Cisco Nexus 7706 Hardware Installation Manual
Cisco Nexus 7706 Hardware Installation Guide
First Published: 2013-12-24
Last Modified: 2014-06-19
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Text Part Number: OL-31330-01
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CONTENTS
PREFACE
CHAPTER 1
CHAPTER 2
Preface ix
Audience ix
Document Conventions ix
Documentation Feedback x
Obtaining Documentation and Submitting a Service Request xi
Overview 1
Overview of the Cisco Nexus 7706 Switch Installation Features 1
Preparing the Site 5
Humidity Requirements 5
Altitude Requirements 5
Dust and Particulate Requirements 6
Minimizing Electromagnetic and Radio Frequency Interference 6
Shock and Vibration Requirements 7
Grounding Requirements 7
CHAPTER 3
Planning for Power Requirements 7
Rack and Cabinet Requirements 10
Clearance Requirements 11
Installing the Switch Chassis 15
Installing a Rack or Cabinet 15
Unpacking and Inspecting a New Switch 16
Attaching Bottom-Support Rails to a Two-Post Rack 17
Attaching Bottom-Support Rails to a Four-Post Rack 19
Installing the Chassis in a Two-Post Rack 21
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Installing the Chassis on a Four-Post Rack or Cabinet 26
Grounding a Switch Chassis 31
Grounding the Front ID Door 33
Installing Cable Management Frames onto the Chassis 36
Attaching the Front Door to the Chassis 38
Installing Air Filters 40
CHAPTER 4
CHAPTER 5
Connecting to the Network 43
Guidelines for Connecting Ports 43
Connecting a Console to the Switch 44
Connecting the Management Interface 45
Creating the Initial Switch Configuration 46
Connecting Interface Ports to the Network 47
Connecting a Fiber-Optic Cable to a Transceiver 47
Disconnecting Optical Ports from the Network 48
Maintaining Transceivers and Optical Cables 48
Managing the Switch 51
Displaying Information About Installed Hardware Modules 51
Displaying the Hardware Inventory for a Switch 54
Displaying the Backplane and Serial Number Information 55
Displaying Environmental Information for a Switch 57
Displaying Temperatures for Modules 60
Connecting to a Module 62
Saving the Module Configuration 63
Displaying Power Usage Information 63
Reloading a Module 64
Rebooting the Switch 64
Overview of Supervisor Modules 65
Shutting Down a Supervisor Module 65
Overview of I/O Module Support 65
Accessing an I/O Module through a Console 67
Displaying Information for the Installed Modules 67
Purging the Module Configuration 70
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Shut Down or Power Up an I/O Module 70
Overview of Fabric Module Support 71
Change the Amount of Power Reserved for Fabric Modules 71
Shutting Down or Powering Up a Fabric Module 72
Power Modes Overview 73
Guidelines for Configuring Power Redundancy Modes 73
Configuring the Power Mode 74
Maximum Power Available for 3-kW AC Power Supplies 75
Maximum Power Available for 3-kW DC Power Supplies 75
Maximum Power Available for 3.5-kW Inputs (AC) 75
Maximum Power Available for 3.5-kW Inputs (DC) 76
Overview of Fan Trays 77
Displaying the Status for the Fan Trays 79
Contents
CHAPTER 6
Installing or Replacing Modules, Fan Trays, and Power Supplies 81
Using an ESD Wrist Strap to Prevent ESD Damage 81
Installing or Replacing a Supervisor Module 82
Migrating from Supervisor 2E Modules (N77-SUP2E) to Supervisor 3E Modules (N77-SUP3E) 86
Installing or Replacing an I/O Module 89
Replacing a Fan Tray 91
Migrating from Gen 1 Fan Trays (N77-C7706-FAN) to Gen 2 Fan Trays (N77-C7706-FAN-2) 96
Installing or Replacing a Fabric Module 98
Replacing Fabric 2 Modules with Fabric 3 Modules 103
Recovery Procedure for Downgrading to Fabric 2 Modules from Fabric 3 Modules 104
Installing or Replacing a Power Supply in a Switch Chassis 104
Connecting a 3-kW AC Power Supply to AC Power Sources 106
Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources 107
Connecting DC Power Supplies with Power Sources 109
Connecting a 3.5-kW HVAC/HVDC Power Supply to DC Power Sources 111
APPENDIX A
Switch Specifications 113
Environmental Specifications 113
Switch Dimensions 114
Power Requirements 114
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Maximum Power Available for 3-kW AC Power Supplies 115
Maximum Power Available for 3-kW DC Power Supplies 116
Maximum Power Available for 3.5-kW Inputs (AC) 116
Maximum Power Available for 3.5-kW Inputs (DC) 117
Weights and Quantities for the Chassis, Modules, Fan Trays, and Power Supplies 118
Transceivers, Connectors, and Cables Used with Each I/O Module 120
100-Gb CPAK Transceiver Specifications 125
100-Gb QSFP+ Transceiver Specifications 126
40-Gb QSFP+ Transceiver Specifications 128
10-Gb SFP+ Optical Transceivers and Fabric Extender Transceivers 130
10BASE-DWDM SFP+ Transceiver Specifications 134
1-Gb SFP Transceivers 137
1000BASE-CWDM SFP Transceiver Cables 137
APPENDIX B
1000BASE-DWDM SFP Transceiver Specifications 139
1000BASE-T and 1000BASE-X SFP Transceiver Specifications 141
RJ-45 Module Connectors 143
Power Supply Cable Specifications 143
3-kW AC Power Cord Specifications 144
3.5-kW HVAC/HVDC Power Supply AC Power Cord Specifications 145
3-kW DC Power Cord Specifications 155
3.5-kW HVAC/HVDC Power Supply DC Power Cord Specifications 155
LEDs 159
Chassis LEDs 159
Supervisor Module LEDs 160
I/O Module LEDs 162
Fabric Module LEDs 164
Fan Tray LEDs 164
Power Supply LEDs 165
APPENDIX C
Accessory Kits 167
Cisco Nexus 7706 Switch Accessory Kit 167
Cisco Nexus 7706 Switch Center-Mount Rails Kit 170
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APPENDIX D
Site Preparation and Maintenance Records 171
Site Preparation Checklist 171
Contact and Site Information 172
Chassis and Module Information 173
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Preface
This preface describes the audience, organization and conventions of the Cisco Nexus 7000 Series NX-OS
Fundamentals Configuration Guide. It also provides information on how to obtain related documentation.
• Audience, on page ix
• Document Conventions, on page ix
• Documentation Feedback, on page x
• Obtaining Documentation and Submitting a Service Request, on page xi
Audience
This publication is for network administrators who configure and maintain Cisco Nexus devices.
Document Conventions
Note
As part of our constant endeavor to remodel our documents to meet our customers' requirements, we have
modified the manner in which we document configuration tasks. As a result of this, you may find a deviation
in the style used to describe these tasks, with the newly included sections of the document following the new
format.
Command descriptions use the following conventions:
DescriptionConvention
bold
Italic
[x | y]
Bold text indicates the commands and keywords that you enter literally
as shown.
Italic text indicates arguments for which the user supplies the values.
Square brackets enclose an optional element (keyword or argument).[x]
Square brackets enclosing keywords or arguments separated by a vertical
bar indicate an optional choice.
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Documentation Feedback
Preface
DescriptionConvention
{x | y}
Braces enclosing keywords or arguments separated by a vertical bar
indicate a required choice.
[x {y | z}]
Nested set of square brackets or braces indicate optional or required
choices within optional or required elements. Braces and a vertical bar
within square brackets indicate a required choice within an optional
element.
variable
Indicates a variable for which you supply values, in context where italics
cannot be used.
string
A nonquoted set of characters. Do not use quotation marks around the
string or the string will include the quotation marks.
Examples use the following conventions:
DescriptionConvention
Terminal sessions and information the switch displays are in screen font.screen font
Information you must enter is in boldface screen font.boldface screen font
italic screen font
Arguments for which you supply values are in italic screen font.
Nonprinting characters, such as passwords, are in angle brackets.< >
Default responses to system prompts are in square brackets.[ ]
!, #
This document uses the following conventions:
Note
Means reader take note. Notes contain helpful suggestions or references to material not covered in the manual.
Caution
Means reader be careful. In this situation, you might do something that could result in equipment damage or
loss of data.
Documentation Feedback
To provide technical feedback on this document, or to report an error or omission, please send your comments
to: .
We appreciate your feedback.
An exclamation point (!) or a pound sign (#) at the beginning of a line
of code indicates a comment line.
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Preface
Obtaining Documentation and Submitting a Service Request
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service
request, and gathering additional information, see What's New in Cisco Product Documentation.
To receive new and revised Cisco technical content directly to your desktop, you can subscribe to the What's
New in Cisco Product Documentation RSS feed. RSS feeds are a free service.
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Preface
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CHAPTER 1
Overview
This chapter includes the following sections:
• Overview of the Cisco Nexus 7706 Switch Installation Features, on page 1
Overview of the Cisco Nexus 7706 Switch Installation Features
The Cisco Nexus 7706 chassis has six slots for one or two supervisor modules and up to four I/O modules.
The chassis also holds up to six fabric modules, up to four AC or DC 3-kW and 3.5-kW HVAC/HVDC power
supplies, and three fan trays. To group the many networking cables for each I/O module on this chassis, you
can install cable management frames on either side of the chassis. You can install an optional locking front
door and you can install an optional set of air filters on the front door and cable management frames. The
following figure shows the standard hardware features seen from the front of the chassis.
Figure 1: Standard Hardware Features on the Front of the Cisco Nexus 7706 Chassis
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Overview of the Cisco Nexus 7706 Switch Installation Features
2
side of the chassis behind the cable
management frames)
I/O modules (1–4) in Slots 1,2,5,6
4
• 48-port 1/10-Gigabit Ethernet I/O
module (N77-F248XP-23E)
• 12-port 100-Gigabit Ethernet I/O
module (N77-F312CK-26)
Supervisor modules (one or two) (N77-SUP2E and
5Chassis LEDs1
N77-SUP3E) in Slots 3, 4
Power supplies (up to 4)
6Chassis mounting brackets (one on each
• 3-kW AC power supply (N77-AC-3KW)
• 3-kW DC power supply (N77-DC-3KW)
• 3.5-kW HVAC/HVDC power supply
(N77-HV-3.5KW)
Chassis handles (used only for small movements
7Cable management frame (2)3
on the rack)
Overview
• 24-port 40-Gigabit Ethernet I/O
module (N77-F324FQ-25)
• 48-port 1- and 10-Gigabit Ethernet
I/O module (N77-F348XP-23)
• 12-port 100-Gigabit Ethernet I/O
module (N77-M312CQ-26L)
• 24-port 40-Gigabit Ethernet I/O
module (N77-M324FQ-25L)
• 48-port 1- and 10-Gigabit Ethernet
I/O module (N77-M348XP-23L)
The following figure shows the standard hardware features seen from the rear of the chassis.
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Overview
Overview of the Cisco Nexus 7706 Switch Installation Features
Figure 2: Standard Hardware Features on the Rear of the Cisco Nexus 7706 Chassis
Handles used only for adjusting the position of
1
N77-C7706-FAN, are shown in this figure, one
is removed to show the two fabric modules in
back. There are 2 types of fan trays: 38 mm Gen
4Three fan trays—only two fan trays,
the chassis on the mechanical lift or on the
bottom support rails (do not lift the chassis with
these handles)
1 fan trays (N77-C7706-FAN) and 76 mm Gen
2 fan trays (N77-C7706-FAN-2). Use the Gen
2 fan trays for Network Equipment Building
System (NEBS) compliance when the Cisco
Nexus 7700 M3-Series 12-port 100-Gigabit
Ethernet I/O module (N77-M312CQ-26L) is
installed on the switch.
Vertical mounting brackets used for securing
2
fan tray) (N77-C7706-FAB-2 and
N77-C7706-FAB-3)
LEDs for the fan tray and fabric modules behind
3
5Fabric modules (up to six with two behind each
the chassis to the rack and for holding the cable
management frames
the fan tray
The following figure shows the optional features seen on the front of the Cisco Nexus 7706 chassis.
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Overview of the Cisco Nexus 7706 Switch Installation Features
Figure 3: Optional Hardware Features on the Front of the Cisco Nexus 7706 Chassis
Overview
Air filter (N77-C7706-AFLT) shown on the
2Front doors with locks (N77-C7706-FDK)1
outside of the cable management frames. Filters
also included inside and on the sides of the front
door (not shown).
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Preparing the Site
This chapter includes the following sections:
• Humidity Requirements, on page 5
• Altitude Requirements, on page 5
• Dust and Particulate Requirements, on page 6
• Minimizing Electromagnetic and Radio Frequency Interference, on page 6
• Shock and Vibration Requirements, on page 7
• Grounding Requirements, on page 7
• Planning for Power Requirements, on page 7
• Rack and Cabinet Requirements, on page 10
• Clearance Requirements, on page 11
Humidity Requirements
High humidity can cause moisture to seep into the switch. Moisture can cause corrosion of internal components
and degradation of properties such as electrical resistance, thermal conductivity, physical strength, and size.
The switch is rated to operate at 8 to 80 percent relative humidity, with a humidity gradation of 10 percent
per hour.
CHAPTER 2
The switch can withstand from 5 to 90 percent relative humidity. Buildings in which the climate is controlled
by air-conditioning in the warmer months and by heat during the colder months usually maintain an acceptable
level of humidity for the switch equipment. However, if the switch is located in an unusually humid location,
you should use a dehumidifier to maintain the humidity within an acceptable range.
Altitude Requirements
If you operate a switch at a high altitude (low pressure), the efficiency of forced and convection cooling is
reduced and can result in electrical problems that are related to arcing and corona effects. This condition can
also cause sealed components with internal pressure, such as electrolytic capacitors, to fail or to perform at a
reduced efficiency. This switch is rated to operate at altitudes from –500 to 13,123 feet (–152 to 4,000 meters).
You can store the switch at altitudes of –1,000 to 30,000 feet (–305 to 9,144 meters).
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Dust and Particulate Requirements
Dust and Particulate Requirements
Exhaust fans cool power supplies and system fan trays cool switches by drawing in air and exhausting air out
through various openings in the chassis. However, fans also ingest dust and other particles, causing contaminant
buildup in the switch and increased internal chassis temperature. A clean operating environment can greatly
reduce the negative effects of dust and other particles, which act as insulators and interfere with the mechanical
components in the switch.
In addition to regular cleaning, follow these precautions to avoid contamination of your switch:
• Do not permit smoking near the switch.
• Do not permit food or drink near the switch.
Minimizing Electromagnetic and Radio Frequency Interference
Electromagnetic interference (EMI) and radio frequency interference (RFI) from the switch can adversely
affect other devices such as radio and television (TV) receivers operating near the switch. Radio frequencies
that emanate from the switch can also interfere with cordless and low-power telephones. Conversely, RFI
from high-power telephones can cause spurious characters to appear on the switch monitor.
RFI is defined as any EMI with a frequency above 10 kHz. This type of interference can travel from the switch
to other devices through the power cable and power source or through the air like transmitted radio waves.
The Federal Communications Commission (FCC) publishes specific regulations to limit the amount of EMI
and RFI that can be emitted by computing equipment. Each switch meets these FCC regulations.
To reduce the possibility of EMI and RFI, follow these guidelines:
• Cover all open expansion slots with a metal filler.
• Always use shielded cables with metal connector shells for attaching peripherals to the switch.
When wires are run for any significant distance in an electromagnetic field, interference can occur between
the field and the signals on the wires and cause the following implications:
• Bad wiring can result in radio interference emanating from the plant wiring.
• Strong EMI, especially when it is caused by lightning or radio transmitters, can destroy the signal drivers
and receivers in the chassis and even create an electrical hazard by conducting power surges through
lines into equipment.
Note
To predict and prevent strong EMI, you might need to consult experts in radio frequency interference (RFI).
The wiring is unlikely to emit radio interference if you use twisted-pair cable with a good distribution of
grounding conductors. If you exceed the recommended distances, use a high-quality twisted-pair cable with
one ground conductor for each data signal when applicable.
If the wires exceed the recommended distances, or if wires pass between buildings, give special consideration
to the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by lightning or other
high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic
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Preparing the Site
switches. You may want to consult experts in electrical surge suppression and shielding if you had similar
problems in the past.
Shock and Vibration Requirements
The switch shock- and vibration-tested for operating ranges, handling, and earthquake standards to Network
Equipment Building Standards (NEBS) Zone 4 per GR-63-Core.
Grounding Requirements
The switch is sensitive to variations in voltage supplied by the power sources. Overvoltage, undervoltage,
and transients (or spikes) can erase data from the memory or cause components to fail. To protect against
these types of problems, ensure that there is an earth-ground connection for the switch. You can connect the
grounding pad on the switch either directly to the earth-ground connection or to a fully bonded and grounded
rack.
You must provide the grounding cable to make this connection but you can connect the grounding wire to the
switch using a grounding lug that ships with the switch. Size the grounding wire to meet local and national
installation requirements. Depending on the power supply and system, a 12 AWG to 6 AWG copper conductor
is required for U.S. installations (for those installations, we recommend that you use commercially available
6 AWG wire). The length of the grounding wire depends on the proximity of the switch to proper grounding
facilities.
Shock and Vibration Requirements
Planning for Power Requirements
To plan for the power requirements of a switch, you must determine each of the following:
• Power requirements of the switch
• Minimum number of power supplies required to power the switch and its components
• Power mode to use and the number of additional power supplies required for that mode
You must also ensure that the circuit used for the switch is dedicated to the switch to minimize the possibility
of circuit failure.
When you know the amount of power that is required for operations (available power) and redundancy (reserve
power), you can plan for the required number of input power receptacles with reach of the switch location.
Step 1 Determine the power requirement for the switch by summing the maximum wattage for each installed module (see the
following table).
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Table 1: Power Requirements for the Cisco Nexus 7706 Switch Modules
Preparing the Site
TypicalMaximumQuantityComponent
Supervisor Modules
F2 I/O Modules
(same
type if
using 2)
(can mix
types)
——1 or 2
137 W265 WSupervisor 2 Enhanced (N77-SUP2E)
110 W150 WSupervisor 3 Enhanced (N77-SUP3E)
——1 to 4
451 W500 W48-port 1- and 10-Gigabit Ethernet I/O module (N77-F248XP-23E)
——F3 I/O Modules
480 W48-port 1- and 10-Gigabit Ethernet I/O module (N77-F348XP-23)
450 W
650 W740 W24-port 40-Gigabit Ethernet I/O module (N77-F324FQ-25)
640 W730 W12-port 100-Gigabit Ethernet I/O module (N77-F312CK-26)
——M3 I/O Modules
560 W48-port 1- and 10-Gigabit Ethernet I/O module (N77-M348XP-23L)
500 W
700 W750 W24-port 40-Gigabit Ethernet I/O module (N77-M324FQ-25L)
800 W1095 W12-port 100-Gigabit Ethernet I/O module (N77-M312CQ-26L)
80 W3 to 6Fabric Module (N77-C7706-FAB-2)
65
W
85 W3 to 6Fabric Module (N77-C7706-FAB-3)
———Fan Trays
300 W338 mm Gen 1 Fan Tray (N77-C7706-FAN)
30 W
30 W300 W376 mm Gen 2 Fan Tray (N77-C7706-FAN-2)
For example, if you are installing a switch with two Supervisor 2 modules (2 x 265 W), four 48-port 10-Gigabit Ethernet
I/O modules (PID: N77-F248XP-23E) (4 x 500 W), six fabric modules (6 x 150 W) and three fan trays (3 x 600 W), the
power requirements for this switch would be 5230 W.
Note
Maximum power values are used for calculating the power requirements.
Step 2 Determine the number of power supplies needed for the available power requirement by dividing the power requirement
amount (see Step 1) by the output wattage of the power supplies installed in the switch.
For example, if you are installing a switch with 3-kW power supplies and have a consumption of 5230 W, you need two
power supplies (5230 W / 3000 W = 1.74 or 2 power supplies) to operate the switch and all of its modules.
Step 3 Select one of the following power modes to determine the number of additional power supplies required for reserve
power:
65
W
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Planning for Power Requirements
• Combined power—Do not add any power supplies to the number of power supplies calculated for the available
power in Step 2. This power mode does not provide power redundancy, so no extra power supplies are needed.
• Power supply redundancy (n+1 redundancy)—Add one power supply (reserve power supply). This form of power
redundancy provides a reserve power supply that can replace any active power supply that goes offline.
• Input source redundancy (grid redundancy)—Add enough power supplies (reserve power supplies) to at least equal
the total output of the active power supplies (number of power supplies calculated in Step 2). Typically, you would
double the number of power supplies. You must plan for a second power source for the reserve power supplies. For
example, if you calculate that you need two 3-kW power supplies for 6 kW of available power, you need another
two 3-kW power supplies for 6 kW of reserve power (for a total of four 3-kW power supplies used for available and
reserve power).
• Full redundancy (n+1 and grid redundancy)—Add enough power supplies (reserve power supplies) to at least equal
the output of the active power supplies (number of power supplies calculated in Step 2). For power supply (n+1)
redundancy, ensure that you have at least one extra power supply. For input-source (grid) redundancy, you will
probably double the number of power supplies. You must plan for a second power source with at least the same
amount of input power for the reserve power supplies. For example, if you calculate that you need two 3-kW power
supplies for 6 kW of active power, then you need another two 3-kW power supplies for 6 kW of reserve power (for
a total of four 3-kW power supplies used for active and reserve power). Either one of the reserve power supplies
can replace any of the active power supplies.
Step 4 Be sure that the power source circuits are dedicated to the switch and not to other electrical equipment.
For combined power mode (no power redundancy) or power supply (n+1) redundancy, you need only one dedicated
circuit. The requirements for each circuit are listed in the following table.
Table 2: Circuit Requirements for 3-kW Power Supplies
Power Supply
Requirement for Each CircuitNumber of
Circuits
AC Power Supplies
20 A at 110 VAC or 220 VAC1(N77-AC-3.0KW)3-kW power supply
DC Power Supplies
20A1(N77-DC-3.0KW)3-kW power supply
Table 3: Circuit Requirements for 3.5-kW HVAC/HVDC Power Supplies
Power Supply
Requirement for Each CircuitNumber of
Circuits
1(N77-HV-3.5KW)3.5-kW
HVAC/HVDC power
supply
20 A at 110 VAC, 210 VAC, 220/230 VAC and
277 VAC or 20 A at 210 VDC, 220/240 VDC
and 380 VDC
Step 5 Plan the placement of the input power receptacles within reach of the power cables used for each power supply (see the
following table for the maximum distances).
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Rack and Cabinet Requirements
Typically, power receptacles are placed on the rack with the switch. If the DC power source is further than allowed by
the DC power cables, you can install a power interface unit (PIU) in the rack with the switch and connect that to the
power source with other cabling.
Maximum Distance Between Receptacle and Power SupplyPower Supply
12 feet (3.6 m)All AC power supplies
14 feet (4.26 m)HVAC/HVDC 3.5-kW power
supplies
Determined by the length of the power cord that you supply.DC 3-kW power supplies
Rack and Cabinet Requirements
You can install the following types of racks or cabinets for your switch:
Preparing the Site
• Standard perforated cabinets
• Solid-walled cabinets with a roof fan tray (bottom to top cooling)
Note
Installation clearance requirements for solid-wall cabinets are not in the scope of
this guide. Such installations have to be custom-engineered by a cooling
professional. The customised configuration should satisfy the requirements
mentioned in the Preparing the Site and the Switch Specifications sections.
• Standard open four-post Telco racks
• Standard open two-post Telco racks
To correctly install the switch in a cabinet that is located in a hot-aisle/cold-aisle environment, you should fit
the cabinet with baffles to prevent exhaust air from recirculating into the chassis air intake.
Work with your cabinet vendors to determine which of their cabinets meet the following requirements or see
the Cisco Technical Assistance Center (TAC) for recommendations:
• Use a standard 19-inch, four-post Electronic Industries Alliance (EIA) cabinet or rack with mounting
rails that conform to English universal hole spacing per section 1 of the ANSI/EIA-310-D-1992 standard.
• The height of the rack or cabinet must accommodate the 9-RU (15.75 inches or 40.0 cm) height of the
switch and its bottom support bracket.
• The depth of a four-post rack must be 24 to 32 inches (61.0 to 81.3 cm) between the front and rear
mounting brackets.
• Required clearances between the chassis and the edges of its rack or the interior of its cabinet are as
follows:
• 7.5 inches (19.1 cm) between the front of the chassis and the front of the rack or interior of the
cabinet (required for cabling).
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Preparing the Site
Clearance Requirements
• 3.0 inches (7.6 cm) between the rear of the chassis and the perforated rear door of the cabinet
(required for airflow in the cabinet if used).
Note
This requirement does not apply to enclosures which have a solid rear door or
wall with other exhaust configurations.
• No clearance is required between the chassis and the sides of the rack or cabinet (no side airflow).
Additionally, you must consider the following site requirements for the rack:
• Power receptacles must be located within reach of the power cords used with the switch.
• AC power supplies
• Power cords for 3-kW AC power supplies are 8 to 12 feet (2.5 to 3.6 m) long.
• DC power supplies
• Power cords for 3.0-kW DC power supplies are supplied and dimensioned by the customer.
• HVAC/HVDC power supplies
• Power cords for 3.5-kW HVAC/HVDC power supplies are 14 feet (4.26 m) long.
• Clearance required for cables that connect to as many as 400 ports (in addition to the cabling required
for other devices in the same rack). These cables must not block access to any removable chassis modules
or block airflow into or out of the chassis. Route the cables through the cable management frames on the
left and right sides of the chassis.
• Where necessary, have a seismic rating of Network Equipment Building Standards (NEBS) Zone 3 or
Zone 4, per GR-63-CORE if required.
• Minimum gross load rating of 2000 lb (907.2 kg) (static load rating) if supporting two switches.
Clearance Requirements
You must provide the chassis with adequate clearance between the chassis and any other rack, device, or
structure so that you can properly install the chassis, route cables, provide airflow, and maintain the switch.
For the clearances required for an installation of this chassis, see the following figure.
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Clearance Requirements
Preparing the Site
Figure 4: Clearances Required Around the Chassis
4
of the chassis (allow 2 inches [5 cm])
Cisco Nexus 7706 Hardware Installation Guide
Chassis width9Chassis1
10Cable management frames2
No right side clearance required (no airflow on right
side)
11Vertical rack-mount posts and rails3
Rear service clearance required to replace fan trays
and fabric modules
12Area used for fan tray handles at the rear
Airflow clearance area required at the rear of the
chassis within the cabinet (if a cabinet is used)
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Preparing the Site
Clearance Requirements
5
side clearance required)
Chassis depth13Nearest object or inside of cabinet (no
Note
The chassis depth will increase by 2
inches when the 76mm Gen 2 fan tray
(N77-C7706-FAN-2) is used.
6
modules and power supplies
14Air intake from the cold aisle for all
Clearance required between the front of the chassis
and the inside of the cabinet (if used) or the edge of
the cold aisle (if no cabinet) for the cable
management frames and the optional front doors
7
modules and power supplies
15Air exhaust to the hot aisle for all
Front service clearance required for installing the
chassis and replacing the modules on the front of the
chassis
No left side clearance required (no
8
airflow on left side)
Note
Figure 4: Clearances Required Around the Chassis, on page 12 shows the clearance requirements for
conventional cold-aisle to hot-aisle systems which include rack enclosures with perforated front and rear
doors. The information given above does not apply to enclosures which have a solid rear or front door or wall
with other inlet or exhaust configurations. We recommend consulting a cooling professional if a solid rear or
front door is used.
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Clearance Requirements
Preparing the Site
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Installing the Switch Chassis
This chapter includes the following topics:
• Installing a Rack or Cabinet, on page 15
• Unpacking and Inspecting a New Switch, on page 16
• Attaching Bottom-Support Rails to a Two-Post Rack, on page 17
• Attaching Bottom-Support Rails to a Four-Post Rack, on page 19
• Installing the Chassis in a Two-Post Rack, on page 21
• Installing the Chassis on a Four-Post Rack or Cabinet, on page 26
• Grounding a Switch Chassis, on page 31
• Installing Cable Management Frames onto the Chassis , on page 36
• Attaching the Front Door to the Chassis, on page 38
• Installing Air Filters, on page 40
Installing a Rack or Cabinet
Before you install the switch, you must install a standard four-post, 19-inch EIA data center rack (or a cabinet
that contains such a rack) Rack and Cabinet Requirements.
CHAPTER 3
Step 1 Bolt the rack to the concrete subfloor before moving the chassis onto it.
Note
Statement 1048
Step 2 If the rack has bonded construction, connect it to the earth ground. This action enables you to easily ground the switch
and its components and to ground your electrostatic discharge (ESD) wrist strap to prevent damaging discharges when
you handle ungrounded components before installing them.
Step 3 If you need access to the source power at the rack, include either AC power receptacles or a DC power interface unit
(PIU) with the amperage required by the switch that you are installing. .
If you are using DC power, be sure that the DC power supply is grounded and that there is direct access to the facility
DC power or indirect access though a power interface unit (PIU). You must connect the DC power supply to the earth
ground before you connect it to the facility DC power.
Note
Stability hazard. The rack stabilizing mechanism must be in place, or the rack must be bolted to the floor before
you slide the unit out for servicing. Failure to stabilize the rack can cause the rack to tip over.
Take care when connecting units to the supply circuit so that wiring is not overloaded.
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Unpacking and Inspecting a New Switch
Statement 1018
Installing the Switch Chassis
Note
If you are using the combined power mode or power-supply redundancy, you need only one power source. If
you are using input-source redundancy or full redundancy, you need two power sources.
Unpacking and Inspecting a New Switch
Before you install a new chassis, you need to unpack and inspect it to be sure that you have all the items that
you ordered and verify that the switch was not damaged during shipment. If anything is damaged or missing,
contact your customer representative immediately.
Caution
When you handle the chassis or its components, you must follow ESD protocol at all times to prevent ESD
damage. This protocol includes but is not limited to wearing an ESD wrist strap that you connect to the earth
ground.
Tip
Do not discard the shipping container when you unpack the switch. Flatten the shipping cartons and store
them with the pallet used for the system. If you need to move or ship the system in the future, you will need
these containers.
Step 1 Compare the shipment to the equipment list that is provided by your customer service representative and verify that you
have received all of the ordered items.
The shipment should include boxes for the following:
• System chassis, which includes the following installed components:
• 1 or 2 supervisor modules
• 1 to 4 I/O modules
• Up to 6 fabric modules
• 3 fan trays
• 1 to 4 power supply units
• Switch accessory kit
To see a list of what is included in this kit, see Cisco Nexus 7706 Switch Accessory Kit, on page 167.
• Cable management frames
• Left and right side frames
• Top frame
• M4 x 12 mm flat-head Phillips screws (12)
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Installing the Switch Chassis
Attaching Bottom-Support Rails to a Two-Post Rack
• Front door kit — Optional (N77-C7706-FDK)
• Front door (1) (69-2532-01)
• M3 x 8 mm pan-head screws (2) (48-0393-01)
• Air filter kit — Optional (N77-C7706-AFLT)
• Air filter (1) for the front door
• Door-side brush filters (2)
• Cable-management frame brush filters (2)
• M4 x 12 mm flat-head Phillips screws (12)
Step 2 Check the contents of each box for damage.
Step 3 If you notice any discrepancies or damage, send the following information to your customer service representative by
email:
• Invoice number of the shipper (see the packing slip)
• Model and serial number of the missing or damaged unit
• Description of the problem and how it affects the installation
Attaching Bottom-Support Rails to a Two-Post Rack
The bottom-support rails support the weight of the switch chassis in the rack or cabinet. To maximize the
stability of the rack, you must attach these rails at the lowest possible rack unit (RU).
Warning
To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to
ensure that the system remains stable. The following guidelines are provided to ensure your safety:
• This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
• When mounting this unit in a partially filled rack, load the rack from the bottom to the top with the
heaviest component at the bottom of the rack.
• If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the
unit in the rack.
Statement 1006
Before you begin
Before you can install the bottom support rails for the chassis, you must do the following:
• Verify that a two-post rack is installed and secured to the concrete subfloor (see Installing a Rack or
Cabinet).
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Installing the Switch Chassis
Attaching Bottom-Support Rails to a Two-Post Rack
• If any other devices are stored in the rack or cabinet, verify that they are located below where you plan
to install the switch. Also, verify that lighter devices in the same rack are located above where you plan
to install this switch.
• Verify that the center-mount bottom-support rails kit (N77-C7706-CMK) was ordered and shipped with
the chassis.
Step 1 Position one of the two bottom-support rails at the lowest possible RU in the rack or cabinet. Be sure there is at least 9
RU of vertical space above the rails to install the chassis.
Step 2 Use a manual Phillips torque screwdriver to attach the bottom-support rail to the rack using four M6 x 19 mm or 12-24
x 3/4 inch screws and tighten each screw to 40 in. lbs (4.5 N.m) of torque.
Figure 5: Attaching Bottom-Support Rails to a Rack
Cross bar aligned to the lower back of both rails3Adjustable bottom-support rails (2)1
2
3M6 x 19 mm (or 12-24 x 3/4 in.) Phillips screws
(6 to 8 per rail)
M4 x 8 mm screws (1 for each of two ends of the
cross bar)
Step 3 Repeat Steps 1 and 2 to attach the other bottom-support rail to the rack.
Note
Make sure that the two bottom-support rails are level with one another. If they are not level, adjust the higher
rail down to the level of the lower rail.
Step 4 Align the crossbar to the lower back of the two bottom-support rails and use two M4 x 8 mm screws to attach it to each
rail (one screw for each rail). See Callouts 3 and 4 in the previous figure for the placement of the crossbar and its screws.
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