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

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13. 4387A-6V Four 6V Modulated IRIG Outputs (Default Timecode = B120) or

NASA36

14. 4396A/4397A Four 2.048MHz (E1) outputs that comply with ITU-T Rec. G.703

15. 4372A-T Four input/output single mode fiber optic module for supplying signals to a

TSC-4340 or ATS-6511

16. 4393A Four Channel TIC Card. Users can measure the 1PPS of up to four different

devices relative to the internal clock and obtain these measurement results in real

time.

17. 4383A IRIG Input Card. Users can set the system time manually using an IRIG Time

Source. Ports 1 and 2 support DC IRIG and Ports 3 and 4 support AM IRIG.

Options:

94000-115200 USB Console Cable: Allows users to connect to the system Command Port

via a serial cable. Formerly P/N OP001

94001-5071A USB External Reference Communication Cable: Provides a serial

communications port to an external frequency reference (i.e. 5071A). Formerly P/N OP002

TSC-4340AS-8S: 1 U fiber expansion chassis with single mode input and 8 single mode

outputs.

TSC-4340AM-8M: 1 U fiber expansion chassis with one multimode mode input and 8 multi-

mode outputs.

Notes:

1. The correct Microsemi part number is constructed by appending the desired options to the base model in

alphabetical order. None of the options are mutually exclusive so users can select as many options as

desired.

Example Part Number: ATS-6501-DFR

Description: Tflex with 1 AC input and 1 DC input option, front panel memory option, and internal

rubidium clock reference option.

2. Antenna cables sold separately.

3. All units include an L1/L2 antenna, network time protocol (NTP), 94000-115200 (RS232 console

cable), Ethernet control, and data logging capabilities.

4. Contact Microsemi (www.microsemi.com) for current pricing and availability.

5. 94000-115200 and 94001-5071A are DTE devices; this may require the use of a null modem serial

cable.

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2 Installation

The ATS-6501 provides a number of features which may require additional setup and this section

provides a guideline for the basic setup. After completing this section, the ATS-6501 will

produce timing outputs to the coarse calibration accuracies specified in Appendix A. The ATS-

6501 is designed to be quickly and easily integrated with other system components. Just a few

steps are required in setting up the system so that it will begin producing accurate timing outputs.

In order to set the system up, users will need to power up the system and set up communications

in order to have access to the system command port.

2.1 Powering on the ATS-6501

Apply power to the system by supplying input power to at least one of the two power supplies.

When power is applied to the ATS-6501 the front panel will go through a self-test and then the

ATS-6501 will begin booting up.

Note: If power is applied to both power supplies the Status Indicator on the front panel of both

power supplies should be green. If power is applied to only one of the two supplies the power

supply without input power should have a red Status Indicator and the units Alarm Indicator

should be red.

Note: The ATS-6501 front panel Power-On Self-Test (POST) will occur even if the front panel

software flash is removed.

A. The Date/Time display will sequentially test each segment on each individual position

within the display. On the SAASM receiver version, the KEYED LED will blink quickly

to indicate self-test, then either turn off or green to indicate the receiver’s Key status.

B. One at a time, each position of the display will display the number 8 starting from the far

left and working to the right.

C. Each LED below the Date/Time Display (Alarm, Oscillator Locked, GPS Tracking, NTP

Locked, & Outputs Enabled) will be turned on one at a time starting from the left to right.

As each LED is tested it will be green, then red, and then turn off with the exception of

the GPS Tracking indicator, this indicator will turn red, then green, then off.

D. The Date/Time display will then display “-9876543210” on the front panel.

E. Lastly the Date/Time display will have a “-” in the center of each position in the display.

F. When the unit starts the application, the Oscillator Lock, GPS Tracking, and NTP Locked

indicators will turn red momentarily then go out.

G. While the ATS-6501 is booting up and waiting for the internal oscillator to lock the LED

indicators on the front panel below the Date/Time display should be off and the bars in

the display after the POST will move to the top, then center, then bottom and then go out.

This display will repeat as long as the unit is not tracking GPS.

Caution: The default antenna supply voltage is ZERO. If the antenna requires power from the

ATS-6501 to operate the system will stay in this mode until the antenna is properly configured.

This prevents the system from potentially damaging any antennas until the antenna supply voltage

is set properly by the end user.

As the ATS-6501 warms up, the Oscillator Lock indicator should come on within 5 minutes after

the system is turned on. The Alarm light may remain on until the Outputs are enabled. This is

normal and does not indicate there is a problem with the unit.

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2.2 Communicating with the ATS-6501

Operators are capable of communicating with the system through a LAN connection or via one of

the USB Ports when using ATS 6501 OP001 USB to Serial cable to access the command port.

2.2.1 DHCP

The ATS-6501 runs DHCP by default and will therefore automatically be assigned an IP address

if it is connected to a network with a DHCP server. The ATS-6501 will display the current IP

address assigned to the unit in the Date/Time display after pressing and releasing the Display

pushbutton on the front panel. Users can use this IP Address to access the systems command

port.

Note: If the LAN Cable is not connected or the unit does not obtain an IP Address from a DHCP

Server an IP Address is not assigned and the front panel display button will not display an IP

address for the system. Once the LAN cable is connected to the unit it will automatically attempt

to obtain an IP address from a DHCP Server. If this does not work you may need to power cycle

the unit.

2.2.2 Static IP Addresses

If you require a Static IP Address there are two options to set the network information in the

system.

2.2.2.1 Network

If the network has a DCHP Server you can obtain the IP Address (ip addr) by pressing and

releasing the Display pushbutton on the front panel. Telnet into the system using “telnet ip addr

1700”. Once the “ATS-6501>” prompt is displayed run the network_config command to

manually configure the IP address for the unit. See Section (2.2.3).

If the network does not have a DHCP Server, press and hold the front panel display pushbutton

for ~10 seconds until the display shows the IP Address of 192.168.0.1. This temporarily sets the

IP Address of the unit. Telnet into the system using “telnet 192.168.0.1 1700”. Once the “ATS-

6501>” prompt is displayed use the network_config command to manually configure the IP

address for the unit. (See section 2.2.3).

Note: If the LAN Cable is removed and reconnected the unit will attempt to obtain an IP Address

from the DHCP Server. If the default static IP Address (192.168.0.1) was set it may get reset.

Press the Display Button on the front panel again to make sure the IP Address is still set. If not,

press and hold the button until the default static IP Address is set again.

2.2.2.2 Console Cable

This feature allows local users to set the unit up without having to access the system via the

network. Connect a terminal to one of the USB ports on the rear panel using the USB to Serial

adapter cable (94000-115200). Changes can be made using any terminal program (e.g.,

HyperTerm, TeraTerm) from the serial port of a computer/terminal. The communication settings

are 115200 Baud, No Parity, 8 Data Bits, and 1 Stop Bit. Once connectivity is established the

user will see the ATS-6501> command prompt. Execute the network_config command to set the

IP Address, Netmask, Broadcast IP, and/or Default Gateway for the system if you are using a

static IP Address. See Section (2.2.3).

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Note: We recommend that the USB-to-Serial Adapter (94000-115200) is installed in one of the

two USB ports when the system is powered on. If not, you may need to power the system down,

plug the cable in and re-apply power. The USB/Serial Cables are programmed to provide users

access to the command port (94000-115200) or to communicate with a 5071A Cesium Clock

(94001-5071A). These cables are NOT interchangeable.

Caution: By default pressing and holding the Display pushbutton on the front panel for ~10

seconds will reset the IP address to the default of 192.168.0.1. The default IP address will display

on the front panel after it is set. If the button is held down too long and the IP Address is set to

the default by mistake, you may be able to clear this by pulling the LAN connection on the rear

panel and plugging the connector back in. If not, power-cycle the unit to restore the proper

network settings. This front panel IP reset feature can be disabled using the frontpanel_button

command. Users are cautioned that the reset feature is ON by default and must be turned off if

this is not the desired behavior.

2.2.3 Setting a Static IP Address

Use the following steps to set the IP Address on the ATS-6501.

A. Telnet into the system telnet ip addr 1700 or connect to the unit via the OP001 Command

Port Cable and the ATS-6501> prompt should appear.

B. Use the network_config command and options to set the system to the desired network

settings.

network_config --mode <DHCP|static> --ip <ip addr> --mask <mask> --broadcast <broadcast> --

gateway <gateway>]

[Example]

network_config --mode static --ip 192.168.1.50 --mask 255.255.255.0 --broadcast 192.168.1.255

--gateway 192.168.1.1

C. These network settings will take effect immediately. Users should see the following:

<working> ………..

Once timed out, the connection will drop.

D. Users connected via the network will need to reconnect to the system using the newly

assigned static IP Address. Users do not need to save these changes; they are

automatically stored on the system. The ATS-6501 will start up with the new settings

each time it is rebooted or power cycled.

E. Users can also view the current network settings using the network command. This will

display the current user settings.

ATS-6501>network

[mode] static

[static]

[broadcast] 192.168.150.255

[default_gateway] 192.168.150.1

[ip] 192.168.150.61

[netmask] 255.255.255.0

[OK] 2013-08-05T14:23:28Z

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2.2.4 Firewall Settings

The system IP firewall has a default “allow all” policy. To enable the firewall, the customer

needs to create a firewall rules file on the product file system named /mod/etc/firewall.rules.

There are example firewall rules files on the product in the directory /usr/tsc/site/firewall.

Example rules files may be copied to the correct location and edited on the product using ‘vi’.

Once the rules file is setup, reboot the unit.

Note that misconfiguration of the firewall can lock out network access to the product. If that

occurs, the firewall may be disabled by using the USB command port adapter, and executing the

command firewall --disable. This removes the current firewall rules and resets it to immediately

allow all traffic exposing the device.

The firewall is the standard FreeBSD IPFW. Full documentation on the firewall configuration

may be found here: http://www.freebsd.org/doc/en/books/handbook/firewalls-ipfw.html

The suggested hardened firewall rules are:

#!/bin/sh

cmd='/sbin/ipfw -q add'

/sbin/ipfw -q flush

#

# This example file demonstrates how to:

# . allow ssh (22) access from everywhere

# . allow ntp (123) access from everywhere

# . allow snmp (161) access from everywhere

#

#ensure the device can talk to itself.

$cmd pass all from any to any via lo0

#enable "stateful" firewall functionality

#this is required for TCP and UDP rules to associate

#a "state" (connection) with each rule

#

#without this, two-rules would need to be created

#for allowing access to each "port"

#for example:

# . pass tcp from somewhere to me dst-port 12345

# . pass tcp from me to somewhere src-port 12345

$cmd check-state

#allow the device to be a DHCP client

$cmd pass udp from me to any src-port 68 dst-port 67

$cmd pass udp from any to me src-port 67 dst-port 68

#allow the device to be a DNS client

$cmd pass udp from me to any dst-port 53 keep-state

# allow ICMP

$cmd pass icmp from any to any

#######################

#allow SSH from anywhere

$cmd pass tcp from any to me dst-port 22 keep-state

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#allow ntp from anywhere

$cmd pass udp from any to me dst-port 123 keep-state

#allow snmp from anywhere

$cmd pass udp from any to me dst-port 161 keep-state

#$cmd pass tcp from any to me dst-port 161 keep-state

#$cmd pass udp from any to me dst-port 10161 keep-state

#$cmd pass tcp from any to me dst-port 10161 keep-state

# allow outgoing

$cmd pass ip from me to any keep-state

#deny all policy

$cmd drop ip from any to any

NOTE: This example file is loaded on each system in file:

/usr/tsc/site/firewall/allow_ssh_ntp_snmp.rules

2.2.5 USB Ports

The USB ports on the rear panel allow:

• Users to access the command port (94000-115200). See section 2.2.2.2. Users can

set the IP Address on the box following the instructions on section 2.2.3.B-C. The

system will automatically connect to the command port and provide the ATS-6501>

command prompt.

• The ATS-6501 to communicate with a 5071A Cesium Clock (94001-5071A). See

section 2.6.

Note: Microsemi recommends if you are going to use these cables they should be plugged into

the unit when it is powered on. If not, power the unit down, connect the desired cable(s) and

power the unit back up.

2.2.6 RADIUS Authentication

A radius server can be used to allow remote authentication. To configure, edit the

/etc/radius.conf file with the RADIUS server address and the shared password setup on the

Radius Server.

# $TSC$

#

# Note: Be sure to configure /etc/nsswitch.conf, /etc/pam.d/sshd

#

# Also be sure to add "gateway_user" to /etc/master.passwd (using the vipw command)

#

# gateway_user:*:1001:1001::0:0:Timing Solutions Corporation:/usr/tsc:/usr/tsc/bin/gateway

#

# RADIUS client config. The fields are

#

# Service type

# Server host

# Shared secret

# Timeout (optional)

# Retries (optional)

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# Dead time (optional)

# Bind address (optional)

#

#auth 192.0.2.100 shared_secret

#auth my_radius_server.example.com other.shared.secret

auth 123.123.123.123 password123

There are only 2 supported RADIUS user types: ‘admin’ and ‘non-admin.’ These can be set on

the RADIUS server when setting up each user and their passwords. See the example below for 2

users. In raddb/clients.conf file on the RADIUS server, ‘bob’ will have admin privileges while

‘ted’ does not. The ‘Filter-Id’ attribute passes those privileges.

# A user with admin privileges

bob Cleartext-Password := "hello"

Filter-Id := "admin",

Reply-Message := "Hello, %{User-Name}"

# A non-admin user

ted Cleartext-Password := "goodbye"

Reply-Message := "Hello, %{User-Name}"

Note: If you plan to set up local users, see section 3.5 before proceeding.

2.3 Antenna Installation

Installing the antenna properly requires careful planning. The antenna location itself must be

selected based solely on the ability to reliably receive the GPS Signal. This should be one of the

primary factors in selecting the installation location of this unit depending on the length of the

antenna cable.

Note: The antenna cable should have less than 10 dB of loss at 1.5 GHz. If this is not possible

due to the cable type or length of cable then additional in-line amplifiers will be need to be

installed or you will need a cable type with less loss.

The antenna included with the ATS-6501 has a mounting screw on the bottom. The screw allows

the antenna to be easily and securely mounted on a 5/8” coarsely threaded rod. Threaded rods are

available at most hardware stores and will need to be mounted securely to the side of a building

or other stationary object. Once the rod is properly secured it will provide a stable mount for the

antenna.

2.3.1 Antenna Location

This unit is typically mounted in a standard 19” equipment rack but the unit may also be operated

from a bench top. No matter which location is chosen, the installation location should be selected

keeping in mind that access to a suitable antenna location will be necessary for proper operation.

A. Placement of the GPS antenna is extremely important. It should be placed so that it has

clear view of as much sky as possible. Any obstructions such as antennas, large metal

objects, or buildings will limit the performance of the ATS-6501. The GPS antenna

should have an unobstructed line of sight to the sky. See Figure 1.

B. In selecting a location for the antenna, its proximity to the ATS-6501 should also be

considered. Ideally, the antenna will be close enough to the ATS-6501 so that there will

be a minimal loss through the antenna cable.

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WARNING: An outside antenna system should not be located in the vicinity of

overhead power lines or other electric light or power circuits, or where it can fall into

such power lines or circuits. When installing an outside antenna system, extreme care

should be taken to keep from touching such power lines or circuits as contact with them

might be fatal.

Figure 1

Antenna Location

C. Once a suitable antenna location has been identified, it is necessary to ensure that the

GPS signal that reaches the ATS-6501 is of suitable quality. The unit requires a

minimum of 15dB gain from the antenna gain combined with the amount of loss in the

antenna cable. The antenna included with the ATS-6501 has 25dB of gain so the total

cable losses in the system must not exceed 10 dB at 1.5 GHz. If you are using a different

antenna please ensure the antenna gain combined with the cable loss will provide

sufficient signal strength for the ATS-6501.

D. If the location of the antenna dictates that a longer cable must be used then a line

amplifier will need to be inserted into the signal path or you will need to run an antenna

cable with less loss. A line amplifier is a device used to amplify the GPS signal to

overcome the losses resulting from longer cable runs. In selecting a line amplifier it is

necessary to make sure that it provides an adequate amount of gain and that it operates

from 1200MHz to 1600MHz.

E. The amount of gain required from a line amplifier can be calculated by knowing the total

loss of the antenna cables being used. The signal loss due to a cable varies depending

upon the frequency of the signal. For the purposes of GPS antennas the cable loss should

be calculated at 1500MHz. The manufacturer of the cable being used should be able to

provide an estimate of the cable loss at 1500MHz. Once the cable loss is known it can be

inserted into Equation 2-1 to calculate the required gain of the line amplifier

12

100

)(_*)100/(_

)(_ −=

ftLengthCableftdBLossCable

dBGainMIN

Eq. 2-1.

F. The MIN_Gain value in Equation 2-1 serves as the minimum gain required from the line

amplifier being used. It is possible to use amplifiers with a slightly higher gain than the

minimum value but it will not improve the performance of the system. Using amplifiers

with significantly higher gain values can also cause degradation of the GPS signal

because it overdrives the input of the GPS receiver.

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G. Placement of the line amplifier is also a concern in a properly designed system. Placing

the amplifier too far from the antenna may cause unexpected degradation in the GPS

signal and the performance will remain poor. The best place for the amplifier is typically

half way between the antenna and ATS-6501. This allows the line amplifier to benefit

from any surge protection that may be installed near the antenna but is still close enough

to the antenna so as not to degrade the signal significantly. Figure 2 shows the block

diagram of a typical installation that requires a longer antenna cable. Another

consideration when installing the line amplifier is how it will receive power. Some

amplifiers are powered using a DC bias on the antenna cable and others are power from

AC adapters directly. Please contact Microsemi if you require assistance in selecting the

right amplifier for your application.

The antenna mount should be secured to a stable structure such as a building, antenna

mast, or other suitable mounting platform.

H. The antenna is designed to withstand rain, snow, and dust. When selecting the mounting

location for the antenna try to find a location that will not become buried in snow and/or

covered by foliage. Keep the top surface of the antenna clean and brush off any ice and

snow, to ensure your antenna performs optimally. In addition, ensure the connector

remains clean and dry.

2.3.2 Setting the Antenna Voltage

The ATS-6501 is capable of providing antenna power (0, 5, 12VDC) by DC biasing the antenna

cable but this can cause damage to an antenna if the wrong voltage is applied. Prior to connecting

an antenna to the unit, ensure the antenna voltage is set properly. The ATS-6501 is shipped from

the factory with the default antenna voltage of 0 volts. If this is not the desired configuration then

follow the steps below to set the proper antenna voltage.

A. Telnet into the system command port telnet ip addr 1700 or connect via the USB Port and

the command prompt should appear.

B. At the command prompt, type settings gps and press enter, this will display the user

configurable GPS settings for the unit to see verify the current voltage being supplied to

the antenna

ATS-6501>settings gps

[antenna_delay] 2.277000000000000e-07

[antenna_voltage] 1.200000000000000e+01

[datum] wgs84

[mask_angle] 1.000000000000000e+01

ATS 6501

Line Amp

Figure 2 Antenna Cable

ANTENNA

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[positioning]

[auto_hours] 1.200000000000000e+01

[manual_position]

[altitude] 1.963225000000000e+02

[latitude] 3.992277661000000e+01

[longitude] -7.758567306000000e+01

[mode] auto

[tracking_timeout] 1800

[OK] 2013-08-05T14:28:57Z

C. To change the value, type antenna_voltage and the desired value (0, 5, or 12) and press

enter. The system should respond with “OK”.

ATS-6501>antenna_voltage 12

[OK] 2013-08-05T14:30:16Z

Note: If you enter an incorrect value you will get the following error message:

ATS-6501>antenna_voltage 3

Usage: antenna_voltage <0 | 5 | 12>

[ERROR] 2013-08-05T14:30:53Z

D. You can verify the setting is correct by typing settings gps:antenna_voltage and pressing

enter, this will display the updated user configurable settings.

0 VDC 0.0000000000000000e+00

5 VDC 5.0000000000000000e+00

12VDC 1.2000000000000000e+01

The antenna voltage setting can also be verified using a voltmeter. To verify the antenna

voltage, apply the probes to the ANTENNA connector on the rear panel. The center

conductor should be at a higher potential than the ATS-6501 chassis. This voltage

reading indicates the voltage being provided to the antenna. If no voltage is present then

the antenna is not being powered by the ATS-6501.

E. If this setting is correct type save to save the current user default configuration on the

system to ensure the system provides the proper antenna voltage after a reboot or power

cycle.

2.3.3 Outdoor Antenna Grounding

If an outside antenna is connected to the ATS-6501, be sure the antenna is grounded so as to

provide some protection against voltage surges and built-up static charges. Article 810 of the

National Electrical Code, ANSI/NFPA 70 provides information with regard to proper grounding

of the mast and supporting structure, grounding of the lead-in wire to an antenna discharge unit,

size of grounding connectors, location of antenna discharge unit, connection to grounding

electrodes, and requirements for the grounding electrode.

2.3.4 Antenna Mask Angle

Adjustment of the antenna mask angle may be necessary for installations with severe multi-path

problems. The mask angle of the antenna refers to the elevation angle above the horizon at which

all satellites above it are tracked. It may be possible to track satellites below the mask angle but

the data is intentionally omitted because it is unreliable. Installations with severe multi-path

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