Cisco Nexus 7718 Hardware Installation Manual

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

First Published: 2013-08-31

Last Modified: 2014-06-10

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Text Part Number: OL-30453-01

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Reorient or relocate the receiving antenna.

•

Increase the separation between the equipment and receiver.

•

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•

Consult the dealer or an experienced radio/TV technician for help.

•

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CONTENTS

Preface

CHAPTER 1

CHAPTER 2

Preface vii

Audience vii

Document Conventions vii

Documentation Feedback ix

Obtaining Documentation and Submitting a Service Request ix

Overview 1

Overview of the Cisco Nexus 7718 Switch Installation Features 1

Preparing the Site 9

Humidity Requirements 9

Altitude Requirements 9

Dust and Particulate Requirements 10

Minimizing Electromagnetic and Radio Frequency Interference 10

Shock and Vibration Requirements 11

Grounding Requirements 11

Planning for Power Requirements 11

Rack and Cabinet Requirements 14

Clearance Requirements 17

CHAPTER 3

Installing the Chassis 19

Installing a Rack or Cabinet 19

Unpacking and Inspecting a New Switch 20

Installing the Bottom-Support Rails 21

Installing a Chassis in a Rack or Cabinet 24

Grounding a Switch Chassis 32

Grounding the Front ID Doors 35

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Contents

Installing Cable Management Frames 40

Installing the Front Doors 46

Installing the Air Filters 48

CHAPTER 4

CHAPTER 5

Connecting to the Network 53

Guidelines for Connecting Ports 53

Connecting a Console to the Switch 54

Connecting the Management Interface 55

Creating the Initial Switch Configuration 56

Connecting Interface Ports to the Network 57

Connecting a Fiber-Optic Cable to a Transceiver 58

Disconnecting Optical Ports from the Network 58

Maintaining Transceivers and Optical Cables 59

Managing the Switch 61

Displaying Information About Installed Hardware Modules 61

Displaying the Hardware Inventory for a Switch 63

Displaying the Backplane and Serial Number Information 65

Displaying Environmental Information for a Switch 67

Displaying Temperatures for Modules 70

Connecting to a Module 72

Saving the Module Configuration 73

Displaying Power Usage Information 73

Reloading a Module 73

Rebooting the Switch 74

Overview of Supervisor Modules 75

Shutting Down a Supervisor Module 76

Overview of I/O Module Support 76

Accessing an I/O Module through a Console 77

Displaying Information for the Installed Modules 78

Purging the Module Configuration 80

Shut Down or Power Up an I/O Module 81

Overview of Fabric Module Support 82

Change the Amount of Power Reserved for Fabric Modules 82

Shutting Down or Powering Up a Fabric Module 83

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Contents

Power Modes Overview 83

Guidelines for Configuring Power Redundancy Modes 84

Configuring the Power Mode 88

Maximum Power Available for 3-kW Power Supplies 89

Maximum Power Available for 3-kW DC Power Supplies 91

Maximum Power Available for 3.5-kW Inputs (AC) 92

Maximum Power Available for 3.5-kW Inputs (DC) 96

Overview of Fan Trays 99

Displaying the Status for the Fan Trays 102

CHAPTER 6

APPENDIX A

Installing or Replacing Modules, Fan Trays, and Power Supplies 103

Using an ESD Wrist Strap to Prevent ESD Damage 103

Installing or Replacing a Supervisor Module 105

Installing or Replacing an I/O Module 108

Replacing a Fan Tray 110

Migrating from Gen 1 Fan Trays (N77-C7718-FAN) to Gen 2 Fan Trays

(N77-C7718-FAN-2) 117

Installing or Replacing a Fabric Module 118

Installing or Replacing a Power Supply in a Switch Chassis 124

Connecting a 3-kW AC Power Supply to AC Power Sources 126

Connecting a 3.5-kW HVAC/HVDC Power Supply to AC Power Sources 127

Connecting DC Power Supplies with Power Sources 129

Connecting a 3.5-kW HVAC/HVDC Power Supply to DC Power Sources 131

Switch Specifications 133

Environmental Specifications 133

Switch Dimensions 134

Power Requirements 134

Maximum Power Available for 3-kW Power Supplies 135

Maximum Power Available for 3-kW DC Power Supplies 137

Maximum Power Available for 3.5-kW Inputs (AC) 138

Maximum Power Available for 3.5-kW Inputs (DC) 142

Weights and Quantities for the Chassis, Modules, Fan Trays, and Power Supplies 145

Transceivers, Connectors, and Cables Used with Each I/O Module 147

100-Gb CPAK Transceiver Specifications 154

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Contents

100-Gb QSFP+ Transceiver Specifications 155

40-Gb QSFP+ Transceiver Specifications 157

10-Gb SFP+ Optical Transceivers and Fabric Extender Transceivers 159

10BASE-DWDM SFP+ Transceiver Specifications 163

1-Gb SFP Transceivers 167

1000BASE-CWDM SFP Transceiver Cables 167

1000BASE-DWDM SFP Transceiver Specifications 169

1000BASE-T and 1000BASE-X SFP Transceiver Specifications 171

RJ-45 Module Connectors 173

Power Supply Cable Specifications 174

3-kW AC Power Cord Specifications 174

3.5-kW HVAC/HVDC Power Supply AC Power Cord Specifications 176

3-kW DC Power Cord Specifications 187

APPENDIX B

APPENDIX C

APPENDIX D

3.5-kW HVAC/HVDC Power Supply DC Power Cord Specifications 187

LEDs 191

Chassis LEDs 191

Supervisor Module LEDs 192

I/O Module LEDs 194

Fabric Module LEDs 195

Fan Tray LEDs 196

Power Supply LEDs 196

Accessory Kits 199

Accessory Kit Contents 199

Site Preparation and Maintenance Records 203

Site Preparation Checklist 203

Contact and Site Information 205

Chassis and Module Information 205

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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, page vii

•

Document Conventions, page vii

•

Documentation Feedback, page ix

•

Obtaining Documentation and Submitting a Service Request, page ix

•

Audience

This publication is for network administrators who configure and maintain Cisco Nexus devices.

Document Conventions

Note

OL-30453-01 vii

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

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]

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

Document Conventions

Preface

DescriptionConvention

[x | y]

Square brackets enclosing keywords or arguments separated by a vertical
bar indicate an optional choice.

{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

Note

Caution

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.[ ]

!, #

An exclamation point (!) or a pound sign (#) at the beginning of a line
of code indicates a comment line.

This document uses the following conventions:

Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.

Means reader be careful. In this situation, you might do something that could result in equipment damage
or loss of data.

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Preface

Documentation Feedback

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.

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.

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

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Obtaining Documentation and Submitting a Service Request

Preface

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

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CHAPTER 1

Overview

This chapter includes the following sections:

Overview of the Cisco Nexus 7718 Switch Installation Features, page 1

•

Overview of the Cisco Nexus 7718 Switch Installation Features

The Cisco Nexus 7718 chassis has 18 slots for one or two supervisor modules and up to 16 I/O modules. The
chassis also holds up to six fabric modules, up to 16 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 the chassis. You can install optional locking front doors and you can

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Overview of the Cisco Nexus 7718 Switch Installation Features

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 7718 Chassis

Overview

Supervisor modules (one or two) (N77-SUP2E) in

4Chassis LEDs1

Slots 9,10

Power supplies (up to 16)

2

side of the chassis)

5Chassis 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)

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Overview

3

I/O modules (1–16) in Slots 1-8, 11-18

48-port 1- and 10-Gigabit Ethernet

•

I/O module (N77-F248XP-23E)

48-port 1- and 10-Gigabit Ethernet

•

I/O module (N77-F348XP-23)

48-port 1- and 10-Gigabit Ethernet

•

I/O module (N77-M348XP-23L)

24-port 40-Gigabit Ethernet I/O

•

module (N77-F324FQ-25)

24-port 40-Gigabit Ethernet I/O

•

module (N77-M324FQ-25L)

12-port 100-Gigabit Ethernet I/O

•

module (N77-F312CK-26)

12-port 100-Gigabit Ethernet I/O

•

module (N77-M312CQ-26L)

Overview of the Cisco Nexus 7718 Switch Installation Features

Chassis handles (used only for small movements

6

on the rack)

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

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Overview of the Cisco Nexus 7718 Switch Installation Features

The following figure shows the standard hardware features seen from the rear of the chassis.

Figure 2: Standard Hardware Features on the Rear of the Cisco Nexus 7718 Chassis

Overview

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Overview

Overview of the Cisco Nexus 7718 Switch Installation Features

1

Three fan trays — only 1 fan tray,
N77-C7718-FAN, is shown in this figure to
show fabric modules in back. There are 2 types
of fan trays: 38 mm Gen 1 fan trays
(N77-C7718-FAN) and 76 mm Gen 2 fan trays
(N77-C7718-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.

2

fan tray) (N77-C7718-FAB-2)

Blank module in place of missing fabric module3

Fabric and fan tray LEDs4Fabric modules (up to six with two behind each

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

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Overview of the Cisco Nexus 7718 Switch Installation Features

The following figure shows the optional features seen on the front of the Cisco Nexus 7718 chassis.

Figure 3: Optional Hardware Features on the Front of the Cisco Nexus 7718 Chassis

Overview

Air filter (N77-C7718-AFLT) inside each of

4Front doors with locks (N77-C7718-FDK)1

the top two front doors (filters not shown),
between each door and the cable management
frame (not shown), and over the cable
management frames (shown).

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Overview

2

management area

Power supply door (N77-C7718-FDK)3

Overview of the Cisco Nexus 7718 Switch Installation Features

Power supply cable management frames (not

5Locks to prevent access to the cable

seen behind the power supply door).

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

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Overview of the Cisco Nexus 7718 Switch Installation Features

Overview

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CHAPTER 2

Preparing the Site

This chapter includes the following sections:

Humidity Requirements, page 9

•

Altitude Requirements, page 9

•

Dust and Particulate Requirements, page 10

•

Minimizing Electromagnetic and Radio Frequency Interference, page 10

•

Shock and Vibration Requirements, page 11

•

Grounding Requirements, page 11

•

Planning for Power Requirements, page 11

•

Rack and Cabinet Requirements, page 14

•

Clearance Requirements, page 17

•

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.

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

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Dust and Particulate Requirements

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).

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.

Preparing the Site

Note

If you are using this switch in a nonclean environment, you can order and install optional air fliters. These
air filters require that you also order the optional front door for the chassis.

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.

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Preparing the Site

Shock and Vibration Requirements

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
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 is being 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.

Note

You automatically ground the AC power supplies when you connect them to a power source, but you
cannot ground a 3-kW DC power supply. You must connect the chassis to the facility earth ground.

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

•

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Planning for Power Requirements

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.

Procedure

Preparing the Site

Step 1

Determine the power requirement for the switch by summing the maximum wattage for each installed module
(see the following table).

Table 1: Power Requirements for the Cisco Nexus 7718 Switch Modules

TypicalMaximumQuantityComponent

Supervisor Modules

1 or 2

——

(same
type if

137 W265 WSupervisor 2 Enhanced (N77-SUP2E)

using 2)

F2 I/O Modules

1 to 16

——

(can
mix

451 W500 W48-port 1- and 10-Gigabit Ethernet I/O module (N77-F248XP-23E)

types)

F3 I/O Modules

——

450 W480 W48-port 1- and 10-Gigabit Ethernet I/O module (N77-F348XP-23)

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

——

500 W560 W48-port 1- and 10-Gigabit Ethernet I/O module (N77-M348XP-23L)

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)

102 W300 W3 to 6Fabric Modules (N77-C7718-FAB-2)

Fan Trays

———

51 W900 W338 mm Gen 1 Fan Tray (N77-C7718-FAN)

51 W900 W376 mm Gen 2 Fan Tray (N77-C7718-FAN-2)

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Preparing the Site

Step 2

Planning for Power Requirements

For example, if you are installing a switch with two Supervisor 2 modules (2 x 265 W), 16 48-port 10-Gigabit
Ethernet I/O modules (PID: N77-F248XP-23E) (16 x 500 W), six fabric modules (6 x 300 W) and three fan
trays (3 x 900 W), the power requirements for this switch would be 13,030 W.

Note

Maximum power values are used for calculating the power
requirements.

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 3-kW power supplies, round up a fractional result to the nearest ones digit to determine the number of
power supplies needed.

For example, if you are installing a switch with 3-kW power supplies and have a consumption of 13,030 W,
you need five power supplies (13,030 W / 3000 W = 4.34 or 5 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:

• 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. For input-source (grid) or full redundancy, you must have two dedicated power circuits,
each circuit powering half of the 3-kWor 3.5-kW power supplies. The requirements for each circuit are listed
in the following table.

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Rack and Cabinet Requirements

Table 2: Circuit Requirements for 3-kW Power Supplies

Preparing the Site

Step 5

Power Supply

Circuits

AC Power Supplies

DC Power Supplies

Table 3: Circuit Requirements for 3.5-kW HVAC/HVDC Power Supplies

Power Supply

Circuits

1(N77-HV-3.5KW)3.5-kW
HVAC/HVDC
power supply

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).
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.

Requirement for Each CircuitNumber of

20 A at 110 VAC or 220 VAC1(N77-AC-3.0KW)3-kW power supply

20A1(N77-DC-3.0KW)3-kW power supply

Requirement for Each CircuitNumber of

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

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:

Standard perforated cabinets

•

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Preparing the Site

Solid-walled cabinets with a roof fan tray (bottom to top cooling)

•

Rack and Cabinet Requirements

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

•

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 26-RU (45.25 inches or 114.9 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) is required between the chassis and the front of the rack or interior of the

◦

cabinet (required for cabling).

3.0 inches (7.6 cm) is required between the rear of the chassis and the perforated rear door of the

◦

cabinet (required for airflow inside 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

◦

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Rack and Cabinet Requirements

Clearance required for cables that connect to as many as 1600 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.

•

Preparing the Site

Power cords for 3.5-kW HVAC/HVDC power supplies are 14 feet (4.26 m) long.

◦

1

1

Currently undergoing NEBS testing.

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Preparing the Site

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.

Figure 4: Clearances Required for the Chassis

Clearance Requirements

Chassis width9Chassis1

No right side clearance required (no airflow on right side)10Cable management frames2

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Clearance Requirements

4

5

6

7

(allow 2 inches [5 cm])

(no side clearance required)

modules and power supplies

modules and power supplies

Preparing the Site

Rear service clearance required to replace fan trays and fabric

11Vertical rack-mount posts and rails3

modules

Airflow clearance required between the chassis and inside

12Area required for fan tray handles

of cabinet (if used)

Chassis depth

13Nearest object or inside of cabinet

Note

The chassis depth will increase by 2 inches when
the 76mm Gen 2 fan tray (N77-C7718-FAN-2) is
used.

Clearance required between the front of the chassis and the

14Air intake from cold aisle for all

inside of the cabinet (if used) or edge of cold aisle (if no
cabinet) for the cable management frames and the optional
front doors

Front service clearance required for installing the chassis and

15Air exhaust to hot aisle for all

replacing the modules

Note

No left side clearance required (no

8

airflow on left side)

Figure 4: Clearances Required for the Chassis , on page 17 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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Installing the Chassis

This chapter includes the following topics:

Installing a Rack or Cabinet, page 19

•

Unpacking and Inspecting a New Switch, page 20

•

Installing the Bottom-Support Rails , page 21

•

Installing a Chassis in a Rack or Cabinet, page 24

•

Grounding a Switch Chassis, page 32

•

Installing Cable Management Frames, page 40

•

Installing the Front Doors, page 46

•

Installing the Air Filters, page 48

•

CHAPTER 3

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) that meets the requirements listed in Rack and Cabinet Requirements.

Procedure

Step 1

Step 2

Step 3

OL-30453-01 19

Bolt the rack to the concrete subfloor before moving the chassis onto it.

Warning

Statement 1048

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.

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. .

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.

Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide

Unpacking and Inspecting a New Switch

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.

Take care when connecting units to the supply circuit so that wiring is not overloaded.Warning

Statement 1018

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.

Installing the Chassis

Caution

Tip

Step 1

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.

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.

Procedure

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 16 I/O modules

◦

Up to 6 fabric modules

◦

3 fan trays

◦

1 to 16 power supply units

◦

Switch accessory kit

•

To see a list of what is included in this kit, see Accessory Kit Contents, on page 199.

Cable management frames

•

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