Juniper EX9251 Istruzioni per l'installazione

EX9251 Switch Hardware Guide

Published

2022-11-30

Juniper Networks, Inc.

1133 Innovaon 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 respecve 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 publicaon without noce.

EX9251 Switch Hardware Guide

The informaon in this document is current as of the date on the tle page.

YEAR 2000 NOTICE

Juniper Networks hardware and soware products are Year 2000 compliant. Junos OS has no known me-related

limitaons through the year 2038. However, the NTP applicaon is known to have some diculty in the year 2036.

END USER LICENSE AGREEMENT

The Juniper Networks product that is the subject of this technical documentaon consists of (or is intended for use

with) Juniper Networks soware. Use of such soware is subject to the terms and condions of the End User License

Agreement ("EULA") posted at hps://support.juniper.net/support/eula/. By downloading, installing or using such

soware, you agree to the terms and condions of that EULA.

Table of Contents

About This Guide | ix

Overview

EX9251 System Overview | 2

EX9251 Switch Hardware Overview | 2

EX9251 Switch Models | 7

EX9251 Switch Hardware and CLI Terminology Mapping | 7

EX9251 Chassis | 9

Chassis Physical Specicaons of an EX9251 Switch | 10

Field-Replaceable Units in an EX9251 Switch | 10

LEDs on the Front Panel of an EX9251 Switch | 12

EX9251 Cooling System | 19

EX9251 Power System | 23

Power Supplies in an EX9251 Switch | 23

AC Power Cord Specicaons for an EX9251 Switch | 28

Power Requirements for EX9251 Switch Components | 31

Power Supply Specicaons for EX9251 Switches | 32

Site Planning, Preparaon, and Specicaons

Site Preparaon Checklist for an EX9251 Switch | 36

EX9251 Site Guidelines and Requirements | 37

Environmental Requirements and Specicaons for EX Series Switches | 38

General Site Guidelines | 44

Site Electrical Wiring Guidelines | 45

Clearance Requirements for Airow and Hardware Maintenance for EX9251 Switches | 46

Rack and Cabinet Requirements for EX9251 Switches | 48

iii

EX9251 Network Cable and Transceiver Planning | 51

Pluggable Transceivers Supported on EX9251 Switches | 51

SFP+ Direct Aach Copper Cables for EX Series Switches | 52

QSFP+ Direct Aach Copper Cables for EX Series Switches | 55

Overview of EX Series Switches: Fiber-Opc Cable Signal Loss, Aenuaon, and Dispersion | 56

Calculate the Fiber-Opc Cable Power Budget for EX Series Devices | 58

Calculang the Fiber-Opc Cable Power Margin for EX Series Devices | 59

EX9251 Management Cable Specicaons and Pinouts | 61

Management Cable Specicaons | 61

Specicaons of Cables and Wires That Connect to Ports on the Front Panel in an EX9251

Switch | 62

Grounding Cable and Lug Specicaons for EX9251 Switches | 62

USB Port Specicaons for an EX Series Switch | 64

Console Port Connector Pinout Informaon for an EX9251 Switch | 64

RJ-45 to DB-9 Serial Port Adapter Pinout Informaon | 66

RJ-45 Management Port Connector Pinout Informaon | 66

Inial Installaon and Conguraon

Unpacking and Mounng the EX9251 Switch | 69

Unpacking an EX9251 Switch | 69

Parts Inventory (Packing List) for an EX9251 Switch | 70

Installing and Connecng an EX9251 Switch | 72

Mounng an EX9251 Switch on a Rack or Cabinet | 73

Mounng an EX9251 Switch on a 19-in. Rack | 74

Installing an EX9251 Switch in an ETSI Rack | 77

Connecng the EX9251 to Power | 82

Connect Earth Ground to an EX Series Switch | 82

Connecng AC Power to an EX9251 Switch and Powering on the Switch | 92

Connecng DC Power to an EX9251 Switch and Powering on the Switch | 95

Connecng the EX9251 to External Devices | 99

Connect a Device to a Network for Out-of-Band Management | 100

Connect a Device to a Management Console Using an RJ-45 Connector | 100

Connecng the EX9251 Switch to External Clocking and Timing Devices | 102

Connecng 1-PPS and 10-MHz Timing Devices to the Switch | 103

Connecng a Time-of-Day Device to the Switch | 104

Connecng a BITS External Clocking Device to the Switch | 104

Connecng the EX9251 to the Network | 105

Install a Transceiver | 105

Connect a Fiber-Opc Cable | 108

Conguring Junos OS on the EX9251 | 109

EX9251 Switch Default Conguraon | 109

Connecng and Conguring an EX9251 Switch (CLI Procedure) | 110

Maintaining Components

Roune Maintenance Procedures for EX9251 Switches | 116

Maintaining the Roung Engine in EX9251 Switches | 117

Maintaining the EX9251 Cooling System | 118

Removing a Fan Tray from an EX9251 Switch | 118

Installing a Fan Tray in an EX9251 Switch | 119

Maintaining Fan Trays in EX9251 Switches | 121

Maintaining the EX9251 Power System | 122

Powering O an EX9251 Switch | 122

Removing an AC Power Supply from an EX9251 Switch | 123

Installing an AC Power Supply in an EX9251 Switch | 125

Removing a DC Power Supply from an EX9251 Switch | 126

Installing a DC Power Supply in an EX9251 Switch | 128

Maintaining Power Supplies in EX9251 Switches | 130

Maintaining Transceivers | 132

Remove a Transceiver | 132

Install a Transceiver | 135

Remove a QSFP28 Transceiver | 137

Install a QSFP28 Transceiver | 139

Maintain Fiber-Opc Cables | 141

Connect a Fiber-Opc Cable | 142

Disconnect a Fiber-Opc Cable | 143

How to Handle Fiber-Opc Cables | 143

Troubleshoong Hardware

Troubleshoong EX9251 Components | 146

Troubleshoong the Cooling System in an EX9251 Switch | 146

Troubleshoong Power Supplies in an EX9251 Switch | 147

Troubleshoot Temperature Alarms in EX Series Switches | 149

Contacng Customer Support and Returning the Chassis or Components

Returning an EX9251 Chassis or Components | 157

Returning an EX9251 Switch or Component for Repair or Replacement | 157

Locang the Serial Number on an EX9251 Switch or Component | 158

Locang the Serial Number ID Label on an EX9251 Switch Chassis | 158

Locang Serial Number ID Labels on FRU Components | 159

Contact Customer Support to Obtain a Return Material Authorizaon | 160

Packing an EX9251 Switch or Component | 161

Packing an EX9251 Switch | 162

Packing EX9251 Switch Components for Shipping | 163

Safety and Compliance Informaon

General Safety Guidelines and Warnings | 166

Denions of Safety Warning Levels | 167

Qualied Personnel Warning | 169

Warning Statement for Norway and Sweden | 169

Fire Safety Requirements | 170

Installaon Instrucons Warning | 171

Chassis and Component Liing Guidelines | 172

Restricted Access Warning | 172

Ramp Warning | 174

Rack-Mounng and Cabinet-Mounng Warnings | 174

Grounded Equipment Warning | 178

Radiaon from Open Port Apertures Warning | 179

Laser and LED Safety Guidelines and Warnings | 180

Maintenance and Operaonal Safety Guidelines and Warnings | 183

General Electrical Safety Guidelines and Warnings | 189

Acon to Take Aer an Electrical Accident | 190

Prevenon of Electrostac Discharge Damage | 191

AC Power Electrical Safety Guidelines | 192

AC Power Disconnecon Warning | 193

DC Power Electrical Safety Guidelines | 194

DC Power Disconnecon Warning | 195

DC Power Grounding Requirements and Warning | 197

DC Power Wiring Sequence Warning | 197

DC Power Wiring Terminaons Warning | 199

Mulple Power Supplies Disconnecon Warning | 200

TN Power Warning | 201

vii

Agency Approvals for EX9251 Switches | 202

Compliance Statements for EMC Requirements for EX Series Switches | 204

Compliance Statements for Acousc Noise for EX Series Switches | 208

viii

About This Guide

Use this guide to install hardware and perform inial soware conguraon, roune maintenance, and

troubleshoong for the EX9251 switch. Aer compleng the installaon and basic conguraon

procedures covered in this guide, refer to the Junos OS documentaon for informaon about further

soware conguraon.

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