Alstom DS Agile H38 Series User manual

DS Agile H38x
Global Documentation
H38x/EN GL/D11

DS Agile H38x Global Documentation
CONTENTS
1. INTRODUCTION
2. SAFETY AND HANDLING
3. FUNCTIONAL DESCRIPTION
4. TECHNICAL DATA
5. INSTALLATION
6. MAKING CONNECTIONS TO THIS PRODUCT
7. MAINTENANCE
8. CONFIGURATION & SETTINGS
9. APPLICATIONS
10. GLOSSARY

Product /Project name – Type of document
WARNING
This guide gives instructions for installation, commissioning and operation of the DS Agile H38x.
However, the guide can not cover all conceivable circumstances or include detailed information on all
topics. In the event of questions or specific problems, do not take any action without proper authorization.
Please, contact the appropriate Alstom technical sales office and request the necessary information.
Refer to the System Release Notes for new features.
Any agreements, commitments, and legal relationships and any obligations on the part of Alstom,
including settlement of warranties, result solely from the applicable purchase contract, which is not
affected by the contents of the guide.

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CONTENTS
1. INTRODUCTION 5
1.1 MiCOM - DS Agile Switches Product Range 5
1.2 Naming of MiCOM - DS Agile Ethernet Switches 5
1.3 DS Agile H38x 6
2. SAFETY AND HANDLING 7
2.1 Health and safety 7
2.2 Symbols 8
2.3 Installing, commissioning and servicing 8
2.4 De-commissioning and disposal 9
2.5 Technical specifications for safety 10
2.5.1 Protective fuse rating 10
2.5.2 Protective class 10
2.5.3 Installation category 10
2.5.4 Environment 10
2.6 Handling of Electronic Equipment 10
2.7 Packing and Unpacking 11
2.8 Guarantees 11
2.9 Copyrights & Trademarks 12
2.9.1 Copyrights 12
2.9.2 Trademarks 12
2.9.3 Warnings regarding use of Alstom products 12
3. FUNCTIONAL DESCRIPTION 13
3.1 Parallel Redundancy Protocol (PRP) 13
3.2 Base-Tx Ethernet Switch function 14
3.3 SNMP Management 15
3.3.1 H38x System MIB Structure 16
3.3.2 H38x Interface MIB Structure 16
3.3.3 H38x RMON MIB Structure 17
3.3.4 H38x PRP MIB Structure 17
3.3.5 SNMP Client Software 18
3.3.6 SNMP traps 18
3.3.7 SNMP Accessibility 18
3.4 Time Synchronisation 19
3.4.1 Precision Time Protocol (PTP) 19
3.4.2 Network Time Protocol (NTP) 19
3.4.3 IRIG-B 19
3.5 User Interface 19

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3.5.1 LED Indications 19
3.5.2 Alarm contacts 21
3.5.3 TELNET Port 21
4. TECHNICAL DATA 22
4.1 DS Agile H38x Range 22
4.2 Conformity 22
4.3 Ethernet Port Characteristics 22
4.3.1 10/100Base-Tx Port 22
4.3.2 100Base=Fx Multimode Port 22
4.3.3 100Base-Fx Single Mode Port 22
4.4 General Characteristics 23
4.4.1 Mechanical 23
4.4.2 Auxiliary Power Supply 23
4.4.3 Auxiliary Fault Relays (Power Alarm and Optical Port Alarm) 23
4.5 Ethernet Management 23
4.6 Environmental Characteristics 23
4.6.1 Dielectric, impulse and insulation 23
4.6.2 Electromagnetic compatibility 25
4.6.3 DC auxiliary power supply 30
4.6.4 AC auxiliary power supply 31
4.6.5 Atmospheric 32
4.6.6 Mechanical 33
4.6.7 Low Voltage Directive 34
4.6.8 Degrees of protection provided by enclosures 34
5. INSTALLATION 35
6. MAKING CONNECTIONS TO THIS PRODUCT 36
6.1 Connection of the protective conductor (earth) 36
6.2 Cable fitting 37
6.3 Power supply wiring 37
6.4 Alarm contacts 39
6.5 Ethernet Connection 39
6.5.1 Ethernet cable type 39
6.5.2 Parallel Redundancy Protocol (PRP) fibre-optic Ethernet port 39
7. MAINTENANCE 40
7.1 Scope 40
7.2 Pre-Maintenance Requirements 40
7.3 Repair 40
7.3.1 Replacing the DS Agile H38x 40

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8. CONFIGURATION AND SETTINGS 42
8.1 Login 42
8.2 Passwords and Access Levels 42
8.2.1 Setting the root (administrator) password 43
8.2.2 Setting the user password 43
8.2.3 Setting the SNMP V3 Administrator Password 43
8.2.4 Setting the SNMP V3 Operator Password 43
8.3 Configuration commands 44
8.4 Management commands 45
8.4.1 Upgrading Software 48
8.5 Informative commands 50
8.6 Help command 51
9. APPLICATIONS 52
9.1 Fibre Optic budget calculations 52
10. GLOSSARY 53

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FIGURES
FIGURE 1: DS AGILE H38X FUNCTIONAL DIAGRAM 13
FIGURE 2: EXAMPLE PRP REDUNDANT NETWORK 14
FIGURE 3: SNMP MANAGEMENT 15
FIGURE 4: H38X FRONTPLATE SHOWING LED ALLOCATION 20
FIGURE 5: H38X CONNECTION INTERFACES SHOWING LED POSITION 20
FIGURE 6: TYPICAL TELNET CONNECTION 21
FIGURE 7: H38X DIN RAIL MOUNTING DETAILS 35
FIGURE 8: H38X CONNECTION POINTS 36
FIGURE 9: EARTHING CABLE EXAMPLE 37
FIGURE 10: POWER SUPPLY WIRING 37
FIGURE 11: POWER SUPPLY WIRING 38
FIGURE 12: POWER SUPPLY COVER AND CABLE TIE 38
FIGURE 13: ETHERNET FIBRE OPTIC TYPE LC CONNECTORS 39
FIGURE 14: REMOTE CONNECTION PROMPT 42
FIGURE 14: H38X PRP CONTROL 47
FIGURE 15: H38X SOFTWARE UPGRADE 48
FIGURE 16: FIBRE BUDGET 52

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1. INTRODUCTION
The MiCOM - DS Agile Ethernet range is designed to deal with the needs of a wide range of
electrical plant. Emphasis has been placed on compliance with standards, scalability,
modularity and open architecture.
These features mean that DS Agile products can be used in applications, from the most
basic to the most demanding. They also ensure interoperability with existing components.
Alstom provides a range of Ethernet products such as switches, which take into account the
compulsory requirements of electrical substations, including power supply and immunity to
environmental constraints.
We also provide solutions to specific requirements such as network redundancy
management.
The products can be used independently, or can be integrated to form a DS Agile system,
which is a Digital Control System (DCS).
1.1 MiCOM - DS Agile Switches Product Range
Driven by calls from all over the world for advanced substation applications for Automation
control and monitoring, Alstom is committed to provide a comprehensive range of Ethernet-
based products that respond to our customers' needs.
Standard Ethernet products rarely meet the constraints of electrical plants: environmental,
power supply, redundancy, etc.
The new MiCOM - DS Agile Hxxx series has been specifically tailored to respond to all of
these requirements, and is compatible with the DS Agile system. The MiCOM - DS
Agile Hxxx range is designed to address different kinds of architectures and installations.
It is split into six major ranges. These are:
−DS Agile Hx3x Ethernet Switches designed for Teaming architecture with fast
port-switch.
−MiCOM Hx4x Ethernet Switches designed for Simple Ethernet Star architecture
−MiCOM Hx5x Ethernet Switches designed for Redundant Optical Ring
architecture with fast Self-Healing technology
−MiCOM Hx6x Ethernet Switches designed for Dual Ethernet Star architecture
with Dual Homing technology
−DS Agile Hx7x Ethernet Switches designed for GOOSE filtering functionality
−DS Agile Hx8x Ethernet Switches designed for Parallel Redundant architecture
with PRP Protocol.
1.2 Naming of MiCOM - DS Agile Ethernet Switches
The Ethernet devices naming convention depends on its mechanical features and the
number of copper or optical ports.
−MiCOM - DS Agile H1xx PCI Board (the power supply is from the PCI BUS)
−MiCOM - DS Agile H3xx DIN mounting case and Redundant power supply
−MiCOM - DS Agile H6xx 19’’ Rack with up to 4 switches and Redundant power
supply

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1.3 DS Agile H38x
The DS Agile H38x is a range of standalone Ethernet Switches embedded with the Parallel
Redundancy Protocol (PRP according to IEC 62439-3) to provide redundancy of
communications. The product also supports the Precision Time Protocol (PTP) according to
IEEE 1588 v2 to provide highly accurate time synchronisation.
The range provides managed switches that are easy to install and operate. They are
designed to work in an electrical plant environment where standards such as IEC 61000-4 &
IEC 60255-5 apply.
The switch allows up to three devices (end node equipments) with 10Base-Tx or 100Base-
Tx electrical Ethernet interfaces to connect to a PRP network to which the interface is a
parallel 100Base-Fx fibre-optic Ethernet connection.
These are plug-and-play devices. They can run with the factory settings, but you should
configure them to your application. To do this you send commands via a terminal emulation
package on a connected personal computer or similar device.

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2. SAFETY AND HANDLING
This Safety Section and the relevant equipment documentation provide full information on
safe handling, commissioning and testing of this equipment.
The technical data in this Safety Section is typical only. See the technical data section of the
relevant equipment documentation for data specific to a particular piece of equipment.
Before carrying out any work on the equipment, you should be familiar with the
contents of this Safety Section and the ratings on the equipment’s rating label.
Reference should be made to the external connection diagram before the equipment is
installed, commissioned or serviced.
2.1 Health and safety
The information in the Safety Section of the equipment documentation is intended to ensure
that the equipment is properly installed and handled in order to maintain it in a safe
condition.
It is assumed that everyone who will be associated with the equipment will be familiar with
the contents of this Safety Section.
When electrical equipment is in operation, dangerous voltages will be present in certain parts
of the equipment. Failure to observe warning notices, incorrect use, or improper use may
endanger personnel and equipment and also cause personal injury or physical damage.
Before working on the equipment it must first be electrically isolated.
Proper and safe operation of the equipment depends on appropriate shipping and handling,
proper storage, installation and commissioning, and on careful operation, maintenance and
servicing. For this reason 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
of the system to which it is being connected;
−Are trained in the care and use of safety apparatus in accordance with safety
engineering practices;
−Are trained in emergency procedures (first aid).
The equipment documentation gives instructions for its installation, commissioning, and
operation. However, the manuals cannot cover all conceivable circumstances or include
detailed information on all topics. In the event of questions or specific problems, do not take
any action without proper authorization. Contact the appropriate Alstom technical sales office
and request the necessary information.

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2.2 Symbols
For safety reasons the following symbols which may be used on the equipment or referred to
in the equipment documentation, should be understood before it is installed or
commissioned.
Caution: refer to equipment documentation Caution: risk of electric shock
Protective Conductor (*Earth) terminal Functional/Protective Conductor
(*Earth) terminal
Note: This symbol may also be used
for a Protective Conductor
(Earth) terminal if that terminal
is part of a terminal block or
sub-assembly e.g. power
supply.
*NOTE: THE TERM EARTH USED THROUGHOUT THIS TECHNICAL
MANUAL IS THE DIRECT EQUIVALENT OF THE NORTH
AMERICAN TERM GROUND.
2.3 Installing, commissioning and servicing
Equipment connections
Personnel undertaking installation, commissioning or servicing work for this
equipment should be aware of the correct working procedures to ensure safety.
The equipment documentation should be consulted before installing,
commissioning, or servicing the equipment.
Terminals exposed during installation, commissioning and maintenance may
present a hazardous voltage unless the equipment is electrically isolated.
Any disassembly of the equipment may expose parts at hazardous voltage, also
electronic parts may be damaged if suitable electrostatic voltage discharge (ESD)
precautions are not taken.
If there is unlocked access to the rear of the equipment, care should be taken by
all personnel to avoid electric shock or energy hazards.
The equipment must be connected in accordance with the appropriate connection
diagram.
Protection Class I Equipment
- Before energizing the equipment it must be earthed using the protective
conductor terminal, if provided, or the appropriate termination of the
supply plug in the case of plug connected equipment.
- The protective conductor (earth) connection must not be removed since
the protection against electric shock provided by the equipment would be
lost.
- When the protective (earth) conductor terminal (PCT) is also used to
terminate cable screens, etc., it is essential that the integrity of the
protective (earth) conductor is checked after the addition or removal of
such functional earth connections. For M4 stud PCTs the integrity of the
protective (earth) connections should be ensured by use of a locknut or
similar.
The recommended minimum protective conductor (earth) wire size is 2.5 mm²
(3.3 mm² for North America) unless otherwise stated in the technical data section

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of the equipment documentation, or otherwise required by local or country wiring
regulations.
The protective conductor (earth) connection must be low-inductance and as short
as possible.
Before energizing the equipment, the following should be checked:
- Voltage rating/polarity (rating label/equipment documentation);
- Protective fuse rating;
- Integrity of the protective conductor (earth) connection (where
applicable);
- Voltage rating of external wiring, applicable to the application.
Equipment use
If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
Equipment operating conditions
The equipment should be operated within the specified electrical and
environmental limits.
Insulation and dielectric strength testing
Insulation testing may leave capacitors charged up to a hazardous voltage. At
the end of each part of the test, the voltage should be gradually reduced to zero,
to discharge capacitors, before the test leads are disconnected.
Insertion of modules and PCB cards
Modules and PCB cards must not be inserted into or withdrawn from the
equipment whilst it is energized, since this may result in damage.
Fibre optic communication
Where fibre optic communication devices are fitted, these should not be viewed
directly. Optical power meters should be used to determine the operation or
signal level of the device.
Cleaning
The equipment may be cleaned using a lint-free cloth dampened with clean water,
when no connections are energized. Contact fingers of test plugs are normally
protected by petroleum jelly, which should not be removed.
2.4 De-commissioning and disposal
De-commissioning
The supply input (auxiliary) for the equipment may include capacitors across the
supply or to earth. To avoid electric shock or energy hazards, after completely
isolating the supplies to the equipment (both poles of any dc supply), the
capacitors should be safely discharged via the external terminals prior to de-
commissioning.
Disposal
It is recommended that incineration and disposal to water courses is avoided.
The equipment should be disposed of in a safe manner. Any equipment
containing batteries should have them removed before disposal, taking
precautions to avoid short circuits. Particular regulations within the country of
operation, may apply to the disposal of the equipment.

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2.5 Technical specifications for safety
Unless otherwise stated in the equipment technical manual, the following data is applicable.
2.5.1 Protective fuse rating
The recommended maximum rating of the external protective fuse for equipments is 16A,
high rupture capacity (HRC) Red Spot type NIT, or TIA, or equivalent. The protective fuse
should be located as close to the unit as possible.
2.5.2 Protective class
EN 60950-1: 2006 Class I (unless otherwise specified in the
equipment documentation). This equipment
requires a protective conductor (earth) connection
to ensure user safety.
2.5.3 Installation category
EN 60950-1: 2006 Installation category II (Overvoltage Category II):
Distribution level, fixed installation.
Equipment in this category is qualification tested at
2 kV peak, 1.2/50 µs, 500 Ω, 0.5 J, between all
supply circuits and earth and also between
independent circuits.
2.5.4 Environment
The equipment is intended for indoor installation and use only. If it is required for use in an
outdoor environment then it must be mounted in a specific cabinet or housing allowing it to
meet the requirements of IEC 60529 with the classification of degree of protection IP54 (dust
and splashing water protected).
Pollution Degree - Pollution Degree 2 Compliance is demonstrated by reference to safety
Altitude - Operation up to 2000m standards.
EN 60950-1: 2006
2.6 Handling of Electronic Equipment
A person’s normal movements can easily generate electrostatic potentials of several
thousand volts.
Discharge of these voltages into semiconductor devices when handling circuits can cause
serious damage, which often may not be immediately apparent but the reliability of the circuit
will have been reduced.
The electronic circuits of Alstom products are immune to the relevant levels of electrostatic
discharge when housed in their cases. Do not expose them to the risk of damage by
withdrawing modules unnecessarily.
Each module incorporates the highest practical protection for its semiconductor devices.
However, if it becomes necessary to withdraw a module, the following precautions should be
taken in order to preserve the high reliability and long life for which the equipment has been
designed and manufactured.
1. Before removing a module, ensure that you are at the same electrostatic potential as
the equipment by touching the case.
1. Handle the module by its front-plate, frame, or edges of the printed circuit board. Avoid
touching the electronic components, printed circuit track or connectors.
2. Do not pass the module to any person without first ensuring that you are both at the
same electrostatic potential. Shaking hands achieves equipotential.
3. Place the module on an antistatic surface, or on a conducting surface that is at the
same potential as you.
4. Store or transport the module in a conductive bag.

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More information on safe working procedures for all electronic equipment can be found in
IEC 60147-0F and BS5783.
If you are making measurements on the internal electronic circuitry of any equipment in
service, it is preferable that you are earthed to the case with a conductive wrist strap.
Wrist straps should have a resistance to ground between 500k – 10M Ohms. If a wrist strap
is not available you should maintain regular contact with the case to prevent the build up of
static. Instruments used for making measurements should be earthed to the case whenever
possible.
Alstom strongly recommends that detailed investigations on the electronic circuitry, or
modification work, should be carried out in a Special Handling Area such as described in IEC
60147-0F or BS5783.
2.7 Packing and Unpacking
All DS Agile Hxxx devices are packaged separately in their own cartons and shipped inside
outer packaging. Use special care when opening the cartons and unpacking the device, and
do not use force. In addition, make sure to remove from the inside carton the supporting
documents supplied with each individual device and the type identification label.
The design revision level of each module included with the device in its as-delivered
condition can be determined from the list of components. This list should be carefully saved.
After unpacking the device, inspect it visually to make sure it is in proper mechanical
condition.
If the DS Agile Hxxx device needs to be shipped, both inner and outer packaging must be
used. If the original packaging is no longer available, make sure that packaging conforms to
ISO 2248 specifications for a drop height ≤0.8m.
2.8 Guarantees
The media on which you received Alstom software is guaranteed not to fail executing
programming instructions, due to defects in materials and workmanship, for a period of 90
days from date of shipment, as evidenced by receipts or other documentation. Alstom will, at
its option, repair or replace software media that do not execute programming instructions if
Alstom receive notice of such defects during the warranty period. Alstom does not guarantee
that the operation of the software shall be uninterrupted or error free.
A Return Material Authorization (RMA) number must be obtained from the factory and clearly
marked on the package before any equipment acceptance for guarantee work. Alstom will
pay the shipping costs of returning to the owner any parts that are covered by warranty.
Alstom believes that the information in this document is accurate. The document has been
carefully reviewed for technical accuracy. In the event that technical or typographical errors
exist, Alstom reserves the right to make changes to subsequent editions of this document
without prior notice to holders of this edition. The reader should consult Alstom if errors are
suspected. In no event shall Alstom be liable for any damages arising from or related to this
document or the information contained in it.
Except as specified herein, Alstom makes no guarantees, express or implied and specifically
disclaims any guarantee of merchantability or suitability for a particular purpose. Customer's
rights to recover damages caused by fault or negligence on the part Alstom shall therefore
be limited to the amount paid by the customer. Alstom will not be liable for damages resulting
from loss of data, profits, use of products or incidental or consequential damages even if
advised of the possibility thereof. This limitation of the liability of Alstom will apply regardless
of the form of action, whether in contract or tort, including negligence. Any action against
Alstom must be brought within one year after the cause of action accrues. Alstom shall not
be liable for any delay in performance due to causes beyond its reasonable control. The
warranty provided herein does not cover damages, defects, malfunctions, or service failures
caused by owner's failure to follow Alstom installation, operation, or maintenance
instructions, owner's modification of the product; owner's abuse, misuse, or negligent acts;
and power failure or surges, fire, flood, accident, actions of third parties, or other events
outside reasonable control.

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2.9 Copyrights & Trademarks
2.9.1 Copyrights
Under the copyright laws, this publication may not be reproduced or transmitted in any form,
electronic or mechanical, including photocopying, recording, storing in an information
retrieval system, or translating, in whole or in part, without the prior written consent of
Alstom.
2.9.2 Trademarks
DS Agile, DS Agile SCE, DS Agile ES, DS Agile OI, DS Agile SMT, Alstom - are trademarks
of Alstom. Product and company names mentioned herein are trademarks or trade names of
their respective companies.
2.9.3 Warnings regarding use of Alstom products
Alstom products are not designed with components and testing for a level of reliability
suitable for use in connection with surgical implants or as critical components in any life
support systems whose failure to perform can reasonably be expected to cause significant
injuries to a human.
In any application, including the above reliability of operation of the software products can be
impaired by adverse factors, including - but not limited to - fluctuations in electrical power
supply, computer hardware malfunctions, computer operating system malfunctions, software
suitability, suitability of compilers and development software used to develop an application,
installation errors, software and hardware compatibility problems, malfunctions or failures of
electronic monitoring or control devices, transient failures of electronic systems (hardware
and/or software), unanticipated uses or misuses, or errors by the user or application
designer (adverse factors such as these are collectively termed "System failures").
Any application where a system failure would create a risk of harm to property or persons
(including the risk of bodily injuries and death) should not be reliant solely upon one form of
electronic system due to the risk of system failure to avoid damage, injury or death, the user
or application designer must take reasonable steps to protect against system failure,
including - but not limited - to back-up or shut-down mechanisms, not because the end-
user's system is customized and differs from Alstom testing platforms but also because a
user or application designer may use Alstom products in combination with other products.
These actions cannot be evaluated or contemplated by Alstom. Thus, the user or application
designer is ultimately responsible for verifying and validating the suitability of Alstom
products whenever they are incorporated in a system or application, even without limitation
of the appropriate design, process and safety levels of such system or application.

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3. FUNCTIONAL DESCRIPTION
The H38x enables Ethernet equipped devices to connect via a Parallel Redundancy Protocol
(PRP in accordance with IEC 62439-3). Devices connect to the switch by electrical
connections using RJ45 connectors. These connections comply with 10/100Base-Tx. Three
ports are provided. Each port, independently, detects the speed of the connected device
(10Mbps or 100Mbps) and whether the link is half-duplex or full-duplex. It then automatically
adjusts the port configuration to suit.
Electrical Ethernet links are limited in distance and subject to interference. You should keep
them as short as possible.
The Parallel Redundancy Protocol connection uses fibre-optic inter-switch connections. A
multi-mode fibre-optic version is available for short distance connections (typically up to
around 2km), and a single-mode version is available for longer distances (potentially in
excess of 15km). The PRP ports support 100Base-Fx using LC connectors.
Providing Ethernet redundancy, the product can be described as a redundancy box, called a
“RedBox”.
The product also supports Network Time Protocol (NTP), as well as the Precision Time
Protocol (PTP in accordance with IEEE 1588 v2), to provide real-time synchronisation.
The figure below shows the main functional blocks of the product.
FIGURE 1: DS AGILE H38X FUNCTIONAL DIAGRAM
3.1 Parallel Redundancy Protocol (PRP)
The Parallel Redundancy Protocol (PRP) is implemented according to the definition in the
standard IEC 62439-3.
PRP allows seamless (sometimes called “bumpless”) communication in the face of a single
network disruption (for instance cable, driver, switch or controller failure).
A PRP compatible device has two ports operating in parallel, each port being connected to a
separate local area network (LAN) segment. IEC62439-3 assigns the term DANP (Doubly
Attached Node running PRP) to such devices. Critical devices should be doubly attached
using two ports.

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The figure below shows an example of a PRP network. The doubly attached nodes DANP 1
and DANP 2 have full node redundancy, while the singly attached nodes SAN 1 and SAN 4
do not have any redundancy. Singly attached nodes can, however, be connected to both
LANs, via a device that converts a singly attached node into a doubly attached node. This
product does that. A device that performs this function can be referred to as a RedBox (a
contraction of redundancy box).
Devices with single network cards such as personal computers, printers, etc., are singly
attached nodes (SAN) that may be connected into the PRP network via a RedBox as shown
in the figure below. This is the case for SAN2 and SAN3. Because these SANs connect to
both LANs, they can be considered as Virtual Doubly Attached Nodes and described as
VDANs.
LAN A Switch LAN B Switch
DANP 2RedBoxDANP 1
SAN 1 SAN 4SAN 2 SAN 3
S1031ENa
FIGURE 2: EXAMPLE PRP REDUNDANT NETWORK
To achieve high-availability configuration the first interface is connected to LAN A and the
second to LAN B. The topologies of LAN A and LAN B are open and the networks could be
applying other redundancy approaches. A DANP transmits its packets on both interfaces and
hence over both networks. In an error-free environment a second DANP receives the same
packets on both interfaces, possibly with a time delay between them. The receiving DANP
will use the first of these packets, ignoring the second. PRP networks do not need
reconfiguration nor path switching.
The two LANs are identical in protocol at the Media Access Control (MAC) level, but they
can differ in performance and topology. Transmission delays may also be different. The
LANs have no direct connection between them and they are assumed to be fail-independent.
3.2 Base-Tx Ethernet Switch function
The Base-Tx Ethernet Switch function manages three Ethernet ports presented for user
connection using RJ45 connectors. These are qualified by LED indications of link activity.
If a cable is not connected to a port, most of the circuitry for that port is disabled to save
power.
Using auto-negotiation, the product automatically determines the speed of transmission on
the 10/100 Base-Tx ports according to the IEEE 802.3u standard. It also determines
whether communication is half-duplex or full-duplex, and adapts accordingly.
Each Ethernet device inserts its unique “MAC address” into each message it sends. The
receiving port automatically recognises the MAC address in a received frame and stores it.
Once an address is recognised and stored, the switch will forward frames to the appropriate
port. Up to 1024 MAC addresses can be stored and monitored at any time.

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This product supports the store and forward mechanism of the IEEE 802.3 standard. It
forwards messages with known addresses to the appropriate port. Messages with unknown
addresses, broadcast messages, and multicast messages are forwarded out to all ports
except the source port. It does not forward error packets or 802.3x pause frames.
3.3 SNMP Management
Simple Network Management Protocol (SNMP) is the network protocol developed to manage
devices on an IP network. SNMP is based on a model consisting of a manager, an agent, a
database of management information, managed objects and the network protocol. The
manager provides the interface between the human network manager and the management
system. The agent provides the interface between the manager and the physical device(s)
being managed according to the figure below.
Board
SNMP Agent
Manager
(MIB Browser software)
Management
Database
Network protocol
Messages
Management
Database
HMI
S1032ENa
FIGURE 3: SNMP MANAGEMENT
The manager and agent use a Management Information Base (MIB) and a relatively small
set of commands to exchange information. The MIB is organised in a tree structure with
individual variables, such as point status or description, being represented as leaves on the
branches. A long numeric tag known as an Object IDentifier (OID) is used to distinguish each
variable uniquely in the MIB and in the SNMP messages. The Manager is an MIB Browser
Software. SNMP versions 1, 2, and 3 are supported.
Each SNMP element manages specific objects with each object having specific
characteristics. Each object/characteristic has a unique object identifier (OID) consisting of
numbers separated by decimal points (for example: 1.3.6.1.4.1.2682.1). The MIB associates
each OID with a readable label (for example: dpsRTUAState) and various other parameters
related to the object. The MIB then serves as a data dictionary or codebook that is used to
assemble and interpret SNMP messages.
For this product, the Alstom management information bases (MIB) use the following types of
object identifiers (OID):
−System
−Interface
−Remote network monitoring (RMON)
−Parallel redundancy protocol (PRP)
These are defined in the tables below.

H38x/EN GL/D11 Global Documentation
Page 16/53 DS Agile H38x
3.3.1 H38x System MIB Structure
Address Name
0 Ccitt
1 ISO
3 Org
6 DOD
1 Internet
2 mgmt
1 Mib-2
1 sys
1 sysDescr Redundant switch PRP
2 sysObjectID TBD
3 sysUpTime Time (in hundredths of a second)
since the switch was last
reinitialised
4 sysContact user-configurable
5 sysName SRP2xx (user-configurable)
6 sysLocation user-configurable
7 sysServices 2
3.3.2 H38x Interface MIB Structure
Address Name
0 Ccitt
1 ISO
3 Org
6 DOD
1 Internet
2 mgmt
1 Mib-2
2 interfaces Interface number
1 ifNumber Redundant switch PRP
2 ifTable TBD
1 ifEntry Time (in hundredths of a second)
since the switch was last
reinitialised
7 ifAdminStatus 1: up, 2: down
8 ifOperStatus 1: up, 2: down
9 ifLastChange time (in hundredths of a second)
since the latest change