Microchip Technology GridTime 3000 User manual

GridTime™ 3000 Installation Manual
Overview
The GridTime 3000 is a rack mountable precision time server for digital substation applications. Its timing protocols
and ports are enabled through license bundles (See 4. Licenses for a full list of all license bundles), allowing for
different functionality to be enabled as requirements change.
The GridTime 3000 has an extensive collection of different ports, including:
• Ten Ethernet ports (two RJ-45, eight SFP) on its front panel for Network Time Protocol (NTP) and Precision
Time Protocol (PTP) time synchronization
• Fifteen ports on its back panel for input of IRIG-B, and output of a range of legacy time and frequency signals
• An antenna connector on its back panel to utilize a GNSS reference.
The GridTime 3000 is suitable for use in synchronizing industrial control and supervisory control and data acquisition
(SCADA) equipment. It can provide time synchronization to many different devices simultaneously, such as Phasor
Measurement Units (PMUs), Protection Relays, Remote Telemetry Units (RTUs) and other Intelligent Electronic
Devices (IEDs) used in electrical substations and industrial control installations.
The GridTime 3000 is suitable for harsh electromagnetic environments as all its ports are electrically isolated. This
allows output wiring to feed out to operating areas in different earth potential zones without compromising site
earthing security. The isolation also protects the device from high voltage spikes.
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 1

Table of Contents
Overview........................................................................................................................................................ 1
1. How to Use this Manual.......................................................................................................................... 6
1.1. Purpose of this Manual.................................................................................................................6
1.2. Who Should Read This Manual....................................................................................................6
1.3. Conventions Used in This Manual................................................................................................6
1.4. Warnings, Cautions, Tips, and Notes........................................................................................... 6
1.5. Related Documents and Information............................................................................................7
1.6. Where to Find Answers to Product and Document Questions.....................................................7
2. Key Benefits............................................................................................................................................8
2.1. Flexibility.......................................................................................................................................8
2.2. Redundancy................................................................................................................................. 8
2.3. Reliability......................................................................................................................................8
2.4. Time and Frequency Signals........................................................................................................9
2.5. IEC 62439-3:2016 Parallel Redundancy Protocol (PRP)...........................................................10
2.6. Event Monitoring........................................................................................................................ 10
2.6.1. Notifications................................................................................................................. 10
2.6.2. Internal Logging........................................................................................................... 11
2.6.3. Alarms..........................................................................................................................11
2.7. Device Management...................................................................................................................11
2.8. Security...................................................................................................................................... 12
2.8.1. User Security Model.................................................................................................... 12
3. Physical Overview.................................................................................................................................14
3.1. Front Panel.................................................................................................................................14
3.1.1. LCD Tabs.....................................................................................................................17
3.2. Back Panel................................................................................................................................. 19
3.3. Hardware Options...................................................................................................................... 22
3.3.1. Power Supply...............................................................................................................22
3.3.2. Oscillator......................................................................................................................22
3.4. Case Overview...........................................................................................................................23
4. Licenses................................................................................................................................................25
5. Alarms................................................................................................................................................... 26
5.1. Alarm Monitoring........................................................................................................................ 26
6. Installation.............................................................................................................................................27
6.1. Getting Started........................................................................................................................... 27
6.1.1. Security Considerations for Installations .....................................................................27
6.1.2. Site Survey.................................................................................................................. 27
6.1.3. Installation Tools and Equipment.................................................................................28
6.2. Installation Checklist...................................................................................................................29
6.3. Unpacking the Unit.....................................................................................................................30
6.3.1. Product Label...............................................................................................................30
6.4. Rack Mounting the GridTime 3000.............................................................................................30
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 2

6.5. Making Ground and Power Connections....................................................................................31
6.5.1. Ground Connections....................................................................................................31
6.5.2. Power Connections......................................................................................................32
6.6. Signal Connections.................................................................................................................... 34
6.6.1. Admin Port Connections..............................................................................................35
6.6.2. Synchronization and Timing Connections................................................................... 36
6.6.3. Alarm Relay Connections............................................................................................ 49
6.7. Installing the GNSS Antenna......................................................................................................51
6.7.1. Microchip Antenna Kit versus Custom Equipment Installations...................................52
6.7.2. Custom Installation - Antenna Port Input Requirements..............................................52
6.7.3. Custom Installation - Antenna Recommendations.......................................................53
6.7.4. Custom Installation - Cable recommendations............................................................53
6.7.5. All Installations - Connection Recommendations........................................................ 53
6.7.6. All Installations - Antenna Placement Recommendations........................................... 53
6.7.7. All Installations - Delay Compensation........................................................................ 53
6.8. Powering the GridTime 3000......................................................................................................54
6.8.1. Powering Up................................................................................................................ 54
6.8.2. Powering Down............................................................................................................55
7. Clock Management Tool (CMT)............................................................................................................ 56
8. Simple Network Management Protocol (SNMP)................................................................................... 57
8.1. GridTime 3000 Management Information Base (MIB)................................................................57
8.2. Public MIB Support.....................................................................................................................57
9. Provisioning...........................................................................................................................................58
9.1. Establishing a Connection to the GridTime 3000.......................................................................58
9.2. Logging In and Out.....................................................................................................................58
9.3. Provisioning the General Clock Settings....................................................................................60
9.4. Provisioning the Admin Ethernet Port........................................................................................ 70
9.4.1. Static IP Address......................................................................................................... 71
9.4.2. DHCP IP Address........................................................................................................72
9.4.3. Link Local IP Address..................................................................................................75
9.5. Provisioning the Ethernet Ports..................................................................................................76
9.5.1. Static IP Address......................................................................................................... 78
9.5.2. DHCP IP Address........................................................................................................79
9.5.3. Link Local IP Address..................................................................................................81
9.5.4. Provisioning PRP.........................................................................................................82
9.5.5. Provisioning VLAN Settings.........................................................................................84
9.5.6. Provisioning NTP.........................................................................................................85
9.5.7. Provisioning PTP......................................................................................................... 93
9.6. Provisioning GNSS...................................................................................................................146
9.7. Provisioning the T1/E1/J1 Ports...............................................................................................154
9.7.1. Provisioning T1 Output.............................................................................................. 155
9.7.2. Provisioning J1 Output...............................................................................................157
9.7.3. Provisioning E1 Output..............................................................................................158
9.8. Provisioning the Pulse Ports.................................................................................................... 160
9.8.1. Provisioning Standard Pulse Outputs........................................................................160
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 3

9.8.2. Provisioning G.703 Fixed Frequency Outputs...........................................................175
9.8.3. Provisioning AM IRIG-B Outputs............................................................................... 179
9.8.4. Provisioning IRIG-B Inputs........................................................................................ 183
9.9. Provisioning the Serial String Ports..........................................................................................184
9.10. Provisioning the Alarm Relay Ports..........................................................................................186
9.11. Provisioning Roles....................................................................................................................190
9.12. Provisioning SNMP Settings.................................................................................................... 195
9.12.1. Provisioning SNMP Notifications............................................................................... 197
9.12.2. Provisioning Syslog Notifications...............................................................................199
9.12.3. Provisioning SNMP Users......................................................................................... 201
9.13. Provisioning Users................................................................................................................... 204
10. Operating............................................................................................................................................ 209
10.1. Determining Status...................................................................................................................209
10.2. Test Mode.................................................................................................................................210
10.3. Changing Password................................................................................................................. 212
10.4. Changing a User's Password (Admin Only)............................................................................. 213
10.5. Upgrading the Firmware...........................................................................................................215
10.6. Retrieving the Internal Log Files...............................................................................................218
10.7. Adding new Licenses............................................................................................................... 220
11. Maintenance and Troubleshooting......................................................................................................222
11.1. Preventative Maintenance........................................................................................................222
11.2. Safety Considerations.............................................................................................................. 222
11.3. ESD Considerations.................................................................................................................222
11.4. Troubleshooting........................................................................................................................222
11.4.1. Alarm Conditions and Correction Actions..................................................................224
11.5. Antenna Installation Troubleshooting....................................................................................... 226
11.6. Power Supply Fuse Replacement............................................................................................226
11.7. Power Supply Replacement.....................................................................................................228
11.8. Returning the GridTime 3000................................................................................................... 232
11.9. Manual Updates....................................................................................................................... 232
11.10. Contacting Technical Support..................................................................................................232
12. Appendix A: Specifications..................................................................................................................234
12.1. Factory Hardware Options....................................................................................................... 234
12.2. Software License Options........................................................................................................ 234
12.3. Power Supply and Electrical Protection................................................................................... 235
12.4. Mechanical Specifications........................................................................................................235
12.5. Factory Default Settings...........................................................................................................236
12.6. Input and Output Electrical Specifications................................................................................238
12.7. Time String Specifications........................................................................................................239
12.8. GNSS Receiver Specification...................................................................................................250
13. Appendix B: Third Party Software Licenses........................................................................................252
13.1. Third Party Software.................................................................................................................252
14. Appendix C: Crimping Connectors......................................................................................................296
14.1. Crimping the DC Connector..................................................................................................... 296
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 4

14.2. Crimping the AC Connector..................................................................................................... 296
15. Revision History.................................................................................................................................. 298
Microchip Information.................................................................................................................................299
The Microchip Website........................................................................................................................299
Product Change Notification Service.................................................................................................. 299
Customer Support............................................................................................................................... 299
Microchip Devices Code Protection Feature.......................................................................................299
Legal Notice........................................................................................................................................ 299
Trademarks......................................................................................................................................... 300
Quality Management System.............................................................................................................. 301
Worldwide Sales and Service..............................................................................................................302
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 5

1. How to Use this Manual
This chapter describes the format, layout, and purpose of this manual.
1.1 Purpose of this Manual
Welcome to the GridTime™ 3000 GNSS Time Server.
This document aims to help you use the GridTime 3000 to reliably deliver high accuracy time to your end devices.
The GridTime 3000 Installation Manual contains everything you need to know for unpacking, installing, using,
maintaining, and troubleshooting the Microchip GridTime 3000 GNSS Time Server.
1.2 Who Should Read This Manual
This section describes who should read this manual and what chapters they should read.
Overview is written for general readers who want information about the product. Subsequent chapters contain
technical information about the product. Other chapters describe installation, maintenance, and configuration
instructions or details primarily intended for qualified maintenance personnel. This manual is designed for the
following categories of users:
• Systems Engineers – Overview provides an introduction to the GridTime™ 3000 GNSS Time Server. Cross-
references in this chapter direct you to detailed system information in other chapters as appropriate.
• Installation Engineers – Chapters 6. Installation through 10. Operating provide detailed information and
procedures to ensure proper installation, operation, configuration, and testing of the GridTime 3000.
• Maintenance Engineers – 11. Maintenance and Troubleshooting and the appendices provide preventive and
corrective maintenance guidelines, as well as procedures for diagnosing and troubleshooting fault indications
and alarms.
1.3 Conventions Used in This Manual
This section describes the conventions used in the GridTime 3000 Installation Manual.
This manual uses the following conventions:
•Acronyms and Abbreviations — Terms are spelled out the first time they appear in text. Thereafter, only the
acronym or abbreviation is used.
•Revision Control — The title page lists the printing date and versions of the product this manual describes.
•Wording Conventions — This manual uses the typographical conventions described in the table below.
Apperance of text Example Meaning
First letter initialized GridTime 3000 Installation Manual The title of a document or section.
All capital letters ADMIN An operating mode, alarm state,
status, or chassis label.
Bold and italicized. Microchip does not recommend... A word or term given special
emphasis.
1.4 Warnings, Cautions, Tips, and Notes
This section describes how warnings, cautions, tips and notes are used in the GridTime 3000 Installation Manual.
Warnings, Cautions, Tips, and Notes attract attention to essential or critical information in this guide. The types of
information used in this guide are as follows:
How to Use this Manual
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 6

Important: All important information use this symbol. The information icon contain installation, operation,
or maintenance procedures, practices, conditions, or statements, that provide important information for
successful operation of the device.
DANGER
To avoid serious personal injury or death, do not disregard warnings. All warnings use this symbol.
Warnings are installation, operation, or maintenance procedures, practices, or statements, that if not
strictly observed, may result in serious personal injury or even death.
CAUTION
To avoid personal injury, do not disregard cautions. All cautions use this symbol. Cautions are installation,
operation, or maintenance procedures, practices, conditions, or statements, that if not strictly observed,
may result in damage to, or destruction of, the equipment. Cautions are also used to indicate a long-term
health hazard.
Tip: All tips use this symbol. Tips indicate manufacturer-tested methods or known functionality. Tips
contain installation, operation, or maintenance procedures, practices, conditions, or statements, that
provide important information for optimum performance results.
Note: All notes appear like this. Notes contain installation, operation, or maintenance procedures, practices,
conditions, or statements, that alert you to important information, which may make your task easier or increase
your understanding.
1.5 Related Documents and Information
See your Microchip representative or sales office ([email protected]) for a complete list of available
documentation.
1.6 Where to Find Answers to Product and Document Questions
For additional information about the products described in this guide, please contact your regional sales
representative or [email protected].
For assistance with a GridTime 3000 installation issue or to arrange a return, please contact nzp-
[email protected]. See www.microchip.com/support for more information.
How to Use this Manual
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 7

2. Key Benefits
This section provides an overview of the GridTime™ 3000 GNSS Time Server’s key features.
2.1 Flexibility
With much of the power industry undergoing a digital migration, many utilities are transitioning from legacy time code
distribution to Ethernet-based time distribution. Consequently, time distribution requirements are evolving.
This is why the GridTime 3000 has been designed with a licensable hardware model, where licenses are loaded onto
the device to enable specific ports and functionality.
This way, if the time distribution needs change, and a legacy timing bus system is replaced with an Ethernet time
distribution system or a hybrid system, licenses can be purchased to enable the Ethernet timing functionality on the
GridTime 3000, instead of purchasing an entirely new time server.
2.2 Redundancy
As the power industry involves mission critical applications, ensuring equipment remains operational in the event of a
system failure is essential. This is why having redundant backup systems in place is crucial for bolstering resiliency
against failures.
For this reason, the GridTime 3000 includes multiple features, and expansion options for adding additional
redundancy.
These include:
• Parallel Redundancy Protocol (PRP) support on all Ethernet ports.
• Dual firmware images - the device stores a primary firmware image and a backup image.
– If the primary image cannot be booted, the backup image is booted instead, which becomes the new
primary image.
– This protects the device against upload of malicious or corrupted firmware.
• A dual oscillator expansion option. This offers resiliency in the event of an oscillator failure. See 3.3. Hardware
Options.
• A dual band GNSS receiver. This offers protection if GNSS spoofing or jamming is detected on one of the GNSS
bands.
2.3 Reliability
To meet the needs of the power industry, the GridTime 3000 has been equipped with features for ensuring robust and
reliable operation in the field.
These include:
• Isolated electrical inputs and outputs. This offers protection in the event of surges or large voltage transients.
• Field replaceable power supplies and power supply fuses. See 11.7. Power Supply Replacement
and 11.6. Power Supply Fuse Replacement.
• High temperature range tolerance on internal components: -10 ℃ ambient to ≥ +55 ℃ (14°F to 149 °F).
• Alarms (5. Alarms) and detailed internal logging. The GridTime 3000's detailed alarm and logging systems allow
users to easily self diagnose and remedy issues that appear in the field.
Key Benefits
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 8

2.4 Time and Frequency Signals
This section describes the timing and frequency signals the GridTime™ 3000 GNSS Time Server can output, or use
as a time source for synchronization.
The GridTime 3000 can send and receive a variety of modern and legacy time signals for time and frequency
synchronization and syntonization.
The GridTime 3000 can output the following time and frequency signals:
• Unmodulated IRIG-B signals:
– IRIG-B004 with AFNOR or C37.118.1 extensions
– IRIG-B005 with AFNOR or C37.118.1 extensions
– IRIG-B006
– IRIG-B007
• Amplitude modulated IRIG-B (AM IRIG-B) signals:
– IRIG-B124 with AFNOR or C37.118.1 extensions
– IRIG-B125 with AFNOR or C37.118.1 extensions
– IRIG-B126
– IRIG-B127
• Modified Manchester modulated IRIG-B signals:
– IRIG-B224 with AFNOR or C37.118.1 extensions
– IRIG-B225 with AFNOR or C37.118.1 extensions
– IRIG-B226
– IRIG-B227
• Simulated DCF77 receiver output signal
• Custom pulse train signal (Programmable Pulse):
– Custom frequency — 1 pulse per day to 250 pulses per second
– Custom phase offset — none through to 1 wave period, configurable to the millisecond
– Custom Duration — none through to 1 wave period, configurable to the millisecond
• Output of ITU-T G.703 signals:
– T1/J1 interface at 1.544 kbits/s - G.703 section 7
– E1 interface at 2.048 kbits/s - G.703 section 11
– 2.048 MHz fixed frequency sine and square wave - G.703 section 15
– 1.544 MHz fixed frequency sine and square wave - Also follows G.703 section 15
– 10 MHz fixed frequency sine and square wave - G.703 section 20
• Output of time strings over a serial RS422 or RS232 connection (See 12.7. Time String Specifications for string
content definitions):
– NGTS string
– IRIG J-1x string
– String A-String H serial strings
– NMEA ZDA string
– NMEA RMC string
• PTP server mode support:
– IEEE® 1588-2008 E2E Default Profile server
– IEEE 1588-2008 P2P Default Profile server
– IEEE C37.238-2011 Power Profile server
– IEEE C37.238-2017 Power Profile server
– IEC/IEEE 61850-9-3 Power Utility Profile server
– ITU-T G.8275.1 Telecom Profile
– ITU-T G.8265.1 Telecom Profile
• NTP server support:
Key Benefits
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 9

– NTP v1, v2, v3, and v4 server support
The GridTime 3000 can receive multiple time signals at once, but will only synchronize to one signal at a time. The
device follows its configured time source hierarchy when deciding which source to use for synchronization.
•GNSSs
GNSS time synchronization is supported and is recommended for use as the primary reference source for the
device. Any of the following GNSSs can be used simultaneously:
– GPS and QZSS
– GLONASS
– Galileo
– BeiDou
•IRIG-B
IRIG-B synchronization is supported through either of the IRIG In ports. The following signal formats can be
used:
– 0-5V TTL DCLS IRIG-B004 signals with C37.118.1 extensions
– 0-5V TTL DCLS IRIG-B005 signals with C37.118.1 extensions
•PTP
Depending on configuration, PTP ports could be either; forced PTP clients or can automatically enter client
mode after synchronization loss. The following PTP profiles can be used:
– IEEE 1588-2008 E2E Default Profile client
– IEEE 1588-2008 P2P Default Profile client
– IEEE C37.238-2011 Power Profile client
– IEEE C37.238-2017 Power Profile client
– IEC/IEEE 61850-9-3 Power Utility Profile client
– ITU-T G.8275.1 Telecom Profile
– ITU-T G.8265.1 Telecom Profile
•Simple Network Time Protocol (SNTP) client support
– SNTP v1, v2, v3, and v4 client support
2.5 IEC 62439-3:2016 Parallel Redundancy Protocol (PRP)
This section describes the functionality of PRP on the GridTime™ 3000 GNSS Time Server.
The GridTime 3000 supports PTP over Parallel Redundancy Protocol (PRP) on all of its Ethernet timing ports.
This allows a PTP client or server to be identically duplicated across two Ethernet ports on the device as a single
redundant interface. The GridTime 3000 can be configured to operate PRP over Ethernet timing ports 1 and 2,
Ethernet timing ports 3 and 4, Ethernet timing ports 5 and 6, Ethernet timing ports 7 and 8 and, Ethernet timing ports
9 and 10.
Note: This feature requires a PRP license to activate, and the Ethernet timing ports used must also be activated via
licenses.
Note: At no time will the GridTime 3000 operate as an Ethernet router, switch, or hub.
2.6 Event Monitoring
This section describes the supported methods for monitoring the GridTime™ 3000 GNSS Time Server’s operational
events.
2.6.1 Notifications
The GridTime 3000 generates a notification when a state change occurs, such as ‘out of sync’ to ‘in sync’, or a
system variable crosses a threshold This could include the satellite count dropping below the minimum allowable
satellites threshold.
Key Benefits
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 10

Syslog notifications, SNMP notifications, or both can be configured to be sent from the admin Ethernet port to a list of
user-defined IP addresses.
2.6.2 Internal Logging
The GridTime 3000 internally logs key operational events as they occur. The logs can be extracted using the CMT.
See 10.6. Retrieving the Internal Log Files
2.6.3 Alarms
When an event that risks the operation of the device occurs, an alarm and notification is generated.
The methods for monitoring alarms, and guidance on clearing alarms as they occur are described in 5. Alarms.
2.7 Device Management
This section describes the device management features the GridTime™ 3000 GNSS Time Server supports.
For device configuration and system monitoring, the GridTime 3000 hosts its own web browser accessible
configuration tool called the Clock Management Tool (CMT).
Figure 2-1. CMT Dashboard
The CMT can be accessed by establishing a connection to the device’s administrator (admin) USB-C® port or its
administrator (admin) Ethernet port. This process is described in 9.1. Establishing a Connection to the GridTime
3000. Once a connection has been established, an admin port IP address can be typed into a web browser on your
PC, and the login screen for the CMT will appear.
The active IP addresses of both admin ports are displayed on the device’s LCD.
Key Benefits
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 11

Figure 2-2. CMT Login Screen
2.8 Security
This section describes the key GridTime 3000's security features.
The GridTime 3000's Clock Management Tool (CMT) is password protected, and supports multiple user logins with
administrator controlled levels of access.
It also has additional security built into the upgrade procedure with RSA signatures and RSA/AES encryption
and hardware based assurance and validation modules. Preventing the upload of malicious or corrupted firmware
images.
The GridTime 3000 also supports Industry standard RSA based security on its Clock Management Tool (CMT),
AES/SHA on Simple Network Management Protocol (SNMPv3), as well as MD5 hashed Network Time Protocol
(NTP).
2.8.1 User Security Model
This section describes the user security model used by the GridTime 3000.
The GridTime 3000 features a user security model (USM) that is split into users and roles. A user is an indidivual
log in and represents one person, a role is a group in which a user may be placed in. Each role has it's own set of
admin-configured permissions and will dictate what configuration settings each user can read or write to.
With the GridTime 3000's USM each role may have multiple users assigned to it.
Note: Both Clock Management Tool (CMT) and SNMPv3 users can be assigned to a role and will have the
permission set of that role enforced..
There is always an administrator role defined, this role allows full read and write access to all settings and access
to all CMT menus. The administrator role permissions cannot be viewed or edited. Additional roles with variable
permission sets can be generated by the administrator user. Only the administrator role allows access to the
advanced CMT menus, and the CMT authorization module where CMT user login settings are modified.
Key Benefits
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 12

In addition to the administrator role, there is always an administrator CMT user defined, which is always mapped to
the administrator role. Additional CMT users can be generated in the CMT authorization module by the administrator
role. 9.13. Provisioning Users
SNMP users have to be defined by the CMT user, and in addition to basic login details (username + password), the
authentication and encryption method has to be defined. SNMP users are used by the SNMPv3 USM.
The diagram below shows a representation of the GridTime 3000 USM.
Key Benefits
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 13

3. Physical Overview
This section gives a physical overview of the GridTime™ 3000 GNSS Time Server. This includes an overview of key
device features including:
• Timing ports
• Device management ports
• Alarm and Sync LEDs
• Liquid Crystal Display (LCD)
• Power ports
• Case
The device has a 19 inch rack mount case, and features ten 1 Gbps capable Ethernet ports on its front panel, with an
array of legacy timing and frequency ports on its back panel.
3.1 Front Panel
This section describes the functionality on the GridTime™ 3000 GNSS Time Server’s front panel.
The front panel of the GridTime 3000 features the following:
• LCD
• Alarm and Sync LEDs
• LCD navigation buttons
• USB-C Admin and RJ-45 Admin ports
• Ethernet ports
Figure 3-1. GridTime 3000 Front Panel Features
GridTime™3000
Software-Enabled Time Server
1
2
3
4567
1. LCD
2. Alarm and Sync LEDs
3. LCD Navigation Buttons
4. USB-C Admin and RJ-45 Admin Ports
5. Ethernet Ports 1-2: RJ-45 Ports (x2)
6. Ethernet Ports 3-8: SFP Ports (x6)
7. Ethernet Ports 9-10: SFP+ Ports (x2)
Physical Overview
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 14

Table 3-1. Front Panel Feature Description
Feature Number Feature Description
1 LCD • Shows the device’s current time and other
system observables
• Information such as active alarms,
synchronization state, firmware version, and
the current UTC offset are displayed
• Information is organized by type on different
LCD tabs, which are accessed with the front
panel buttons. The contents of each tab is
described in 3.1.1. LCD Tabs.
2.1 Alarm LED • Flashes red when one or more alarms is
active
• Off if no alarms are active
• Active alarms are listed on the LCD Alarm
Status tab
2.2 Sync LED • Solid green when device is synchronized to a
time source - ‘in sync’ state
• Flashes green when in ‘holdover’ state, or ‘out
of sync’ state
3 LCD Navigation Buttons • The left and right buttons are used to scroll
through the LCD tabs.
• If the center button is pressed, the LCD will
display its main tab. If held, it will load the
clock power screen, where the device can be
safely shutdown or rebooted.
4.1 USB-C Admin Port • Can be connected to the following with a USB
cable to perform device management:
– A PC’s USB host port
– A tablet’s USB host port
• Supports USB 2.0
• Cannot be used to charge a device
4.2 RJ-45 Admin Port • Can be connected to the following over
an Ethernet network to perform device
management:
– PC Ethernet port
• SNMP and Syslog notifications can be
configured to be sent from the port to a list
of user-defined IP addresses
• Left LED (ACT LED) flashes green as traffic
passes through
• Right LED (LNK LED) shows link speed:
– Green if 1 Gbps
– Orange if 100 Mbps
– Off if 10 Mbps
• Cannot be used for timing
Physical Overview
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 15

...........continued
Feature Number Feature Description
5 RJ-45 Ports • Can be used for NTP and PTP time
synchronization over copper Ethernet at
speeds up to 1 Gbps
• Left LED (enabled LED) illuminates if the port
has been enabled
• Right LED (ACT LED):
– Illuminates orange when an active link is
established with the port
– Blinks as traffic passes through the port
• Cannot be used for configuration
6 SFP Ports • Can be used with an SFP for NTP or PTP time
synchronization at speeds up to 1 Gbps
• Left LED that points at the port (enabled LED)
illuminates if the port has been enabled
• Right LED that points at the port (ACT LED):
– Illuminates orange when an active link is
established with the port
– Blinks as traffic passes through the port
• Cannot be used for configuration
7 SFP+ Ports • Can be used with an SFP for NTP or PTP time
synchronization at speeds of up to 10 Gbps
• Left LED that points at the port (enabled LED)
illuminates if the port has been enabled
• Right LED that points at the port (ACT LED):
– Illuminates orange when an active link is
established with the port
– Blinks as traffic passes through the port
Physical Overview
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 16

3.1.1 LCD Tabs
This section summarizes the information on each of the GridTime™ 3000 GNSS Time Server's LCD tabs.
Table 3-2. LCD Tab Information
Name Display
Startup
display
sequence
GT3K
Startup screen 1. GT3K logo text.
GT3K 375
Startup screen 2. GT3K logo text and startup counter. Each number maps to a specific boot stage
in the firmware. Inform Microchip Support if the startup freezes on a particular number.
GridTime 3000
Startup screen 3. GridTime 3000 logo text.
GridTime 3000
Version: 1.0b1.01
Serial: CC000112
Startup screen 4. Device information.
Physical Overview
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 17

...........continued
Name Display
Main dispaly
tab
NZST +1200
07:50:15
15 JUL 2021 GNSS NONE
Current Local
Time Zone
Name
Local Time
UTC Oset
(hhmm)
Current Time
and Date
in Local Time
Current Sync Status
(In Sync)
Current Sync Source
(GNSS)
Highest Priority
Active Alarm
(None)
UTC -37
07:50:15
15 JUL 2021 NONE NSYNC
Current Sync Status
(Out of Sync)
Current Sync Source
(None)
Highest Priority
Active Alarm
(Out of Sync
Alarm)
!
Current UTC-TAI leap second oset
(toggle with centre button)
The main display shows the local time and date, the current sync status and sync source, and the
alarm status.
Alarm Status
Tab
ALARM STATUS
Out of Sync
PG 1
Antenna Curr Low
PG 2
Holdover
No First Sync
...
Switch Pages with
Centre Button
No First Sync
Shows all currently active alarms.
GNSS Status
Tab
GNSS STATUS
Position xing
Antenna Good 08 10 11 14 18 20 21 23 24 27 29
Shows the current GNSS status, the antenna state, and the first 10 satellites being used for time
synchronization ordered by ID. A bar chart shows the signal strength of each satellite.
Physical Overview
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 18

...........continued
Name Display
Clock
Information
Tab
CLOCK INFO
USB-C IP 0.0.0.0
Firmware:
Admin IP 192.168.2.100
1.0b1.01
S/N CC000112
Shows the serial number, the firmware version and the IP address of the administration port.
Clock Power
Tab
CLOCK POWER
Reboot Shutdown
Accessed by holding the middle front panel button when on any other tab. Press the left button to
restart the device, the right button to shut down, or the middle button to return to the main tab.
Note: The shutdown is a software shutdown only, and will not switch off power to the device or its
internal components.
3.2 Back Panel
This section describes the functionality on the GridTime™ 3000 GNSS Time Server’s back panel.
Figure 3-2. GridTime 3000 Back Panel Features
1. RJ-48C T1/E1/J1 ports (x2)
2. BNC Ports 1-2 -Fixed frequency/TTL ports (x2)
3. BNC ports 3-6 -AM IRIG/TTL ports (x4)
4. BNC ports 7-8 -IRIG in/TTL out ports (x2)
5. RJ-12 RS232 and RS422 serial string output ports (x1 of each)
6. ST optical fiber output port (x2)
7. HV MOSFET port — (x1)
8. Form-C Alarm Relay Ports — (x2)
9. TNC GNSS antenna port (x1)
10. Earth Stud
11. Power supply port(s) (up to x2)
Physical Overview
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 19

Table 3-3. Back Panel Feature Description
Feature Number Feature Description
1 T1/E1/J1 Ports • RJ-48C receptacle
• Can be configured as a T1/J1
output interface at 1.544 kbits/s
- G.703 section 7
• Can be configured as an E1
output interface at 2.048 kbits/s
- G.703 section 11
2 Fixed frequency/TTL ports • Female BNC Connector
• Can output 2.048 MHz fixed
frequency sine or square waves
- G.703 section 15
• Can output 1.544 MHz fixed
frequency sine or square waves
- follows G.703 section 15
• Can output 10 MHz fixed
frequency sine or square waves
- G.703 section 20
• Can output standard GridTime
3000 Pulse output signals1 over
copper
3 AM IRIG/TTL ports • Female BNC Connector
• Can output 1kHz amplitude
modulated IRIG-B, with a 3:1
ratio.
• Can output standard GridTime
Pulse output signals1 over
copper
4 IRIG in/TTL out ports • Female BNC Connector
• Can receive a 0-5V TTL DCLS
IRIG-B signal with C37.118
extensions as a synchronization
source
• Can output standard GridTime
Pulse output signals1 over
copper
5.1 RS232 Serial String port • RJ-12 receptacle
• Can output serial time strings at
RS232 levels
5.2 RS422 Serial String port • RJ-12 receptacle
• Can output serial time strings at
RS422 levels
6 ST optical fiber ports • Female ST optical connector
• Can transmit all standard
GridTime pulse output signals1
over fiber
Physical Overview
© 2022 Microchip Technology Inc.
and its subsidiaries
Manual DS00004572A-page 20