YOKOGAWA GRVSW-660FA Manual

Technical
Information
Network Switch for Vnet/IP
TI 30A10A30-01E
TI 30A10A30-01E
©Copyright Sep. 2011 (YK)
5th Edition Dec. 2016 (YK)
Yokogawa Electric Corporation
2-9-32, Nakacho, Musashino-shi, Tokyo, 180-8750 Japan
Tel.: 81-422-52-5634 Fax.: 81-422-52-9802

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TI 30A10A30-01E
Introduction
Yokogawa has started providing reliable industrial network switches for Vnet/IP based on a new
policy of “Yokogawa Certified Buyout.” These network switches, categorized as “Recommended
products,” are supplied with the default configurations customized for Vnet/IP and they are
referred to as the “Recommended Switch” in this document. The Recommended Switches
consist of two types of switches; one is “Managed” and the other is “Unmanaged.” Whenever the
word “Recommended Switche(s)” is used, both types are referred to in this document.
Please use these Recommended Switches to establish a Vnet/IP network.
All the Recommended Switches are dedicated for Vnet/IP. Refrain from using them as Ethernet
switches for non-Vnet/IP network such as an information bus.
This document is provided for those who have basic understanding of the Vnet/IP systems, and
contains the functions and specifications of the Recommended Switches. Read this document
thoroughly before configuring the Vnet/IP network and refer to the user’s manual attached to the
devices to obtain detailed information as well as to use them safely.
For details about Vnet/IP and how to set up a network, please refer to the following related
document.
Related document
TI 30A10A05-01E Vnet/IP Network Construction Guide
Drawing Conventions
Some of the drawings may be partially emphasized, simplified, or omitted, for the convenience of
descriptions.
Symbols in this Book
This book has the following symbols.
WARNING
Indicates precautions to avoid a danger that may lead to death or severe injury.
CAUTION
Indicates precautions to avoid a danger that may lead to minor or moderate injury or
property damage.
IMPORTANT
Identifies important information required to understand the operations or functions.
TIP
Identifies additional information.
SEE
ALSO
Identifies a source to be referred to.
Dec. 26, 2016-00

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TI 30A10A30-01E
All Rights Reserved Copyright © 2010, Yokogawa Electric Corporation
Trademark Acknowledgments
• Vnet/IP is a registered trademark of YOKOGAWA
• Ethernet is a registered trademark of Xerox Corporation.
• All other company and product names mentioned in this document are trademarks or
registered trademarks of their respective companies.
• We do not use TM or ® mark to indicate those trademarks or registered trademarks in this
document.
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TI 30A10A30-01E
Network Switch for Vnet/IP
Dec. 26, 2016-00
CONTENTS
1. Overview.................................................................................................... 1-1
1.1 Recommended Switch Models........................................................................ 1-3
1.1.1 Managed Switches ............................................................................ 1-3
1.1.2 Unmanaged Switch............................................................................ 1-4
1.1.3 How to use Unmanaged Switch ........................................................ 1-5
1.2 SFP Module........................................................................................................ 1-7
1.3 Auto-ConfigurationAdapter(ACA)................................................................. 1-8
1.4 Terminal Cable................................................................................................... 1-8
2. HardwareSpecifications ........................................................................ 2-1
2.1 RS40 Family....................................................................................................... 2-1
2.1.1 Name of Each Part and Descriptions................................................. 2-1
2.1.2 Mounting ............................................................................................ 2-3
2.1.3 External Dimensions.......................................................................... 2-3
2.2 MACH104 Family .............................................................................................. 2-4
2.2.1 Name of Each Part and Descriptions................................................. 2-4
2.2.2 Mounting ............................................................................................ 2-6
2.2.3 External Dimensions.......................................................................... 2-6
2.3 MAR1040 Family ............................................................................................... 2-7
2.3.1 Name of Each Part and Descriptions................................................. 2-7
2.3.2 Mounting .......................................................................................... 2-11
2.3.3 External Dimensions........................................................................ 2-11
2.4 SPIDERIIFamily(UnmanagedSwitch) ........................................................ 2-12
2.4.1 Name of Each Part and Descriptions............................................... 2-12
2.4.2 Mounting .......................................................................................... 2-14
2.4.3 External Dimensions........................................................................ 2-14
2.5 Hardware Information..................................................................................... 2-15
2.5.1 Hardware Specification List ............................................................. 2-15
2.5.2 Wiring to Terminal Block .................................................................. 2-16
3. ConfigurationBackup/Restore............................................................... 3-1
3.1 ConfigurationFileArchitecture....................................................................... 3-1
3.2 ConfigurationBackuptoACA ......................................................................... 3-2
3.3 RestoreconfigurationfromACA..................................................................... 3-2
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TI 30A10A30-01E
4. ConfigurationSetup................................................................................. 4-1
4.1 Preparationforsetting ..................................................................................... 4-1
4.2 SummaryofCommandLineInterface(CLI) .................................................. 4-3
4.3 CLI command .................................................................................................... 4-5
4.3.1 Confirm configuration (show running-config) .................................... 4-5
4.3.2 Confirm system information (show sysinfo)....................................... 4-6
4.3.3 Confirm port status (show port all)..................................................... 4-8
4.3.4 Restore to default (clear config factory)........................................... 4-10
4.3.5 Save/Backup configuration (copy)................................................... 4-10
4.3.6 Port Disable for unused port (shutdown) ......................................... 4-11
4.3.7 Set management IP address (network parms)................................ 4-11
4.3.8 Cascaded domain connection by L3SW ......................................... 4-12
4.3.9 Configuring a ring network............................................................... 4-16
Appendix1.Defaultconfiguration ............................................................ App.1-1
Appendix2.VLAN-basedrouting.............................................................. App.2-1
Appendix3.ReuseofExistingMultimodeOpticalFiberCable............. App.3-1
Appendix4.PrecautionsforLong-haulOpticalFiberConnection ....... App.4-1
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1. Overview 1-1
TI 30A10A30-01E
1. Overview
ARecommendedSwitchisanetworkcomponentinaVnet/IPsystemtoconnectVnet/IP
stations. This section describes features of the Recommended Switches.
Features of Recommended Switches
• Yokogawa certified Buyout equipment for Vnet/IP
• Stable supply of the tested models
• Customized default configuration for Vnet/IP
• Service by Yokogawa engineer (*1)
*1: Yokogawa service engineers support the Recommended Switch in case it is used for Vnet/IP. Use it only for Vnet/IP, as other
network connection is not guaranteed or supported.
Categories of Recommended Switches
Two types of the recommended Switches are available.
• Managed Switch
A managed switch has configuration function and self-diagnostic function so that it can be
placed anywhere on the Vnet/IP network.
• Unmanaged Switch
An unmanaged switch is not equipped with either configuration function or self-diagnostic
function so that it can be placed only on the edge of the Vnet/IP network.
Please refer to “1.1.3 How to use Unmanaged Switch” for more details.
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1. Overview 1-2
TI 30A10A30-01E
ModelsandcustomizeddefaultconfigurationsofRecommended
Switches
Both Layer2 switch (L2SW) and Layer3 switch (L3SW) models are lined up as the
Recommended Switches.
L2SW is a device to connect stations and modules within a Vnet/IP domain.
L3SW is used for connecting Vnet/IP domains. Several models are available by input power type
and port variation type.
The Recommended Switches are customized with the default configuration (*2) to be dedicatedly
used in Vnet/IP networks. For any of a typical Vnet/IP network, the Recommended Switches
require no initial settings. (*1)
*1: The default parameters of the Recommended Switch are shown in Appendix 1.
Recommended L3SW has two configuration models for BUS1 or BUS2. Recommended L2SW has an identical configuration
model for BUS1 and BUS2.
*2: The default configuration is available only for the managed switches. The Unmanaged Switch does not have configuration
parameters.
Accessories for Recommended Switches
Following accessories are provided as optional for the Recommended Switches.
• SFP module
An SFP module is an optical transceiver to connect the Recommended Switches with an
optical fiber.
• Auto Configuration Adapter (ACA)
ACA is a USB memory for the Recommended Switches for saving/loading configurations
when changing the default configuration.
• Terminal cable for configuration
A terminal cable is for changing the configuration or checking the device status of the
Recommended Switch.
Note: An AC power cable for local regions is not included in the Recommended Switch.
An applicable AC power cable has to be prepared locally.
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1. Overview 1-3
TI 30A10A30-01E
1.1 Recommended Switch Models
1.1.1 Managed Switches
The list of Managed Switches is shown as below.
Table List of Managed Switches
Layer Vnet/IP
BUS
MS-Code
(Vendermodelname)
Product
Family
Ports Power
Supply Operating
Temp.(°C) Mounting
RJ-45 SFP P1 P2
L2SW BUS1
BUS2
GRVSW-660FA
(RS40-0009CCCCEDBPYY) RS40 9(4) DC DC -40 to +70 DIN Rail
GRVSW-663FA
(MACH104-20TX-F) MACH104 24 (4)
AC –
0 to +50 19” Rack
(1RU)
GRVSW-664FA
(MACH104-20TX-FR) AC AC
GRVSW-665FA
(MAR1040-
4C4C4C4C9999EM9HPYY)
MAR1040
16 (16)
AC –
-40 to +70 19” Rack
(1RU)
GRVSW-666FA
(MAR1040-
4C4C4C4C9999EMMHPYY)
AC AC
GRVSW-667FA
(MAR1040-
4C4C4C4C9999ELLHPYY)
DC DC
L3SW
BUS1
GRVSW-668FA
(MAR1040-
4C4C4C4C9999EM9HRY1)
16 (16)
AC –
-40 to +70 19” Rack
(1RU)
GRVSW-669FA
(MAR1040-
4C4C4C4C9999EMMHRY1)
AC AC
GRVSW-670FA
(MAR1040-
4C4C4C4C9999ELLHRY1)
DC DC
BUS2
GRVSW-671FA
(MAR1040-
4C4C4C4C9999EM9HRY2)
16 (16)
AC –
-40 to +70 19” Rack
(1RU)
GRVSW-672FA
(MAR1040-
4C4C4C4C9999EMMHRY2)
AC AC
GRVSW-673FA
(MAR1040-
4C4C4C4C9999ELLHRY2)
DC DC
Note: Each SFP port is for dual purpose (RJ-45/SFP) combo port.
When an SFP module is installed in a combo port, the port automatically serves as an SFP interface. (Combo port works as RJ-
45 or SFP interface exclusively.)
The Recommended Switches work in the same configuration for RJ-45 or SFP interface.
Note: An AC power cable is not included. Please prepare AC power cable allowed to be used in the local region.
Models of the Managed Switches are categorized in three product families of which images are
as shown below.
F010101.ai
RS40 Family MACH104 Family MAR1040 Family
Figure DeviceimagesbytheproductfamilyoftheManagedSwitches
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1. Overview 1-4
TI 30A10A30-01E
1.1.2 UnmanagedSwitch
The model of the Unmanaged Switch is as shown below.
Table List of Managed Switches
Layer Vnet/IPBUS MS-Code(Vender
modelname)
Product
Family
Ports PowerSupply Operating
Temp.(°C) Mounting
RJ-45 SFP P1 P2
L2SW BUS1,
BUS2
GR2SW-699FA
(SPIDER II Giga
5T/2S EEC)
SPIDER II 5 2 DC —-40 to +70 DIN Rail
Note: The SFP port is not for dual-purpose.
Ports No. 1 to 5 are for RJ-45 ports.
Ports No. 6 and 7 are for SFP ports
The product image of the Unmanaged Switch is as shown below.
F010103.ai
Figure DeviceimageoftheUnmanagedSwitch
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1. Overview 1-5
TI 30A10A30-01E Sep. 19, 2014-00
1.1.3 HowtouseUnmanagedSwitch
In order to simplify the drawings, BUS1 and BUS2 are drawn in a single line.
Concept
An Unmanaged Switch is not equipped with either configuration function or self-diagnostic
function so that it can be placed only on the edge of the Vnet/IP network.
Edge
Vnet/IP network
Edge
HIS/ENG/SENG
FCS/SCS
F010104.ai
Figure Vnet/IP network architecture
The edge of the Vnet/IP network is a point to connect Vnet/IP stations and a Vnet/IP network.
When an Unmanaged Switch place on the edge of a network fails, the failed part of the network
can be inferred by using Network Status Display Dialog Box in HIS.
Do not place an Unmanaged Switch on a point other than at an edge of a network because
analysis of network failure cannot be performed.
Applicablenetworkstructure
A local connection or an Edge-point connection is applicable to Unmanaged Switches.
F010102.ai
HIS HIS
GR2SW
Unmanaged Switch
other switch (*1)
FCSFCSENG/HIS
GR2SW
Unmanaged Switch Edge point
One connection to other switch
ENG/HIS
ENG/HIS
No switch is connected to GR2SW.
A switch of other kind is connected to GR2SW.
*1: Managed Switch or Unmanaged Switch
FigureApplicablenetworkstructure

1. Overview 1-6
TI 30A10A30-01E
Networkstructurenotapplicable
Other than the edge-point or local connection of the network is not applicable.
F010105.ai
HIS HIS
other switch (*1)
FCS
HIS HIS
Not Edge point
GR2SW
Unmanaged Switch
Two connections to other switches
ENG/HIS
ENG/HIS ENG/HIS
other switch (*1)
Connecting to two (or more) switches is not allowed.
1: Managed Switch or Unmanaged Switch
FigureNotapplicablenetworkstructure
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1. Overview 1-7
TI 30A10A30-01E
1.2 SFP Module
The SFP module is an optical transceiver to be installed in an SFP port of a Recommended
Switch when connecting to another Switch with an optical fiber cable.
SFP modules are hot-pluggable.
The following models are offered for Recommended Switches. Select SFP modules from this list.
Table SFP Modules for Recommended Switches
MS-Code
(Vendermodelname) Interface(*1) Nominal
Wavelength
Connectable
FiberType
(*2)
Link
Budget(*3)
Max.
Transmission
Distance(*4)
Operating
Temperature
GRVSFP-675FA
(M-SFP-LX/LC) 1000BASE-LX 1,310 nm Single Mode 0 to 8 dB 20 km 0 to 60°C
Multimode 0 to 8 dB 0.55 km
GRVSFP-676FA
(M-SFP-LX/LC EEC) 1000BASE-LX 1,310 nm Single Mode 0 to 8 dB 20 km –40 to +85°C
Multimode 0 to 8 dB 0.55 km
GRVSFP-696FA
(M-SFP-LH/LC) 1000BASE-LH 1,550 nm Single mode 6 to 20 dB 80 km
0 to 60°C
GRVSFP-697FA
(M-SFP-LH+/LC) 1000BASE-LH+ 1,550 nm Single mode 13 to 30 dB 120 km
GRVSFP-674FA
(M-FAST SFP-MM/LC) 100BASE-FX 1,310 nm Multimode 0 to 5 dB 4 km 0 to 60°C
*1: 1000BASE-LH and 1000BASE-LH+ are vendor-specific interfaces.
“-LH” stands for “Long-Haul”, which is a feature of an optical fiber connection.
*2: For Vnet/IP connections, single-mode optical fiber cables are recommended. When installing optical fiber cables for the first time,
use single-mode optical fiber cables that are compliant with the optical fiber category of IEC 60793-2-50 B1.1, ITU-T G652.B,
JIS C 6835 SSMA, or higher grade. When reusing existing multimode optical fiber cables, refer to Appendix 3, “Reuse of Existing
Multimode Optical Fiber Cable.”
*3: The total attenuation value, including loss of splicing and connector connections, at the nominal wavelength must be in the range
of the link budget.
*4: The maximum transmission distance depends on the performance of the fiber cables. For long-haul fiber connection exceeding
40 km in a domain, refer to Appendix 4, “Precautions for Long-haul Optical Fiber Connection.”
The appearance of the SFP module is shown below.
F010201.ai
Lock release lever
Figure SFP Module
To install an SFP module to an SFP port of a Recommended Switch, insert it into the port firmly
until it is locked. To detach the SFP module from the port, unplug the fiber cable, and then tilt the
lock release lever (see the figure above) down to the front and pull it to remove it.
The SFP module has an LC optical fiber connector. Carefully check the connector type of the
fiber cable to be used.
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1. Overview 1-8
TI 30A10A30-01E
1.3 Auto-ConfigurationAdapter(ACA)
ACA (MS-Code: GRVACA-677FA) is a USB memory for the Recommended Switch for saving/
loading the configuration to change from the default configuration.
If ACA is plugged-in, the Recommended Switch starts loading configuration automatically from
ACA during startup.
The configuration file can be backed-up on a file server, as the ACA is regarded as a USB
memory when connected to a computer.
ACA image is as shown below.
F010301.ai
Figure ACA image
For more information, see section 3.
1.4 Terminal Cable
A terminal cable (MS-Code: GRVCAB-678FA) is required for changing the configuration.
The terminal cable connects COM port of a computer to V.24 port of the Recommended Switch.
Command Line Interface (CLI) is available through the serial interface connection with VT100
compatible terminal software.
The Terminal Cable image is as shown below.
F010401.ai
Figure Terminal Cable image
For more information, see section 4.
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2.HardwareSpecications 2-1
TI 30A10A30-01E
2. HardwareSpecifications
2.1 RS40 Family
9ports,DINrailmountingmodel
GRVSW-660FA (Vender model name: RS40-0009CCCCEDBPYY): L2SW, DC x 2
2.1.1 NameofEachPartandDescriptions
F020101.ai
Power Input/FAULT output
Device status LEDs
DIP switch
USB interface
V.24 interface
Port status LED
Port 8
Port 1
Port 9
RJ-45 port
Grounding Screw
SFP port
Figure NameofEachPart(RS40Family)
Powerinput/FAULToutput
A 6-pin plug-in terminal block is installed to this connecter.
The terminal pin functions are as shown below.
Table TerminalPinFunction(RS40Family)
Pin Function
1P1 DC power input (+)
2FAULT output
3P1 DC power input (-)
4P2 DC power input (-)
5FAULT output
6P2 DC power input (+)
Sep. 19, 2014-00
F020104.ai
1 2 3 4 5 6
Ensure to connect 24 V DC power cable with the correct polarity.
This family of switches has redundant power supplies. Use both P1 and P2 power inputs unless
otherwise the power fail alarm will be set off on the device.
In case the device detects status error, two FAULT output pins will become open. The device
status error is triggered by power failure in the default configuration.
For more information about wiring to the terminal block, see section 2.4.2.
Figure Terminal Pins

2.HardwareSpecications 2-2
TI 30A10A30-01E
Device status LEDs
Four device status LED functions are as shown below.
Table DevicestatusLEDfunction(RS40Family)
LED name Reaction Device status
P (Power)
ON (Green) Normal operation
ON (Yellow) P1 or P2 power fail
OFF All power fail
FAULT ON (Red) Detect device status error (*1)
OFF Normal operation
RM (Ring Manager) (*2)
ON (Green) Ring normal
ON (Yellow) Ring error
OFF Ring function not active
Flash During ACA accessing
Stand by OFF Normal (Stand-by mode not enabled)
Flash During ACA accessing
*1: FAULT LED glows in red when FAULT output pins become open. (The default status as delivered from the factory.)
*2: These LEDs become functional when using ring network technology supported by the network switch vender.
DIP switch
This DIP switch defines HIPER-Ring operating priority.
Refrain from changing this DIP switch setting from the default.
The default setting is “RM = ON” and “Stand by = ON.”
USBinterface
An ACA is connected with the Recommended Switch via USB interface.
V.24 interface
V.24 interface is used to connect to a computer with terminal cable.
RJ-45port
RJ-45 port connects Vnet/IP stations or equipment with UTP cable. Ports 1 to 4 are for dual
purpose (RJ45/SFP) combo port.
The combo port will select SFP interface automatically when an SFP module is installed.
SFPport
SFP port has a plug-in slot for an SFP module.
Plug an SFP module into the slot to use Vnet/IP optical connection.
The SFP port is for dual purpose (RJ45/SFP) combo port.
The combo port will select SFP interface automatically when an SFP module is installed.
Port status LED
Port status LED glows in green during linkup and it flashes while receiving data.
Dec. 26, 2016-00

2.HardwareSpecications 2-3
TI 30A10A30-01E
Shielding ground
The front panel of the device is grounded via this ground screw.
For the ground conductor, use a cable with a cross section of at least 1.0 mm2.
2.1.2 Mounting
RS40 family device of the Recommended Switch is designed for mounting onto a 35 mm DIN rail
as shown in the figure below.
Attach the device’s upper snap-in guide into the DIN rail and press it down against the DIN rail
until it snaps into place.
F020102.ai
Figure MountingontheDINrail(RS40Family)
To take the RS40 family device off the DIN rail, insert a screwdriver horizontally under the
housing into the locking slide, pull it (without tipping the screw driver) downwards and lift the
device upwards.
2.1.3 ExternalDimensions
F020103.ai
105.313.73110.0
3.5
130.0
Unit: mm
Figure ExternalDimensions(RS40Family)
Dec. 26, 2016-00

2.HardwareSpecications 2-4
TI 30A10A30-01E
2.2 MACH104 Family
24ports,19-inchrackmountingmodel
GRVSW-663FA (Vender model name: MACH104-20TX-F): L2SW, AC x 1
GRVSW-664FA (Vender model name: MACH104-20TX-FR): L2SW, AC x 2
2.2.1 NameofEachPartandDescriptions
F020201.ai
V.24 interface
USB interface
FAULT output
Device status LEDs
SFP Port
RJ-45 Port
Port status LEDs
Power input (P1) Power input (P2)
Figure NameofEachPart(MACH104Family)
Powerinput(Inletsocket)
For AC power line input, MACH104 family of the Recommended Switch has one or two inlet
sockets conforming to EN60320 C14 standard. The redundant power unit model GRVSW-664FA
(Vender model name: MACH104-20TX-FR) has two inlet sockets for P1 and P2 AC power input.
An AC power cable is not included in the MACH104 family.
Please prepare AC power cable allowed to be used in the local region.
(The AC inlet socket fits to the connector conforming to IEC60320 C13 standard.)
For a redundant power unit model, use both P1 and P2 power inputs unless otherwise a power
fail alarm will be detected on this device.
FAULToutput
FAULT output has two contact pins.
The FAULT output pins become open when the device detects status error. The device status
error is triggered by power failure on the default configuration. For more information about wiring
to the terminal block, see section 2.4.2.
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2.HardwareSpecications 2-5
TI 30A10A30-01E
Device status LEDs
Four device status LED functions are as shown below.
Table DevicestatusLEDfunction(MACH104Family)
LED name Reaction Device status
P (Power)
ON (Green) Normal operation (*1)
ON (Yellow) P1 or P2 power fail
OFF All power fail
FAULT ON (Red) Detect device status error (*2)
OFF Normal operation
RM (Ring Manager) (*3)
ON (Green) Ring normal
ON (Yellow) Ring error
OFF Ring function not active
Flash During ACA accessing
Sb (Stand by) OFF Normal (Stand-by mode not enabled)
Flash During ACA accessing
*1: As for a single power model, the Power LED glows in green (Normal) or OFF (Fail).
*2: FAULT LED glows in red when FAULT output pins become open. (The default status as delivered from the factory.)
*3: These LEDs become functional when using ring network technology supported by the network switch vender.
USBinterface
An ACA is connected with the Recommended Switch via USB interface.
V.24 interface
V.24 interface connects a computer with a terminal cable.
RJ-45port
RJ-45 port connects Vnet/IP stations or equipment with UTP cable. Ports 5 to 8 are for dual
purpose (RJ45/SFP) combo port.
The combo port will select SFP interface automatically when an SFP module is installed.
SFPport
SFP port has a plug-in slot for an SFP module.
Plug the SFP module into the slot to use Vnet/IP optical connection. The SFP port is for dual
purpose (RJ45/SFP) combo port.
The combo port selects SFP interface automatically when the SFP module is installed.
Port status LED
Each port has 2-port status LEDs.
The LED on the left indicates link status. It glows in green during linkup.
The LED on the right indicates data access. It flashes in orange while receiving/sending data.
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2.HardwareSpecications 2-6
TI 30A10A30-01E
2.2.2 Mounting
MACH104 family device of the Recommended Switch is designed for mounting on a 19-inch rack
cabinet.
Measure the 19-inch rack’s depth to let a main cable and any power supply cables to fit from the
back, and the data cables from the front.
Install the sliding/mounting rails in the 19-inch switch cabinet as instructed by the manufacturer,
and make sure the device is resting on both rails to protect the device from vibrating.
MACH104 family device of the Recommended Switch is designed without a fan; however, it
requires sufficient ventilation. Provide a fan for the 19-inch rack, if necessary.
In order to prevent wrong network cable connections to the operating system, the cabinet must
be protected by a security lock key.
2.2.3 ExternalDimensions
F020202.ai
19.3 444.0 19.3
3.3 462.6 3.3
342.0
43.9 31.75
Unit: mm
Figure ExternalDimensions(MACH104Family)
Sep. 19, 2014-00
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