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

EX9251 System Overview
IN THIS SECTION
EX9251 Switch Hardware Overview | 2
EX9251 Switch Models | 7
EX9251 Switch Hardware and CLI Terminology Mapping | 7
EX9251 Switch Hardware Overview
IN THIS SECTION
Soware | 3
Benets of the EX9251 Switch | 3
EX9251 Switch Models | 3
Front Panel of an EX9251 Switch | 3
Rear Panel of an EX9251 Switch | 5
Roung Engine | 5
Power Supplies | 6
Cooling System | 6
Component Redundancy | 6
Juniper Networks EX9251 Ethernet Switch is an Ethernet-opmized switch that provides carrier-class
Ethernet switching. It is a xed conguraon switch with a built-in Roung Engine. It has a throughput
of up to 400 gigabits per second (Gbps).
The switch has eight 10-Gigabit Ethernet ports and four rate-selectable ports that you can congure as
100-Gigabit Ethernet ports or 40-Gigabit Ethernet ports; each rate-selectable port can be congured as
four 10-Gigabit Ethernet ports by using a breakout cable. The 10-Gigabit Ethernet ports support SFP+
transceivers and rate-selectable ports support QSFP28 and QSFP+ transceivers. The switch supports
two power supplies and three fan trays.
2

Soware
Juniper Networks EX Series Ethernet Switches run Junos OS, which provides Layer 2 and Layer 3
switching, roung, and security services. The same Junos OS code base that runs on EX Series switches
also runs on all Juniper Networks M Series, MX Series, and T Series routers, and SRX Series Services
Gateways.
Benets of the EX9251 Switch
Simplied network architecture—EX9251 switches deliver a simple, secure, virtualized network
environment that increases business agility. They are ideal for simplifying campus, data center, and
combined campus and data center network environments by collapsing network layers.
Support for Junos Fusion Enterprise—EX9251 switches support Junos Fusion Enterprise technology that
enables a large number of devices deployed throughout a building to be managed as a single, logical
device, thus reducing network complexity, simplifying network management, and lowering operaonal
costs.
EX9251 Switch Models
EX9251 switch is available in two models—with AC power supply and with DC power supply. See
"EX9251 Switch Models" on page 7.
Front Panel of an EX9251 Switch
Figure 1 on page 3 shows the front panel of an EX9251 switch.
Figure 1: Front Panel of an EX9251 Switch
1—Rate-selectable ports—These ports can
operate in 100G, 40G, and 10G speeds and
support transceivers and direct aach copper
(DAC) cables.
9—Reset buon—buon to reset the switch.
3

2—Management Ethernet port—This port
connects the switch to a management device
(or any other device that plugs into an
Ethernet connecon) for out-of-band
management through an Ethernet
connecon. The port uses an autosensing
RJ-45 connector to support 10-Mbps, 100-
Mbps, or 1000-Mbps connecons.
10—SSD0 LED—indicates the status of the solid-
state drive labeled SSD0.
3—BITS ports with LEDs—Building-integrated
ming supply (BITS) external clocking port,
that connects the switch to external clocking
devices.
11—Alarm LED—indicates alarms.
4—USB port—USB port, that provides a
removable media interface that you can use
to install Junos OS manually. Junos OS
supports USB version 1.0 and later.
12—OK/Fail LED—indicates the status of the
switch.
5—1PPS and 10 MHz GPS input and output
ming ports—1-pulse-per-second (PPS)
connectors and 10-MHz ming connectors
respecvely (one input and one output), that
connects the switch to external clock signal
sources. The clocking ports provide the
synchronized output clocks from any one of
the reference clock inputs based on the
clock’s priority.
13—Time of day (ToD) port with LED—ToD port,
that connects the switch to external ming
signal sources.
6—Online LED—indicates the status of the
switch and the operang system.
14—Console port—Console port, that connects
the switch to a system console through a
serial cable with an RJ-45 connector.
7—SSD1 LED—indicates the status of the solid-
state drive labeled SSD1.
15—10-Gigabit Ethernet SFP+ ports—support
SFP+ transceivers and direct aach copper
(DAC) cables.
8—Oine buon—buon to turn the switch
online or oine or to power on or power o
the switch.
16—PTP grandmaster clock (GM/PTP) port—PTP
grandmaster clock port, that connects the
switch to a ming device. Support for this
port is not available in this release.
4

Rear Panel of an EX9251 Switch
Figure 2 on page 5 shows the rear panel of an EX9251 switch with AC power supply. Figure 3 on
page 5 shows the rear panel of an EX9251 switch with DC power supply.
Figure 2: Rear Panel of an EX9251 Switch with AC Power Supply
1—Protecve earthing terminal 4—Fan tray LEDs
2—Electrostac discharge (ESD) point 5—AC power supply units
3—Fan trays
Figure 3: Rear Panel of an EX9251 Switch with DC Power Supply
1—Fan trays 2—DC power supply units
Roung Engine
EX9251 switches have a single built-in Roung Engine. It provides switching protocol processes and
soware processes that control the switch’s interface, the chassis components, system management,
and user access to the switch. These switching processes run on top of a kernel that interacts with the
Packet Forwarding Engine. The Roung Engine is built-in on the baseboard and cannot be replaced.
It supports the following funconalies to manage the operaon of the switch:
• System control funcons such as environmental monitoring
•Roung Layer 2 and Layer 3 protocols
5

•Communicaon to components such as power supplies and fan trays
• Transparent clocking
• Alarm and logging funcons
It consists of the following internal components:
• High-performance 1.6-GHz Intel 8 Core X86 CPU
• 32-GB DDR4 RAM
• 2x100-GB SATA SSD
Power Supplies
EX9251 switches support AC power supply and DC power supply. See "Power Supplies in an EX9251
Switch" on page 23.
CAUTION: Do not mix AC and DC power supplies in the same chassis.
Cooling System
The cooling system in an EX9251 switch consists of three fan trays. The fan trays are installed on the
rear panel of the chassis. Each fan tray contains one counter rotang fan. See "EX9251 Cooling System"
on page 19.
Component Redundancy
A fully congured EX9251 switch is designed such that no single point of failure can cause the enre
system to fail. The following major hardware components are redundant:
• Power supplies—The switch supports two power supplies. If one power supply fails in a fully
congured switch, the other power supply can provide full power to the switch.
• Cooling system—The switch supports three fan trays. If one fan fails or the temperature of the
chassis rises above the temperature threshold in a fully congured switch, the speed of the remaining
fans is automacally adjusted to keep the temperature within the acceptable range.
6

CAUTION: In a fully congured switch, all the three fan trays and the two power
supplies must be operaonal. In the event of any failure, the failed component must be
replaced immediately.
EX9251 Switch Models
EX9251 is available in two models—with AC power supply and with DC power supply. Table 1 on page
7 lists the models and the components included in each model.
Table 1: EX9251 Switch Models
Switch Models Conguraon Components First Junos OS
Release
EX9251-8X4C •Chassis
•Three fan trays
•Two AC power supplies
18.1R1
EX9251-8X4C-DC •Chassis
•Three fan trays
•Two DC power supplies
18.1R1
EX9251 Switch Hardware and CLI Terminology Mapping
This topic describes the hardware terms used in EX9251 switch documentaon and the corresponding
terms used in the Junos OS CLI. See Table 2 on page 8.
7

Table 2: CLI Equivalents of Terms Used in Documentaon for EX9251 Switches
Hardware
Item (CLI)
Descripon (CLI) Value (CLI) Item in
Documentaon
Addional Informaon
Chassis EX9251 – Switch chassis "Chassis Physical
Specicaons of an
EX9251 Switch" on
page 10
Roung
Engine
EX9251-RE 0 Roung Engine "EX9251 Switch
Hardware Overview"
on page 2
CB EX9251 0 Roung Engine "EX9251 Switch
Hardware Overview"
on page 2
FPC FPC 0 – –
PIC ( n ) Abbreviated name
of the Physical
Interface Card
(PIC). One of the
following:
•4XQSFP28 PIC
•8XSFPP PIC
n is a value in the range
0-1. The value
corresponds to the PIC
slot number.
– –
Xcvr ( n ) Abbreviated name
of the transceiver.
n is a value equivalent
to the number of the
port in which the
transceiver is installed.
Opcal transceivers Hardware
Compability Tool
page for EX9251
8

Table 2: CLI Equivalents of Terms Used in Documentaon for EX9251 Switches (Connued)
Hardware
Item (CLI)
Descripon (CLI) Value (CLI) Item in
Documentaon
Addional Informaon
PEM ( n ) One of the
following:
•AC AFO 650W
PSU
•JPSU-650W-
DC-AFO
n is a value in the range
0-1. The value
corresponds to the
power supply slot
number.
AC or DC power
supply
"Power Supplies in an
EX9251 Switch" on
page 23
Fan tray ( n ) Fan Tray, Front to
Back Airow - AFO
n is a value in the range
0-2. The value
corresponds to the fan
tray slot number.
Fan tray "EX9251 Cooling
System" on page 19
Table 3 on page 9 lists the spare parts and blank panels available for the switch. They must be ordered
separately.
Table 3: Spare Parts and Blank Panels
Model Number Descripon
EX9251-CHAS EX9251 chassis, spare
JNP-PWR-BLNK-1 EX9251 power supply slot blank panel
EX9251 Chassis
IN THIS SECTION
Chassis Physical Specicaons of an EX9251 Switch | 10
9

Field-Replaceable Units in an EX9251 Switch | 10
LEDs on the Front Panel of an EX9251 Switch | 12
Chassis Physical Specicaons of an EX9251 Switch
The EX9251 switch chassis is a rigid sheet-metal structure that houses all components of the switch.
EX9251 is available in two variants—with AC power supply and with DC power supply. Table 4 on page
10 summarizes the physical specicaons of the EX9251 switch chassis.
Table 4: Physical Specicaons of the EX9251 Switch Chassis
Descripon Weight Width Depth Height
Chassis 22.7 lb (10.3 kg) 19 in. (48.26 cm) •18.5 in. (47 cm)
•20.43 in.
(51.89 cm) with
fan tray and
power supply
handles
1.72 in. (4.37 cm)
Fan tray 0.29 lb (0.13 kg) 1.89 in. (4.8 cm) 5.78 in. (14.68 cm) 1.64 in. (4.17 cm)
AC power supply 2.2 lb (1 kg) 2.23 in. (5.66 cm) 14.5 in. (36.83 cm) 1.58 in. (4.01 cm)
DC power supply 2.2 lb (1 kg) 2.23 in. (5.66 cm) 14.53 in. (36.91 cm) 1.67 in. (4.24 cm)
You can mount an EX9251 switch on four posts of a 19-in. rack or an ETSI rack.
Field-Replaceable Units in an EX9251 Switch
Field-replaceable units (FRUs) are components that you can replace at your site. The FRUs in EX9251
switches are hot-removable and hot-insertable. You can remove and replace them without powering o
the switch. The FRUs in EX9251 switches are:
10

• Power supplies
• Fan trays
• Transceivers
NOTE: If you have a Juniper J-Care service contract, register any addion, change, or upgrade of
hardware components at hps://www.juniper.net/customers/support/tools/updateinstallbase/ .
Failure to do so can result in signicant delays if you need replacement parts. This note does not
apply if you replace exisng components with the same type of component.
To install an AC power supply in an EX9251 switch, follow instrucons in "Installing an AC Power Supply
in an EX9251 Switch" on page 125. To remove an AC power supply from an EX9251 switch, follow
instrucons in "Removing an AC Power Supply from an EX9251 Switch" on page 123.
To install a DC power supply in an EX9251 switch, follow instrucons in "Installing a DC Power Supply
in an EX9251 Switch" on page 128. To remove a DC power supply from an EX9251 switch, follow
instrucons in "Removing a DC Power Supply from an EX9251 Switch" on page 126.
To install a fan tray in an EX9251 switch, follow instrucons in "Installing a Fan Tray in an EX9251
Switch" on page 119. To remove a fan tray from an EX9251 switch, follow instrucons in "Removing a
Fan Tray from an EX9251 Switch" on page 118.
To install a transceiver in an EX9251 switch, follow instrucons in Install a Transceiver or Install a
QSFP28 Transceiver . To remove a transceiver from an EX9251 switch, follow instrucons in Remove a
Transceiver or Remove a QSFP28 Transceiver .
11