DC power correction 2/24/10 GAR
F Add C of C 3/29/10 GAR
G Added 4393A TIC Card, tagps, other updates 6/17/10 GAR
H Add 1 MHz module. Emphasize need to save user settings.
Add diag log selections. Change software update
procedure
12/14/10 GAR
J Add SAASM version 01/26/11 GAR
K Two-Way over Fiber 06/06/11 GAR
L OS Upgrade. Command/status changes. Modified GPS
Tracking Alarms. Modified alarm structure for latching
and non-latching alarm types.
11/08/11 KM
M Added SNMP Functionality. Updated help menu
Added configuration not readable alarm.
Changed to status reference:frequency:external
04/18/12 WF
N Introduction of the 4395B-(1,5,10) and 4385B
Correct command for NTP status.
1/25/13 WF
M Added SNMP Functionality. Updated help menu.
Added configuration not readable alarm.
Changed to status reference:frequency:external
04/18/12 WF
O Added the ability to recover time without an external GNSS
reference. Added Timescale commands, settings, and
status. Added System Configuration (syscfg) Files
9/6/2013 KM
P Added support for 4396A/4397A 2MHz Card
Fixed issues with GPS logging on the SAASM Receiver.
Microsemi acquisition.
12/31/2013 KM
Q Added operations recommendation when using an external
reference
1/20/14 GR
R Added support for 4394A-ECL Card 3/10/14 WF
S Added support for 4391 Card
Leap-Second info for setting time manually
5/27/14 KM
T NTP Specs, SNMP Function updates, Deterministic PLL,
6300 Series Chassis Monitoring (SMCP), 4376A RS-422
PPS Card, 4383A DC Input card
2/5/2015 KM
T, Rev 1 4374A T1 Card 2/18/2015 KM
U SNMP/NTP Authentication, RADIUS, User Accounts,
SSH Keys. Steer Sources, 4394A Specs., Syscfg
10/10/2016 KM
V 4337A Card , SMCP updates 01/12/2017 WF

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Table of Contents
1 General Information .........................................................................................................1
1.1 Introduction .......................................................................................................... 1
1.2 Ordering Information ........................................................................................... 1
2 Installation........................................................................................................................4
2.1 Powering on the ATS-6501.................................................................................. 4
2.2 Communicating with the ATS-6501 .................................................................... 5
2.2.1 DHCP............................................................................................................ 5
2.2.2 Static IP Addresses ....................................................................................... 5
2.2.2.1 Network..................................................................................................... 5
2.2.2.2 Console Cable ........................................................................................... 5
2.2.3 Setting a Static IP Address............................................................................ 6
2.2.4 Firewall Settings ........................................................................................... 7
2.2.5 USB Ports...................................................................................................... 8
2.2.6 RADIUS Authentication............................................................................... 8
2.3 Antenna Installation ............................................................................................. 9
2.3.1 Antenna Location.......................................................................................... 9
2.3.2 Setting the Antenna Voltage ....................................................................... 11
2.3.3 Outdoor Antenna Grounding ...................................................................... 12
2.3.4 Antenna Mask Angle .................................................................................. 12
2.3.5 Positioning Modes ...................................................................................... 13
2.3.5.1 Dynamic Position Mode.......................................................................... 13
2.3.5.2 Auto Position Mode ................................................................................ 13
2.3.5.3 Manual Position Mode ............................................................................ 15
2.4 ATS-6501 Installation ........................................................................................ 16
2.4.1 Power Supplies............................................................................................ 17
2.4.2 Input/Output Cards...................................................................................... 17
2.4.2.1 4394A (PPS/DC IRIG) ................................................................................ 17
2.4.2.2 4376A RS-422 PPS...................................................................................... 19
2.4.2.3 4394A-ECL (PPS-ECL)............................................................................... 21
2.4.2.4 4391 Code Generator ................................................................................... 22
2.4.2.5 4395A-10 / 4395B-10 10MHz Card ............................................................ 29
2.4.2.6 4395A-5 / 4395B-5 5MHz Card .................................................................. 29
2.4.2.7 4395A-1 / 4395B-1 1MHz Card .................................................................. 30
2.4.2.8 4387A, 4387A-6V, and 4387A-1V (Modulated IRIG/NASA36) ............... 30
2.4.2.9 4396A/4397A 2MHz Output Card............................................................... 32
2.4.2.10 4394A T1 (1.544MHz) Output Card .......................................................... 32
2.4.2.11 4372A-T Fiber Output Card (Two-Way).................................................... 33
2.4.2.12 4393A Time Interval Counter (TIC) Card .................................................. 34
2.4.2.13 4383A IRIG Input Card .............................................................................. 35
2.4.2.14 4337A Modulated IRIG with Epoch Support ............................................. 36
2.5 Antenna Delay Calibration................................................................................. 37
2.6 On Time Point (OTP)......................................................................................... 38
2.7 Using an External Frequency Reference............................................................ 39

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2.7.1 Reference Type ........................................................................................... 39
2.7.2 hp5071A Communications ......................................................................... 40
2.7.3 Unmonitored Clocks ................................................................................... 40
2.7.4 Selecting the External Reference ................................................................ 40
2.8 Using the Time Scale Reference ........................................................................ 41
2.9 Setting the System Time Manually .................................................................... 45
2.9.1 Force Time .................................................................................................. 45
2.9.2 Deterministic Phase Lock Loop (DPLL) .................................................... 45
2.9.3 External Reference...................................................................................... 48
2.9.4 Disable the GPS Tracking Alarms.............................................................. 48
2.10 User Configuration Files ................................................................................ 48
2.10.1 Factory / Default User Configuration Files ................................................ 48
2.10.2 Diff Command ............................................................................................ 50
2.10.3 FTP and Real-Time (rt) Configuration Files .............................................. 50
2.10.4 System Configuration Files (Syscfg) .......................................................... 52
2.10.5 Node Configuration File (node.cfg)............................................................ 53
3 Operations ......................................................................................................................55
3.1 Front Panel ......................................................................................................... 55
3.1.1 Power Supply Indicators .................................................................................. 55
3.1.2 Alarm Indicator........................................................................................... 55
3.1.3 Oscillator Locked (Osc Lock) Indicator ..................................................... 56
3.1.4 GPS Tracking Indicator .............................................................................. 56
3.1.4 NTP Locked Indicator................................................................................. 57
3.1.5. Outputs Enabled Indicator .......................................................................... 57
3.1.6. KEY ACTIVE Indicator (SAASM)............................................................ 57
3.1.7. ZEROIZE Button (SAASM)....................................................................... 58
3.1.8. CRYPTO KEY Programming Connector (SAASM) ................................. 58
3.1.9. Fans ............................................................................................................. 58
3.1.10. Flash Card ............................................................................................... 58
3.1.11. Display Button......................................................................................... 58
3.2 Rear Panel .......................................................................................................... 59
3.3 Software ............................................................................................................. 60
3.3.1 Current Version........................................................................................... 60
3.3.2 Software Updates ........................................................................................ 60
3.3.2.1 Flash Card Replacement.......................................................................... 61
3.3.2.2 Remote Software Update ........................................................................ 61
3.3.3 GPS Firmware Updates............................................................................... 63
3.3.4 Declassifying the System............................................................................ 63
3.4 User Interfaces.................................................................................................... 63
3.4.1 Operating System........................................................................................ 63
3.4.2 Telnet .......................................................................................................... 63
3.4.3.1 Real Time Data Port (1135) .................................................................... 64
3.4.3.2 Command Port (1700)............................................................................. 64
3.4.3.3 Diagnostic Port (1800)................................................................................. 67
3.4.3.4 Status Port (1900).................................................................................... 68
3.4.3.5 Average TIC Data Port (2100) ................................................................ 68

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3.4.3.6 Raw TIC Data Port (2101) ...................................................................... 69
3.4.4 File Transfer Protocol (FTP)....................................................................... 70
3.4.5 Network Time Protocol (NTP) ................................................................... 70
3.4.5.1 NTP Authentication................................................................................. 70
3.4.5.2 NTP Server.............................................................................................. 71
3.4.5.3 NTP Clients ............................................................................................. 73
3.4.6 Simple Network Management Protocol (SNMP) ....................................... 73
3.4.6.1 Management Information Base (MIB).................................................... 73
3.4.6.2 SNMP2 .................................................................................................... 73
3.4.6.3 SNMP3 .................................................................................................... 73
3.4.6.4 Testing SNMP3 ....................................................................................... 74
3.4.6.5 SNMP Traps............................................................................................ 75
3.4.7 Secure Shell (SSH) Authentication............................................................. 75
3.4.7.1 Creating a SSH New Key........................................................................ 75
3.4.7.2 Transferring a SSH Key .......................................................................... 75
3.5 Local User Accounts .......................................................................................... 75
3.6 Status Command ................................................................................................ 76
3.7 GPS Data Logging (Not available on SAASM Type I) ..................................... 77
3.7.1 FTP Data Logging....................................................................................... 77
3.7.2 Real Time Data Logging............................................................................. 80
3.8 WAAS Satellites (Not available in SAASM version)........................................ 81
3.9. System Verification............................................................................................ 82
4 Theory of Operations......................................................................................................96
4.1 Generation of Timing Signals ............................................................................ 96
4.2 GPS..................................................................................................................... 96
4.3 Deterministic PLL (6501B only)........................................................................ 96
4.4 Output Signals .................................................................................................... 97
4.5 GPS Data Collection (Not available in SAASM Type 1) .................................. 97
4.6 Startup Sequence ................................................................................................ 98
5 Maintenance .................................................................................................................100
5.1 Internal Inspection ................................................................................................ 100
5.2 Antenna and Antenna Cable Inspection................................................................ 100
5.3 Fan Filter............................................................................................................... 101
6. Troubleshooting............................................................................................................102
6.1 Front Panel Indications..................................................................................... 102
6.2 Alarm Light ...................................................................................................... 102
6.2.1 Power Supplies.......................................................................................... 103
6.2.2 Outputs Enabled........................................................................................ 104
6.2.3 GPS Performance...................................................................................... 105
6.2.3.1 Poor GPS Receiver Performance .......................................................... 106
6.2.3.2 GPS Not Tracking ................................................................................. 107
6.2.4 Internal Clocks .......................................................................................... 108
6.2.5 External Reference.................................................................................... 109
6.2.6 NTP Server................................................................................................ 112
6.2.7. PTD Value is Noisy .................................................................................. 112
6.2.8 Over Temperature and Fans...................................................................... 112

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6.2.9 PPS Outputs .............................................................................................. 113
6.2.10 IRIG Outputs................................................................................................ 114
6.2.11 NASA36 Outputs ......................................................................................... 115
6.2.12 TIC Measurements....................................................................................... 116
6.2.13 4391 Code Generator ................................................................................... 116
6.2.14 Software Update Failure .............................................................................. 117
6.2.15 Configuration Not Readable ........................................................................ 117
6.3 Communication Problems ................................................................................ 117
6.3.1 LAN .......................................................................................................... 117
6.3.2 USB-to-Serial Adapter (94000-115200) (Command Port)....................... 117
6.3.3 External Reference Adapter (94001-5071A) ............................................ 118
6.4 Syslog Command ............................................................................................. 118
6.5 System Configuration Issues (syscfg) .............................................................. 119
6.6 Troubleshooting Summary............................................................................... 119
Appendix A System Specifications..............................................................................................121
Appendix B Status Command Fields ...........................................................................................129
Appendix C Status Port (1900) Example .....................................................................................135
Appendix D Detailed Command Information ..............................................................................147
Appendix E System Recovery Without GNSS ............................................................................193
Appendix F System Monitoring and Control Protocol (SMCP) ..................................................196
F.1 Description ....................................................................................................... 196
F.2 Configuring SMCP........................................................................................... 197
F.3 NodeIDs ........................................................................................................... 200
F.4 Troubleshooting ............................................................................................... 203
F.5 Node_directive Command................................................................................ 204
F.6 PPS Steer Source.............................................................................................. 205
F.7 IRIG Steer Source ............................................................................................ 206
Appendix G System Configuration (syscfg) ................................................................................208
Appendix H Julian Date Calendars ..............................................................................................212
Appendix I Certificate of Compliance .........................................................................................214
Figures
Figure 1 Antenna Location ............................................................................................... 10
Figure 2 Antenna Cable .................................................................................................... 11
Figure 3 Rear Panel Output Card Locations ..................................................................... 17
Figure 4 Input/Output Cards ............................................................................................. 17
Figure 5 Timing System Diagram..................................................................................... 38
Figure 6 External Frequency Reference ........................................................................... 39
Figure 7 ATS-6501 Front Panel........................................................................................ 55
Figure 8 ATS-6501 SAASM Front Panel......................................................................... 55
Figure 9 ATS-6501 Rear Panel......................................................................................... 59
Figure 10 ATS-6501 SAASM Rear Panel ........................................................................ 59
Figure 11 ATS 6501 Rear Panel Connections .................................................................. 60
Figure 12 Flash Card......................................................................................................... 61
Figure 13 Upstream Fiber Packet ................................................................................... 196

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Tables
Table 1 Power Supply Indicator Status............................................................................. 55
Table 2 Alarm Indicator.................................................................................................... 56
Table 3 Oscillator Locked Indicator ................................................................................. 56
Table 4 GPS Tracking Indicator ....................................................................................... 57
Table 5 NTP Locked Indicator ......................................................................................... 57
Table 6 Outputs Enabled Indicator ................................................................................... 57
Table 7 Key Indicator ....................................................................................................... 57
Table 8 System Command List......................................................................................... 67
Table 9 Maintenance Schedule ....................................................................................... 100
Table 10 Troubleshooting Summary .............................................................................. 120
Table 11 Parent Node Types.......................................................................................... 201
Table 12 Child Node Types ........................................................................................... 202
Table 13 2000 Series Chassis Node Types .................................................................... 203
Table 14 3000 Series Chassis Node Types .................................................................... 203
Table 15 6300 Series Chassis Node Types .................................................................... 203
Table 12 Node Directives .............................................................................................. 204

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1 General Information
1.1 Introduction
The ATS-6501 Tflex is a state-of-the-art GPS Disciplined time and frequency reference. It
utilizes an internal rubidium (Rb) atomic clock and low noise synthesizer (LNS) in conjunction
with GPS measurements to provide outputs that are characterized by the short-term stability of
the atomic clock and the long-term stability of the GPS constellation. Additionally, it provides
the user with the capability to enhance the frequency stability and holdover performance of the
unit by using an external cesium (Cs) clock as the reference. This provides a scalable architecture
that allows users to fulfill a wide range of current and future requirements with a single unit. The
ATS-6501 is suitable for a variety of precise time and frequency applications.
The 1 Pulse per Second (1 PPS) accuracy and frequency stability of the ATS-6501 is further
enhanced by using a dual-frequency (L1/L2) GPS receiver. The dual-frequency receiver applies
corrections to the GPS timing signals that remove a significant portion of the errors due to
ionospheric delay. The measurements can also be made available to users for the purpose of
modeling the total electron content (TEC) of the ionosphere.
The SAASM version utilizes the next generation security architecture provided by the key data
processor (KDP) allowing unclassified-when-keyed operation, black key ability, and other
features available only with SAASM technology.
In applications where reliability is a must the ATS-6501 is capable of operating from an AC (100
– 240VAC, 50-60 Hz) or DC Power -48 VDC (SELV type) (-18 to -60 VDC) source and comes
with two fully redundant power supplies. The unit is capable of operating from a single supply in
the event one of the two power supplies fails.
The ATS-6511 is a fiber distribution system that derives its references and stability from at least
one ATS-6501. The ATS-6511 has two fiber I/O connections that allow for two-way time
transfer between the two systems. This capability allows the ATS-6511 outputs to be set on time
in relation to the ATS-6501 providing the reference signals and also provides for precise
calibration through the two-way time transfer. A 4372A-T module can be ordered and installed
in an ATS-6501 to supply the fiber signals to an ATS-6511. The fiber connection includes all
timing signals to provide the same capability and performance of the ATS-6501 in the ATS-6511.
A TSC-4340 distribution amplifier can be connected to a 4372A-T output to provide up to 8 more
outputs to ATS-6511s. The 4372A-T module includes input capability to monitor the status of
each ATS-6511 connected either directly to the 4372A-T module or through a TSC-4340
distribution amplifier.
1.2 Ordering Information
ATS 6501B (Tflex): Standard dual frequency GPS time and frequency standard. Dual AC input
supplies included. Requires external frequency reference or internal Rubidium reference and
includes two 1 PPS/DC IRIG, one 10 MHz, and one AM IRIG output module. A dual frequency
GPS antenna is included with unit.
ATS 6501B-xx-S00 (SAASM Tflex): Dual frequency SAASM GPS time and frequency
standard. Dual AC input supplies included. Requires external frequency reference or internal

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Rubidium reference and includes two 1 PPS/DC IRIG, one 10 MHz, and one AM IRIG output
module. A dual frequency GPS antenna is included with unit.
Option D (DC Power Input): Provides DC input (-48 VDC (SELV type) (-18 to -60 VDC))
capability instead of AC for one of the supplies. The second power supply is still AC.
Option D2 (Dual DC Power Input): Provides dual DC input (-48 VDC (SELV type) (-18 to -60
VDC)) capability instead of AC.
Option F (Front Panel Memory Card): Provides access to the unit’s non-volatile memory via the
front panel. This option allows users to perform a complete software upgrade in the field without
returning the unit to Microsemi. Additionally, the unit can be declassified by simply removing
the flash card from the system.
Option R (Internal Rb Reference): Integrates an internal Rubidium (Rb) frequency reference as
part of the unit. This allows the unit to operate without using an external frequency reference as
well as steer the internal reference based upon the clock offset and GPS measurements.
Option –S00 (SAASM Unit): Replaces the Standard L1/L2 GPS Receiver with the SAASM
version. The unit will also have the internal Rb as well as the front panel flash.
Input/Output Cards: The ATS-6501 has a wide selection of input/output cards available:
1. 4376A RS-422 1PPS Card, 4 PPS Output Card
2. 4391A Code Generator Card
3. 4395A-10 Four 10 MHz Sinewave Outputs
4. 4395B-10 Four Low Phase Noise 10 MHz Sinewave Outputs
5. 4395A-5 Four 5 MHz Sinewave Outputs
6. 4395B-5 Four Low Phase Noise 5 MHz Sinewave Outputs
7. 4395A-1 Four 1 MHz Sinwave Outputs
8. 4395B-1 Four Low Phase Noise 1 MHz Sinewave Outputs
9. 4394A: Programmable PPS and DC IRIG Module. Users can define the signal types
and operating parameters. Default set up is two 1PPS Outputs (Ports 1 and 2) and
two DC IRIG Outputs (Ports 3 and 4) (Default Timecode = B000)
10. 4394A-ECL Two Programmable differential PPS-ECL Outputs
11. 4387A Four Modulated IRIG Outputs (Default Timecode = B120) or NASA36.
12. 4387A-1V Four 1V Modulated IRIG Outputs (Default Timecode = B120) or
NASA36