GE Reason RT430 Technical Manual

Reason RT430

complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is provided without liability and is subject

to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.

Technical Manual

GPS Grandmaster Clock

Platform Hardware Version: A

Platform Software Version: 05

Publication Reference: RT430-TM-EN-5

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Contents

TECHNICAL MANUAL 1

PREFACE 7

ACRONYMS AND ABBREVIATIONS 8

SAFETY SECTION 10

1 Chapter Overview 10

2 Health and Safety 10

3 Symbols 10

4 Installation, Commissioning and Servicing 11

4.1 Lifting Hazards 11

4.2 Electrical Hazards 11

4.3 Fusing Requirements 13

4.4 Equipment Connections 13

4.5 Pre-energisation Checklist 14

4.6 Peripheral Circuitry 14

4.7 Upgrading/Servicing 15

5 Decommissioning and Disposal 15

6 Standards Compliance 15

6.1 EMC Compliance 16

6.2 Product Safety 16

6.3 Installation Category 16

6.4 Protective Class 16

6.5 Environment 16

6.6 R&TTE Compliance 16

1. DESCRIPTION 17

1.1 INTRODUCTION 17

1.2 FOREWORD 18

1.3 KEY FEATURES 18

1.4 AVAILABLE MODELS 19

1.4.1 NETWORK PORTS 19

1.4.2 POWER SUPPLY 19

1.5 FRONT AND REAR VIEWS 20

1.6 TECHNICAL SPECIFICATIONS 21

1.6.1 POWER SUPPLY 21

1.6.2 GPS ANTENNA INPUT 21

1.6.3 GPS ANTENNA 22

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1.6.4 ANTENNA CABLE 22

1.6.5 INTERNAL OSCILLATOR 23

1.6.6 TTL LEVEL ELECTRICAL OUTPUTS (IRIG-B004/PPX/DCF77) 23

1.6.7 OPEN COLLECTOR ELECTRICAL OUTPUTS 24

1.6.8 OPTICAL OUTPUTS 24

1.6.9 AMPLITUDE MODULATED OUTPUTS 24

1.6.10 SERIAL PORT (RS232, RS422/485) 25

1.6.11 DRY-CONTACT RELAY (LOCKED) 25

1.6.12 EVENT INPUT 25

1.6.13 PRECISION TIME PROTOCOL PTP (IEEE 1588) 26

1.6.14 ETHERNET PORTS 26

1.6.15 ENVIRONMENT 26

1.6.16 DIMENSIONS, WEIGHT 28

2. INSTALLATION 29

2.1 UNPACKING 29

2.2 NORMAL USE OF THE EQUIPMENT 29

2.3 EXTERNAL INDICATIONS 29

2.4 ENVIRONMENT 30

2.5 MOUNTING 30

2.6 CONNECTORS 30

2.7 POWER SUPPLY 31

2.7.1 AC POWER CONNECTION 32

2.7.2 DC POWER CONNECTION 32

2.7.3 EARTHING (GROUNDING) 33

2.8 POWERING UP 33

2.9 GPS ANTENNA TERMINAL 34

2.10 TTL ELECTRICAL OUTPUTS 36

2.11 OPEN-COLLECTOR ELECTRICAL OUTPUTS 36

2.12 OPTICAL OUTPUTS 37

2.13 AMPLITUDE MODULATED OUTPUTS 38

2.14 SERIAL PORT (RS232, RS422/485) 38

2.15 DRY-CONTACT RELAY (LOCKED) 40

2.16 EVENT INPUT 40

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2.17 TYPE TEST 41

3. COMMUNICATION 45

3.1 COMMUNICATION 45

3.2 FACTORY DEFAULT SETTINGS 45

3.3 NETWORK PORT AND COMMUNICATION PROTOCOLS 46

3.4 DIRECT COMMUNICATION 46

3.5 COMMUNICATION VIA ETHERNET NETWORK 48

3.6 EQUIPMENT ACCESS 49

4. CONFIGURATION 50

4.1 WEB INTERFACE 50

4.2 NETWORK PARAMETERS 50

4.2.1 ETHERNET 1/2 51

4.2.2 DEFAULT GATEWAY 51

4.2.3 DNS SERVER 52

4.2.4 SENDING CONFIGURATION 52

4.2.5 CONFIGURATION SUMMARY 52

4.3 TIME FEATURES 53

4.3.1 TIME SETTINGS 54

4.3.2 SENDING CONFIGURATION 54

4.3.3 CONFIGURATION SUMMARY 55

4.4 SYNCHRONISM OUTPUTS 55

4.4.1 OUTPUTS 56

4.4.2 SERIAL DATAGRAM 57

4.4.3 CUSTOMIZABLE DATAGRAMS 57

4.4.4 SENDING CONFIGURATION 59

4.4.5 CONFIGURATION SUMMARY 59

4.5 PTP CONFIGURATION 62

4.5.1 PROFILE 62

4.5.2 DOMAIN NUMBER 63

4.5.3 NETWORK PROTOCOL 63

4.5.4 OPERATION MODE 63

4.5.5 DELAY MECHANISM 63

4.5.6 MASTER AND SLAVE CLOCKS 64

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4.5.7 PTP MESSAGES 64

4.5.8 SENDING CONFIGURATION 64

4.5.9 CONFIGURATION SUMMARY 65

4.6 CONFIGURATIONS CONTROL 67

4.6.1 CONFIGURATION MANAGEMENT 67

4.6.2 PASSWORD CONFIGURATION 68

5. OPERATION 69

5.1 LOCAL ACCESS (IHM) 69

5.1.1 STATE INDICATORS 69

5.1.2 DISPLAY MONITORING 69

5.2 REMOTE ACCESS (INTERFACE WEB) 70

5.2.1 MONITORING EQUIPMENT STATUS 70

5.2.2 GENERAL INFORMATION 71

5.2.3 EVENTS INPUT 72

6. MAINTENANCE 74

6.1 SYNCHRONISM FAILURE (LOCKED SIGNALING) 74

6.1.1 LOCKED INDICATOR (IHM) 74

6.1.2 REMOTE MONITORING (WEB INTERFACE) 74

6.1.3 DRY-CONTACT RELAY (LOCKED) 74

6.1.4 IRIG-B SIGNAL 75

6.1.5 PTP PROTOCOL 75

6.1.6 NTP PROTOCOL 75

6.1.7 SNTP PROTOCOL 75

6.2 FIRMWARE UPDATE 75

6.3 EQUIPMENT KEY CHANGE 76

6.4 CLEANING INSTRUCTIONS 78

6.5 EQUIPMENT RETURN 78

6.6 INSTRUCTIONS FOR EQUIPMENT REPAIR/SERVICE FOR SERVICE

PERSONNEL 78

APPENDIX A – CORTEC 80

APPENDIX B -IRIG-B STANDARD SUMMARY 82

APPENDIX C - PTP STANDARD CONCEPTS (IEEE1588) 87

APPENDIX D – SERIAL DATAGRAMS 93

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APPENDIX E - GPS ANTENNA DELAY COMPENSATION 97

APPENDIX F –APPLICATION EXAMPLES 99

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PREFACE

Products developed by Alstom are continuously improved. The information this document contains reflects

this improvement, and for this Alstom it is subject to change without notice. Please make sure that this is

latest version of this document before proceeding. All specifications are subject to changes without prior

notice.

Certification to the ISO 9001:2008 quality standard is an example of this commitment.

We encourage and appreciate any feedback and will use it to improve our products and

services.

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ACRONYMS AND ABBREVIATIONS

AC - Alternating Current;

ACEB NEMEA - Acronyms and Abbreviations;

ASCII - American Standard Code for Information Interchange;

BMC - Best Master Clock;

BNC - Bayonet Neil Concelman connector;

Bps – Bytes per second;

bps - Bits per second;

CAT5 - Network Cable;

CF - Federal Constitution;

PLC – Programmable Logic Controller;

CMOS - Complementary Metal-Oxide-Semiconductor;

DB9 - Connector do type D-subminiature;

DC - Direct Current;

DCF77 - Time synchronism protocol Deutschland LORAN-C (Long Range Navigation - C) Frankfurt 77 (77,5

kHz);

DNS - Domain Name System;

DTE - Data Terminal Equipment;

E2E - End-to-end;

ETH - Abbreviation of the term Ethernet;

FW - Abbreviation of the term Firmware;

GND - Abbreviation of the term Ground;

GPS - Global Positioning System;

GPZDA - Serial Datagram format;

HTTP - Hypertext Transfer Protocol;

HTTPS - Hypertext Transfer Protocol Secure;

IEC - International Electrotechnical Commission;

IED - Intelligent Electronic Devices;

IEEE - Institute of Electric and Electronic Engineers;

IHM - Human-Machine Interface;

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IP - Internet Protocol;

IP40 - Degree of protection 40;

IRIG-B - Time synchronism protocol Inter Range Instrumentation Group (Rate Designation B);

LCD - Liquid Crystal Display;

MAC - Media Access Control;

NTP - Network Time Protocol;

OUT - Abbreviation of the term Output;

P2P - Peer-to-peer;

PLC- Programmable Logic Controller;

PPM - Pulse per minute;

PRP - Parallel Redundancy Protocol;

PPS - Pulse per Segundo;

PPX - Pulse per X s;

PTP - Precision Time Protocol;

RFC - Data formatting specification RFC 1951, DEFLATE; RJ45 - Ethernet Connector with 8 condutors;

RS232/485 - Serial port levels;

RT - Temporal Recorder (Alstom's Temporal Synchronization Equipment);

RX - Receiving data;

SNMP - Simple Network Management Protocol;

SNTP - Simple Network Time Protocol;

ST - Bayonet-lock connector;

TCP - Transmission Control Protocol;

TMARK - Daily pulses with programmable time;

TTL - Transistor-to-Transistor logic;

TX - Data transmission;

UDP - User Datagram Protocol;

UTC - Universal Time Coordinate.

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SAFETY SECTION

1 Chapter Overview

This chapter provides information about the safe handling of the equipment. The equipment must be properly

installed and handled in order to maintain it in a safe condition and to keep personnel safe at all times. You

must be familiar with information contained in this chapter before unpacking, installing, commissioning, or

servicing the equipment.

2 Health and Safety

Personnel associated with the equipment must be familiar with the contents of this Safety Information.

When electrical equipment is in operation, dangerous voltages are present in certain parts of the equipment.

Improper use of the equipment and failure to observe warning notices will endanger personnel.

Only qualified personnel may work on or operate the equipment. Qualified personnel are individuals who

are:

 familiar with the installation, commissioning, and operation of the equipment and the system to which it

is being connected.

 familiar with accepted safety engineering practises and are authorised to energise and de-energise

equipment in the correct manner.

 trained in the care and use of safety apparatus in accordance with safety engineering practises

 trained in emergency procedures (first aid).

The documentation provides instructions for installing, commissioning and operating the equipment. It

cannot, however cover all conceivable circumstances. In the event of questions or problems, do not take any

action without proper authorisation. Please contact your local sales office and request the necessary

information.

Each product is subjected to routine production testing for Dielectric Strength and Protective Bonding Continuity

3 Symbols

Throughout this manual you will come across the following symbols. You will also see these symbols on

parts of the equipment.

Caution: Refer to equipment documentation. Failure to do so could result in damage to the

equipment

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Risk of electric shock

Ground terminal. Note: This symbol may also be used for a protective conductor (ground) terminal if

that terminal is part of a terminal block or sub-assembly.

Protective conductor (ground) terminal

Both direct and alternating current

Instructions on disposal requirements

The term 'Ground' used in this manual is the direct equivalent of the European term 'Earth'.

4 Installation, Commissioning and Servicing

4.1 Lifting Hazards

Many injuries are caused by:

 Lifting heavy objects

 Lifting things incorrectly

 Pushing or pulling heavy objects

 Using the same muscles repetitively

Plan carefully, identify any possible hazards and determine how best to move the product. Look at other

ways of moving the load to avoid manual handling. Use the correct lifting techniques and Personal Protective

Equipment (PPE) to reduce the risk of injury.

4.2 Electrical Hazards

All personnel involved in installing, commissioning, or servicing this equipment must be

familiar with the correct working procedures.

Consult the equipment documentation before installing, commissioning, or servicing the

equipment.

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Always use the equipment as specified. Failure to do so will jeopardise the protection

provided by the equipment.

Removal of equipment panels or covers may expose hazardous live parts.

Do not touch until the electrical power is removed. Take care when there is

unlocked access to the rear of the equipment.

Isolate the equipment before working on the terminal strips.

Use a suitable protective barrier for areas with restricted space, where there

is a risk of electric shock due to exposed terminals.

Disconnect power before disassembling. Disassembly of the equipment may expose sensitive

electronic circuitry. Take suitable precautions against electrostatic voltage discharge (ESD) to

avoid damage to the equipment.

NEVER look into optical fibres or optical output connections. Always use optical power meters

to determine operation or signal level.

Testing may leave capacitors charged to dangerous voltage levels. Discharge capacitors by

reducing test voltages to zero before disconnecting test leads.

It is the responsibility of the user to ensure that the equipment is installed, operated and used

for its intended function in the manner specified by the manufacturer.

If the equipment is used in a manner not specified by the manufacturer, the protection

provided by the equipment may be impaired.

To reduce the risk of electrical shock, pre-insulated tubular pin terminals should be used on

the ends of the power connections. The pin terminals should be completely inserted into the

connector supplied with the unit so that no metallic parts are exposed.

Operate the equipment within the specified electrical and environmental limits.

Before cleaning the equipment, ensure that no connections are energized. Use a lint free cloth

dampened with clean water.

Integration of the equipment into systems shall not interfere with its normal functioning.

The functioning of the device has been certified under the circumstances described by the

standards mentioned on item 2.17 (Type Tests). Usage of the equipment in different

conditions from the specified in this manual might affect negatively its normal integrity.

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The equipment shall have all their rear connectors attached even if they are not being used, in

order to keep their levels of ingress protection as high as possible

Never manipulate liquid containers near the equipment even when it is powered off.

Avoid modification to the wiring of panel when the system is running.

4.3 Fusing Requirements

A high rupture capacity (HRC) fuse type with a maximum current rating of 10 Amps and a

minimum dc rating of 250 V dc may be used for the auxiliary supply (for example Red Spot

type NIT or TIA). Alternatively a miniature circuit breaker (MCB) of type C, 10A rating,

compliant with IEC 60947-2 may be used.

Reason devices contain an internal fuse for the power supply which is only accessed by

opening the product. This does not remove the requirement for external fusing or use of an

MCB as previously mentioned. The ratings of the internal fuses are:

RT430 unit: 2 Amp, type T, 250V rating

4.4 Equipment Connections

Terminals exposed during installation, commissioning and maintenance

may present a hazardous voltage unless the equipment is electrically

isolated.

Tighten M3 clamping screws of heavy duty terminal block connectors to a nominal torque of

1.0 Nm.

Tighten captive screws of header-type (Euro) terminal blocks to 0.5 Nm minimum and 0.6 Nm

maximum.

Always use insulated crimp terminations for voltage and current connections.

Always use the correct crimp terminal and tool according to the wire size.

In order to maintain the equipment’s requirements for protection against electric shock, other

devices connected to the RT430 shall have protective class equal or superior to Class I.

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Watchdog (self-monitoring) contacts are provided to indicate the health of the device on some

products. We strongly recommend that the user hard wire these contacts into the substation's

automation system, for alarm purposes.

Earth the equipment with the supplied PCT (Protective Conductor Terminal).

Do not remove the PCT.

The PCT is sometimes used to terminate cable screens. Always check the PCT’s integrity after

adding or removing such earth connections.

The user is responsible for ensuring the integrity of any protective conductor connections

before carrying out any other actions.

The PCT connection must have low-inductance and be as short as possible. For best EMC

performance, ground the unit using a 10 mm (0.4 inch) wide braided grounding strap.

All connections to the equipment must have a defined potential. Connections that are pre-

wired, but not used, should be earthed, or connected to a common grouped potential.

Pay extra attention to diagrams before wiring the equipment. Always be sure that the

connections are correct before energizing the circuits.

4.5 Pre-energisation Checklist

Check voltage rating/polarity (rating label/equipment documentation).

Check protective fuse or miniature circuit breaker (MCB) rating.

Check integrity of the PCT connection.

Check voltage and current rating of external wiring, ensuring it is appropriate for the

application.

4.6 Peripheral Circuitry

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Where external components such as resistors or voltage dependent resistors (VDRs) are

used, these may present a risk of electric shock or burns if touched.

Operation of computers and equipment connected to RT430 under environmental conditions

such as temperature and humidity that exceed the conditions specified in their respective

manuals can cause malfunctioning or even irreversible damage to them or the nearby

installation.

There might be situations in which the RT430 is operating within its environmental operational

range, but the computers, equipment connected to them or nearby equipment are operating

outside their operational range. That situation can cause malfunctioning and/or irreversible

damage to those devices. In that occasion the communication to the Reason equipment might

be compromised but its recording, operational and safety capacities will not be affected.

4.7 Upgrading/Servicing

Do not insert or withdraw modules, PCBs or expansion boards from the

equipment while energized, as this may result in damage to the equipment.

Hazardous live voltages would also be exposed, endangering personnel.

Internal modules and assemblies can be heavy and may have sharp edges. Take care when

inserting or removing modules into or out of the IED.

5 Decommissioning and Disposal

Before decommissioning, completely isolate the equipment power supplies (both poles of any

dc supply). The auxiliary supply input may have capacitors in parallel, which may still be

charged. To avoid electric shock, discharge the capacitors using the external terminals before

decommissioning.

Avoid incineration or disposal to water courses. Dispose of the equipment in a safe,

responsible and environmentally friendly manner, and if applicable, in accordance with

country-specific regulations.

6 Standards Compliance

Compliance with the European Commission Directive on EMC and LVD is demonstrated using a Technical

File.

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6.1 EMC Compliance

Compliance with IEC 60255-26:2013 was used to establish conformity.

6.2 Product Safety

Compliance with IEC 61010-1:2010 was used to establish conformity.

6.3 Installation Category

Compliance with IEC 61010-1:2010 Overvoltage Category II.

6.4 Protective Class

Protective Class I. This equipment requires a protective conductor (earth) to ensure user safety.

6.5 Environment

IEC 60068-2-1, IEC 60068-2-2, IEC 60068-2-30, IEC 60068-2-14, IEC 60255-21-1, IEC 60255-21-2. The

equipment shall always be installed in a specific cabinet or housing which will enable it to meet the

requirements of IEC 60529 with the classification of degree of protection IP54 or above.

6.6 R&TTE Compliance

Radio and Telecommunications Terminal Equipment (R&TTE) directive 99/5/EC.

Conformity is demonstrated by compliance to both the EMC directive and the Low Voltage directive, to zero

volts.

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1. DESCRIPTION

1.1 Introduction

RT430 - GPS Grandmaster Clock is a clock referenced to GPS satellites, whose main application is to be a

source of temporal synchronization signals in different formats and protocols to synchronize internal clocks

of equipment and systems based on digital processing.

It has high accuracy (100 ns) and signal stability, even in situations where there is loss of GPS satellites.

Provides temporal synchronization for applications as synchrophasor measurement, traveling wave fault

location, and other applications.

The timing information presented on the front display of the RT430 can be referenced local or UTC time and

can be modified by the DST rules defined by the user.

It supports the following protocols sync time:

 PTP (Precision Time Protocol) according to IEEE1588 standard, eliminating delay from message

processing which pass in other devices in the network;

 NTP/SNTP;

 IRIG-B004 (Demodulated);

 IRIG-B124 (Modulated);

 DCF77;

 Serial Datagrams through the RS232 and RS422/485 serial ports.

This User Manual is structured as follows:

Chapter 1 presents the description of the RT430, its applications, technical characteristics and presentation

of the manual.

Chapter 2 shows how the RT430 should be installed considering the power, cable connection, sync outputs,

etc.

Chapter 3 shows the communication mechanisms to access monitoring and configuration interfaces of the

RT430.

Chapter 4 describes how the RT430 should be configured according to the options parameter of timing

sources and network parameters.

Chapter 5 shows how to operate the RT430, describing the local interface access and status indicators for

operation and remote monitoring.

Chapter 6 describes concepts and procedures to maintain the RT430.

Appendix A presents the format of the signals that compose the standard IRIG-B timing.

Appendix B presents the concepts of standard PTP synchronization (IEEE1588).

Appendix C presents the format of the synchronization signals based on Serial datagrams.

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Appendix D presents the considerations used by RT430 to compensate delays inserted by the cable length

of the GPS antenna.

Appendix E gives some architectures implementing the RT430 as a source of timing for different electronic

devices.

1.2 Foreword

This technical manual provides a functional and technical description of Alstom Grid's RT430, as well as a

comprehensive set of instructions for using the device. We have attempted to make this manual as accurate,

comprehensive and user-friendly as possible. However we cannot guarantee that it is free from errors. Nor

can we state that it cannot be improved. We would therefore be very pleased to hear from you if you

discover any errors, or have any suggestions for improvement. All feedback should be sent to our contact

centre via the following URL:

http://www.alstom.com/grid/contactcentre/

1.3 Key Features

 100 ns accuracy;

 Temporal synchronization reference through GPS antenna and PTP server input;

 PTP temporal synchronization protocol according to IEEE1588-2008 standard;

 PTP profile option, according to IEEE C37.238 standard;

 High accuracy internal oscillator system;

 Time signals in IRIG-B004, IRIG-B124, or DCF77 format;

 Pulses: 100 pulses-per-second, 1 pulse-per-second, 1 pulse-per-minute;

 Freely configurable low frequency pulse generator from 1 pulse-every-60-seconds to 1 pulse-every-

24-hours;

 Pulse on-time with daily repetition;

 User-configurable rules for daylight-saving-time and configurable time zone;

 Delay compensation for GPS antenna cables;

 NTP/SNTP server using Ethernet port;

 Status monitoring using SNMP;

 Configurable over Ethernet using Web Interface;

 RS232 and RS422/485 serial ports with frequency variable pulse and datagram subject to user

definitions;

 4 independent Ethernet network outputs 10/100Base-T for configuration and access to the

equipment;

 2 electrical outputs with screw connectors (one of them is insulated) with an individual supply

capacity up to 150 mA, TTL level, normal or reversed polarity, and singly programmable output

signal;

 2 electrical outputs with BNC connectors (one of them is insulated) with an individual supply capacity

up to 150 mA, TTL level, normal or reversed polarity, and singly programmable output signal;

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 2 open collector outputs for voltages up to 400 V, normal or reversed polarity, and singly

programmable output signal;

 1 output in modulation amplitude for IRIG-B124 signal;

 2 optical outputs with ST connector and multimode fiber;

 1 event input with screw connector CMOS/Level TTL;

 Synchronization fault contactor Relay (LOCKED);

 Front indicators for monitoring synchronization from GPS antenna and equipment status;

 19’’ Panel Installation;

 AC or DC power sources with two sources for equipment redundancy external power possibility;

1.4 Available Models

RT430 is available in different versions, according to the features used in the two Ethernet network

interfaces and the level of the power supplies.

For information about the different models, go to the order code on datasheet of the equipment.

1.4.1 Network Ports

Each network interface can have the configuration shown in the table below:

TABLE 1: Possible configuration of Ethernet ports according to the enabled and blocked features.

ETHERNET PORT 1

ETHERNET PORT 2

MC¹ ONLY

MC

1

+ NTP/SNTP+ IEEE 1588 PTP

MC

1

+ NTP/SNTP+ IEEE 1588 PTP

MC

1

+ NTP/SNTP

MC

1

+ NTP/SNTP

------------------

MC

1

+ NTP/SNTP+PRP

1

Ethernet interface for monitoring and configuration.

The equipment comes from manufacturer with a key that enables the features requested by the client. To

check the enabled features, access Chapter 5. For instructions about key changes to enable new features,

access Chapter 6.

1.4.2 Power Supply

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It is also possible to obtain equipment with one or two power supply sources option, the second used for

redundancy. Each power supply source can have the configuration shown in the table below:

TABLE 2: Possible configuration of the power supply source.

POWER SUPPLY 1

POWER SUPPLY 2

Not applicable

Without

110-240 V ac, 100-250 V dc

1.5 Front and Rear Views

The front panel of RT430 comprises a LCD display, two indicators and buttons to navigate through the

screen. The Figure 1, shows the front view of the equipment.

Figure 1: Front view of the RT430

It has an LCD display (16 columns x 2 lines) for time monitoring and network setup. The display's first screen

shows temporal reference information: day of the week, day, month, year, day of the year, hours, minutes,

seconds, time zone and the number of monitored satellites.

By navigating through the display using the buttons (arrows pointing right and left), it is possible to check the

configuration of the equipment's two Ethernet network. IP addresses, network mask, gateway, broadcast and

DNS server are shown for each network.

The LOCKED indicator on, indicates that the equipment is synchronized with time reference from at least 4

GPS satellites.

The Alarm indicator on, indicates that the equipment is not operating and it is necessary the operator's

attention.

Figure 2, shows the equipment's rear panel components.

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GE Reason RT430 Technical Manual

GE Reason RT430 Technical Manual

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