Microsemi SyncSystem 4380A User manual

SyncSystem
4380A
Operations and Maintenance
Manual
Ju1 2017
Part Number: 098‐00723‐000
Manual updates are available at: www.microsemi.com/ftdsupport

DOC 4380A
4380A O & M Manual
i
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
Manufacturer Information:
Microsemi, Inc
4775 Walnut Street
Suite 1B
Boulder, CO 80301-2579
www.microsemi.com/time
Where to Find Answers to Product and Document Questions
For additional information about the products described in this guide, please contact your Microsemi
representative or your local sales office. You can also contact us on the web at:
www.microsemi.com/ftdsupport.
When this manual is updated the updated version will be available for downloading from Microsemi’s
internet web site. Manuals are provided in PDF format for ease of use. After downloading, you can view
the manual on a computer or print it using Adobe Acrobat Reader. Manual updates are available at:
www.microsemi.com/ftdsupport
What’s New In This Guide
This is the first release of this document.
Related Documents and Information
See your Microsemi representative or sales office for a complete list of available documentation. To order
any accessory, contact the Microsemi Sales Department. See www.microsemi.com/salescontacts/ for sales
support contact information. If you encounter any difficulties installing or using the product, contact
Microsemi Frequency and Time Division (FTD) Services and Support:
U.S.A. Call Center:
including Americas, Asia and Pacific Rim
Frequency and Time Division
3870 N 1st St.
San Jose, CA 95134
Toll-free in North America: 1-888-367-7966
Telephone: [phone]
Fax: [phone]
email: [email protected]m
Internet: www.microsemi.com/ftdsupport
Europe, Middle East, and Africa (EMEA)
Microsemi FTD Services and Support EMEA
Altlaufstrasse 42
85635 Hoehenkirchen-Siegertsbrunn
Germany
Telephone: [phone]
Fax: [phone]
E-mail: [e-mail]
[e-mail]
SyncSystem 4380A Operations and Maintenance Manual
Copyright © 2016 Microsemi
Microsemi is a trademark of Microsemi, Inc.
Other product and company names may be trademarks of their respective owners.

DOC 4380A
4380A O & M Manual
ii
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
Revision History
Revision
Description
Date
Approved
1.0
Initial Release
Feb 2016
KWM
2.0
Updated performance specifications & CE Documentation
May2016
KWM
3.0
Updated safety and fuse rating information
Jun 2016
KWM
4.0
Software Version 1.1
Jul 2017
KWM

DOC 4380A
4380A O & M Manual
iii
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
Table of Contents
1General Information .........................................................................................................1
1.1 Introduction.......................................................................................................... 1
1.2 Ordering Information ........................................................................................... 1
1.3 Safety Information................................................................................................ 2
2Installation........................................................................................................................4
2.1 Powering on the 4380A........................................................................................ 4
2.2 Application Start Up............................................................................................. 5
2.3 Communicating with the 4380A .......................................................................... 5
2.3.1 DHCP............................................................................................................ 5
2.3.2 Static IP Addresses ....................................................................................... 5
2.3.2.1 Network..................................................................................................... 5
2.3.2.2 Console Cable ........................................................................................... 5
2.3.3 Setting a Static IP Address............................................................................ 6
2.3.4 USB Ports...................................................................................................... 7
2.4 Antenna Installation ............................................................................................. 7
2.4.1 Antenna Location.......................................................................................... 7
2.4.2 Setting the Antenna Voltage......................................................................... 9
2.4.3 Outdoor Antenna Grounding ...................................................................... 10
2.4.4 Antenna Mask Angle .................................................................................. 10
2.4.5 Positioning Modes ...................................................................................... 10
2.4.5.1 Dynamic Position Mode.......................................................................... 10
2.4.5.2 Auto Position Mode ................................................................................ 11
2.4.5.3 Manual Position Mode............................................................................ 12
2.5 4380A Installation.............................................................................................. 14
2.5.1 Chassis Grounding...................................................................................... 14
2.5.2 Power Supplies............................................................................................ 14
2.5.3 Input/Output Cards...................................................................................... 15
2.5.4 4394A (PPS/DC IRIG) ............................................................................... 15
2.5.5 4376A RS-422 PPS..................................................................................... 17
2.5.6 4394A-ECL (PPS-ECL).............................................................................. 18
2.5.7 4395B-10 (10MHz)..................................................................................... 19
2.5.8 4395B-5 (5MHz)......................................................................................... 20
2.5.9 4395B-1 (1MHz)......................................................................................... 20
2.5.10 4387A Series (Modulated IRIG/NASA36)................................................. 20
2.5.11 4396A/4397A 2MHz Output Card.............................................................. 22
2.5.12 4374A T1 (1.544MHz) Output Card .......................................................... 22
2.5.13 4393A Time Interval Counter (TIC) Card.................................................. 23
2.5.14 4383A IRIG Input Card.............................................................................. 24
2.6 Antenna Delay Calibration................................................................................. 24
2.7 On Time Point (OTP)......................................................................................... 25
2.8 Using an External Frequency Reference:........................................................... 26
2.9 Setting the System Time Manually.................................................................... 28
2.9.1 Force Time.................................................................................................. 28
2.9.2 External Reference...................................................................................... 28

DOC 4380A
4380A O & M Manual
iv
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
2.9.3 Disable the GPS Tracking Alarms.............................................................. 29
2.10 User Configuration Files ................................................................................ 29
2.10.1 Factory / Default User Configuration Files ................................................ 29
2.10.2 Diff Command ............................................................................................ 30
2.10.3 FTP and Real-Time (rt) Configuration Files .............................................. 30
2.10.4 System Configuration Files (Syscfg).......................................................... 32
2.11 Powering the System Off................................................................................ 33
3. Operations ......................................................................................................................34
3.1 Front Panel ......................................................................................................... 34
3.1.1 Power Supply Indicators................................................................................. 34
3.1.2 Alarm Indicator............................................................................................... 34
3.1.3 SYNC Indicator.............................................................................................. 34
3.1.4 Outputs Indicator............................................................................................ 35
3.1.5 Fans................................................................................................................. 35
3.1.6 Status Pushbutton ........................................................................................... 36
3.2 Rear Panel .......................................................................................................... 36
3.3 Software ............................................................................................................. 37
3.3.1 Current Version .............................................................................................. 37
3.3.2 Software Updates............................................................................................ 37
3.3.2.1 Flash Card Replacement............................................................................. 37
3.3.2.2 Remote Software Update............................................................................ 38
3.3.3 GPS Firmware Updates .................................................................................. 39
3.4 User Interfaces.................................................................................................... 39
3.4.1 Telnet.............................................................................................................. 39
3.4.1.1 Real Time Data Port (1135)........................................................................ 40
3.4.1.2 Command Port (1700)................................................................................. 40
3.4.1.3 Diagnostic Port (1800)................................................................................ 42
3.4.1.4 Status Port (1900) ....................................................................................... 43
3.4.1.5 Average TIC Data Port (2100).................................................................... 43
3.4.1.6 Raw TIC Data Port (2101).......................................................................... 44
3.4.2 File Transfer Protocol (FTP) .......................................................................... 44
3.4.3 Network Time Protocol (NTP)....................................................................... 45
3.4.4 Simple Network Management Protocol (SNMP)........................................... 45
3.5 Status Command ................................................................................................ 45
3.6 GPS Data Logging ............................................................................................. 46
3.6.1 FTP Data Logging .......................................................................................... 46
3.6.2 Real Time Data Logging ................................................................................ 48
3.7 WAAS Satellites ................................................................................................ 49
3.8 System Verification............................................................................................ 49
4Theory of Operations......................................................................................................58
4.1 Generation of Timing Signals ............................................................................ 58
4.2 GPS..................................................................................................................... 58
4.3 Output Signals.................................................................................................... 58
4.4 GPS Data Collection .......................................................................................... 59
4.5 Startup Sequence................................................................................................ 59
5Maintenance ...................................................................................................................61

DOC 4380A
4380A O & M Manual
v
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
5.1 Fan Filter ............................................................................................................ 61
5.2 Antenna and Antenna Cable Inspection............................................................. 61
6Troubleshooting..............................................................................................................62
6.1 Front Panel Indications....................................................................................... 62
6.2 Alarm Light........................................................................................................ 62
6.3 Power Supplies................................................................................................... 62
6.4 Outputs Indicator................................................................................................ 63
6.5 GPS Performance............................................................................................... 65
6.5.1 Poor GPS Receiver Performance.................................................................... 65
6.5.2 GPS Not Tracking .......................................................................................... 66
6.6 Internal Clocks ................................................................................................... 67
6.7 External Reference............................................................................................. 68
6.8 PTD Value is Noisy............................................................................................ 70
6.9 Over Temperature and Fans............................................................................... 70
6.10 PPS Outputs.................................................................................................... 71
6.11 IRIG Outputs .................................................................................................. 72
6.12 NASA36 Outputs............................................................................................ 72
6.13 TIC Measurements ......................................................................................... 73
6.14 Software Update Failure................................................................................. 73
6.15 Configuration Not Readable........................................................................... 73
6.16 Communication Problems .............................................................................. 74
6.16.1 LAN................................................................................................................ 74
6.16.2 USB-to-Serial Adapter (94000-115200) (Command Port) ............................ 74
6.16.3 External Reference Adapter (94001-5071A).................................................. 74
6.17 Syslog Command............................................................................................ 74
6.18 System Configuration Issues (syscfg) ............................................................ 75
Appendix A System Specifications................................................................................................76
A.1 Environmental.................................................................................................... 76
A.2 Physical .............................................................................................................. 76
A.3 10 MHz Sinewave Input..................................................................................... 76
A.4Timing Performance........................................................................................... 76
A.5 Ethernet Interface............................................................................................... 76
A.6 USB Command Port Cable (94000-115200) ..................................................... 77
A.7 USB External Reference Port Cable (94001-5071A) ........................................ 77
A.8 GPS Receiver ..................................................................................................... 77
A.9 PPS / DC IRIG Module (4394A) ....................................................................... 77
A.10 PPS ECL (4394A-ECL).................................................................................. 77
A.11 RS-422 PPS Module (4376A) ........................................................................ 78
A.12 10 MHz Module (4395B-10).......................................................................... 78
A.13 5 MHz Module (4395B-5).............................................................................. 78
A.13 1 MHz Module (4395B-1).............................................................................. 79
A.14 Amplitude Modulated (AM) IRIG Module (4387A, 4387A-6V, 4387A-1V)79
A.15 1.544 T1 Module (4394A).............................................................................. 79
A.16 2.048MHz Module (4396A)........................................................................... 80
A.17 2.048MHz Module (4397A)........................................................................... 80
A.18 Time Interval Counter (4393A)...................................................................... 80

DOC 4380A
4380A O & M Manual
vi
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
A.19 IRIG Input Card (4383A) ............................................................................... 80
A.20 AC Power Supply (4385B)............................................................................. 81
A.21 DC Power Supply (4386A)............................................................................. 81
A.22 Power Consumption ....................................................................................... 81
A.23 Replacement Fuses ......................................................................................... 81
Appendix B CE Declaration...........................................................................................................82
Figures
Figure 1 Safety Symbols..................................................................................................... 3
Figure 2 Antenna Location ................................................................................................. 8
Figure 3 Antenna Cable ...................................................................................................... 9
Figure 4 Chassis Ground Connection............................................................................... 14
Figure 5 Rear Panel Output Card Locations..................................................................... 15
Figure 6 Input/Output Cards............................................................................................. 15
Figure 7 Timing System Diagram..................................................................................... 26
Figure 8 External Frequency Reference ........................................................................... 26
Figure 9 4380A Front Panel.............................................................................................. 34
Figure 10 4380A Rear Panel............................................................................................. 36
Figure 11 4380A Rear Panel Connections........................................................................ 37
Figure 12 AC Power Input................................................................................................ 81
Figure 13 DC Power Input................................................................................................ 81
Tables
Table 1 Power Supply Indicator Status............................................................................. 34
Table 2 Alarm Indicator.................................................................................................... 34
Table 3 Sync Indicator...................................................................................................... 35
Table 4 Outputs Indicator ................................................................................................. 35
Table 5 System Command List......................................................................................... 42
Table 6 Maintenance Schedule......................................................................................... 61

DOC 4380A
4380A O & M Manual
1
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
1 General Information
1.1 Introduction
The 4380A Sync System is a state-of-the-art GPS disciplined time and frequency reference. The low noise
synthesizer (LNS), in conjunction with GPS measurements and the Rubidium option, provide outputs that
are characterized by the short-term stability of the OCXO 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 4380A is suitable for a variety of precise time and frequency applications.
The 1 Pulse per Second (1 PPS) accuracy and frequency stability of the 4380A 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.
In applications where reliability is a must, the 4380A is capable of operating from an AC (100 –240VAC,
50-60 Hz) or DC Power 48 VDC (22 to 60 VDC) source and comes with two fully redundant hot
swappable power supplies. The unit is capable of operating from a single supply in the event one of the
two power supplies fails.
1.2 Ordering Information
4380A (Sync System): Standard dual frequency GPS time and frequency standard. Dual AC input
supplies included. Requires external frequency reference, fiber reference, or internal Rubidium (RB). The
unit does not include any daughter cards (see below) or fiber SFP modules.
4830A-ACAC-G1R: Two AC Input power supplies. 100-240VAC, 50/60Hz with GPS and internal
Rubidium.
4830A-ACDC-G1R: One AC Input power supply, 100-240VAC, 50/60Hz and one DC input power supply
(22 to 60 VDC) with GPS and internal Rubidium.
4830A-DCDC-G1R: Two DC Input power supplies, (22 to 60 VDC) with GPS and internal Rubidium.
Input/Output Cards: The 4380A has a wide selection of input/output cards available:
1. 4376A RS-422 4 Output 1PPS Card
2. 4395B-10 Four Low Phase Noise 10 MHz Sinewave Outputs
3. 4395B-5 Four Low Phase Noise 5 MHz Sinewave Outputs
4. 4395B-1 Four Low Phase Noise 1 MHz Sinewave Outputs
5. 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)
6. 4394A-ECL Two Programmable differential PPS-ECL Outputs
7. 4387A Four Modulated IRIG Outputs (Default Timecode = B120) or NASA36.
8. 4387A-1V Four 1V Modulated IRIG Outputs (Default Timecode = B120) or NASA36

DOC 4380A
4380A O & M Manual
2
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
9. 4387A-6V Four 6V Modulated IRIG Outputs (Default Timecode = B120) or NASA36
10. 4396A/4397A Four 2.048MHz (E1) outputs that comply with ITU-T Rec. G.703
11. 4372A-T Four input/output single mode fiber optic module for supplying signals to a TSC-4340
or 4380A
12. 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.
13. 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.
94001-5071A USB External Reference Communication Cable: Provides a serial communications port
to an external frequency reference (i.e. 5071A).
94020: Rail Kit for Racks 20” to 32” deep
94021: Rail Kit for Racks 24” to 30” deep
92001: Widebaand GPS Antenna
9200-12: 12dB inline amplifier
9200-21: 21dB inline amplifier
9201-TT: Lightning Arrestor
Notes:
1. Antenna cables sold separately.
2. All units include the antenna, USB dongles, 94020 Rail Kits, network time protocol (NTP),
Ethernet control, and data logging capabilities.
3. Contact Microsemi (www.microsemi.com) for current pricing and availability.
4. The 94000-115200 and 94001-5071A USB Dongles are DTE devices; this may require the use of
a null modem serial cable.
1.3 Safety Information
The following symbols are used in this manual to point out personnel hazards and safety issues when
operating and maintaining this unit.

DOC 4380A
4380A O & M Manual
3
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
!WARNING
!DANGER
!CAUTION
NOTICE
CAUTION
Danger indicates a hazardous situation which,
if not avoided, will result in death or serious
injury
Warning indicates a hazardous situation
which, if not avoided, could result in death or
serious injury
Caution, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury
Notice is used to address practices not related
to personal injury
Caution, used without the safety alert symbol,
is used to address practices not related to
personal injury
Figure 1 Safety Symbols
All of the modules and power supplies are safetly hot swappable, operators are only required to power the
system off when removing it from an equipment rack or when turning the system off.

DOC 4380A
4380A O & M Manual
4
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
2 Installation
The 4380A 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 4380A will produce timing outputs to the
coarse calibration accuracies specified in Appendix A. The 4380A 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 4380A
Apply power to the system by supplying input power to at least one of the two power supplies. When
power is applied to the 4380A the front panel will go through a self test and then the 4380A 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, then the power supply
without input power should have a red Status Indicator and the units Alarm Indicator should be red.
Note: The 4380A front panel Power-On Self Test (POST) will occur even if the software flash has been
removed from the unit.
A. The Date/Time display will sequentially test each segment on each individual position within the
display.
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, Sync, & Output) 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 Sync 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 Alarm and Sync lights will turn RED. The Outputs
indicator will remain red until NTP is locked and the outputs are turned on.
CAUTION
The default antenna supply voltage is ZERO. If the antenna requires power from the 4380A 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.
L’alimentation de l’antenne par défaut est égale à zéro. Si l’antenne nécessite une puissance de la
4380A à fonctionner, le système restera dans ce mode jusqu'à ce que l’antenne est correctement
configuré. Cela empêche le système de potentiellement endommager toute antenne jusqu'à ce que
la tension d’alimentation antenne est correctement définie par l’utilisateur final.

DOC 4380A
4380A O & M Manual
5
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
2.2 Application Start Up
Once the application has started, the front panel display will display a dash in the center of each segment.
As the application loads the segments will move to the bottom, blank, top, then center until the system has
been able to set the date and time. Refer to the Software Users Guide for more information.
2.3 Communicating with the 4380A
Operators are capable of communicating with the system through a LAN connection or via one of the USB
Ports when using 94000-115200 USB to Serial cable to access the command port.
2.3.1 DHCP
The 4380A 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 4380A 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.
2.3.2 Static IP Addresses
If you require a Static IP Address there are two options to set the network parameters in the system.
2.3.2.1 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
“4380A>” 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 “4380A>” prompt is displayed use
the network_config command to manually configure the IP address for the unit. (See section 2.3.3).
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.
2.3.2.2 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 4380A> 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 (2.3.3).
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

DOC 4380A
4380A O & M Manual
6
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
(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.
Par défaut, maintenant enfoncé le bouton d’affichage sur le panneau avant pendant environ 10 secondes
réinitialisera l’adresse IP par défaut 192.168.0.1. L’adresse IP par défaut s’affiche sur la façade une fois
définie. Si la touche est maintenue enfoncée trop longtemps et que l’adresse IP est définie par défaut par
erreur, vous pourrez effacer ceci en tirant sur la connexion au réseau local sur le panneau arrière et brancher
le connecteur arrière dans. Sinon, allumer l’appareil pour restaurer les paramètres réseau appropriés. Cette
face avant IP reset fonctionnalité peut être désactivée à l’aide de la commande frontpanel_button. Les
utilisateurs sont avisés que la fonctionnalité de réinitialisation est activée par défaut et doit être désactivée
si ce n’est pas le comportement souhaité.
2.3.3 Setting a Static IP Address
Use the following steps to set the IP Address on the 4380A.
A. Telnet into the system telnet ip addr 1700 or connect to the unit via the Console Cable and the
4380A> 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 192.168.150.64 --mask 255.255.255.0 --
broadcast 192.168.150.255 --gateway 192.168.150.1
C. These network settings will take effect immediately. Users should see the following:
<working> ……….. Once timed out, the network 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 4380A 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.
4380A-G1R>network
[ipv6] auto
[mode] static
[static]
[broadcast] 192.168.150.255
[default_gateway] 192.168.150.1
[ip] 192.168.150.64
[netmask] 255.255.255.0
[OK] 2017-07-03T15:09:43Z

DOC 4380A
4380A O & M Manual
7
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
2.3.4 USB Ports
The USB ports on the rear panel allow:
Users to access the command port (94000-115200). See section 2.3.2.2. Users can set the IP
Address on the box following the instructions in section 2.3.3.B-C. The system will
automatically connect to the command port and provide the 4380A> command prompt.
The 4380A to communicate with a 5071A Cesium Clock (94001-5071A). See section 2.7.
Note: Microsemi recommends if you are going to use these cables that the cables should be plugged into
the unit when it is powered on.
2.4 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.
NOTICE
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 4380 has a 5/8” coarse threaded mounting screw hole on the bottom. This
threaded hole 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.
2.4.1 Antenna Location
The 4380A 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 4380A. 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 4380A should also be considered.
Ideally, the antenna will be close enough to the 4380A so loss through the antenna cable is
minimized.
!DANGER
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 it from touching such
power lines or circuits as contact with them might be fatal.

DOC 4380A
4380A O & M Manual
8
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
Un système extérieur d'antenne ne devrait pas être situé à proximité des lignes à haute tension
aériennes ou d'autres circuits de lumière électrique ou de puissance, ou où il peut tomber dans de
tels lignes à haute tension ou circuits. En installant un système extérieur d'antenne, le soin
extrême devrait être pris pour le garder de toucher de tels lignes à haute tension ou circuits comme
entrent en contact avec eux force soyez mortel.
Poor Antenna Location Better Antenna Location Best Antenna Location
Figure 2 Antenna Location
C. Once a suitable antenna location has been identified, it is necessary to ensure that the GPS signal
that reaches the 4380A 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 4380A 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 4380A.
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.
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 the 4380A. 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

DOC 4380A
4380A O & M Manual
9
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
powered 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 that
your antenna performs optimally. In addition, ensure the connector remains clean and dry.
2.4.2 Setting the Antenna Voltage
The 4380A 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 4380A 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
4380A> prompt should appear.
B. At the 4380A> prompt, type settings gps and press enter, this will display the user configurable
GPS settings for the unit to view and verify the current voltage being supplied to the antenna is
correct.
4380A>settings gps
[antenna_delay] 0.000000000000000e-00
[antenna_voltage] 0.000000000000000e+00
[datum] wgs84
[mask_angle] 1.000000000000000e+01
[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] 2015-08-05T14:28:57Z
C. To change the value, type antenna_voltage and set the desired value (0, 5, or 12) and press enter.
The system should respond with “OK”.
4380A>antenna_voltage 12
[OK] 2015-08-05T14:30:16Z
Note: If you enter an incorrect value you will get the following error message:
4380A>antenna_voltage 3
Usage : antenna_voltage <0 | 5 | 12>
4380A
Line Amp
Figure 3 Antenna Cable
ANTENNA

DOC 4380A
4380A O & M Manual
10
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
[ERROR] 2015-08-05T14:30:53Z
D. You can verify the setting is correct by typing settings gps:antenna_voltage and pressing enter,
this will display the current antenna voltage setting.
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 4380A 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
4380A.
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.
2.4.3 Outdoor Antenna Grounding
If an outside antenna is connected to the 4380A, 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.
2.4.4 Antenna Mask Angle
Adjustment of the antenna mask angle may be necessary for installations with severe multipath 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 problems may find that they get better timing
performance out of the 4380A when using a higher mask angle. To set the mask angle, access the system
via the command port and use the mask_angle command to set the desired mask angle for the receiver.
Mask angle value is in degrees.
4380A>mask_angle 10
[OK] 2015-08-05T15:05:12Z
You can verify the current value of the mask angle by sending the settings gps:mask_angle command.
4380A>settings gps:mask_angle
1.000000000000000e+01
[OK] 2015-08-05T15:04:43Z
If this setting is correct, type save to save the current user default configuration on the system to ensure the
system uses the proper mask angle after a reboot or power cycle.
2.4.5 Positioning Modes
The 4380A offers three different modes for determining the antenna position and determining receiver
operation: dynamic, auto, and manual.
2.4.5.1 Dynamic Position Mode
The Dynamic mode is typically used for systems located on mobile platforms.
NOTICE
The system default mode is dynamic. Users at static locations should change this to auto or manual based
on the information provided below.

DOC 4380A
4380A O & M Manual
11
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
2.4.5.2 Auto Position Mode
The Auto mode is recommended for static locations where the antenna location has not been surveyed.
When using the Auto mode, the 4380A will automatically determine the location of its antenna. It does this
by averaging its calculated position solutions over a period specified by the auto_hours parameter. The
factory default for the position period is 12 hours. It is recommended that the auto positioning period
should be set to at least 4 hours. Once the position_period expires, the 4380A will enter the fixed position
mode (status gps:position:fixed). Fixing the antenna position reduces the noise of the GPS measurements
and increases the frequency stability of the timing outputs.
To set the positioning mode to auto, use the position_mode command on the command port.
4380A>position_mode auto
[OK] 2015-08-05T15:26:06Z
To set the positioning period, use the position_period command. If not specified, the value will be in
hours. Users can set this value to minutes using mafter the value.
4380A>position_period 12
[OK] 2015-08-05T15:26:06Z
Select the proper datum, WGS84 (default) or NAD83, using the datum command.
4380A>datum wgs84
[OK] 2015-08-05T15:28:14Z
Use the settings gps command to verify the correct datum is being used.
4380A>settings gps
[antenna_delay] 2.650000000000000e-07
[antenna_voltage] 1.200000000000000e+01
[datum] wgs84
[mask_angle] 1.000000000000000e+01
[positioning]
[auto_hours] 1.200000000000000e+01
[manual_position]
[altitude] 1.963545000000000e+02
[latitude] 3.992275796000000e+01
[longitude] -7.758566956000000e+01
[mode] auto
[tracking_timeout] 1800
[OK] 2015-08-05T15:27:19Z
If these settings are correct, type save to save the current user default configuration on the system to ensure
the system uses the positioning mode and period after a reboot or power cycle.
Note: If the unit is rebooted, power cycled, or the application is restarted with the positioning mode set to
auto, the system will go through the process of determining its antenna position based on the position
period (auto_hours). Once that period expires, the system will again set itself fixed and use the new
determined solution as the fixed position. It will do this each time this occurs. The [ptd] or UTC offset
value reported by the system will be noisier during the auto position period and will become significantly
quieter when the antenna position is fixed.
In addition to automatically determining its antenna location, the 4380A generates a RINEX (Receiver
INdependent EXchange) format observation file. This file format is a standard used by the GPS
community and provides all the necessary GPS measurements for determining the antenna location. The
file can be retrieved from the system by using ftp (login: ftp, password: ftp) to log in and retrieve the file.
The file will be in the “rinex” subdirectory and will have a “.[yy]o” extension where [yy] represents the last
two digits of the current year. Many online processing centers are available (e.g.,
http://www.ngs.noaa.gov/OPUS, http://sopac.ucsd.edu/cgi-bin/SCOUT.cgi) and will process the
observation file free of charge. Doing this improves the position estimate of the antenna and is

DOC 4380A
4380A O & M Manual
12
098-00723-000–Jul 2017 Revision 4.0 SyncSystem 4380A O&M Manual
recommended for precise time recovery. After this is complete, it is possible to set the position mode to
manual using the coordinates provided by those services.
Note: The receiver has a countdown timer to show the amount of time left (position_period) while in the
auto positioning mode. Once this timer counts to zero, the RINEX file will be generated, the receivers
position (status gps:position:fixed) will be true, and the [time_remaining] field will no longer be present in
the status message.
4380A>status gps:auto_positioning
[time_remaining] 10 hours, 51 minutes
[OK] 2015-08-05T15:32:05Z
4380A>status gps:position
[alt] 1.965699000000000e+02
[fixed] false
lat] 3.992275579961000e+01
[lon] -7.758567122127999e+01
[OK] 2015-08-05T15:32:33Z
2.4.5.3 Manual Position Mode
If the location of the antenna is known, then the Manual mode should be used. This mode uses the
information provided by the datum, latitude, longitude, and altitude parameters to fix the antenna position
at startup.
NOTICE
This bypasses the auto positioning period and the 4380A will not generate a RINEX observation file. This
mode of operation is recommended ONLY if the antenna position is known. Once you set any of these
three parameters (lat, lon, or alt), the 4380A will automatically go into manual mode.
CAUTION
If the operator enters the manual position incorrectly, the system will indicate it is tracking satellites in the
status output, however the system may show the gps status as “not tracking”both in the status results and
on the front panel. To correct this problem ensure the position is entered correctly. If this does not work,
set the unit to the auto position mode and re-survey the antenna position.
Si l’opérateur saisit la position manuel incorrectement, le système indiquera que c’est suivi des satellites
dans la sortie de l’État, mais le système peut afficher l’état de gps comme « ne pas de suivi » dans les
résultats de l’État et sur le panneau avant. Pour correct ce problème verifier la position a été entrée
correctement. Si cela ne fonctionne pas, passez sur le mode automatique de la position et nouveau levé la
position de l’antenne.
4380A>status gps:satellite:number
9
[OK] 2015-08-05T15:36:14Z
4380A>status gps:mode:desc
tracking
[OK] 2015-08-05T15:37:27Z
To manually set the antenna position, use the following steps:
A. Select the proper datum, WGS84 (default) or NAD83, using the datum command.
4380A>datum wgs84