Juniper EX9251 Installation instructions

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
Copyright © 2022 Juniper Networks, Inc. All rights reserved.
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.
ii

Table of Contents
About This Guide | ix
1
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
2
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
3
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
Register Products—Mandatory to Validate SLAs | 72
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
iv

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
4
Maintaining Components
Roune Maintenance Procedures for EX9251 Switches | 116
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
v

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
5
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
6
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
7
Safety and Compliance Informaon
General Safety Guidelines and Warnings | 166
vi

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.
RELATED DOCUMENTATION
EX9251 Switch Quick Start
ix

1
CHAPTER
Overview
EX9251 System Overview | 2
EX9251 Chassis | 9
EX9251 Cooling System | 19
EX9251 Power System | 23