Juniper QFX5120 Series, QFX5120-32C-AFI, QFX5120-48Y-AFO2, QFX5120-48Y-AFI2, QFX5120-48Y-DC-AFO2 Hardware Manual

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QFX5120 Switch Hardware Guide

Published

2019-10-15

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Juniper Networks, Inc. 1133 Innovation Way Sunnyvale, California 94089 USA 408-745-2000 www.juniper.net

Juniper Networks, the Juniper Networks logo, Juniper, and Junos are registered trademarks of Juniper Networks, Inc. in the United States and other countries. All other trademarks, service marks, registered marks, or registered service marks are the property of their respective owners.

Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice.

QFX5120 Switch Hardware Guide

The information in this document is current as of the date on the title page.

YEAR 2000 NOTICE

Juniper Networks hardware and software products are Year 2000 compliant. Junos OS has no known time-related limitations through the year 2038. However, the NTP application is known to have some difficulty in the year 2036.

END USER LICENSE AGREEMENT

The Juniper Networks product that is the subject of this technical documentation consists of (or is intended for use with) Juniper Networks software. Use of such software is subject to the terms and conditions of the End User License Agreement (“EULA”) posted at https://support.juniper.net/support/eula/. By downloading, installing or using such software, you agree to the terms and conditions of that EULA.

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About the Documentation | xi

Documentation and Release Notes | xi

Using the Examples in This Manual | xi

Merging a Full Example | xii

Merging a Snippet | xiii

Documentation Conventions | xiii

Documentation Feedback | xvi

Requesting Technical Support | xvi

Self-Help Online Tools and Resources | xvii

Creating a Service Request with JTAC | xvii

iii

Overview

QFX5120 System Overview | 21

QFX5120 Switches Hardware Overview | 21

Benefits of the QFX5120 Switch | 22

QFX5120 Hardware | 22

System Software | 27

QFX5120 Power System | 27

QFX5120 Switch Models | 28

Identifying QFX5120 Switch Models | 30

Chassis Physical Specifications for QFX5120 Switches | 31

Field-Replaceable Units in QFX5120 Switches | 32

QFX5120 Chassis | 32

QFX5120 Cooling System | 33

QFX5120 Models with Front-to-Back Airflow | 33

QFX5120 Models with Back-to-Front Airflow | 34

Positioning the Switch | 36

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QFX5120 Fan Module Status | 36

Management Port LEDs on QFX5120 Switches | 37

Network Port LEDs on QFX5120 Switches | 38

QFX5120 Cooling System | 41

QFX5120 Cooling System | 42

QFX5120 Models and Airflow Direction | 43

QFX5120 Models with Front-to-Back Airflow | 45

QFX5120 Models with Back-to-Front Airflow | 47

Positioning the Switch | 48

QFX5120 Fan Module Status | 49

QFX5120 Power System | 49

AC Power Supply in QFX5120 Switches | 50

AC Power Supply Specifications for QFX5120 Switches | 50

AC Power Supply Airflow | 51

AC Power Supply Specifications for QFX5120 Switches | 52

AC Power Cord Specifications for QFX5120 Switches | 53

AC Power Supply LEDs in QFX5120 Switches | 55

DC Power Supply in QFX5120 Switches | 57

Characteristics of a DC Power Supply | 58

DC Power Supply Airflow | 59

QFX5120 DC Power Specifications | 60

DC Power Supply LEDs in QFX5120 Switches | 60

Site Planning, Preparation, and Specifications

Site Preparation Checklist for QFX5120 Switches | 65

QFX5120 Site Guidelines and Requirements | 66

Environmental Requirements and Specifications for QFX5120 Switches | 66

General Site Guidelines | 68

Site Electrical Wiring Guidelines | 68

Rack Requirements for QFX5120 Switches | 69

Cabinet Requirements for QFX5120 Switches | 70

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Clearance Requirements for Airflow and Hardware Maintenance for QFX5120 Switches | 71

QFX5120 Network Cable and Transceiver Planning | 73

Pluggable Transceivers Supported on QFX5120 Switches | 73

SFP28 Direct Attach Copper Cables for QFX5120 Switches | 74

Cable Specifications | 75

Standards Supported by These Cables | 75

QSFP28 Direct Attach Copper Cables for QFX5120 Switches | 76

Cable Specifications | 76

Section | ?

Cable Specifications for QSFP+ and QSFP28 Transceivers on QFX5120 Switches | 77

Calculating the Fiber-Optic Cable Power Budget for QFX Series Switches | 78

Calculating the Fiber-Optic Cable Power Margin for QFX Series Switches | 79

QFX5120 Management Cable Specifications and Pinouts | 81

Console Port Connector Pinout Information | 81

RJ-45 Management Port Connector Pinout Information | 82

RJ-45 to DB-9 Serial Port Adapter Pinout Information | 83

QSFP+,QSFP28, SFP, SFP+, and SFP28 Port Connector Pinout Information | 83

Initial Installation and Configuration

Unpacking and Mounting the QFX5120 Switch | 91

Unpacking the Switch | 91

Parts Inventory (Packing List) for a QFX5120 Switch | 92

Registering Products—Mandatory for Validating SLAs | 93

Mounting a QFX5120 Switch on Four Posts of a Rack or Cabinet | 93

Connecting the QFX5120 to Power | 98

Connecting Earth Ground to a QFX5120 Switch | 98

Connecting AC Power to a QFX5120 Switch | 99

Connecting DC Power to a QFX5120 Switch | 101

Connecting the QFX5120 to the Network | 106

Installing a Transceiver | 106

Connecting a Fiber-Optic Cable | 109

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Connecting the QFX5120 to External Devices | 110

Connecting a Device to a Network for Out-of-Band Management | 110

Connecting a Device to a Management Console by Using an RJ-45 Connector | 111

Configuring Junos OS on the QFX5120 | 112

QFX5120 Default Configuration | 113

Connecting and Configuring a QFX5120 Switch | 113

Maintaining Components

Maintaining the QFX5120 Cooling System | 121

Removing a Fan Module from a QFX5120 Switch | 121

Installing a Fan Module in a QFX5120 Switch | 122

Maintaining the QFX5120 Power System | 124

Removing Power Supply from a QFX5120 Switch | 124

Connecting AC Power to a QFX5120 Switch | 126

Maintaining Transceivers | 129

Removing a Transceiver | 129

Removing a QSFP28 Transceiver | 132

Installing a Transceiver | 134

Installing a QSFP28 Transceiver | 136

Maintaining Fiber-Optic Cables | 138

Connecting a Fiber-Optic Cable | 138

Disconnecting a Fiber-Optic Cable | 139

Maintaining Fiber-Optic Cables | 140

Troubleshooting Hardware

Troubleshooting QFX5120 Components | 145

Understanding Alarms | 145

Interface Alarm Messages | 146

Creating an Emergency Boot Device | 147

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Contacting Customer Support and Returning the Chassis or Components

Returning a QFX5120 Chassis or Components | 151

Returning a QFX5120 Switch or Component for Repair or Replacement | 151

Locating the Serial Number on a QFX5120 Switch or Component | 152

Listing the Switch and Components Details with the CLI | 152

Locating the Chassis Serial Number ID Label on a QFX5120 Switch | 152

Locating the Serial Number ID Labels on FRUs in a QFX5120 Switch | 153

Contacting Customer Support to Obtain Return Material Authorization | 154

Packing a QFX5120 Switch or Component for Shipping | 155

Packing a QFX5120 Switch for Shipping | 155

Packing QFX5120 Switch Components for Shipping | 157

Safety and Compliance Information

vii

General Safety Guidelines and Warnings | 161

Definitions of Safety Warning Levels | 162

Qualified Personnel Warning | 164

Warning Statement for Norway and Sweden | 165

Fire Safety Requirements | 165

Fire Suppression | 165

Fire Suppression Equipment | 165

Installation Instructions Warning | 167

Chassis and Component Lifting Guidelines | 167

Restricted Access Warning | 169

Ramp Warning | 171

Rack-Mounting and Cabinet-Mounting Warnings | 171

Grounded Equipment Warning | 176

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Radiation from Open Port Apertures Warning | 177

Laser and LED Safety Guidelines and Warnings | 178

General Laser Safety Guidelines | 178

Class 1 Laser Product Warning | 179

Class 1 LED Product Warning | 180

Laser Beam Warning | 181

Maintenance and Operational Safety Guidelines and Warnings | 181

Battery Handling Warning | 183

Jewelry Removal Warning | 184

Lightning Activity Warning | 186

Operating Temperature Warning | 187

Product Disposal Warning | 189

viii

General Electrical Safety Guidelines and Warnings | 190

Action to Take After an Electrical Accident | 191

Prevention of Electrostatic Discharge Damage | 191

AC Power Electrical Safety Guidelines | 193

AC Power Disconnection Warning | 194

DC Power Electrical Safety Guidelines | 195

DC Power Disconnection Warning | 196

DC Power Grounding Requirements and Warning | 198

DC Power Wiring Sequence Warning | 200

DC Power Wiring Terminations Warning | 203

Multiple Power Supplies Disconnection Warning | 206

TN Power Warning | 207

Agency Approvals for QFX5120 Switches | 207

Compliance Statements for EMC Requirements for the QFX Series | 209

QFX 5120 | 209

Canada | 210

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European Community | 211

Israel | 211

Japan | 211

Korea | 212

Tawain | 212

United States | 212

Nonregulatory Environmental Standards | 213

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About the Documentation

IN THIS SECTION

Documentation and Release Notes | xi

Using the Examples in This Manual | xi

Documentation Conventions | xiii

Documentation Feedback | xvi

Requesting Technical Support | xvi

Use this guide to install hardware and perform initial software configuration, routine maintenance, and troubleshooting for the QFX5120 switch. After completing the installation and basic configuration procedures covered in this guide, refer to the Junos OS documentation for information about further software configuration.

Documentation and Release Notes

To obtain the most current version of all Juniper Networks®technical documentation, see the product documentation page on the Juniper Networks website at https://www.juniper.net/documentation/.

If the information in the latest release notes differs from the information in the documentation, follow the product Release Notes.

Juniper Networks Books publishes books by Juniper Networks engineers and subject matter experts. These books go beyond the technical documentation to explore the nuances of network architecture, deployment, and administration. The current list can be viewed at https://www.juniper.net/books.

Using the Examples in This Manual

If you want to use the examples in this manual, you can use the load merge or the load merge relative command. These commands cause the software to merge the incoming configuration into the current candidate configuration. The example does not become active until you commit the candidate configuration.

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If the example configuration contains the top level of the hierarchy (or multiple hierarchies), the example is a full example. In this case, use the load merge command.

If the example configuration does not start at the top level of the hierarchy, the example is a snippet. In this case, use the load merge relative command. These procedures are described in the following sections.

Merging a Full Example

To merge a full example, follow these steps:

1. From the HTML or PDF version of the manual, copy a configuration example into a text file, save the file with a name, and copy the file to a directory on your routing platform.

For example, copy the following configuration to a file and name the file ex-script.conf. Copy the ex-script.conf file to the /var/tmp directory on your routing platform.

system {

scripts {

commit {

file ex-script.xsl;

}

} } interfaces {

fxp0 {

disable; unit 0 {

family inet {

address 10.0.0.1/24;

}

} }

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2. Merge the contents of the file into your routing platform configuration by issuing the load merge configuration mode command:

[edit] user@host# load merge /var/tmp/ex-script.conf load complete

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Merging a Snippet

To merge a snippet, follow these steps:

1. From the HTML or PDF version of the manual, copy a configuration snippet into a text file, save the file with a name, and copy the file to a directory on your routing platform.

For example, copy the following snippet to a file and name the file ex-script-snippet.conf. Copy the ex-script-snippet.conf file to the /var/tmp directory on your routing platform.

commit {

file ex-script-snippet.xsl; }

2. Move to the hierarchy level that is relevant for this snippet by issuing the following configuration mode command:

[edit] user@host# edit system scripts [edit system scripts]

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3. Merge the contents of the file into your routing platform configuration by issuing the load merge relative configuration mode command:

[edit system scripts] user@host# load merge relative /var/tmp/ex-script-snippet.conf load complete

For more information about the load command, see CLI Explorer.

Documentation Conventions

Table 1 on page xiv defines notice icons used in this guide.

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Table 1: Notice Icons

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DescriptionMeaningIcon

Indicates important features or instructions.Informational note

Caution

Indicates a situation that might result in loss of data or hardware damage.

Alerts you to the risk of personal injury or death.Warning

Alerts you to the risk of personal injury from a laser.Laser warning

Indicates helpful information.Tip

Alerts you to a recommended use or implementation.Best practice

Table 2 on page xiv defines the text and syntax conventions used in this guide.

Table 2: Text and Syntax Conventions

ExamplesDescriptionConvention

Fixed-width text like this

Italic text like this

Represents text that you type.Bold text like this

Represents output that appears on the terminal screen.

Introduces or emphasizes important

•

new terms.

Identifies guide names.

•

Identifies RFC and Internet draft

•

titles.

To enter configuration mode, type the configure command:

user@host> configure

user@host> show chassis alarms

No alarms currently active

A policy term is a named structure

•

that defines match conditions and actions.

Junos OS CLI User Guide

•

RFC 1997, BGP Communities

•

Attribute

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Table 2: Text and Syntax Conventions (continued)

ExamplesDescriptionConvention

Italic text like this

Text like this

< > (angle brackets)

| (pipe symbol)

Represents variables (options for which you substitute a value) in commands or configuration statements.

Represents names of configuration statements, commands, files, and directories; configuration hierarchy levels; or labels on routing platform components.

variables.

Indicates a choice between the mutually exclusive keywords or variables on either side of the symbol. The set of choices is often enclosed in parentheses for clarity.

Configure the machine’s domain name:

[edit] root@# set system domain-name

domain-name

To configure a stub area, include

•

the stub statement at the [edit protocols ospf area area-id]

hierarchy level.

The console port is labeled

•

CONSOLE.

stub <default-metric metric>;Encloses optional keywords or

broadcast | multicast

(string1 | string2 | string3)

# (pound sign)

[ ] (square brackets)

Indention and braces ( { } )

; (semicolon)

GUI Conventions

Indicates a comment specified on the same line as the configuration statement to which it applies.

Encloses a variable for which you can substitute one or more values.

Identifies a level in the configuration hierarchy.

Identifies a leaf statement at a configuration hierarchy level.

rsvp { # Required for dynamic MPLS only

community name members [ community-ids ]

[edit] routing-options {

static {

route default {

nexthop address; retain;

}

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Table 2: Text and Syntax Conventions (continued)

xvi

ExamplesDescriptionConvention

Bold text like this

> (bold right angle bracket)

Represents graphical user interface (GUI) items you click or select.

Separates levels in a hierarchy of menu selections.

In the Logical Interfaces box, select

•

All Interfaces.

To cancel the configuration, click

•

Cancel.

In the configuration editor hierarchy, select Protocols>Ospf.

Documentation Feedback

We encourage you to provide feedback so that we can improve our documentation. You can use either of the following methods:

Online feedback system—Click TechLibrary Feedback, on the lower right of any page on the Juniper

•

Networks TechLibrary site, and do one of the following:

Click the thumbs-up icon if the information on the page was helpful to you.

•

Click the thumbs-down icon if the information on the page was not helpful to you or if you have

•

suggestions for improvement, and use the pop-up form to provide feedback.

E-mail—Send your comments to techpubs-comments@juniper.net. Include the document or topic name,

•

URL or page number, and software version (if applicable).

Requesting Technical Support

Technical product support is available through the Juniper Networks Technical Assistance Center (JTAC). If you are a customer with an active Juniper Care or Partner Support Services support contract, or are

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covered under warranty, and need post-sales technical support, you can access our tools and resources online or open a case with JTAC.

JTAC policies—For a complete understanding of our JTAC procedures and policies, review the JTAC User

•

Guide located at https://www.juniper.net/us/en/local/pdf/resource-guides/7100059-en.pdf.

Product warranties—For product warranty information, visit https://www.juniper.net/support/warranty/.

•

JTAC hours of operation—The JTAC centers have resources available 24 hours a day, 7 days a week,

•

365 days a year.

Self-Help Online Tools and Resources

For quick and easy problem resolution, Juniper Networks has designed an online self-service portal called the Customer Support Center (CSC) that provides you with the following features:

Find CSC offerings: https://www.juniper.net/customers/support/

•

Search for known bugs: https://prsearch.juniper.net/

•

xvii

Find product documentation: https://www.juniper.net/documentation/

•

Find solutions and answer questions using our Knowledge Base: https://kb.juniper.net/

•

Download the latest versions of software and review release notes:

•

https://www.juniper.net/customers/csc/software/

Search technical bulletins for relevant hardware and software notifications:

•

https://kb.juniper.net/InfoCenter/

Join and participate in the Juniper Networks Community Forum:

•

https://www.juniper.net/company/communities/

Create a service request online: https://myjuniper.juniper.net

•

To verify service entitlement by product serial number, use our Serial Number Entitlement (SNE) Tool:

https://entitlementsearch.juniper.net/entitlementsearch/

Creating a Service Request with JTAC

You can create a service request with JTAC on the Web or by telephone.

Visit https://myjuniper.juniper.net.

•

Call 1-888-314-JTAC (1-888-314-5822 toll-free in the USA, Canada, and Mexico).

•

For international or direct-dial options in countries without toll-free numbers, see

https://support.juniper.net/support/requesting-support/.

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CHAPTER

Overview

QFX5120 System Overview | 21

QFX5120 Chassis | 32

QFX5120 Cooling System | 41

QFX5120 Power System | 49

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QFX5120 System Overview

IN THIS SECTION

QFX5120 Switches Hardware Overview | 21

QFX5120 Switch Models | 28

Identifying QFX5120 Switch Models | 30

Chassis Physical Specifications for QFX5120 Switches | 31

Field-Replaceable Units in QFX5120 Switches | 32

QFX5120 Switches Hardware Overview

IN THIS SECTION

Benefits of the QFX5120 Switch | 22

QFX5120 Hardware | 22

System Software | 27

QFX5120 Power System | 27

The QFX5120 switch delivers low latency, rich Layer 2 and Layer 3 features, and offer ideal data center top-of-rack and aggregation switches for enterprise multicloud deployments. Featuring Layer 3 gateway capabilities for routing between virtualized and bare-metal servers, the QFX5120 is designed for extremely agile data centers that demand support for overlay and underlay network architectures. The QFX5120 includes native 25-Gigabit Ethernet (fiber only) and 100-Gigabit Ethernet fixed-configuration options with rich L2, L3, Ethernet VPN (EVPN), and MPLS features. In addition to a high-throughput Packet Forwarding Engine (PFE), the performance of the QFX5120 control plane is with a powerful 2.2 GHz quad-core Intel CPU with 16 GB of memory and 64 GB SSD storage.

The QFX5120 line of switches includes two compact, 1-U platforms that provide wire-speed packet performance, very low latency, and a rich set of Junos OS features. The native 25-GbE with 100-GbE uplink ports on QFX5120-48Y, combined with 32 ports of 100-GbE on the 1-Unit QFX5120-32C, also make the QFX5120 switch ideally suited for spine-and-leaf network deployments.

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Two variants of the QFX5120 switches are available— 32-port and 48-port switches, with AC and DC power supplies and with different airflow directions. The QFX5120-48Y switch offers two models featuring AC power supplies with front-to-back or back-to-front airflow, and two models featuring DC power supplies with front-to-back or back-to-front airflow. The QFX5120-32C switch offers two models featuring AC power supplies with front-to-back or back-to-front airflow.

NOTE: The QFX5120-32C switch currently supports only AC power supply.

Benefits of the QFX5120 Switch

EVPN-VXLAN campus architecture—The QFX5120 switch extends EVPN-VXLAN beyond the data center, thus providing customers the building blocks for an enterprise-wide fabric. The EVPN-VXLAN protocol is suitable for campus architectures because it provides Layer 3 transport with Layer 2 capabilities that allow enterprises to evolve, while also taking into consideration legacy applications. QFX5120 also offers core aggregation capabilities aimed at enterprises with campus networks that want a compact and highly scalable solution.

Industry-leading 25-Gbps and 100-Gbps wire speeds: The QFX5120 Switch offers industry-leading high density 25-Gbps and 100-Gbps wire speeds that support 48 ports at 100-Gbps or 48 ports at 25-Gbps, and 8 100-Gbps uplink ports.

Common data center protocols: The QFX5120 also uses data center network protocols. The network protocols used in the QFX5120 are the Ethernet VPN (EVPN) and the Virtual Extensible LAN (VXLAN). Engineers typically use it with the Border Gateway Protocol and the VXLAN encapsulation protocol which creates an overlay network on an existing Layer 3 infrastructure. As a result, the same engineering team can manage the data center and the campus.

QFX5120 Hardware

The QFX5120 delivers low-latency, native 25-GbE, rich Layer 2 and Layer 3 features, VXLAN overlay support, and 100GbE uplinks, making it the ideal switch for access and top-of-rack deployments.

Two variants of QFX5120 switches are available, QFX5120-32C and QFX5120-48Y.

Figure 1 on page 22 shows the front view of the QFX5120-32C switch.

Figure 1: QFX5120-32C - Front View

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Figure 2 on page 23 shows the rear view of the QFX5120-32C switch.

Figure 2: QFX5120-32C - Rear View

Figure 3 on page 23 shows the front view of the QFX5120-48Y switch.

Figure 3: QFX5120-48Y - Front View

Figure 4 on page 23 shows the front view of the QFX5120-48Y switch.

Figure 4: QFX5120-48Y - Rear View

The QFX5120-32C offers 32 quad SFP28 (QSFP28) or 32 quad SFP+ (QSFP+) ports. Each of the 100-GbE ports can also be configured as 4x25GbE ports using breakout cables, enabling the QFX5120-32C to also be used as a high-density 25-GbE top-of-rack switch.

The QFX5120-48Y switch is a 25-Gigabit Ethernet small form-factor pluggable (SFP28) switch with 48 SFP28 ports and eight 100-Gbps quad small form-factor pluggable (QSFP28) ports. Each SFP28 port can operate as a native 25-Gigabit Ethernet port, 10-Gigabit Ethernet port, and can act as a 1-Gbps port based on the transceivers inserted. Each of the eight uplink ports can operate as either 100-G or 40-G based on the optics used.

You can use breakout cables to configure the ports as per your requirement in QFX5120-32C and QFX5120-48Y switches.

You can configure a 40-Gigabit Ethernet port into 4 independent 10-Gigabit Ethernet ports using four

•

10-Gigabit breakout cables.

You can configure a 100-Gigabit Ethernet port into 2 independent 50-Gigabit Ethernet ports using two

•

50-Gigabit breakout cables.

You can configure a 100-Gigabit Ethernet port into 4 independent 25-Gigabit Ethernet ports using four

•

25-Gigabit breakout cables.

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NOTE:

g051100

432

6 5 37

QFX5120-32C

The SFP-T transceivers are supported only on top or bottom ports, upto a maximum of 24 ports.

•

The SFP28 speed can be applied only for individual quads (four ports). The speed cannot be

•

configured for a single port.

The native 25-G ports available from port 0 through port 47 and can operate in 1-G, 10-G, or

•

25-G speeds based on the configuration set at the quad level. The QFX-512048Y switch offers 10-G interface support by default. You need to manually configure 1-G and 25-G interface speeds in order to support 1-G and 25-G optics when required. To support 10-G speed for the same port slot, you need to delete the 1-G/ 25-G port configuration that was set earlier.

For QFX5120-32C, you cannot configure four independent 10-Gigabit ports or four independent

•

25-Gigabit ports using breakout cables on port 31. However you can configure two independent 50-G ports on this port.

Both the QFX5120-32C and QFX5120-48Y offer :

A 2.2 GHz quad-core Intel CPU with 16 GB memory and 64 GB SSD storage

•

Feature-rich automation capabilities with support for Python and Zero Touch Provisioning (ZTP)

•

Support for Virtual Extensible LAN (VXLAN) as an L2 or L3 gateway and Open vSwitch Database (OVSDB)

•

protocol as an L2 gateway

Advanced Junos OS features such as EVPN, BGP add-path, MPLS, L3 VPN, and IPv6 6PE

•

Figure 5 on page 24 show the front panel of a QFX5120-32C Switch.

Figure 5: Front Panel of a QFX5120-32C Switch

5—1— Console portQSFP28 ports

6—2— Chassis status LEDManagement port

7—3— Reset buttonSFP+ ports

4—USB port

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and Figure 6 on page 25 shows the front panel of a QFX5120-48Y switch.

g022500

1 2

g051102

2 1

g051002

1 3 4

5 6

12 11 10 89 7 7

Figure 6: Front Panel of a QFX5120-48Y Switch

2—1— QSFP portsSFP ports

Figure 8 on page 25 shows the rear panel of a QFX5120-32C switch with AC power supplies.

Figure 7: Rear Panel of a QFX5120-32C Switch with AC Power Supplies

2—1— Fan modulesAC power supply in slot 0, AC power supply in slot

Figure 7 on page 25 shows the rear panel of a QFX5120-48Y switch with AC Power Supplies.

Figure 8: Components on the Rear Panel of a QFX5120-48Y Switch with AC Power Supplies

7—1— Power Supply LEDsChassis Status LEDs

8—2— Fan Module LEDsConsole Port

9—3— RJ-45 Management Port (C0)RJ-45 Management Port (C1)

10—4— Reset ButtonESD Point

11—5— USB PortFan Module

12—6— CLEI LabelPower Supplies

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Figure 9 on page 26 shows the rear view of a QFX5120-48Y switch with DC Power Supplies.

g022506

Figure 9: Rear Panel of a QFX5120-48Y Switch with DC Power Supplies

Figure 10 on page 26 shows the components on the rear panel of a QFX5120-48Y switch with DC Power

Supplies.

Figure 10: Components on the Rear Panel of a QFX5120-48Y Switch with DC Power Supplies

7—1— Power Supply LEDsChassis Status LEDs

8—2— Fan Module LEDsConsole Port

9—3— RJ-45 Management Port (C0)RJ-45 Management Port (C1)

10—4— Reset ButtonESD Point

11—5— USB PortFan module

12—6— CLEI LabelPower Supplies

Table 3 on page 26 lists the QFX5120 switch models and their components.

Table 3: Components in QFX5120 Switches

Fan Modules Shipped by DefaultBuilt-in PortsSwitch Models

QFX5120-32C-AFO

32x100G QSFP28 ports and 2x10G SFP+ ports

Six fan modules; each with an AIR OUT (AFO) label.

Power Supply Shipped by Default

Two 650 W AC power supplies (1+1 redundancy).

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Table 3: Components in QFX5120 Switches (continued)

QFX5120-32C-AFI

QFX5120-48Y-AFO2

QFX5120-48Y-AFI2

QFX5120-48Y-DC-AFO2

QFX5120-48Y-DC-AFI2

System Software

32x100G QSFP28 ports and 2x10G SFP+ ports

48x25G SFP28 ports and 8x100G QSFP28 ports

Fan Modules Shipped by DefaultBuilt-in PortsSwitch Models

Six fan modules; each with an AIR IN (AFI) label.

Five fan modules; each with an AIR OUT (AFO) label.

Five fan modules; each with an AIR IN (AFI) label.

Five fan modules; each with an AIR OUT (AFO) label.

Five fan modules; each with an AIR IN (AFI) label.

Power Supply Shipped by Default

Two 650 W AC power supplies (1+1 redundancy).

Two 650 W DC power supplies (1+1 redundancy).

Juniper Networks QFX Series Ethernet Switches run Junos OS™ operating system (Junos OS), which provides Layer 2 and Layer 3 switching, routing, and security services.

QFX5120 Power System

QFX5120-48Y switches support two AC or DC power supplies with different airflow directions. Power supplies for the QFX5120 switch are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs. The QFX5120 switch models are shipped with two power supplies pre-installed in the rear panel of the chassis.

CAUTION: Do not mix:

AC and DC power supplies in the same chassis.

•

Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the

•

same chassis.

Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR

•

OUT (AFO)) in the same chassis.

Page 26

CAUTION: Verify that the airflow direction on the power supply handle matches the

direction of airflow in the chassis. Ensure that each power supply you install in the chassis has the same airflow direction. If you install power supplies with two different airflow directions, Junos OS raises an alarm. If you need to convert the airflow pattern on a chassis, you must replace all the fans and power supplies at one time to use the new direction.

QFX5120 Switch Models

The QFX5120 switch is available with 32 or 48 ports and support AC and DC power supplies depending on the switch model. All models of the QFX5120 ship with two power supplies and five fans installed by default.Table 4 on page 28 lists the components shipped with QFX5120 switch models.

Table 4: QFX5120 Switch Models and Shipped Components

Product Numbers

QFX5120-32C-AFO

32 QSFP28

QFX5120-32C-AFI

32 QSFP28

AC2 SFP+

AirflowPower SupplyPorts

Front-to-back—air intake to cool the chassis is through the vents on the front panel of the chassis, and hot air exhausts through the vents on the rear panel of the chassis.

Back-to-front—air intake to cool the chassis is through the vents on the rear panel of the chassis, and hot air exhausts through the vents on the front panel of the chassis.

Page 27

Table 4: QFX5120 Switch Models and Shipped Components (continued)

Product Numbers

AirflowPower SupplyPorts

QFX5120-48Y-AFO2

QFX5120-48Y-AFI2

QFX5120-48Y-DC-AFO2

8 QSFP28

AC48 SFP28

DC48 SFP28

Front-to-back—air intake to cool the chassis is through the vents on the front panel of the chassis, and hot air exhausts through the vents on the rear panel of the chassis.

Back-to-front—air intake to cool the chassis is through the vents on the rear panel of the chassis, and hot air exhausts through the vents on the front panel of the chassis.

Front-to-back—air intake to cool the chassis is through the vents on the front panel of the chassis, and hot air exhausts through the vents on the rear panel of the chassis.

QFX5120-48Y-DC-AFI2

CAUTION: Mixing different types (AC and DC) of power supplies in the same chassis is

not supported. Mixing different airflow modules in the same chassis is not supported.

8 QSFP28

DC48 SFP28

Back-to-front—air intake to cool the chassis is through the vents on the rear panel of the chassis, and hot air exhausts through the vents on the front panel of the chassis.

Page 28

Identifying QFX5120 Switch Models

Purpose

Identify the model number of your QFX5120 switch.

Action Check the value of the FRU Model Number field in the Routing Engine section in the output of the show

chassis hardware extensive CLI command.

user@switch> show chassis hardware extensive

....

Routing Engine 1 REV D 650-044930 PD3113060024 QFX5120-48Y Jedec Code: 0x7fb0 EEPROM Version: 0x02 P/N: 650-044930 S/N: PD3113060024 Assembly ID: 0x0b5e Assembly Version: 03.19 Date: 02-19-2013 Assembly Flags: 0x00 Version: REV D CLEI Code: ID: QFX5120-48Y FRU Model Number: QFX5120-48Y-AFO2

....

The model number of your switch is one of the following:

QFX5120-32C-AFO

•

QFX5120-32C-AFI

•

QFX5120-48Y-AFO2

•

QFX5120-48Y-AFI2

•

QFX5120-48Y-DC-AFO2

•

QFX5120-48Y-DC-AFI2

•

In the sample output, the switch model is QFX5120-48Y-AFO2.

Meaning

In QFX5120 switch model numbers:

The 48Y in the model number indicates that the number of network ports on the switch:

•

AFI indicates that the switch is shipped with two fan modules and a power supply, each bearing an AIR

•

IN (AFI) label. Switches that do not have AFI in their model numbers ship with two fan modules and a power supply, each bearing an AIR OUT (AFO) label.

Page 29

The labels on the fan modules and the power supplies indicate the direction of airflow they provide within the chassis when installed in the switch. AIR IN (AFI) labels indicate back-to-front airflow, and AIR OUT (AFO) labels indicate front-to-back airflow.

The DC in the model number indicates that the switch model works on DC power supply. Switches that

•

do not have DC in their model numbers work on AC power supply.

Chassis Physical Specifications for QFX5120 Switches

The QFX5120 switch chassis is a rigid sheet-metal structure that houses all components of the switch.

Table 5 on page 31 shows the physical specifications of the QFX5120-32C switch.

Table 5: Physical Specifications of the QFX5120-32C Switch Chassis

ValueDescription

1.7 in. (43.25 mm)Chassis height

17.26 in. (438.4 mm)Chassis width

20.27 in. (515.0 mm) excluding fan and power supply handlesChassis depth

21.12 lbs (9.12 kg) with two power supplies and fans installedWeight

Table 6 on page 31 shows the physical specifications of the QFX5120-32C switch chassis.

Table 6: Physical Specifications of the QFX5120-48Y Switch Chassis

ValueDescription

1.72 in. (4.37 cm)Chassis height

Chassis width

17.36 in. (44.09 cm)

•

The outer edges of the front-mounting brackets extend the width to 19 in.

•

(48.2 cm)

20.48 in. (52.02 cm) excluding fan and power supply handlesChassis depth

23.69 lbs (10.75 kg) with two power supplies and fans installedWeight

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Field-Replaceable Units in QFX5120 Switches

Field-replaceable units (FRUs) are components that you can replace at your site. The FRUs in QFX5120 switches are hot-removable and hot-insertable: You can remove and replace them without powering off the switch. The FRUs in QFX5120 switches are:

Power supplies

•

Fan modules

•

Transceivers

•

NOTE: Transceivers are not part of the shipping configuration. If you want to purchase any of

these components, you must order them separately.

NOTE: If you have a Juniper J-Care service contract, register any addition, change, or upgrade of

hardware components at https://www.juniper.net/customers/support/tools/updateinstallbase/. Failure to do so can result in significant delays if you need replacement parts. This note does not apply if you replace existing components with the same type of component.

QFX5120 Chassis

IN THIS SECTION

QFX5120 Cooling System | 33

Management Port LEDs on QFX5120 Switches | 37

Network Port LEDs on QFX5120 Switches | 38

Page 31

QFX5120 Cooling System

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Ports FRUs

IN THIS SECTION

QFX5120 Models with Front-to-Back Airflow | 33

QFX5120 Models with Back-to-Front Airflow | 34

Positioning the Switch | 36

QFX5120 Fan Module Status | 36

QFX5120 Models with Front-to-Back Airflow

In the QFX5120 switch models that have front-to-back airflow, the air intake to cool the chassis is through the vents on the front panel of the switch, and hot air exhausts through the vents on the rear panel.

Figure 11 on page 33 shows the front-to-back airflow through a QFX5120-32C switch chassis.

Figure 11: Front-to-Back Airflow Through QFX5120-32C Switch Chassis

Figure 12 on page 34 shows the front-to-back airflow through a QFX5120-48Y switch chassis.

Page 32

Figure 12: Front-to-Back Airflow Through QFX5120-48Y Switch Chassis

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Ports

FRUs

You must install only power supplies that have AIR OUT (AFO) labels in switches in which the fan modules have AIR OUT (AFO) labels.

QFX5120 Models with Back-to-Front Airflow

In the QFX5120 switch models that have back-to-front airflow, the air intake to cool the chassis is through the vents on the rear panel, and hot air exhausts through the vents on the front panel of the switch.

Figure 13 on page 35 shows the back-to-front airflow through QFX5120-32C switch chassis.

Page 33

Figure 13: Back-to-Front Airflow Through a QFX5120-32C Switch Chassis

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Ports FRUs

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Ports

FRUs

Figure 14 on page 35 shows the back-to-front airflow through the QFX5120-48Y switch chassis.

Figure 14: Back-to-Front Airflow Through QFX5120-48Y Switch Chassis

You must install only power supplies that have AIR IN (AFI) labels in switches in which the fan modules have AIR IN (AFI) labels.

The labels on the power supplies and fan modules must match the labels on the switch chassis.

Mixing components with AIR IN (AFI) and AIR OUT (AFO) labels in the same chassis hampers the performance of the cooling system of the switch and leads to overheating of the chassis.

Page 34

CAUTION: The system raises an alarm if a fan module fails or if the ambient temperature

inside the chassis rises above the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the system shuts down automatically.

Positioning the Switch

In a switch with front-to-back airflow, indicated by the label AIR OUT (AFO) on the fan modules and power supplies, hot air exhausts through the vents on the rear panel of the switch. In a switch with back-to-front airflow, indicated by the label AIR IN (AFI) on the fan modules and power supplies, hot air exhausts through the vents on the front panel of the switch.

In data center deployments, position the switch in such a manner that the AIR IN (AFI) labels on the switch components are next to the cold aisle, and the AIR OUT (AFO) labels on the switch components are next to the hot aisle.

QFX5120 Fan Module Status

A QFX5120 switch has a status LED for each fan module next to the fan module slot on the rear panel of the chassis. The status LED indicates the status of the fan module. Table 7 on page 36 describes the status LED on the fan module of a QFX5120 switch.

Table 7: Fan Module Status LED

DescriptionStateColorLED

The fan module is functioning normally.On steadilyGreenStatus

BlinkingAmber

Under normal operating conditions, the fan modules operate at a moderate speed. Temperature sensors in the chassis monitor the temperature within the chassis.

An error has been detected in the fan module. Either the fan has failed or it is seated incorrectly. Replace the fan module as soon as possible. To maintain proper airflow through the chassis, leave the fan module installed in the chassis until you are ready to replace it.

CAUTION: The system raises an alarm if a fan module fails or if the ambient temperature

inside the chassis rises above the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the system shuts down automatically.

Page 35

Management Port LEDs on QFX5120 Switches

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The two management port LEDs on the rear panel of a QFX5120 switch have two LEDs that indicate link activity and status of the management port. Figure 15 on page 37 shows the location of management port on QFX5120-32C.

Figure 15: LEDs on the QFX5120-32C Management Port

1—Link/Activity LED

Figure 16 on page 37 shows the location of management port on QFX5120-48Y.

Figure 16: LEDs on the QFX5120-48Y Management Port

2—1— Link/Activity LEDStatus LED

Table 8 on page 37 shows the link/activity LED on the management port on QFX5120 switches.

Table 8: Link/Activity LED on the Management Port on QFX5120 Switches

State and DescriptionColorLED

GreenLink/Activity

Blinking— The port and the link are active, and there is link activity.

•

On steadily— The port and the link are active, but there is no link activity.

•

Off— The port is not active.

•

Page 36

Table 8: Link/Activity LED on the Management Port on QFX5120 Switches (continued)

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Bi-colored LEDs

State and DescriptionColorLED

Green/AmberStatus

Indicates the speed. The speed indicators are:

Off— Either the port speed is 10 M or the link is down.

•

Amber— Link speed is 100 Mbps.

•

Green— Link speed is 1000 Mbps.

•

Network Port LEDs on QFX5120 Switches

Each network port and QSFP28 port have two LEDs that show the link activity and status of the port. Each QSFP28 on a QFX5120-32C switch has four LEDs. The first LED is for non-channelized ports and the other three are for channelized ports.The built-in QSFP28 port on a QFX5120-48Y switch has four LEDs that shows both the link activity and status of the port in a QFX5120-48Y switch.

Figure 17 on page 38 shows the LEDs on the QSFP28 network ports on QFX5120-32C.

Figure 17: LEDs on the QSFP28 Network Ports (QFX5120-32C)

Figure 18 on page 39 shows the LEDs on the SFP+ network ports on QFX5120-32C.

Page 37

Figure 18: LEDs on the SFP+ Network Ports (QFX5120-32C)

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1 2

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1 2

2—1— Status LED that denotes port 33Status LED that denotes port 32

Figure 19 on page 39 shows the LEDs on the QSFP28 network ports on QFX5120-48Y.

Figure 19: LEDs on the QSFP28 Network Ports (QFX5120-48Y)

1—Network Port LEDs.

Figure 20 on page 39 shows the LEDs on the QSFP28 network ports on QFX5120-48Y.

Figure 20: LEDs on the SFP28 Network Ports (QFX5120-48Y)

2—1— Status LEDLink/Activity LED

Each QSFP28 port on a QFX5120-32C switch has four LEDs which display the link activity and status of the port. The first LED denotes non-channelized ports and the other three denote channelized ports. Each QSFP28 port on the QFX5120-48Y switch has four LEDs. The first LED denotes the non-channelized

Page 38

ports and the other three denote the channelized ports. See Table 9 on page 40 to know about the different link activity LEDs on QSFP28 Network ports.

Table 9: Status LED on QSFP28 Ports

DescriptionStateColorPosition

OffUnlit1–4

On steadilyGreen1

Blinking

On steadilyGreen2-4

Blinking

BlinkingAmberAll

The port is administratively disabled, there is no power, the link is down, or there is a fault.

A link is established (either 100-Gigabit or 40-Gigabit, non-channelized) but there is no link activity. When this LED is on, the LEDs in positions 2 to 4 are off.

A link is established (either 100-Gigabit or 40-Gigabit, non-channelized) and there is link activity.

A 25/10 Gigabit link is established in channelized mode, but there is no link activity.

A 25/10 Gigabit link is established in channelized mode, and there is link activity.

All four LEDs blink to indicate the beacon function was enabled on the port.

NOTE: Note that the beacon function is

not available for the QFX5120-32C switch.

Table 10 on page 40 describes the link activity LED on SFP28 and SFP+ Network ports.

Table 10: LED Link/Activity LED on SFP28 and SFP+ Ports

State and DescriptionColorLED

GreenLink activity

Blinking—The port and the link are active, and there is link activity.

•

On steadily—The port and the link are active, but there is no link activity.

•

Off—The port is not active.

•

Table 11 on page 41 describes the status LED on SFP28 and SFP+ ports.

Page 39

Table 11: Status LED on SFP28 and SFP+ Uplink Ports

State and DescriptionColorLED

GreenStatus

Indicates the speed. The speed indicators are:

Blinking green—1 Gbps and 10 Gbps

•

Steadily green—25 Gbps

•

QFX5120 Cooling System

IN THIS SECTION

QFX5120 Cooling System | 42

QFX5120 Models and Airflow Direction | 43

QFX5120 Models with Front-to-Back Airflow | 45

QFX5120 Models with Back-to-Front Airflow | 47

Positioning the Switch | 48

QFX5120 Fan Module Status | 49

The cooling system in a QFX5120 device consists of fan modules and the fans that are part of the power supplies. The QFX5120-32C has six fan modules, and the QFX5120-48Y has five fan modules. You can order a QFX5120 that works in one of two airflow directions. The airflow direction depends on the fan modules and power supplies that are installed in the switch. QFX5120 switches provide back-to-front airflow (air enters through the back of the switch), indicated by the label AIR IN, or front-to-back (air exhausts through the back of the switch), indicated by the label AIR OUT—depending on the fan modules and power supplies installed in the switch.

CAUTION: You must not mix fan modules and power supplies with different airflow

directions in the same chassis.

Page 40

QFX5120 Cooling System

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QFX5120-48Y switches are shipped with five fan modules (4+1 redundancy) preinstalled at the rear of the chassis. QFX5120-32C switches are shipped with six fan modules (5+1 redundancy) preinstalled at the rear of the chassis. These fan modules are designed for one of the two available airflow directions (Airflow In or Airflow Out). The fan modules are also color-coded according to the airflow direction.

Figure 21 on page 42 shows the QFX5120-32C fan module.

Figure 21: QFX5120-32C -AFI Fan Module

Figure 22 on page 42 shows the QFX5120-48Y fan module.

Figure 22: QFX5120-48Y-AFI2 Fan Module

For QFX5120-32C, the six fan modules are numbered 0 through 5 counting from left to right. For QFX5120-48Y, the five fan modules are numbered 0 through 4 counting from left to right. Each fan module slot has a fan icon and an LED next to it.

Page 41

CAUTION: Do not mix:

Fan modules with different airflow labels (AIR IN and AIR OUT) in the same chassis.

•

Power supplies with different airflow labels (AIR IN and AIR OUT) in the same chassis.

•

Fan modules and power supplies with different airflow labels (AIR IN and AIR OUT) in

•

the same chassis.

While replacing fan modules, you must remove only one fan module at a time from the rear panel of the chassis. The switch continues to operate for a limited period of time (30 seconds) without thermal shutdown while a fan module is being replaced..

NOTE: All the fan modules must be installed for optimal functioning of the switch.

The fan modules are available in two models that have different airflow directions.

Back-to-front (air enters through the back of the switch), indicated by label AIR IN and azure blue color

•

Front-to-back (air exhausts through the back of the switch), indicated by label AIR OUT and gold color.

•

QFX5120 Models and Airflow Direction

Table 12 on page 43 shows the airflow direction in QFX5120 switch models.

Table 12: Airflow Direction in QFX5120 Switch Models

Direction of Airflow in the Fan Module

Front-to-back—air intake to cool the chassis is through the vents on the front panel of the chassis, and hot air exhausts through the vents on the rear panel of the chassis.

Power Supplies

For switches that have fan modules with the AIR OUT label, you must install only power supplies that have the AIR OUT label.

QFX5120-32C-AFO

Fan Modules and Power SupplyModel Number

with six fan modules and two AC power supplies, each with a label AIR OUT.

Color of the Fan Module

Juniper GoldThe switch ships

Page 42

Table 12: Airflow Direction in QFX5120 Switch Models (continued)

Fan Modules and Power SupplyModel Number

Color of the Fan Module

Direction of Airflow in the Fan Module

Power Supplies

QFX5120-32C-AFI

QFX5120-48Y-AFO2

with six fan modules and two AC power supplies, each with a label AIR IN.

with five fan modules and two AC power supplies, each with a label AIR OUT.

Juniper Azure BlueThe switch ships

Juniper GoldThe switch ships

Back-to-front—air intake to cool the chassis is through the vents on the rear panel of the chassis, and hot air exhausts through the vents on the front panel of the chassis.

Front-to-back—air intake to cool the chassis is through the vents on the front panel of the chassis, and hot air exhausts through the vents on the rear panel of the chassis.

For switches that have fan modules with the AIR IN label, you must install only power supplies that have the AIR IN label.

For switches that have fan modules with the AIR OUT label, you must install only power supplies that have the AIR OUT label.

QFX5120-48Y-AFI2

with five fan modules and two AC power supplies, each with a label AIR IN.

Juniper Azure BlueThe switch ships

Back-to-front—air intake to cool the chassis is through the vents on the rear panel of the chassis, and hot air exhausts through the vents on the front panel of the chassis.

For switches that have fan modules with the AIR IN label, you must install only power supplies that have the AIR IN label.

Page 43

Table 12: Airflow Direction in QFX5120 Switch Models (continued)

Fan Modules and Power SupplyModel Number

Color of the Fan Module

Direction of Airflow in the Fan Module

Power Supplies

QFX5120-48Y-DC-AFO2

QFX5120-48Y-DC-AFI2

with five fan modules and two DC power supplies, each with a label AIR OUT.

with five fan modules and two DC power supplies, each with a label AIR IN.

Juniper GoldThe switch ships

Juniper Azure BlueThe switch ships

Front-to-back—air intake to cool the chassis is through the vents on the front panel of the chassis, and hot air exhausts through the vents on the rear panel of the chassis.

Back-to-front—air intake to cool the chassis is through the vents on the rear panel of the chassis, and hot air exhausts through the vents on the front panel of the chassis.

For switches that have fan modules with the AIR OUT label, you must install only power supplies that have the AIR OUT label.

For switches that have fan modules with the AIR IN label, you must install only power supplies that have the AIR IN label.

CAUTION: Do not mix:

AC and DC power supplies in the same chassis.

•

Fan modules and power supplies with different airflow directions in the same chassis.

•

Power supplies and fan modules with different airflow labels (AIR IN and AIR OUT) in

•

the same chassis.

QFX5120 Models with Front-to-Back Airflow

In the QFX5120 switch models that have front-to-back airflow, the air intake to cool the chassis is through the vents on the front panel of the switch and hot air exhausts through the vents on the rear panel.

Page 44

Figure 11 on page 33 shows the front-to back airflow through the QFX5120-32C switch chassis.

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Ports FRUs

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Ports

FRUs

Figure 23: Front-to-Back Airflow Through QFX5120-32C Switch Chassis

Figure 12 on page 34 shows the front-to-back airflow through the QFX5120-48Y switch chassis.

Figure 24: Front-to-Back Airflow Through QFX5120-48Y Switch Chassis

You must install only power supplies that have AIR OUT labels in switches in which the fan modules have AIR OUT labels.

Page 45

QFX5120 Models with Back-to-Front Airflow

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Ports FRUs

In the QFX5120 switch models that have back-to-front airflow, the air intake to cool the chassis is through the vents on the rear panel and hot air exhausts through the vents on the front panel of the switch.

Figure 13 on page 35 shows the back-to-front airflow through QFX5120-32C switch chassis.

Figure 25: Back-to-Front Airflow Through QFX5120-32C Switch Chassis

Figure 14 on page 35 shows the back-to-front airflow through the QFX5120-48Y switch chassis.

Page 46

Figure 26: Back-to-Front Airflow Through QFX5120-48Y Switch Chassis

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Ports

FRUs

You must install only power supplies that have AIR IN labels in switches in which the fan modules have AIR IN labels.

Do not mix power supplies and fan modules with different airflow labels (AIR IN and AIR OUT) in the same chassis. If the fan modules have AIR IN labels, the power supplies must also have AIR IN labels; if the fan modules have AIR OUT labels, the power supplies must also have AIR OUT labels.

The labels on the power supplies and fan modules should match the labels on the switch chassis.

Mixing components with AIR IN and AIR OUT labels in the same chassis hampers the performance of the cooling system of the switch and leads to overheating of the chassis.

CAUTION: The system raises an alarm if a fan module fails or if the ambient temperature

inside the chassis rises above the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the system shuts down automatically.

Positioning the Switch

In front-to-back airflow, indicated by the label AIR OUT on the fan modules and power supplies, hot air exhausts through the vents on the rear panel of the switch. In back-to-front airflow, indicated by the label AIR IN on the fan modules and power supplies, hot air exhausts through the vents on the front panel of the switch.

Page 47

In data center deployments, position the switch in such a manner that the AIR IN labels on switch components are next to the cold aisle, and AIR OUT labels on switch components are next to the hot aisle.

QFX5120 Fan Module Status

Each switch has a status LED for each fan module next to the fan module slot on the rear panel of the chassis. The Status LED indicates the status of the fan module. Table 7 on page 36 describes the Status LED on the fan module in an QFX5120 switch.

Table 13: Fan Module Status LED

DescriptionStateColorLED

The fan module is functioning normally.On steadilyGreenStatus

BlinkingAmber

Under normal operating conditions, the fan modules operate at a moderate speed. Temperature sensors in the chassis monitor the temperature within the chassis.

The system raises an alarm if a fan module fails or if the ambient temperature inside the chassis rises above the acceptable range. If the temperature inside the chassis rises above the threshold temperature, the system shuts down automatically.

An error has been detected in the fan module. Replace the fan module as soon as possible. Either the fan has failed or it is seated incorrectly. To maintain proper airflow through the chassis, leave the fan module installed in the chassis until you are ready to replace it.

QFX5120 Power System

IN THIS SECTION

AC Power Supply in QFX5120 Switches | 50

AC Power Supply Specifications for QFX5120 Switches | 52

AC Power Cord Specifications for QFX5120 Switches | 53

AC Power Supply LEDs in QFX5120 Switches | 55

DC Power Supply in QFX5120 Switches | 57

Page 48

QFX5120 DC Power Specifications | 60

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DC Power Supply LEDs in QFX5120 Switches | 60

AC Power Supply in QFX5120 Switches

IN THIS SECTION

AC Power Supply Specifications for QFX5120 Switches | 50

AC Power Supply Airflow | 51

QFX5120 switches support two AC or DC power supplies with different airflow directions. Power supplies for the QFX5120 switch are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs. The QFX5120 switch models are shipped with two power supplies pre-installed in the rear panel of the chassis.

NOTE: Currently, QFX5120-32C switch supports only AC power supplies.

AC Power Supply Specifications for QFX5120 Switches

QFX5120 switches support two 650 W AC power supplies.

Figure 27 on page 50 shows the AC power supply for a QFX5120-32C switch.

Figure 27: AC Power Supply for a QFX5120-32C Switch

Page 49

Figure 28 on page 51 shows the AC power supply for a QFX5120-48Y switch.

Figure 28: AC Power Supply for a QFX5120-48Y Switch

AC Power Supply Airflow

Each power supply is cooled by its own internal cooling system.

The power supplies either have labels on the handles that indicate the direction of airflow or they have color-coded handles with a fan icon. AIR IN (AFI) label or a blue-colored handle indicates back-to-front airflow while AIR OUT (AFO) label or a gold-colored handle indicates front-to-back airflow. See

Figure 29 on page 51.

Figure 29: Power Supply Handle Detail

1—AIR IN (AFI) label

Be sure to use the correct power supply for your chassis product SKU (see ).

Page 50

CAUTION: Do not mix:

AC and DC power supplies in the same chassis.

•

Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the

•

same chassis.

Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR

•

OUT (AFO)) in the same chassis.

CAUTION: Verify that the airflow direction on the power supply handle matches the

Table 14 on page 52 lists the AC and DC power supplies used in QFX5120 switches and the direction of

airflow in them.

Table 14: Airflow Direction in Power Supplies for QFX5120 Switches

Color of Power Supply HandleDirection of AirflowProduct Number

Juniper GoldFront to backJPSU-650W-AC-AO

Juniper Azure BlueBack to frontJPSU-650W-AC-AI

AC Power Supply Specifications for QFX5120 Switches

QFX5120 switches support 650 W AC power supplies.

The tables in this topic provides power supply specification of AC power supplies used in an QFX5120 switch:

Table 15 on page 52 shows the power supply specifications for QFX5120-32C switches.

Table 15: Power Supply Specifications for QFX5120-32C Switches

Operating range: 100 VAC to 240 VACAC input voltage

Page 51

Table 15: Power Supply Specifications for QFX5120-32C Switches (continued)

50–60 HzAC input line frequency

AC input current rating

6A at 100 VAC

3.8A at 240 VAC

380WTypical Power Consumption

515WMaximum power

Table 16 on page 53shows the power supply specifications for QFX5120-48Y switches.

Table 16: Power Supply Specifications for QFX5120-48Y Switches

SpecificationItem

Operating range: 100 VAC to 240 VACAC input voltage

50–60 HzAC input line frequency

AC input current rating

7.8A at 100-120 VAC

3.8A at 200-240 VAC

260WTypical Power Consumption

450WMaximum power

AC Power Cord Specifications for QFX5120 Switches

A detachable AC power cord is supplied with the AC power supplies. The coupler is type C13 as described by International Electrotechnical Commission (IEC) standard 60320. The plug at the male end of the power cord fits into the power source outlet that is standard for your geographical location.

CAUTION: The AC power cord provided with each power supply is intended for use

with that power supply only and not for any other use.

Page 52

NOTE: In North America, AC power cords must not exceed 4.5 meters in length, to comply with

National Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and 210-52 and Canadian Electrical Code (CEC) Section 4-010(3). The cords supplied with the switch are in compliance.

Table 17 on page 54 shows the AC power cord specifications for the countries and regions listed in the

table.

Table 17: AC Power Cord Specifications

Juniper Model NumberPlug StandardsElectrical SpecificationsCountry/Region

CBL-EX-PWR-C13-ARIRAM 2073 Type RA/3250 VAC, 10 A, 50 HzArgentina

Switzerland, and United Kingdom)

Japan

Korea

250 VAC, 10 A, 50 HzAustralia

CBL-EX-PWR-C13-AUAS/NZZS 3112 Type

SAA/3

CBL-EX-PWR-C13-BRNBR 14136 Type BR/3250 VAC, 10 A, 50 HzBrazil

CBL-EX-PWR-C13-CHGB 1002-1996 Type PRC/3250 VAC, 10 A, 50 HzChina

CBL-EX-PWR-C13-EUCEE (7) VII Type VIIG250 VAC, 10 A, 50 HzEurope (except Italy,

CBL-EX-PWR-C13-INIS 1293 Type IND/3250 VAC, 10 A, 50 HzIndia

CBL-EX-PWR-C13-ILSI 32/1971 Type IL/3G250 VAC, 10 A, 50 HzIsrael

CBL-EX-PWR-C13-ITCEI 23-16 Type I/3G250 VAC, 10 A, 50 HzItaly

CBL-EX-PWR-C13-JPSS-00259 Type VCTF125 VAC, 12 A, 50 Hz or 60

CBL-EX-PWR-C13-KRCEE (7) VII Type VIIGK250 VAC, 10 A, 50 Hz or 60

CBL-EX-PWR-C13-USNEMA 5-15 Type N5-15125 VAC, 13 A, 60 HzNorth America

250 VAC, 10 A, 50 HzSouth Africa

ZA/13

CBL-EX-PWR-C13-SASABS 164/1:1992 Type

CBL-EX-PWR-C13-SZSEV 6534-2 Type 12G250 VAC, 10 A, 50 HzSwitzerland

Page 53

Table 17: AC Power Cord Specifications (continued)

g051109

Juniper Model NumberPlug StandardsElectrical SpecificationsCountry/Region

Taiwan

50 Hz

CBL-EX-PWR-C13-TWNEMA 5-15P Type N5-15P125 VAC, 11 A and 15 A,

CBL-EX-PWR-C13-UKBS 1363/A Type BS89/13250 VAC, 10 A, 50 HzUnited Kingdom

Figure 30 on page 55 illustrates the plug on the power cord for some of the countries or regions listed in Table 17 on page 54.

Figure 30: AC Plug Types

AC Power Supply LEDs in QFX5120 Switches

Figure 31 on page 55 shows the location of the LED on an AC power supply for QFX5120-32C switches.

Figure 31: AC Power Supply LED on AC Power Supply for QFX5120-32C Switches

1—Bicolored LED

Table 18 on page 56 describes the AC power supply LED on a QFX5120-32C switch.

Page 54

Table 18: AC Power Supply LED on a QFX5120-32C Switch

g022510

DescriptionStateColor

OffUnlit

The power supply is disconnected from power, or power is not coming into the power supply.

The power supply is sending out power correctly.On SteadilyGreen

The power supply is in standby mode.Blinking

On steadilyRed

An error has been detected in the power supply. Replace the power supply as soon as possible. To maintain proper airflow through the chassis, leave the power supply installed in the chassis until you are ready to replace it.

Blinking

The internal fan in the power supply has failed. Replace the power supply as soon as possible. To maintain proper airflow through the chassis, leave the power supply installed in the chassis until you are ready to replace it.

Figure 32 on page 56 shows the location of the LEDs on an AC power supply for QFX5120-48Y switches.

Figure 32: LEDs on AC power supply for QFX5120-48Y switches

3—1— FaultAC OK

2—DC OK

Table 19 on page 57 describes the AC power supply LEDs on QFX5120-48Y.

Page 55

Table 19: AC Power Supply LEDs on QFX5120-48Y Switches

DescriptionStateColorLED

OffUnlitAC OK

OffUnlitDC OK

On steadilyGreen

On steadilyAmberFault

The power supply is disconnected from power, or power is not coming into the power supply.

Power is coming into the power supply.On steadilyGreen

The power supply is disconnected from power, or power is not coming into the power supply.

The power supply is sending out power correctly.

NOTE: If the AC OK LED and the DC OK LED are not lit green, either the AC power cord is not

installed properly or the power input voltage is not within normal operating range.

If the AC OK LED is lit green and the DC OK LED is unlit or lit red, the AC power supply is installed properly, but the power supply has an internal failure.

DC Power Supply in QFX5120 Switches

IN THIS SECTION

Characteristics of a DC Power Supply | 58

DC Power Supply Airflow | 59

Page 56

The DC power supply in QFX5120 switches is a hot-insertable and hot-removable field-replaceable unit (FRU): You can install it without powering off the switch or disrupting the switching function.

All the QFX5120 switches that are powered by DC power supplies are shipped with one DC power supply pre-installed in the rear panel of the switches.

CAUTION: Do not mix:

AC and DC power supplies in the same chassis

•

Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the

•

same chassis.

Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same

•

chassis.

Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR

•

OUT (AFO)) in the same chassis.

This topic includes:

Characteristics of a DC Power Supply

QFX5120 switches support 650 W DC power supply (see Figure 33 on page 58).

Figure 33: DC Power Supply for an QFX5120 Switch

You can install up to two DC power supplies in an QFX5120 switch. Power supplies are installed in the power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.

Table 20 on page 59 lists the details of the 650 W DC power supplies used in QFX5120 switches.

Page 57

Table 20: Details of the DC Power Supplies in QFX5120 Switches

650 W DC Power SupplyDetails

Model number

Power supply slots

Airflow

JPSU-650-DC-AFO

•

JPSU-650-DC-AFI

•

Hot-insertable and hot-removableField-replaceable unit (FRU) type

2.43 lb (1.1 kg)Power supply weight

1Minimum installed in chassis

2Maximum installed in chassis

Install in power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.

InternalFans

Front-to-back, indicated by label AIR OUT (AFO)

•

Back-to-front, indicated by label AIR IN (AFI)

•

IN OK and OUT OKPower supply status LEDs

4 ADC input current rating

Operating range

–38 through –60 VDC

NOTE: The minimum input power required to power on the switch

is –43.5 +/– 0.5 VDC. After the switch is powered on, the operating range is –38 through –60 VDC.

To prevent electrical injury while installing or removing DC power supplies, carefully follow instructions in “Connecting DC Power to a QFX5120 Switch” on page 101 and “Maintaining the QFX5120 Power System”

on page 124

DC Power Supply Airflow

Each power supply has its own fan and is cooled by its own internal cooling system.

Each power supply has a label AIR OUT (AFO) or AIR IN (AFI) on the faceplate of the power supply that indicates the direction of airflow in the power supply.

Table 21 on page 60lists the DC power supply models and the direction of airflow in them.

Page 58

Table 21: Airflow Direction in DC Power Supply Models for QFX5120 Switches

Label on Power SupplyModel

Direction of Airflow

AIR OUT (AFO)JPSU-650-DC-AFO

AIR IN (AFI)JPSU-650-DC-AFI

Front-to-back—that is, air intake to cool the chassis is through the vents on the front panel of the chassis and hot air exhausts through the vents on the rear panel of the chassis.

Back-to-front—that is, air intake to cool the chassis is through the vents on the rear panel of the chassis and hot air exhausts through the vents on the front panel of the chassis.

QFX5120 DC Power Specifications

The typical and maximum power consumption values are calculated using dummy transceivers on all ports. Traffic is run at 25° C ambient.

Table 22: DC Power Specifications for QFX5120-48Y

SpecificationsItem

DC input voltage

Rated operating voltage: –48 VDC

•

to 60 VDC

Operating voltage range: 40.8 VDC

•

through 72 VDC

20 A maximumDC input current rating

260WTypical power consumption

450WMaximum power consumption

DC Power Supply LEDs in QFX5120 Switches

Figure 34 on page 61shows the location of the LEDs on the DC power supply.

Page 59

Figure 34: DC Power Supply Faceplate on a QFX5120-48Y Switch

3—1— Fault LEDInput LED

2—Output LED

CAUTION: The V+ terminals are shunted internally together, as are the V- terminals.

The same polarity terminal can be wired together from the same source to provide an additional current path in a higher power chassis. Do not connect the terminals to different sources.

Table 23 on page 61 describes the LEDs on the DC power supplies.

Table 23: DC Power Supply LEDs on a QFX5120-48Y Switch

OffUnlitIn

OffUnlitOut

On steadilyGreen

DescriptionStateColorName

The power supply is disconnected from power, or power is not coming into the power supply.

Power is coming into the power supply.On steadilyGreen

The power supply is disconnected from power, or the power supply is not sending out power correctly.

The power supply is sending out power correctly.

Page 60

Table 23: DC Power Supply LEDs on a QFX5120-48Y Switch (continued)

DescriptionStateColorName

On steadilyAmberFault

Page 61

CHAPTER

Site Planning, Preparation, and

Specifications

Site Preparation Checklist for QFX5120 Switches | 65

QFX5120 Site Guidelines and Requirements | 66

QFX5120 Network Cable and Transceiver Planning | 73

QFX5120 Management Cable Specifications and Pinouts | 81

Page 62

Page 63

Site Preparation Checklist for QFX5120 Switches

The checklist in Table 24 on page 65 summarizes the tasks you need to perform to prepare a site for installing a QFX5120 switch.

Table 24: Site Preparation Checklist

DatePerformed byFor More InformationItem or Task

Environment

Verify that environmental factors such as temperature and humidity do not exceed switch tolerances.

Power

Measure the distance between external power sources and the switch installation site.

Locate sites to connect system grounding.

Calculate the power consumption and requirements.

Hardware Configuration

“Environmental Requirements and Specifications for QFX5120 Switches” on page 66

“Clearance Requirements for Airflow and Hardware Maintenance for QFX5120 Switches” on page 71

AC Power Supply

•

Specifications for QFX5120 Switches on page 52

QFX5120 DC Power

•

Specifications on page 60

Choose the number and types of switches you want to install.

Rack or Cabinet

Verify that the rack meets the minimum requirements for installing the switch.

Plan rack or cabinet location, including required space clearances.

Secure the rack or cabinet to the floor and building structure.

“QFX5120 Switches Hardware Overview” on page 21

Rack Requirements for

•

QFX5120 Switches on page 69

Page 64

Table 24: Site Preparation Checklist (continued)

Cables

Acquire cables and connectors:

Determine the number of cables needed

•

based on your planned configuration.

Review the maximum distance allowed

•

for each cable. Choose the length of the cable based on the distance between the hardware components being connected.

Plan the cable routing and management.

DatePerformed byFor More InformationItem or Task

QFX5120 Site Guidelines and Requirements

IN THIS SECTION

Environmental Requirements and Specifications for QFX5120 Switches | 66

General Site Guidelines | 68

Site Electrical Wiring Guidelines | 68

Rack Requirements for QFX5120 Switches | 69

Cabinet Requirements for QFX5120 Switches | 70

Clearance Requirements for Airflow and Hardware Maintenance for QFX5120 Switches | 71

Environmental Requirements and Specifications for QFX5120 Switches

The switch must be installed in a rack or cabinet. It must be housed in a dry, clean, well-ventilated, and temperature-controlled environment.

Page 65

Follow these environmental guidelines:

The site must be as dust-free as possible, because dust can clog air intake vents and filters, reducing the

•

efficiency of the switch cooling system.

Maintain ambient airflow for normal switch operation. If the airflow is blocked or restricted, or if the

•

intake air is too warm, the switch might overheat, leading to the switch temperature monitor shutting down the device to protect the hardware components.

Table 25 on page 67 provides the required environmental conditions for normal switch operation for

QFX5120.

Table 25: QFX5120 Environmental Tolerances

Switch or Device

SeismicTemperatureRelative HumidityAltitude

QFX5120-48Y

QFX5120-32C

No performance degradation to 6000 feet (1829 meters)

No performance degradation to 16404 feet (5000 meters)

Normal operation ensured in relative humidity range of 5% through 90%, noncondensing

Normal operation

•

ensured in temperature range of 32° F through 104° F (0° C through 40° C).

Non-operating

•

storage temperature in shipping container: –40° F through 158° F (–40° C through 70° C)

Normal operation

•

ensured in temperature range of 32° F through 104° F (0° C through 40° C)

Nonoperating

•

storage temperature in shipping container: –40° F through 158° F (–40° C through 70° C)

Designed to comply with Zone 4 earthquake requirements per NEBS GR-63-CORE, Issue 3.

NOTE: Install the QFX5120 only in restricted areas, such as dedicated equipment rooms and

equipment closets, in accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical Code, ANSI/NFPA 70.

Page 66

General Site Guidelines

Efficient device operation requires proper site planning and maintenance and proper layout of the equipment, rack or cabinet (if used), and wiring closet.

To plan and create an acceptable operating environment for your device and prevent environmentally caused equipment failures:

Keep the area around the chassis free from dust and conductive material, such as metal flakes.

•

Follow prescribed airflow guidelines to ensure that the cooling system functions properly and that

•

exhaust from other equipment does not blow into the intake vents of the device.

Follow the prescribed electrostatic discharge (ESD) prevention procedures to prevent damaging the

•

equipment. Static discharge can cause components to fail completely or intermittently over time.

Install the device in a secure area, so that only authorized personnel can access the device.

•

Site Electrical Wiring Guidelines

Table 26 on page 68 describes the factors you must consider while planning the electrical wiring at your

site.

WARNING: You must provide a properly grounded and shielded environment and use

electrical surge-suppression devices.

Table 26: Site Electrical Wiring Guidelines

GuidelinesSite Wiring Factor

Signaling limitations

If your site experiences any of the following problems, consult experts in electrical surge suppression and shielding:

Improperly installed wires cause radio frequency interference (RFI).

•

Damage from lightning strikes occurs when wires exceed recommended distances or

•

pass between buildings.

Electromagnetic pulses (EMPs) caused by lightning damage unshielded conductors and

•

electronic devices.

Page 67

Table 26: Site Electrical Wiring Guidelines (continued)

GuidelinesSite Wiring Factor

Radio frequency interference

Electromagnetic compatibility

To reduce or eliminate RFI from your site wiring, do the following:

Use a twisted-pair cable with a good distribution of grounding conductors.

•

If you must exceed the recommended distances, use a high-quality twisted-pair cable

•

with one ground conductor for each data signal when applicable.

If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from lightning or radio transmitters, seek expert advice.

Some of the problems caused by strong sources of electromagnetic interference (EMI) are:

Destruction of the signal drivers and receivers in the device

•

Electrical hazards as a result of power surges conducted over the lines into the equipment

•

Rack Requirements for QFX5120 Switches

QFX5120 switches are designed to be installed on four-post racks.

Rack requirements consist of:

Rack type

•

Mounting bracket hole spacing

•

Rack size and strength

•

Table 27 on page 69 provides the rack requirements and specifications for the QFX5120.

Table 27: Rack Requirements for the QFX5120 Switch

GuidelinesRack Requirement

Rack type

Use a four-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75 in. or 4.45 cm) increments and that meets the size and strength requirements to support the weight.

A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310–D) published by the Electronics Industry Association.

Page 68

Table 27: Rack Requirements for the QFX5120 Switch (continued)

GuidelinesRack Requirement

Mounting bracket hole spacing

Rack size and strength

The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so that the switch can be mounted in any rack that provides holes spaced at that distance.

Ensure that the rack is a 19-in. rack as defined in Cabinets, Racks, Panels,

•

and Associated Equipment (document number EIA-310–D) published by the Electronics Components Industry Association (http://www.ecianow.org/).

Ensure that the rack is one of the following standard depth:

•

23.6 in. (600 mm)

•

30.0 in. (762 mm)

•

31.5 in. (800 mm)

•

Ensure that the rack rails are spaced widely enough to accommodate the

•

external dimensions of the switch chassis. The outer edges of the front-mounting brackets extend the width to 19 in. (48.26 cm).

Either side of the switch needs to be mounted flush with the rack and still

•

adjustable for racks with different depths. The front and rear rack rails must be spaced between 23.62 in. (600 mm) and 31.5 in. (800 mm) front to back.

The rack must be strong enough to support the weight of the switch.

•

Ensure that the spacing of rails and adjacent racks allows for proper

•

clearance around the switch and rack.

Rack connection to building structure

Secure the rack to the building structure.

•

If earthquakes are a possibility in your geographical area, secure the rack

•

to the floor.

Secure the rack to the ceiling brackets as well as wall or floor brackets for

•

maximum stability.

Cabinet Requirements for QFX5120 Switches

You can mount the QFX5120 switch in a cabinet that contains a four-post 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronics Industry

Association.

Cabinet requirements consist of:

Cabinet size and clearance

•

Cabinet airflow requirements

•

Page 69

Table 28 on page 71 provides the cabinet requirements and specifications for the QFX5120 switch.

Table 28: Cabinet Requirements for the QFX5120 Switch

GuidelinesCabinet Requirement

Cabinet size and clearance

Cabinet airflow requirements

The minimum cabinet size for accommodating a QFX5120 switch is 36 in. (91.4 cm) deep. Large cabinets improve airflow and reduce the chance of overheating.

When you mount the switch in a cabinet, ensure that ventilation through the cabinet is sufficient to prevent overheating.

Ensure that the cool air supply you provide through the cabinet adequately

•

dissipates the thermal output of the switch (or switches).

Ensure that the cabinet allows the chassis hot exhaust air to exit the cabinet

•

without recirculating into the switch. An open cabinet (without a top or doors) that employs hot air exhaust extraction from the top allows the best airflow through the chassis. If the cabinet contains a top or doors, perforations in these elements assist with removing the hot air exhaust.

The QFX5120 fans exhaust hot air either through the vents on the port

•

panel or through the fans and power supplies. Install the switch in the cabinet in a way that maximizes the open space on the FRU side of the chassis. This maximizes the clearance for critical airflow.

Route and dress all cables to minimize the blockage of airflow to and from

•

the chassis.

Ensure that the spacing of rails and adjacent cabinets allows for the proper

•

clearance around the switch and cabinet.

Clearance Requirements for Airflow and Hardware Maintenance for QFX5120 Switches

When planning the site for installing a QFX5120 switch, you must ensure sufficient clearance around the switch. See Figure 35 on page 72

Follow these clearance requirements:

For the cooling system to function properly, the airflow around the chassis must be unrestricted.

•

If you are mounting the switch on a rack or cabinet along with other equipment, ensure that the exhaust

•

from other equipment does not blow into the intake vents of the chassis.

Leave at least 6 in. (15.2 cm) clearance in front of and behind the chassis for airflow.

•

Page 70

Leave at least 6 in. (15.2 cm) clearance on the left of the chassis for installing the grounding lug.

•

Leave at least 24 in. (61 cm) clearance in front of and behind the switch for service personnel to remove

•

and install hardware components.

Figure 35: QFX5120-48Y Switch - Clearance Requirements for Airflow and Hardware Maintenance

If you’re installing a QFX5120-32C Switch, note that the dimensions for the grounding lug are different (see Figure 36 on page 73. The dimensions are as follows:

Grounding wire- 14 AWG

•

Lug- 4.3 mm Circular Lug

•

Screw- 8mm screw used for tightening the Lug

•

Page 71

Figure 36: QFX5120-32C Switch - Clearance Requirements for Airflow and Hardware Maintenance

g051125

Top view

20.29 in. (51.53 cm)

17.26 in. (44 cm)

17.26

(44 cm)

Ports FRUs

21.59 in. (55 cm)

24.0 in. (61 cm)

Clearance required

for maintenance

Clearance required

for maintenance

24.0 in. (61 cm)

QFX5120 Network Cable and Transceiver Planning

IN THIS SECTION

Pluggable Transceivers Supported on QFX5120 Switches | 73

SFP28 Direct Attach Copper Cables for QFX5120 Switches | 74

QSFP28 Direct Attach Copper Cables for QFX5120 Switches | 76

Cable Specifications for QSFP+ and QSFP28 Transceivers on QFX5120 Switches | 77

Calculating the Fiber-Optic Cable Power Budget for QFX Series Switches | 78

Calculating the Fiber-Optic Cable Power Margin for QFX Series Switches | 79

Pluggable Transceivers Supported on QFX5120 Switches

QFX5120 switches support SFP, SFP+, SFP28, QSFP+, and QSFP28 transceivers. You can find the list of transceivers supported on QFX5120 switches and information about those transceivers at the Hardware

Compatibility Tool page for QFX5120.

Page 72

NOTE: We recommend that you use only optical transceivers and optical connectors purchased

from Juniper Networks with your Juniper Networks device.

CAUTION: If you face a problem running a Juniper Networks device that uses a third-party

optic or cable, the Juniper Networks Technical Assistance Center (JTAC) can help you diagnose the source of the problem. Your JTAC engineer might recommend that you check the third-party optic or cable and potentially replace it with an equivalent Juniper Networks optic or cable that is qualified for the device.

The Gigabit Ethernet SFP, SFP+, SFP28, QSFP+, and QSFP28 transceivers installed in QFX5120 switches support digital optical monitoring (DOM): You can view the diagnostic details for these transceivers by issuing the operational mode CLI command show interfaces diagnostics.

SFP28 Direct Attach Copper Cables for QFX5120 Switches

IN THIS SECTION

Cable Specifications | 75

Standards Supported by These Cables | 75

Small form-factor pluggable transceiver (SFP28) direct attach copper (DAC) cables, also known as Twinax cables, are suitable for in-rack connections between servers and switches. They are suitable for short distances, making them ideal for highly cost-effective networking connectivity within a rack and between adjacent racks.

NOTE: We recommend that you use only SFP28 DAC cables purchased from Juniper Networks

with your Juniper Networks device.

Page 73

CAUTION: If you face a problem running a Juniper Networks device that uses a third-party

Cable Specifications

QFX5120 switches support SFP28 passive DAC cables. The passive Twinax cable is a straight cable with no active electronic components. QFX5120 switches support 1 m, 3 m, and 5 m long SFP28 passive DAC cables. See Figure 37 on page 75.

Figure 37: SFP28 Direct Attach Copper Cables for QFX5120 Switches

The cables are hot-removable and hot-insertable: You can remove and replace them without powering off the switch or disrupting switch functions. A cable comprises a low-voltage cable assembly that connects directly into two 25-Gigabit Ethernet ports, one at each end of the cable. The cables use high-performance integrated duplex serial data links for bidirectional communication and are designed for data rates of up to 25 Gbps.

Standards Supported by These Cables

The cables comply with the following standards:

SFP mechanical standard SFF-8431— see ftp://ftp.seagate.com/sff/SFF-8431.PDF.

•

Electrical interface standard SFF-8432— see ftp://ftp.seagate.com/sff/SFF-8432.PDF.

•

SFP+ Multi-Source Alliance (MSA) standards

•

Page 74

QSFP28 Direct Attach Copper Cables for QFX5120 Switches

IN THIS SECTION

Cable Specifications | 76

Section | ?

Quad small form-factor pluggable (QSFP28) direct attach copper (DAC) cables are suitable for in-rack connections between QSFP28 ports on QFX5120 switches. They are suitable for short distances, making them ideal for highly cost-effective networking connectivity within a rack and between adjacent racks.

NOTE: We recommend that you use only QSFP28 DAC cables purchased from Juniper Networks

with your Juniper Networks device.

CAUTION: If you face a problem running a Juniper Networks device that uses a third-party

Cable Specifications

QSFP28 passive DAC cables are hot-removable and hot-insertable. A cable consists of a cable assembly that connects directly into two QSFP28 modules, one at each end of the cable. The cables use integrated duplex serial data links for bidirectional communication and are designed for data rates up to 100 Gbps. Passive DAC cables have no signal amplification built into the cable assembly. See Figure 38 on page 76.

Figure 38: QSFP28 Direct Attach Copper Cables

Page 75

Cable Specifications for QSFP+ and QSFP28 Transceivers on QFX5120 Switches

The 40-Gigabit Ethernet QSFP+ and 100-Gigabit Ethernet QSFP28 transceivers that are used in QFX5120 switches use 12-ribbon multimode fiber crossover cables with female MPO/UP, MPO/UPC, or MPO/APC connectors. The fiber can be either OM3 or OM4. These cables are not sold by Juniper Networks.

CAUTION: To maintain agency approvals, use only a properly constructed, shielded

cable.

TIP: Ensure that you order cables with the correct polarity. Vendors refer to these crossover cables

as key up to key up, latch up to latch up, Type B, or Method B. If you are using patch panels between two QSFP+ ports, ensure that the proper polarity is maintained through the cable plant.

Table 29 on page 77 describes the signals on each fiber.

Table 29: QSFP+ and QSFP28 MPO Cable Signals

SignalFiber

Tx0 (Transmit)1

Tx1 (Transmit)2

Tx2 (Transmit)3

Tx3 (Transmit)4

Unused5

Unused6

Unused7

Unused8

Rx3 (Receive)9

Rx2 (Receive)10

Page 76

Table 29: QSFP+ and QSFP28 MPO Cable Signals (continued)

SignalFiber

Rx1 (Receive)11

Rx0 (Receive)12

Table 30 on page 78 shows the pin-to-pin connections for proper polarity

Table 30: QSFP+ and QSFP28 MPO Fiber-Optic Crossover Cable Pinouts

PinPin

121

112

103

310

211

112

Calculating the Fiber-Optic Cable Power Budget for QFX Series Switches

Calculate the fiber-optic data link's power budget when planning fiber-optic cable layout and distances to ensure that fiber-optic connections have sufficient power for correct operation. The power budget is the maximum amount of power the link can transmit. When you calculate the power budget, you use a

Page 77

worst-case analysis to provide a margin of error, even though all the parts of an actual system do not operate at the worst-case levels.

To calculate the worst-case estimate for the fiber-optic cable power budget (PB) for the link:

1. Determine values for the link's minimum transmitter power (PT) and minimum receiver sensitivity (PR). For example, here, (PT) and (PR) are measured in decibels, and decibels are referenced to 1 milliwatt (dBm):

PT= –15 dBm

PR= –28 dBm

NOTE: See the specifications for your transmitter and receiver to find the minimum transmitter

power and minimum receiver sensitivity.

2. Calculate the power budget (PB) by subtracting (PR) from (PT):

–15 dBm – (–28 dBm) = 13 dBm

Calculating the Fiber-Optic Cable Power Margin for QFX Series Switches

Calculate the fiber-optic data link's power margin when planning fiber-optic cable layout and distances to ensure that fiber-optic connections have sufficient signal power to overcome system losses and still satisfy the minimum input requirements of the receiver for the required performance level. The power margin (PM) is the amount of power available after attenuation or link loss (LL) has been subtracted from the

power budget (PB).

When you calculate the power margin, you use a worst-case analysis to provide a margin of error, even though all the parts of an actual system do not operate at worst-case levels. A power margin (PM) greater

than zero indicates that the power budget is sufficient to operate the receiver and that it does not exceed the maximum receiver input power. This means the link will work. A power margin (PM) that is zero or

negative indicates insufficient power to operate the receiver. See the specification for your receiver to find the maximum receiver input power.

Before you begin to calculate the power margin, calculate the power budget. See “Calculating the Fiber-Optic

Cable Power Budget for QFX Series Switches” on page 78.

Page 78

To calculate the worst-case estimate for the power margin (PM) for the link:

1. Determine the maximum value for link loss (LL) by adding estimated values for applicable link-loss factors; for example, use the sample values for various factors as provided in Table 31 on page 80 (here, the link is 2 km long and multimode, and the power margin (PM) is 13 dBm).

Table 31: Estimated Values for Factors Causing Link Loss

Sample Link Loss Calculation ValuesEstimated Link Loss ValueLink-Loss Factor

0.5 dBmMultimode—0.5 dBmHigher-order mode

losses

0 dBmSingle-mode—None

Modal and chromatic dispersion

(CRM)

bandwidth and distance is less than 500 MHz/km

0.5 dBmConnector

0.5 dBmSplice

Multimode—1 dBm/kmFiber attenuation

Single-mode—0.5 dBm/km

0 dBmMultimode—None, if the sum of

0 dBmSingle-mode—None

This example assumes five connectors. Loss for five connectors: (5)x(0.5 dBm) = 2.5 dBm.

This example assumes two splices. Loss for two splices: 2 (0.5 dBm) = 1 dBm.

This example assumes the link is 2 km long. Fiber attenuation for 2 km: 2 km (1 dBm/km) = 2 dBm.

This example assumes the link is 2 km long. Fiber attenuation for 2 km: 2 km (0.5 dBm/km) = 1 dBm.

1 dBm1 dBmClockRecovery Module

NOTE: For information about the actual amount of signal loss caused by equipment and other

factors, see your vendor documentation for that equipment.

2. Calculate the (PM) by subtracting (LL) from (PB):

PB– LL = P

13 dBm – 0.5 dBm [HOL] – 5 x (0.5 dBm) – 2 (0.5 dBm) – 2 km (1.0 dBm/km) – 1 dB [CRM] = P

Page 79

13 dBm – 0.5 dBm – 2.5 dBm – 1 dBm – 2 dBm – 1 dBm = P

PM= 6 dBm

The calculated power margin is greater than zero, indicating that the link has sufficient power for transmission. Also, the power margin value does not exceed the maximum receiver input power.

Refer to the specifications for your receiver to find the maximum receiver input power.

QFX5120 Management Cable Specifications and Pinouts

IN THIS SECTION

Console Port Connector Pinout Information | 81

RJ-45 Management Port Connector Pinout Information | 82

RJ-45 to DB-9 Serial Port Adapter Pinout Information | 83

QSFP+,QSFP28, SFP, SFP+, and SFP28 Port Connector Pinout Information | 83

Console Port Connector Pinout Information

The console port on a Juniper Networks device is an RS-232 serial interface that uses an RJ-45 connector to connect to a console management device. The default baud rate for the console port is 9600 baud.

Table 32 on page 82 provides the pinout information for the RJ-45 console connector.

NOTE: If your laptop or PC does not have a DB-9 male connector pin and you want to connect

your laptop or PC directly to a device, use a combination of the RJ-45 to DB-9 female adapter and a USB to DB-9 male adapter. You must provide the USB to DB-9 male adapter.

Page 80

Table 32: Console Port Connector Pinout Information

DescriptionSignalPin

No ConnectionNC1

No ConnectionNC2

Transmit dataTxD Output3

Signal groundSignal Ground4

Signal groundSignal Ground5

Receive dataRxD Input6

No ConnectionNC7

No ConnectionNC8

RJ-45 Management Port Connector Pinout Information

Table 33 on page 82 provides the pinout information for the RJ-45 connector for the management port

on Juniper Networks devices.

Table 33: RJ-45 Management Port Connector Pinout Information

DescriptionSignalPin

Transmit/receive data pair 1TRP1+1

Transmit/receive data pair 1TRP1—2

Transmit/receive data pair 2TRP2+3

Transmit/receive data pair 3TRP3+4

Transmit/receive data pair 3TRP3—5

Transmit/receive data pair 2TRP2—6

Transmit/receive data pair 4TRP4+7

Page 81

Table 33: RJ-45 Management Port Connector Pinout Information (continued)

DescriptionSignalPin

Transmit/receive data pair 4TRP4—8

RJ-45 to DB-9 Serial Port Adapter Pinout Information

The console port is an RS-232 serial interface that uses an RJ-45 connector to connect to a management device such as a PC or a laptop. If your laptop or PC does not have a DB-9 male connector pin and you want to connect your laptop or PC to the device, use a combination of the RJ-45 to DB-9 female adapter along with a USB to DB-9 male adapter.

Table 34 on page 83 provides the pinout information for the RJ-45 to DB-9 serial port adapter.

Table 34: RJ-45 to DB-9 Serial Port Adapter Pinout Information

SignalDB-9 PinSignalRJ-45 Pin

CTS8RTS1

DSR6DTR2

RXD2TXD3

GND5GND4

TXD3RXD6

DTR4DSR7

RTS7CTS8

QSFP+,QSFP28, SFP, SFP+, and SFP28 Port Connector Pinout Information

The tables in this topic provide the connector pinout information for the SFP, SFP+, SFP28, QSFP+, and QSFP28 ports.

Table 35 on page 84—SFP network port connector pinout information

•

Table 37 on page 86—QSFP+ and QSFP28 network module port connector pinout information

•

Page 82

Table 35: SFP Network Port Connector Pinout Information

DescriptionSignalPin

Module transmitter groundVeeT1

Module transmitter faultTX_Fault2

Transmitter disabledTX_Disable3

2-wire serial interface data lineSDA4

2-wire serial interface clockSCL-5

Module absentMOD_ABS6

Rate selectRS7

Receiver loss of signal indicationRX_LOS8

Module receiver groundVeeR9

Module receiver groundVeeR10

Module receiver groundVeeR11

Receiver inverted data outputRD-12

Receiver noninverted data outputRD+13

Module receiver groundVeeR14

Module receiver 3.3 V supplyVccR15

Module transmitter 3.3 V supplyVccT16

Module transmitter groundVeeT17

Transmitter noninverted data inputTD+18

Transmitter inverted data inputTD-19

Module transmitter groundVeeT20

Table 36 on page 85—SFP+ and SFP28 network port connector pinout information

Page 83

Table 36: SFP+ and SFP28 Network Port Connector Pinout Information

DescriptionSignalPin

Module transmitter groundVeeT1

Module transmitter faultTX_Fault2

Transmitter disabledTX_Disable3

2-wire serial interface data lineSDA4

2-wire serial interface clockSCL-5

Module absentMOD_ABS6

Rate select 0, optionally controls SFP+ module receiverRS07

Receiver loss of signal indicationRX_LOS8

Rate select 1, optionally controls SFP+ transmitterRS19

Module receiver groundVeeR10

Module receiver groundVeeR11

Receiver inverted data outputRD-12

Receiver noninverted data outputRD+13

Module receiver groundVeeR14

Module receiver 3.3 V supplyVccR15

Module transmitter 3.3 V supplyVccT16

Module transmitter groundVeeT17

Transmitter noninverted data inputTD+18

Transmitter inverted data inputTD-19

Module transmitter groundVeeT20

Table 37 on page 86—QSFP+ and QSFP28 network module port connector pinout information

Page 84

Table 37: QSFP+ and QSFP28 Network Port Connector Pinout Information

SignalPin

GND1

TX2n2

TX2p3

GND4

TX4n5

TX4p6

GND7

ModSelL8

LPMode_Reset9

VccRx10

SCL11

SDA12

GND13

RX3p14

RX3n15

GND16

RX1p17

RX1n18

GND19

GND20

RX2n21

Page 85

Table 37: QSFP+ and QSFP28 Network Port Connector Pinout Information (continued)

SignalPin

RX2p22

GND23

RX4n24

RX4p25

GND26

ModPrsL27

IntL28

VccTx29

Vcc130

Reserved31

GND32

TX3p33

TX3n34

GND35

TX1p36

TX1n37

GND38

Page 86

CHAPTER

Initial Installation and Configuration

Unpacking and Mounting the QFX5120 Switch | 91

Connecting the QFX5120 to Power | 98

Connecting the QFX5120 to the Network | 106

Connecting the QFX5120 to External Devices | 110

Configuring Junos OS on the QFX5120 | 112

Page 87

Page 88

Unpacking and Mounting the QFX5120 Switch

IN THIS SECTION

Unpacking the Switch | 91

Parts Inventory (Packing List) for a QFX5120 Switch | 92

Registering Products—Mandatory for Validating SLAs | 93

Mounting a QFX5120 Switch on Four Posts of a Rack or Cabinet | 93

Unpacking the Switch

QFX5120 switches are shipped in a cardboard carton, secured with foam packing material. The carton has an accessory compartment and contains the quick start instructions.

CAUTION: QFX5120 switches are maximally protected inside the shipping carton. Do

not unpack the switches until you are ready to begin installation.

To unpack the switch:

1. Move the shipping carton to a staging area as close to the installation site as possible, but where you have enough room to remove the system components.

2. Position the carton so that the arrows marked on the carton are pointing up.

3. Open the top flaps on the shipping carton.

4. Pull out the packing material holding the switch in place.

5. Verify the parts received against the inventory on the label attached to the carton.

6. Save the shipping carton and packing materials in case you need to move or ship the switch later.

Page 89

Parts Inventory (Packing List) for a QFX5120 Switch

The switch shipment includes a packing list. Check the parts you receive with the switch against the items in the packing list. The packing list specifies the part number and provides a description of each part in your order. The parts shipped depend on the switch model you order.

If any part in the packing list is missing, contact your customer service representative or contact Juniper customer care from within the U.S. or Canada by telephone at 1-888-314-5822. For international-dial or direct-dial options in countries without toll-free numbers, see

https://www.juniper.net/support/requesting-support.html .

Table 38 on page 92 lists the parts and their quantities as in the standard packing list for a QFX5120

switch.

Table 38: Inventory of Components Provided with an QFX5120 Switch

Component

Fan modules

appropriate for your geographical location

Mounting brackets

QFX5120-48Y

QFX5120-32C

Quantity

1Switch

5 preinstalled

6 preinstalled

2 (AC or DC) preinstalledQFX5120Power supplies

2QFX5120ACpower cord

Rear mounting blades - 2

•

Front mounting brackets - 2

•

Extension brackets -2

•

Mounting screws -12

•

1RJ-45 cable and RJ-45 to DB-9 serial port adapter

1Quick Start installation instructions

1Juniper Networks Product Warranty

1End User License Agreement

Page 90

NOTE: You must provide the appropriate mounting screws for mounting the switch on a rack or

a cabinet.

Registering Products—Mandatory for Validating SLAs

Register all new Juniper Networks hardware products and changes to an existing installed product using the Juniper Networks website to activate your hardware replacement service-level agreements (SLAs).

CAUTION: Register product serial numbers on the Juniper Networks website and update

the installation base data if there is any addition or change to the installation base or if the installation base is moved. Juniper Networks will not be held accountable for not meeting the hardware replacement service-level agreement for products that do not have registered serial numbers or accurate installation base data.

https://www.juniper.net/customers/csc/management/updateinstallbase.jsp.

Mounting a QFX5120 Switch on Four Posts of a Rack or Cabinet

The four-post rack-mounting kit ships with the short front mounting brackets attached to the side mounting rails. If you want to recess the switch in the rack, you must unscrew the short front mounting brackets from the side mounting rails by using the Phillips (+) screwdriver, and then attach the long front mounting brackets to the side mounting rails.

You can mount a QFX5120 switch on four posts of a 19-in. rack or a 19-in. cabinet by using a four-post rack-mounting kit, which you must order separately. (The remainder of this topic uses rack to mean rack or cabinet.)

Page 91

NOTE:

To ensure that the protective earthing terminal is accessible through the opening in the rear mounting bracket:

Ensure that the rack is 27.5-in. (70-cm) through 30.5-in. (77.5-cm) deep if you are mounting the

•

switch flush with the rack front on four posts of a rack.

Ensure that the rack is 29.5-in. (75-cm) through 32.5-in. (82.5-cm) deep if you are mounting the

•

switch 2 in. recessed from the rack front on four posts of a rack.

Before mounting a QFX5120 switch on four posts of a rack:

Place the rack in its permanent location, allowing adequate clearance for airflow and maintenance, and

•

secure the rack to the building structure.

Read “General Safety Guidelines and Warnings” on page 161, with particular attention to “Chassis and

•

Component Lifting Guidelines” on page 167.

Remove the switch from the shipping carton.

•

Before you begin mounting a QFX5120 switch, ensure that you have the following parts and tools available:

Phillips (+) screwdriver, number 2 (not provided)

•

Screws to secure the chassis and the rear mounting brackets to the rack (not provided)

•

6 flat-head 4-40 Phillips mounting screws (provided with the four-post rack-mounting kit)

•

12 flat-head 4x6-mm Phillips mounting screws (provided with the four-post rack-mounting kit)

•

One pair each of front mounting brackets for flush installation and front mounting brackets for 2-in.

•

recessed installation

One pair of side mounting rails (provided with the four-post rack-mounting kit)

•

One pair of rear mounting brackets (provided with the four-post rack-mounting kit)

•

NOTE: One person must be available to lift the switch while another person secures the switch to

the rack.

CAUTION: If you are mounting multiple units on a rack, mount the heaviest unit at the

bottom of the rack, and then mount the other units from the bottom of the rack to the top in decreasing order of the weight of the units.

Page 92

To mount a QFX5120 switch on four posts of a rack:

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1. Place the switch on a flat, stable surface.

2. Align the side mounting rails along the side panels of the switch chassis. Align the two holes in the rear of the side mounting rails with the two holes on the rear of the side panels.

3. For QX5120-48Y, insert 4x6-mm Phillips flat-head mounting screws into the two aligned holes, and tighten the screws by using the Philips number 2 screwdriver. For QFX5120-32C, ensure that the remaining four holes in the side mounting rails are aligned with the four holes in the side panel.

4. Insert 4x6-mm Phillips flat-head mounting screws into the remaining four holes in the side mounting rails, and tighten the screws by using the Phillips number 2 screwdriver. See Figure 39 on page 95,

Figure 40 on page 95, andFigure 41 on page 96.

Figure 39: Aligning the Holes of the Mounting Rail and Attaching with Screws to a QFX5120-32C Switch Chassis

Figure 40: Attaching the Side Mounting Rail to a QFX5120-48Y Switch Chassis

Page 93

Figure 41: Attaching the Side Mounting Rail to a QFX5120-32C Switch Chassis

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g051134

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5. One person should grasp both sides of the switch, lift the switch, and position it in the rack, aligning the holes of the side mounting rails with the threaded holes in the front post of the rack. Align the bottom hole in both the front mounting brackets with a hole in each rack rail, making sure that the chassis is level.

6. Have a second person secure the front of the switch to the rack by using the appropriate screws for your rack. Tighten the screws. See Figure 42 on page 96 and Figure 43 on page 96

Figure 42: Mounting a QFX5120-48Y Switch on Front Posts of a Rack

Figure 43: Mounting a QFX5120-32C Switch on Front Posts of a Rack

7. Slide the rear mounting brackets into the side mounting rails.

Page 94

8. Attach the rear mounting brackets to the rear post by using the appropriate screws for your rack.

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Tighten the screws. See Figure 44 on page 97 and Figure 45 on page 97

Figure 44: Connecting Rear Mounting Brackets to a QFX5120-48Y Switch

Figure 45: Connecting Rear Mounting Brackets to a QFX5120-32C Switch

9. Ensure that the switch chassis is level by verifying that all the screws on the front of the rack are aligned with the screws at the back of the rack.

NOTE: We recommend that you install cover panels in all unused power supply slots.

Page 95

Connecting the QFX5120 to Power

IN THIS SECTION

Connecting Earth Ground to a QFX5120 Switch | 98

Connecting AC Power to a QFX5120 Switch | 99

Connecting DC Power to a QFX5120 Switch | 101

Connecting Earth Ground to a QFX5120 Switch

To connect earth ground to a switch:

1. Connect one end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.

2. Place the grounding lug attached to the grounding cable over the protective earthing terminal. See

Figure 46 on page 98 and Figure 47 on page 99.

Figure 46: Connecting a Grounding Cable to a QFX5120-48Y Switch

Page 96

Figure 47: Connecting a Grounding Cable to a QFX5120-32C Switch

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3. Secure the grounding lug to the protective earthing terminal with the washers and screws.

4. Dress the grounding cable and ensure that it does not touch or block access to other switch components.

WARNING: Ensure that the cable does not drape where people could trip over it.

Connecting AC Power to a QFX5120 Switch

The QFX5120 is shipped with two 650 W power supplies pre-installed. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running. You can install replacement power supplies in the two slots next to the fan modules without powering off the switch or disrupting switch functions.

Ensure that you have a power cord appropriate for your geographical location available to connect AC power to the switch.

Before you begin connecting AC power to the switch:

Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage

•

(see “Prevention of Electrostatic Discharge Damage” on page 191).

Ensure that you have connected the switch chassis to earth ground.

•

Page 97

CAUTION: Before you connect power to the switch, a licensed electrician must attach

a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit).

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to the earth ground. The switch gains additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using the AC power cord appropriate for your geographical location.

To connect AC power to a QFX5120:

1. Attach the grounding strap to your bare wrist and to a site ESD point.

100

2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure. If only one power supply is installed, ensure that a blank cover panel is installed over the second power supply slot.

3. Locate the power cord or cords shipped with the switch; the cords have plugs appropriate for your geographical location.

WARNING: Ensure that the power cord does not block access to device components

or drape where people can trip on it.

4. Connect each power supply to the power sources. Insert the coupler end of the power cord into the AC power cord inlet on the AC power supply faceplate.

5. Push the power cord retainer onto the power cord (see Figure 48 on page 101 and Figure 49 on page 101).

Page 98

Figure 48: Connecting Power to an AC-Powered QFX5120-48Y Switch

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Figure 49: Connecting Power to an AC-Powered QFX5120-32C Switch

101

6. The switch powers on as soon as power is provided to the power supply. There is no power switch on the device.

7. Insert the power cord plug into an AC power source outlet.

8. Verify that the AC and DC LEDs on each power supply are lit green.

If the amber fault LED is lit, remove power from the power supply, and replace the power supply. Do not remove the power supply until you have a replacement power supply ready: the power supplies or a blank cover panel must be installed in the switch to ensure proper airflow.

CAUTION: Replace a failed power supply with a blank panel or new power supply

within one minute of removal to prevent chassis overheating.

Connecting DC Power to a QFX5120 Switch

The QFX5120 is shipped from the factory with two 650 W power supplies. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed

Page 99

and running. You can install replacement power supplies in the two slots next to the fan modules without powering off the switch or disrupting the switching function.

WARNING: A DC-powered QFX5120-48Y is intended for installation only in a restricted

access location.

NOTE: The battery returns of the DC power supply must be connected as an isolated DC return

(DC-I).

Before you begin connecting DC power to the switch:

Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage

•

(see “Prevention of Electrostatic Discharge Damage” on page 191).

Ensure that you have connected the switch chassis to earth ground.

•

102

CAUTION: Before you connect power to the switch, a licensed electrician must attach

a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit).

Install the power supply in the chassis.

•

Ensure that you have the following parts and tools available:

DC power source cables (14–16 AWG) with ring lug (Molex 190700069 or equivalent) (not provided)

•

Phillips (+) screwdriver, number 2 (not provided)

•

Multimeter (not provided)

•

To connect DC power to a QFX5120-48Y Switch:

1. Attach the grounding strap to your bare wrist and to a site ESD point.

2. Verify that the DC power cables are correctly labeled before making connections to the power supply. In a typical power distribution scheme where the return is connected to chassis ground at the battery

Page 100

plant, you can use a multimeter to verify the resistance of the –48V and RTN DC cables to chassis ground:

The cable with very low resistance (indicating a closed circuit) to chassis ground is positive (+) and

•

will be installed on the V+ (return) DC power input terminal.

The cable with very high resistance (indicating an open circuit) to chassis ground is negative (–) and

•

will be installed on the V– (input) DC power input terminal.

CAUTION: You must ensure that power connections maintain the proper polarity.

The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the DC power input terminals on each power supply.

3. Ensure that the input circuit breaker is open so that the voltage across the DC power source cable leads is 0 V and that the cable leads do not become active while you are connecting DC power.

103

NOTE: The V+ terminals are referred to as +RTN, and V– terminals are referred to as –48 V in

“DC Power Wiring Sequence Warning” on page 200 and “DC Power Electrical Safety Guidelines” on page 195.

4. Ensure that the power supplies are fully inserted in the chassis.

5. Remove the terminal block cover. The terminal block cover is a piece of clear plastic that snaps into place over the terminal block.

6. Remove the screws on the terminals using the screwdriver. Save the screws.

WARNING: Ensure that the power cables do not block access to device components

or drape where people can trip on them.

7. Connect each power supply to the power sources. Secure power source cables to the power supplies by screwing the ring lugs attached to the cables to the appropriate terminals by using the screw from the terminals.

The QFX5120 is designed to operate with a DC power supply that has a single, non-redundant, feed input. For source redundancy, two DC power supplies must be installed in the QFX5120; connect

Juniper QFX5120 Series, QFX5120-32C-AFI, QFX5120-48Y-AFO2, QFX5120-48Y-AFI2, QFX5120-48Y-DC-AFO2 Hardware Manual

Table of Contents

About the Documentation

Documentation and Release Notes

Using the Examples in This Manual

Merging a Full Example

Merging a Snippet

Documentation Conventions

Documentation Feedback

Requesting Technical Support

Self-Help Online Tools and Resources

Creating a Service Request with JTAC

Overview

QFX5120 System Overview

QFX5120 Switches Hardware Overview

Benefits of the QFX5120 Switch

QFX5120 Hardware

System Software

QFX5120 Power System

QFX5120 Switch Models

Identifying QFX5120 Switch Models

Chassis Physical Specifications for QFX5120 Switches

Field-Replaceable Units in QFX5120 Switches

QFX5120 Chassis

QFX5120 Cooling System

QFX5120 Models with Front-to-Back Airflow

QFX5120 Models with Back-to-Front Airflow

Positioning the Switch

QFX5120 Fan Module Status

Management Port LEDs on QFX5120 Switches

Network Port LEDs on QFX5120 Switches

QFX5120 Cooling System

QFX5120 Cooling System

QFX5120 Models and Airflow Direction

QFX5120 Models with Front-to-Back Airflow

QFX5120 Models with Back-to-Front Airflow

Positioning the Switch

QFX5120 Fan Module Status

QFX5120 Power System

AC Power Supply in QFX5120 Switches

AC Power Supply Specifications for QFX5120 Switches

AC Power Supply Airflow

AC Power Supply Specifications for QFX5120 Switches

AC Power Cord Specifications for QFX5120 Switches

AC Power Supply LEDs in QFX5120 Switches

DC Power Supply in QFX5120 Switches

Characteristics of a DC Power Supply

DC Power Supply Airflow

QFX5120 DC Power Specifications

DC Power Supply LEDs in QFX5120 Switches

Site Preparation Checklist for QFX5120 Switches

QFX5120 Site Guidelines and Requirements

Environmental Requirements and Specifications for QFX5120 Switches

General Site Guidelines

Site Electrical Wiring Guidelines

Rack Requirements for QFX5120 Switches

Cabinet Requirements for QFX5120 Switches

Clearance Requirements for Airflow and Hardware Maintenance for QFX5120 Switches

QFX5120 Network Cable and Transceiver Planning

Pluggable Transceivers Supported on QFX5120 Switches

SFP28 Direct Attach Copper Cables for QFX5120 Switches

Cable Specifications

Standards Supported by These Cables

QSFP28 Direct Attach Copper Cables for QFX5120 Switches

Cable Specifications

Cable Specifications for QSFP+ and QSFP28 Transceivers on QFX5120 Switches

Calculating the Fiber-Optic Cable Power Budget for QFX Series Switches

Calculating the Fiber-Optic Cable Power Margin for QFX Series Switches

QFX5120 Management Cable Specifications and Pinouts

Console Port Connector Pinout Information

RJ-45 Management Port Connector Pinout Information

RJ-45 to DB-9 Serial Port Adapter Pinout Information

QSFP+,QSFP28, SFP, SFP+, and SFP28 Port Connector Pinout Information

Initial Installation and Configuration

Unpacking and Mounting the QFX5120 Switch

Unpacking the Switch

Parts Inventory (Packing List) for a QFX5120 Switch

Registering Products—Mandatory for Validating SLAs

Mounting a QFX5120 Switch on Four Posts of a Rack or Cabinet

Connecting the QFX5120 to Power