Brocade Communications Systems FastIron SX Manual

HARDWARE INSTALLATION GUIDE
Brocade FastIron SX Series Chassis
Hardware Installation Guide
Part Number: 53-1003613-04
Publication Date: 15 June 2017

© 2017, Brocade Communications Systems, Inc. All Rights Reserved.
Brocade, the B-wing symbol, and MyBrocade are registered trademarks of Brocade Communications Systems, Inc., in the United States and in other
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Notice: This document is for informational purposes only and does not set forth any warranty, expressed or implied, concerning any equipment,
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notice, and assumes no responsibility for its use. This informational document describes features that may not be currently available. Contact a Brocade
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The authors and Brocade Communications Systems, Inc. assume no liability or responsibility to any person or entity with respect to the accuracy of this
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The product described by this document may contain open source software covered by the GNU General Public License or other open source license
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obtain a copy of the programming source code, please visit http://www.brocade.com/support/oscd.
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Contents
Preface...................................................................................................................................................................................................................................7
Document conventions............................................................................................................................................................................................................................7
Notes, cautions, and warnings.....................................................................................................................................................................................................7
Text formatting conventions.........................................................................................................................................................................................................7
Command syntax conventions....................................................................................................................................................................................................8
Brocade resources.....................................................................................................................................................................................................................................8
Document feedback..................................................................................................................................................................................................................................8
Contacting Brocade Technical Support............................................................................................................................................................................................ 9
Brocade customers..........................................................................................................................................................................................................................9
Brocade OEM customers............................................................................................................................................................................................................. 9
About This Document..................................................................................................................................................................................................... 11
Supported Software............................................................................................................................................................................................................................... 11
What’s new in this document ............................................................................................................................................................................................................11
Overview.............................................................................................................................................................................................................................13
Hardware benets...................................................................................................................................................................................................................................13
Software features.....................................................................................................................................................................................................................................13
Supported congurations....................................................................................................................................................................................................................14
PoE and PoE+ applications....................................................................................................................................................................................................... 14
Hardware components..........................................................................................................................................................................................................................14
FSX 800 chassis........................................................................................................................................................................................................................... 15
FSX 1600 chassis........................................................................................................................................................................................................................ 17
Management modules................................................................................................................................................................................................................ 20
Switch fabric modules ................................................................................................................................................................................................................ 24
Interface modules..........................................................................................................................................................................................................................24
Network interfaces.........................................................................................................................................................................................................................34
Power supplies................................................................................................................................................................................................................................35
Cooling system...............................................................................................................................................................................................................................43
Built-in mounting brackets........................................................................................................................................................................................................ 44
FSX 1600 slot identication.....................................................................................................................................................................................................44
Installing FastIron SX Devices....................................................................................................................................................................................... 47
Unpacking the system.......................................................................................................................................................................................................................... 47
Installation precautions......................................................................................................................................................................................................................... 48
General precautions......................................................................................................................................................................................................................48
Lifting precautions.........................................................................................................................................................................................................................48
Power precautions and warnings............................................................................................................................................................................................ 48
Preparing the installation site..............................................................................................................................................................................................................50
Cabling infrastructure................................................................................................................................................................................................................... 50
Installation location........................................................................................................................................................................................................................50
Removing extra shipment screws (FSX 800 only)....................................................................................................................................................................50
Installing the chassis in a rack............................................................................................................................................................................................................51
Installing mounting brackets on the FSX 1600 chassis...............................................................................................................................................53
Removing the slot panels.................................................................................................................................................................................................................... 55
Installing management and interface modules...........................................................................................................................................................................55
Attaching a management station......................................................................................................................................................................................................62
Attaching a PC or terminal to the console port or 10/100/1000 copper port................................................................................................. 63
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Attaching a switch to an Ethernet port.................................................................................................................................................................................. 63
Powering on the system.......................................................................................................................................................................................................................63
Power cords..................................................................................................................................................................................................................................... 64
Power source interruptions........................................................................................................................................................................................................66
Connecting AC power to the chassis.....................................................................................................................................................................................67
Connecting DC power to the chassis....................................................................................................................................................................................70
Verifying proper operation...................................................................................................................................................................................................................75
Observing the LEDs.....................................................................................................................................................................................................................75
Displaying the module status................................................................................................................................................................................................... 78
Connecting Network Devices and Checking Connectivity...................................................................................................................................... 81
Overview.....................................................................................................................................................................................................................................................81
Assigning permanent passwords..................................................................................................................................................................................................... 81
Recovering from a lost password............................................................................................................................................................................................82
Conguring IP addresses.................................................................................................................................................................................................................... 83
IPv4 devices.................................................................................................................................................................................................................................... 83
IPv6 devices.................................................................................................................................................................................................................................... 85
Connecting network devices.............................................................................................................................................................................................................. 87
Cable specications......................................................................................................................................................................................................................87
Connecting to Ethernet or fast Ethernet hubs................................................................................................................................................................... 87
Connecting to workstations, servers, or routers................................................................................................................................................................88
Connecting a network device to a ber port on the Brocade device....................................................................................................................... 89
Automatic MDI or MDIX detection.........................................................................................................................................................................................90
Using a CX4 transceiver............................................................................................................................................................................................................. 90
Testing network connectivity.............................................................................................................................................................................................................. 92
Observing LEDs............................................................................................................................................................................................................................ 92
Troubleshooting network connections........................................................................................................................................................................................... 93
Support for digital optical monitoring....................................................................................................................................................................................94
Managing the Chassis and Modules.............................................................................................................................................................................95
Overview.....................................................................................................................................................................................................................................................95
Displaying chassis status and temperature readings...............................................................................................................................................................95
Managing the cooling system............................................................................................................................................................................................................99
Conguring the cooling system...............................................................................................................................................................................................99
Monitoring the cooling system..............................................................................................................................................................................................103
Displaying the Syslog conguration and static and dynamic buers.............................................................................................................................105
Static and dynamic buers..................................................................................................................................................................................................... 106
Syslog messages for PCI (hardware) errors..............................................................................................................................................................................106
Managing the switch fabric modules (FSX 800 and FSX 1600 only)..........................................................................................................................107
Displaying management module CPU usage.........................................................................................................................................................................107
Removing MAC address entries....................................................................................................................................................................................................107
Using a Redundant Management Module................................................................................................................................................................109
Overview..................................................................................................................................................................................................................................................109
How Management module redundancy works....................................................................................................................................................................... 109
Management module redundancy overview...................................................................................................................................................................109
Management module switchover.........................................................................................................................................................................................110
Switchover implications............................................................................................................................................................................................................111
Management module redundancy conguration................................................................................................................................................................... 112
Changing the default active chassis slot...........................................................................................................................................................................112
Managing management module redundancy..........................................................................................................................................................................112
File synchronization between the active and standby management modules................................................................................................. 112
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Manually switching over to the standby management module...............................................................................................................................115
Rebooting the active and standby management modules....................................................................................................................................... 115
Monitoring management module redundancy........................................................................................................................................................................115
Determining management module status....................................................................................................................................................................... 116
Displaying temperature information....................................................................................................................................................................................117
Displaying switchover information.......................................................................................................................................................................................117
Maintaining the Hardware............................................................................................................................................................................................ 119
Overview..................................................................................................................................................................................................................................................119
Hardware maintenance schedule.................................................................................................................................................................................................. 119
Cleaning the ber optic connectors..............................................................................................................................................................................................119
Replacing a management module................................................................................................................................................................................................120
Installation precautions.............................................................................................................................................................................................................120
Removing a management module......................................................................................................................................................................................120
Installing a new management module...............................................................................................................................................................................121
Replacing a switch fabric module (FSX 800 and FSX 1600 only)................................................................................................................................ 124
Removing a switch fabric module....................................................................................................................................................................................... 124
Installing a new switch fabric module.................................................................................................................................................................................124
Replacing an interface module.......................................................................................................................................................................................................128
Precautions....................................................................................................................................................................................................................................128
Before removing an interface module............................................................................................................................................................................... 128
Removing an interface module.............................................................................................................................................................................................129
Installing a new interface module.........................................................................................................................................................................................129
Disabling and re-enabling an interface module.............................................................................................................................................................131
Replacing a copper or ber optic module..................................................................................................................................................................................132
Removing a copper or ber optic module....................................................................................................................................................................... 132
Installing a new copper or ber optic module.................................................................................................................................................................133
Cabling a ber optic module..................................................................................................................................................................................................134
Installing or replacing a power supply......................................................................................................................................................................................... 134
Determining which power supply failed............................................................................................................................................................................ 134
Removing an AC power supply............................................................................................................................................................................................135
Removing a DC power supply..............................................................................................................................................................................................137
Installing a new power supply................................................................................................................................................................................................139
Connecting AC power to the chassis................................................................................................................................................................................. 143
Connecting DC power to the chassis.................................................................................................................................................................................144
Verifying proper operation...................................................................................................................................................................................................... 148
Displaying the status of the power supplies....................................................................................................................................................................149
Replacing the FSX 800 fan tray.................................................................................................................................................................................................... 149
Replacing the FSX 1600 fan assemblies..................................................................................................................................................................................152
Replacing the air lter in the FastIron SX-1600..................................................................................................................................................................... 154
Mean time between failure............................................................................................................................................................................................................... 155
Brocade FastIron SX Series Technical Specications............................................................................................................................................159
System specications.........................................................................................................................................................................................................................159
Ethernet....................................................................................................................................................................................................................................................159
LEDs..........................................................................................................................................................................................................................................................159
Other......................................................................................................................................................................................................................................................... 160
Weight and physical dimensions................................................................................................................................................................................................... 160
Environmental requirements........................................................................................................................................................................................................... 160
Power supply specications (per PSU).......................................................................................................................................................................................161
Power consumption (maximum conguration)........................................................................................................................................................................161
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Serial port specications (DB9)..................................................................................................................................................................................................... 162
Serial port specications (pinout RJ-45)....................................................................................................................................................................................162
Serial port specications (protocol)...............................................................................................................................................................................................162
Memory specications.......................................................................................................................................................................................................................162
Regulatory compliance (EMC)........................................................................................................................................................................................................163
Regulatory compliance (safety)...................................................................................................................................................................................................... 163
Regulatory compliance (environmental)..................................................................................................................................................................................... 163
Additional pinout and signaling information............................................................................................................................................................165
Console (serial RJ45) management port pinouts.................................................................................................................................................................. 165
10/100 and gigabit port pinouts..................................................................................................................................................................................................166
Cable specications...................................................................................................................................................................................................... 167
Regulatory Statements.................................................................................................................................................................................................169
CE Statement.........................................................................................................................................................................................................................................169
China ROHS.......................................................................................................................................................................................................................................... 169
BSMI statement (Taiwan)..................................................................................................................................................................................................................169
Canadian requirements......................................................................................................................................................................................................................170
China CC statement............................................................................................................................................................................................................................170
Europe and Australia (CISPR 22 Class A Warning)...............................................................................................................................................................171
FCC warning (US only)...................................................................................................................................................................................................................... 171
Germany.................................................................................................................................................................................................................................................. 171
KCC statement (Republic of Korea).............................................................................................................................................................................................. 171
VCCI statement.....................................................................................................................................................................................................................................171
Caution and Danger Notices....................................................................................................................................................................................... 173
Cautions...................................................................................................................................................................................................................................................173
General cautions......................................................................................................................................................................................................................... 173
Electrical cautions.......................................................................................................................................................................................................................174
Danger Notices..................................................................................................................................................................................................................................... 178
General dangers..........................................................................................................................................................................................................................179
Electrical dangers........................................................................................................................................................................................................................179
Dangers related to equipment weight................................................................................................................................................................................ 181
Laser dangers.............................................................................................................................................................................................................................. 182
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Preface
• Document conventions......................................................................................................................................................................................7
• Brocade resources............................................................................................................................................................................................... 8
• Document feedback............................................................................................................................................................................................8
• Contacting Brocade Technical Support.......................................................................................................................................................9
Document conventions
The document conventions describe text formatting conventions, command syntax conventions, and important notice formats used in
Brocade technical documentation.
Notes, cautions, and warnings
Notes, cautions, and warning statements may be used in this document. They are listed in the order of increasing severity of potential
hazards.
NOTE
A Note provides a tip, guidance, or advice, emphasizes important information, or provides a reference to related information.
ATTENTION
An Attention statement indicates a stronger note, for example, to alert you when trac might be interrupted or the device might
reboot.
CAUTION
A Caution statement alerts you to situations that can be potentially hazardous to you or cause damage to hardware,
rmware, software, or data.
DANGER
A Danger statement indicates conditions or situations that can be potentially lethal or extremely hazardous to you. Safety
labels are also attached directly to products to warn of these conditions or situations.
Text formatting conventions
Text formatting conventions such as boldface, italic, or Courier font may be used to highlight specic words or phrases.
Format Description
bold text Identies command names.
Identies keywords and operands.
Identies the names of GUI elements.
Identies text to enter in the GUI.
italic text Identies emphasis.
Identies variables.
Identies document titles.
Courier font Identies CLI output.
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Format Description
Identies command syntax examples.
Command syntax conventions
Bold and italic text identify command syntax components. Delimiters and operators dene groupings of parameters and their logical
relationships.
Convention Description
bold text Identies command names, keywords, and command options.
italic text Identies a variable.
value In Fibre Channel products, a xed value provided as input to a command option is printed in plain text, for
example, --show WWN.
[ ] Syntax components displayed within square brackets are optional.
Default responses to system prompts are enclosed in square brackets.
{ x | y | z } A choice of required parameters is enclosed in curly brackets separated by vertical bars. You must select
one of the options.
In Fibre Channel products, square brackets may be used instead for this purpose.
x | yA vertical bar separates mutually exclusive elements.
< > Nonprinting characters, for example, passwords, are enclosed in angle brackets.
... Repeat the previous element, for example, member[member...].
\ Indicates a “soft” line break in command examples. If a backslash separates two lines of a command
input, enter the entire command at the prompt without the backslash.
Brocade resources
Visit the Brocade website to locate related documentation for your product and additional Brocade resources.
White papers, data sheets, and the most recent versions of Brocade software and hardware manuals are available at www.brocade.com.
Product documentation for all supported releases is available to registered users at MyBrocade.
Click the Support tab and select Document Library to access product documentation on MyBrocade or www.brocade.com. You can
locate documentation by product or by operating system.
Release notes are bundled with software downloads on MyBrocade. Links to software downloads are available on the MyBrocade landing
page and in the Document Library.
Document feedback
Quality is our rst concern at Brocade, and we have made every eort to ensure the accuracy and completeness of this document.
However, if you nd an error or an omission, or you think that a topic needs further development, we want to hear from you. You can
provide feedback in two ways:
• Through the online feedback form in the HTML documents posted on www.brocade.com
• By sending your feedback to documentation@brocade.com
Provide the publication title, part number, and as much detail as possible, including the topic heading and page number if applicable, as
well as your suggestions for improvement.
Brocade resources
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Contacting Brocade Technical Support
As a Brocade customer, you can contact Brocade Technical Support 24x7 online or by telephone. Brocade OEM customers should
contact their OEM/solution provider.
Brocade customers
For product support information and the latest information on contacting the Technical Assistance Center, go to www.brocade.com and
select Support.
If you have purchased Brocade product support directly from Brocade, use one of the following methods to contact the Brocade
Technical Assistance Center 24x7.
Online Telephone
Preferred method of contact for non-urgent issues:
• Case management through the MyBrocade portal.
• Quick Access links to Knowledge Base, Community, Document
Library, Software Downloads and Licensing tools
Required for Sev 1-Critical and Sev 2-High issues:
• Continental US: 1-800-752-8061
• Europe, Middle East, Africa, and Asia Pacic: +800-AT FIBREE
(+800 28 34 27 33)
•Toll-free numbers are available in many countries.
• For areas unable to access a toll-free number:
+1-408-333-6061
Brocade OEM customers
If you have purchased Brocade product support from a Brocade OEM/solution provider, contact your OEM/solution provider for all of
your product support needs.
• OEM/solution providers are trained and certied by Brocade to support Brocade® products.
• Brocade provides backline support for issues that cannot be resolved by the OEM/solution provider.
• Brocade Supplemental Support augments your existing OEM support contract, providing direct access to Brocade expertise.
For more information, contact Brocade or your OEM.
• For questions regarding service levels and response times, contact your OEM/solution provider.
Contacting Brocade Technical Support
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About This Document
• Supported Software..........................................................................................................................................................................................11
• What’s new in this document .......................................................................................................................................................................11
Supported Software
For information about the features supported on a hardware platform, refer to the appropriate Features and Standards Support Matrix
document.
What’s new in this document
There are no enhancements in this edition.
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Overview
• Hardware benets..............................................................................................................................................................................................13
• Software features............................................................................................................................................................................................... 13
• Supported congurations...............................................................................................................................................................................14
• Hardware components....................................................................................................................................................................................14
This chapter contains an overview of the following FastIron X Series® Layer 2 or Layer 3 switches:
• FastIron SX 800 (FSX 800)
• FastIron SX 1600 (FSX 1600)
Designed for medium to large enterprise backbones, FastIron X Series chassis devices are modular switches that provide the enterprise
network with a complete end-to-end Enterprise LAN solution, from the wiring closet to the LAN backbone.
Hardware benets
FastIron X Series chassis devices provide the following benets:
• The FSX 800 and FSX 1600 management modules have a console port and a 10/100/1000 port that provide connectivity
to your existing management network.
• The FSX 800 and FSX 1600 management modules are interchangeable between devices. However, you cannot mix Second
Generation and Third Generation modules in the same device.
• Optional dual management modules on the FSX 800 and FSX 1600 provide full redundancy.
• The crossbar (xbar) architecture enables the management module to switch 30 Gigabits per second between each interface
module and within the management module to each of the fabrics.
• The interface modules and power supplies are interchangeable among all FastIron X Series chassis devices. However, you
cannot mix Second Generation and Third Generation modules in the same device.
• The FSX 800 and FSX 1600 management, switch fabric, and interface modules are hot swappable, which means you can
remove and replace them while the device is powered on and running.
• All FastIron X Series chassis devices have a passive backplane.
• FastIron X Series chassis devices have completely separate data and control planes for uncompromised switching performance,
increased reliability of both planes, and increased security of the control plane in the event of a Denial of Service (DoS) attack on
the data plane.
• FastIron X Series chassis devices have distributed data and control planes, which results in uncompromised wire-speed
performance for the data plane and faster and more ecient performance of management functions for the control plane.
• The SX-FI-ZMR modules will work with systems with all second generation packet processor modules or all third generation
packet processor modules. The SX-FI-2XMR modules will only work with all third generation packet processor modules.
Software features
Software features dier depending on the software version that is loaded on the device and the type of management module that is
installed in the device. Refer to the appropriate conguration guide for a complete list of software features supported on your device.
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Supported congurations
Premium FastIron X Series chassis devices support Layer 2 switching and full Layer 3 multiprotocol routing. Standard devices support
Layer 2 and base Layer 3 switching. All standard FastIron X Series chassis devices can be upgraded to full Layer 3 multi-protocol
routing, at which time they are considered to be premium devices.
For a list of supported modules and management modules refer to the “Management Modules” section.
All FastIron X Series chassis devices optionally support Power over Ethernet (PoE), providing the means for integrating data, voice, and
video over existing Ethernet cables.
TABLE 1 FastIron X Series supported congurations
Device Standard Premium (PREM) Power over Ethernet (PoE and PoE
+)
FSX 800 Yes Yes Yes (FI-SX-24-GPP and FI-
SX48GPP modules only)
FSX 1600 Yes Yes Yes (FI-SX-24-GPP and FI-
SX48GPP modules only)
PoE and PoE+ applications
Brocade FastIron X Series chassis devices with PoE and PoE+ provide Power over Ethernet, compliant with the standards described in
the IEEE 802.3af and 802.3at specication for delivering in-line power. The specications dene the standard for delivering power over
existing network cabling infrastructure, enabling multicast-enabled full streaming audio and video applications for converged services,
such as, Voice over IP (VoIP), WLAN access points, IP surveillance cameras, and other IP technology devices.
PoE technology eliminates the need for an electrical outlet and dedicated UPS near IP powered devices. With power sourcing devices,
such as Brocade’s FastIron X Series chassis devices with PoE and PoE+, power is consolidated and centralized in the wiring closets,
improving the reliability and resiliency of the network. Because PoE can provide power over Ethernet cable, power is continuous, even in
the event of a power failure.
For PoE port density, refer to PoE port density on page 43. For PoE+ port density, refer to PoE+ port density on page 43.
Hardware components
FastIron X Series chassis devices are composed of the following major hardware components:
• Chassis
• Management module, with optional dual management modules for full redundancy
• Separate switch fabric modules (FSX 800 and FSX 1600 only)
• Interface modules
• Power supplies
• In the FSX 800, a fan tray comprised of six fans and a fan control module
• In the FSX 1600, two fan trays at the rear of the chassis and an air lter in the bottom front of the chassis
• Built-in mounting brackets
The following sections provide more information about these components.
For details about physical dimensions, power supply specications, and pinouts, refer to the “Hardware Specications” section.
Supported congurations
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FSX 800 chassis
The FSX 800 chassis is six rack units in height and contains the following component slots:
• Two half slots for management modules
• Two half slots for switch fabric modules
• Eight half slots for interface modules
• Four slots for power supplies along the bottom of the card shelf. The power supply slots add a rack unit (RU) to the height of the
chassis.
FIGURE 1 FSX 800 chassis and component slots
The FSX 800 chassis ships from the factory with the following components installed:
• Two switch fabric modules
• A slot panel in each empty interface module slot and power supply slot. The slot panels ensure proper airow within the chassis.
• One AC power supply
• A fan tray assembly, which contains the cooling system for the chassis
Hardware components
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You can install the following components in the FSX 800 slots:
• Up to two management modules
• Up to eight single slot and up to 4 double slot interface modules
• Up to four AC or DC power supplies: two system (12-volt) power supplies and two PoE (52- 54-volt) power supplies
Before installing any modules or power supplies, you must remove the slot panel.
CAUTION
If you do not install a module or a power supply in a slot, you must keep the slot ller panel in place. If you run the chassis
with an uncovered slot, the system will overheat.
The gure below shows the FSX 800 slots where you install modules and power supplies, and the electrostatic discharge (ESD)
connector, into which you can plug an ESD wrist strap to ground yourself while handling and installing modules.
FIGURE 2 FSX 800 module slots
1. Slot 1
2. Slot 2
3. Slot 3
4. Slot 4
5. Slot 5
6. Slot 6
7. Slot 7
8. Slot 8
9. Slot 9
10. Slot 10
11. Switch Fabric Slot 1
12. Switch Fabric Slot 2
13. Fan tray
14. ESD connector
Hardware components
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DANGER
For safety reasons, the ESD wrist strap should contain a series 1 megaohm resistor.
FSX 1600 chassis
Part numbers for the FSX 1600 chassis and bundles begin with FI-SX-1600-xxx.
The FSX 1600 chassis is 14 rack units in height and contains the following component slots:
• Two half slots for management modules
• Two half slots for switch fabric modules
• Sixteen half slots for interface modules
• Eight slots for power supplies along the bottom of the card shelf
The following gure shows the front of the FSX 1600 device.
Hardware components
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FIGURE 3 FSX 1600 device
Hardware components
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FSX 1600 devices ship from the factory with the following components installed:
• Two switch fabric modules
• A slot panel in each empty interface module slot and power supply slot. The slot panel ensures proper airow within the chassis.
• Two AC power supplies
• A fan tray assembly, which contains the cooling system for the chassis
You can install the following components in the slots:
• Up to two management modules
• Up to 16 single slot and up to 8 double slot interface modules
• Up to eight AC or DC power supplies (four system (SYS) power supplies and four PoE power supplies)
Before installing any modules or power supplies, you must remove the slot panel.
CAUTION
If you do not install a module or a power supply in a slot, you must keep the slot ller panel in place. If you run the chassis
with an uncovered slot, the system will overheat.
FSX 1600 slot identication
The following gure identies the slots where you can install modules and power supplies as well as the electrostatic discharge (ESD)
connector, into which you can plug an ESD wrist strap to ground yourself while handling and installing modules.
DANGER
For safety reasons, the ESD wrist strap should contain a series 1 megaohm resistor.
Hardware components
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FIGURE 4 FSX 1600 slots
1. Interface slot 1
2. Interface slot 2
3. Interface slot 3
4. Interface slot 4
5. interface slot 5
6. Interface slot 6
7. Interface slot 7
8. Interface slot 8
9. Interface slot 9
10. Interface slot 10
11. Interface slot 11
12. Interface slot 12
13. Interface slot 13
14. Interface slot 14
15. Interface slot 15
16. Interface slot 16
17. Management slot 17
18. Management slot 18
19. Switch fabric slot 1
20. Switch fabric slot 2
21. ESD ground connector
Management modules
Each FSX 800 and FSX 1600 device requires one management module and as an option supports two management modules for full
redundancy. Each management module occupies one half slot.
Hardware components
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