Juniper MX204 Hardware Guide
MX204 Universal Routing Platform
Published
2020-11-11
Hardware Guide
Juniper Networks, Inc.
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Sunnyvale, California 94089
USA
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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.
MX204 Universal Routing Platform Hardware Guide
Copyright © 2020 Juniper Networks, Inc. All rights reserved.
The information in this document is current as of the date on the title page.
ii
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.
Table of Contents
1
About the Documentation | x
Documentation and Release Notes | x
Using the Examples in This Manual | x
Merging a Full Example | xi
Merging a Snippet | xii
Documentation Conventions | xii
Documentation Feedback | xv
Requesting Technical Support | xv
Self-Help Online Tools and Resources | xvi
Creating a Service Request with JTAC | xvi
iii
Overview
MX204 Router Overview | 18
Benefits of MX204 Router | 18
System Overview | 19
MX204 Chassis | 20
MX204 Chassis Description | 20
MX204 Component Redundancy | 22
MX204 Field-Replaceable Units | 23
MX204 Hardware Components and CLI Terminology | 23
MX204 Front and Rear Panel Components | 24
Front Panel Components | 24
Rear Panel Components | 25
Alarm LEDs on the MX204 Front Panel | 25
MX204 Cooling System | 26
MX204 Cooling System Description | 26
Fan Trays | 26
Airflow | 27
Power Supply Cooling System | 28
MX204 Fan Status LED | 28
MX204 AC Power System | 29
2
MX204 Power System Description | 30
AC Power Supply Description | 31
DC Power Supply Description | 31
MX204 Power Supply Module LEDs | 32
AC Power Supply Module LEDs | 32
DC Power Supply Module LEDs | 34
MX204 Router AC Power Specifications | 35
AC Power Circuit Breaker Requirements for the MX204 Router | 36
AC Power Cord Specifications for MX204 Routers | 37
MX204 DC Power System | 39
MX204 Router DC Power Specifications | 39
DC Power Circuit Breaker Requirements for the MX204 Router | 40
iv
DC Power Source Cabling for MX204 Router | 41
DC Power Cable Specifications for MX204 Router | 42
DC Power Cable Lug Specifications | 42
DC Power Cable Specifications | 42
MX204 Host Subsystem | 43
MX204 Routing Engine Description | 43
Routing Engine Functions | 43
Routing Engine Components | 44
Routing Engine Front Panel | 44
Routing Engine Interface Ports | 45
MX204 Routing Engine LEDs | 46
Site Planning, Preparation, and Specifications
MX204 Site Preparation Checklist | 50
MX204 Site Guidelines and Requirements | 51
MX204 Router Physical Specifications | 52
MX204 Router Environmental Specifications | 52
MX204 Router Grounding Specifications | 54
Grounding Points Specifications | 54
Grounding Cable Lug Specifications | 54
Grounding Cable Specifications | 55
MX204 Router Cabinet Requirements and Specifications | 55
MX204 Router Clearance Requirements for Airflow and Hardware Maintenance | 57
MX204 Router Rack Requirements | 58
MX204 Network Cable and Transceiver Planning | 60
Calculating Power Budget and Power Margin for Fiber-Optic Cables | 60
How to Calculate Power Budget for Fiber-Optic Cable | 60
How to Calculate Power Margin for Fiber-Optic Cable | 61
CB-RE and RCB Interface Cable and Wire Specifications for MX Series Routers | 62
Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion | 63
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable | 63
Attenuation and Dispersion in Fiber-Optic Cable | 64
MX204 Management and Console Port Specifications and Pinouts | 65
v
RJ-45 Connector Pinouts for MX Series CB-RE or RCB Auxillary and Console Ports | 65
RJ-45 Connector Pinouts for an MX Series CB-RE or RCB Management Port | 66
MX204 Power Planning | 67
Power Consumption for an AC-Powered MX204 Router | 67
Power Requirements for MX204 Components | 67
Calculating System Thermal Output | 68
Power Consumption for a DC-Powered MX204 Router | 69
Power Requirements for MX204 Components | 69
Calculating System Thermal Output | 70
Initial Installation and Configuration
3
MX204 Installation Overview | 72
Unpacking the MX204 | 73
Tools and Parts Required to Unpack the MX204 Router | 73
Unpacking MX204 Router | 74
Verifying the MX204 Router Parts Received | 75
Installing the MX204 | 76
Tools Required to Install the MX204 Chassis in Rack | 77
Installing the MX204 Chassis in a Rack | 77
Installing the MX204 Chassis in a 19-in. Rack | 78
Installing the MX204 in a 21-in. ETSI Rack | 80
Connecting the MX204 to Power | 84
vi
Tools and Parts Required for MX204 Router Grounding and Power Connections | 84
Grounding the MX204 Router | 85
Connecting Power to an AC-Powered MX204 Router | 86
Powering On an AC-Powered MX204 Router | 89
Connecting Power to a DC-Powered MX204 Router | 90
Powering On a DC-Powered MX204 Router | 93
Powering Off the MX204 Router | 94
Connecting the MX204 to the Network | 96
Tools and Parts Required to Connect the MX204 Router to External Devices | 96
Connecting the MX204 Router to External Devices and Cables | 96
Connecting the Router to a Network for Out-of-Band Management | 97
Connecting the Router to a Console Device | 98
Connecting the Router to External Clocking and Timing Devices | 100
Performing the Initial Software Configuration for the MX204 Router | 103
Maintaining Components
4
5
Maintaining MX204 Components | 109
Routine Maintenance Procedures for MX204 Routers | 109
Maintaining the MX204 Routing Engine | 109
Replace an SFP, SFP+, or QSFP+ Transceiver | 111
Remove a Transceiver | 111
Install a Transceiver | 113
Replace a QSFP28 Transceiver | 115
Remove a QSFP28 Transceiver | 116
Install a QSFP28 Transceiver | 117
Maintaining MX204 Cooling System Components | 120
Maintaining the MX204 Fan Module | 120
Replacing an MX204 Fan Module | 121
vii
Removing an MX204 Fan Module | 122
Installing an MX204 Fan Module | 123
Maintaining MX204 Power System Components | 124
Maintaining the MX204 Power Supplies | 124
Replacing an MX204 AC Power Supply | 126
Removing an MX204 AC Power Supply | 126
Installing an MX204 AC Power Supply | 127
Replacing an MX204 DC Power Supply | 128
Removing an MX204 DC Power Supply | 128
Installing an MX204 DC Power Supply | 130
Contacting Customer Support and Returning the Chassis or Components
Contacting Customer Support and Returning the Chassis or Components | 134
Contacting Customer Support | 134
Contact Customer Support to Obtain Return Material Authorization | 135
Locating the Serial Number on an MX204 Router or Component | 136
Listing the Chassis and Component Details Using the CLI | 136
Locating the Chassis Serial Number ID Label on an MX204 | 137
Locating the Serial Number ID Labels on MX204 Power Supplies | 137
Locating the Serial Number ID Label on an MX204 Fan Module | 138
6
Guidelines for Packing Hardware Components for Shipment | 139
Safety and Compliance Information
Definitions of Safety Warning Levels | 142
General Safety Guidelines and Warnings | 145
General Safety Warnings for Juniper Networks Devices | 146
Qualified Personnel Warning | 147
Restricted-Access Area Warning | 148
Fire Safety Requirements | 150
Fire Suppression | 150
Fire Suppression Equipment | 151
Installation Instructions Warning | 152
viii
Chassis and Component Lifting Guidelines | 152
Ramp Warning | 153
Rack-Mounting and Cabinet-Mounting Warnings | 153
Laser and LED Safety Guidelines and Warnings | 158
General Laser Safety Guidelines | 159
Class 1 Laser Product Warning | 160
Class 1 LED Product Warning | 161
Laser Beam Warning | 162
Radiation from Open Port Apertures Warning | 163
Maintenance and Operational Safety Guidelines and Warnings | 164
Battery Handling Warning | 165
Jewelry Removal Warning | 166
Lightning Activity Warning | 168
Operating Temperature Warning | 169
Product Disposal Warning | 171
General Electrical Safety Guidelines and Warnings | 172
Prevention of Electrostatic Discharge Damage | 173
Site Electrical Wiring Guidelines | 174
AC Power Electrical Safety Guidelines | 175
AC Power Disconnection Warning | 177
DC Power Disconnection Warning | 178
DC Power Grounding Requirements and Warning | 180
DC Power Wiring Sequence Warning | 182
DC Power Wiring Terminations Warning | 185
Multiple Power Supplies Disconnection Warning | 188
TN Power Warning | 189
ix
Action to Take After an Electrical Accident | 189
Agency Approvals for MX204 Router | 190
Compliance Statements for NEBS | 192
Compliance Statements for EMC Requirements | 192
Canada | 192
European Community | 192
Israel | 193
Japan | 193
United States | 193
Compliance Statements for Environmental Requirements | 194
Compliance Statements for Acoustic Noise for MX204 Router | 194
Statements of Volatility for Juniper Network Devices | 194
About the Documentation
IN THIS SECTION
Documentation and Release Notes | x
Using the Examples in This Manual | x
Documentation Conventions | xii
Documentation Feedback | xv
Requesting Technical Support | xv
Use this guide to install hardware and perform initial software configuration, routine maintenance, and
troubleshooting for the MX204 Universal Routing Platform. After completing the installation and basic
configuration procedures covered in this guide, refer to the Junos OS documentation for information about
further software configuration.
x
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.
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;
}
}
}
}
xi
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
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]
xii
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 xiii defines notice icons used in this guide.
Table 1: Notice Icons
xiii
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 xiii 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
Table 2: Text and Syntax Conventions (continued)
xiv
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;
}
}
}
Table 2: Text and Syntax Conventions (continued)
xv
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
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/
•
xvi
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/.
1
CHAPTER
Overview
MX204 Router Overview | 18
MX204 Chassis | 20
MX204 Cooling System | 26
MX204 AC Power System | 29
MX204 DC Power System | 39
MX204 Host Subsystem | 43
MX204 Router Overview
The Juniper Networks MX204 Universal Routing Platform is an Ethernet-optimized edge router with
400-Gbps capacity that provides both switching and carrier-class Ethernet routing. The MX204 router
runs Junos operating system (Junos OS), enabling a wide range of business and residential applications
and services, including high-speed transport and virtual private network (VPN) services, next-generation
broadband multiplay services, and high-volume Internet data center internetworking. Each router provides
full duplex, high-density Ethernet interfaces and high-capacity switching throughput and uses the Junos
Trio chipset for increased scalability of Layer 2 and Layer 3 packet forwarding, buffering, and queuing.
Benefits of MX204 Router
System Capacity—MX204 provides 400 Gbps of throughput and supports high-density 100-Gigabit
•
Ethernet interfaces, and also discrete and breakout 10-Gigabit Ethernet and 1-Gigabit Ethernet
interfaces—all in a single rack unit while consuming only 0.9 W/Gb.
18
The Programmable Chipset—The chipset implemented in the MX Series routers has a programmable
•
forwarding data structure that allows fast microcode changes in the hardware itself, and a programmable
lookup engine that allows inline service processing. the chip’s programmable QoS engine supports coarse
and fine-grained queuing to address the requirements of core, edge, and aggregation use cases.
Application-Aware Networking—On MX Series routers you can use deep packet inspection to detect
•
applications, and by using the user-defined policies, you can determine traffic treatment for each
application. This feature enables highly customized and differentiated services at scale.
Junos Telemetry Interface—Using the Junos telemetry interface data, you can stream component-level
•
data to monitor, analyze, and enhance the performance of the network. Analytics derived from this
streaming telemetry can identify current and trending congestion, resource utilization, traffic volume,
and buffer occupancy.
Integrated Hardware-Based Timing— You do not need to use external clocks because MX Series routers
•
support highly scalable and reliable hardware-based timing, including Synchronous Ethernet for frequency,
and the Precision Time Protocol (PTP) for frequency and phase synchronization. Synchronous Ethernet
and PTP can be combined in a hybrid mode to achieve a high level of frequency (10 ppb) and phase (<1.5
uS) accuracy.
System Overview
g009860
g0 09861
The MX204 router is compact and one rack unit (1 U) tall. Several routers can be stacked in a single
floor-to-ceiling rack for increased port density per unit of floor space.
The MX204 router is a fixed-configuration router, and supports one built-in Routing Engine. The router
runs on AC or DC power, with two dedicated power supply modules on each device. Cooling is handled
by three fan modules.
The MX204 has four rate-selectable ports that can be configured as 100-Gigabit Ethernet ports or 40-Gigabit
Ethernet ports, or each port can be configured as four 10-Gigabit Ethernet ports (by using a breakout
cable). The MX204 also has eight 10-Gigabit Ethernet ports. The four rate-selectable ports support QSFP28
and QSFP+ transceivers, whereas the eight 10-Gigabit Ethernet ports support SFP+ transceivers.
Figure 1 on page 19 shows the front view of the MX204 router.
Figure 1: Front View of the MX204 Router
19
The MX204 router is a fixed-configuration router, and supports one built-in Routing Engine. The router
runs on AC or DC power, with two dedicated power supply modules on each device. Cooling is handled
by three fan modules. Table 3 on page 19 shows the components supported on the router.
Table 3: MX204 Router Components
DescriptionComponent
2Power supply module
3Fan module
MX204 Chassis
g009860
IN THIS SECTION
MX204 Chassis Description | 20
MX204 Component Redundancy | 22
MX204 Field-Replaceable Units | 23
MX204 Hardware Components and CLI Terminology | 23
MX204 Front and Rear Panel Components | 24
Alarm LEDs on the MX204 Front Panel | 25
20
MX204 Chassis Description
The router chassis is a rigid sheet metal structure that houses all the other router components.
Figure 2 on page 20 shows the front of the fully configured chassis. The chassis measures 1.72 in. (4.37 cm)
high, 19 in. (48.26 cm) wide, and 18.5 in. (47.0 cm) deep. You can install the router chassis in standard
760-mm deep (or larger) enclosed cabinets, 19-in. equipment racks, or telco open-frame racks. The total
weight of fully loaded router is 22.7 lb (10.3 kg). For more information, see “MX204 Router Physical
Specifications” on page 52.
Figure 2: Front View of the MX204 Router
The MX204 has four rate-selectable ports that can be configured as 100-Gigabit Ethernet ports or 40-Gigabit
Ethernet ports, or each port can be configured as four 10-Gigabit Ethernet ports (by using a breakout
cable). The MX204 also has eight 10-Gigabit Ethernet ports. The four rate-selectable ports support QSFP28
and QSFP+ transceivers, whereas the eight 10-Gigabit Ethernet ports support SFP+ transceivers. For more
information on the rate selectability support for the MX204 router, see MX204 Router Port Speed Overview.
Starting in Junos OS Release 18.3R1, you can use the Mellanox 10-Gbps pluggable adapter (QSFP+ to
SFP+ adapter or QSA; model number: MAM1Q00A-QSA) to convert four lane-based ports to a single
lane-based SFP+ port. The QSA adapter has the QSFP+ form factor with a receptacle for the SFP+ module.
Use the QSA adapter to convert a 40-Gbps port to a 10-Gbps (SFP+) or a 1-Gbps (SFP) port. The 1-Gbps
g009862
1 2
g009863
1 2
SFP port supports auto-negotiation. You can configure auto-negotiation by using the command set
interfaces interface-name gigether-options auto-negotiation. For more information, see auto-negotiation.
NOTE:
The interface name prefix must be xe.
•
Rate selectability at PIC level and port level does not support 1-Gbps speed.
•
NOTE: For a complete list of supported optics on MX204, see MX204 Transceivers.
The router comes in two variants–AC-powered and DC-powered. Figure 3 on page 21 and
Figure 4 on page 21 shows the rear of the fully configured chassis.
21
Figure 3: Rear View of the AC-Powered MX204 Router
2—1— Power supply modules (AC)Fan modules
Figure 4: Rear View of the DC-Powered MX204 Router
2—1— Power supply modules (DC)Fan modules
The electrostatic discharge (ESD) points on the router are located both on the front and on the rear of the
chassis. Figure 5 on page 22 shows the electrostatic discharge (ESD) point on the router.
CAUTION: Before removing or installing components, attach an ESD strap to an ESD
point, and place the other end of the strap around your bare wrist. Failure to use an
ESD strap could result in damage to the hardware components.
Figure 5: ESD Points on the MX204 Router
g009883
Front panel Rear panel
11
1—ESD points
MX204 Component Redundancy
A fully configured router is designed so that at no single point of failure can cause the entire system to
fail. Only a fully configured router provides complete redundancy. All other configurations provide partial
redundancy. The following major hardware components are redundant:
22
Power supplies—The router supports two power supply modules. The MX204 router provides 1+1
•
redundancy for the system. Both AC and DC systems can withstand the failure of a single power supply
without system interruption in 1+1 redundancy mode. If one power supply fails in a fully redundant
system, the other power supply can provide full power to the router indefinitely.
Cooling system—The cooling system has a total of three fan modules, which are controlled and monitored
•
by the host subsystem. A fully configured router needs all the fan modules to operate normal. The fan
modules are at the rear and are used to cool the router. If a fan fails or the temperature of the chassis
rises above the temperature threshold, the speed of the remaining fans is automatically adjusted to keep
the temperature within the acceptable range.
CAUTION: For a fully configured router, all the three fan modules and the two power
supply modules must be operational, and in the event of any module failure the failed
module must be replaced immediately.
SEE ALSO
Locating the Serial Number on an MX204 Router or Component | 136
Guidelines for Packing Hardware Components for Shipment | 139
How to Return a Hardware Component to Juniper Networks, Inc.
MX204 Field-Replaceable Units
Field-replaceable units (FRUs) are router components that can be replaced at the customer site. Replacing
most FRUs requires minimal router downtime. The router uses the following types of FRUs:
Power supply modules (if redundant)
•
Fan modules (if redundant)
•
Transceiver modules
•
SEE ALSO
Replacing an MX204 AC Power Supply | 126
Replacing an MX204 DC Power Supply | 128
Replacing an MX204 Fan Module | 121
23
MX204 Hardware Components and CLI Terminology
The MX204 router support the components in Table 4 on page 23, listed in alphabetic order.
Table 4: MX204 Router Hardware Components and CLI Terminology
Hardware Model
DescriptionCLI Name
“MX204 Chassis Description” on
page 20
“MX204 Cooling System
Description” on page 26
“MX204 Power System
Description” on page 30
Cooling system
Power system components
Power supply module
NumberComponent
JNP-FAN-1RUFan module
JPSU-650W-AC-AO
•
JPSU-650W-DC-AFO
•
JNP204 [MX204]MX204Chassis
Fan Tray, Front to Back
Airflow - AFO
AC AFO 650W PSU
•
DC AFO 650W PSU
•
N/APICN/A (built-in)MIC
N/AFPCN/A (built-in)MPC
Table 4: MX204 Router Hardware Components and CLI Terminology (continued)
Hardware Model
NumberComponent
DescriptionCLI Name
N/ARE-S-1600x8N/A (built-in)Routing Engine
24
Transceiver
Module Reference.
Hardware Compatibility ToolXcvrSee MX Series Interface
Table 5 on page 24 lists the spare parts and blank panels available for the router.
Table 5: MX204 Spare Parts and Blank Panels
DescriptionModel Number
MX204 chassis, spareJNP204-CHAS
MX204 power blank cover panelJNP-PWR-BLNK-1
MX204 Front and Rear Panel Components
IN THIS SECTION
Front Panel Components | 24
Rear Panel Components | 25
Front Panel Components
The front panel on the front of the router enables you to view status and troubleshooting information at
a glance. The front panel contains LEDs for the router components, online/offline and reset buttons,
auxiliary and console ports, clocking ports, and interface ports. “MX204 Chassis Description” on page 20
shows the front of the fully configured chassis.
Rear Panel Components
The rear panel of the router has slots for the power supply modules and fan modules. The power and fan
modules are installed from the rear of the router. “MX204 Chassis Description” on page 20 and “MX204
Chassis Description” on page 20 shows the rear of the fully configured chassis.
Table 6 on page 25 lists the components on the rear panel of the MX204 router.
Table 6: Rear Panel Components in a Fully Configured MX204 Router
Number of FRUsSlotsComponent
20 and 1Power supply module
30 through 2Fan module
25
Alarm LEDs on the MX204 Front Panel
One alarm LED—labeled ALM—is located on the front panel of the router. A red light indicates a critical
condition that can result in a system shutdown, and a yellow light indicates a less severe condition that
requires monitoring or maintenance.
Table 7 on page 25 describes the alarm LED in more detail.
Table 7: Alarm LED on the MX204 Front Panel
DescriptionColorShape
Red
Yellow
Critical alarm—Indicates a critical condition that
can cause the router to stop functioning. Possible
causes include component removal, failure, or
overheating.
Warning alarm—Indicates a serious but nonfatal
error condition, such as a maintenance alert or
a significant increase in component temperature.
SEE ALSO
Routine Maintenance Procedures for MX204 Routers | 109
MX204 Cooling System
IN THIS SECTION
MX204 Cooling System Description | 26
MX204 Fan Status LED | 28
MX204 Cooling System Description
IN THIS SECTION
26
Fan Trays | 26
Airflow | 27
Power Supply Cooling System | 28
The cooling system components work together to keep all router components within the acceptable
temperature range.
The cooling system consists of the following features and components:
Fan Trays
The chassis monitors the temperature of the router components. When the router is operating normally,
the fans function at lower than full speed. If a fan fails or the ambient temperature rises above a threshold,
the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable
range. If the ambient maximum temperature specification is exceeded and the system cannot be adequately
cooled, the Routing Engine shuts down the system by disabling output power from each power supply.
The router has three fan modules (or fan trays) that install in the rear of the router. Each fan modules
contain one counter-rotating fan. The fan modules are hot-insertable and hot-removable field-replaceable
units (FRUs) (see Figure 6 on page 27).
Figure 6: Fan Module
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1
2 2
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27
2—1— LatchCaptive screw
Airflow
The router has front-to-back (AIR OUT) cooling system (see Figure 7 on page 28). Air is pulled through
the front the chassis toward the fan tray, where it is exhausted out of the system.
Figure 7: Airflow Through the Router
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Ports
FRUs
Power Supply Cooling System
28
The power supply modules are self-cooling and are located in the rear of the router. Each power supply
module has it’s own built-in fan that cools the power supply module. The exhaust for the power supply
modules are also located on the rear of the chassis.
SEE ALSO
Maintaining the MX204 Fan Module | 120
Maintaining the MX204 Power Supplies | 124
Maintaining the MX204 Routing Engine | 109
Replacing an MX204 AC Power Supply | 126
Replacing an MX204 DC Power Supply | 128
Replacing an MX204 Fan Module | 121
MX204 Fan Status LED
The MX204 fan module does not have any LED—the fan status LEDs are located on the MX204 chassis.
Figure 8 on page 29 shows the fan status LEDs.
Figure 8: Fan Status LEDs on the Router
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1—Fan status LEDs
The fan status LED is a bicolor LED. Table 8 on page 29 describes the behavior of the fan status LED.
Table 8: Fan Status LED
DescriptionStateColor
29
BlinkingGreen
steadily
Red
steadily
Fan module hardware initialization is complete and software initialization is
pending.
Software initialization is complete and the fan is functioning normally.On
Fan module is faulty and not functioning normally.On
Fan module not presentOff–
SEE ALSO
Replacing an MX204 Fan Module | 121
Maintaining the MX204 Fan Module | 120
MX204 AC Power System
IN THIS SECTION
MX204 Power System Description | 30
MX204 Power Supply Module LEDs | 32
MX204 Router AC Power Specifications | 35
AC Power Circuit Breaker Requirements for the MX204 Router | 36
AC Power Cord Specifications for MX204 Routers | 37
MX204 Power System Description
IN THIS SECTION
AC Power Supply Description | 31
DC Power Supply Description | 31
30
The MX204 is powered using either AC or DC power. It supports two power supply modules (PSMs)
located at the rear of the chassis in slots 0 and 1. Figure 9 on page 31 and Figure 10 on page 32 show the
MX204 PSMs. The AC or DC power supply modules directly plug on to main board and are placed on the
right side of the rear chassis. Each power supply has a handle, an ejector lever, and status LEDs. The power
supply modules connect to the PSM board, which distributes the different output voltages produced by
the power supply modules to the router components, depending on their voltage requirements. When
both the power supply modules are present, they share power almost equally within a fully populated
system. If the first power supply in a redundant configuration fails or is removed, the second power supply
assumes the entire electrical load without interruption. A single power supply provides the maximum
configuration with full power for as long as the router is operational. A second power supply can be installed
for redundancy. The chassis is designed to support 1+1 feed redundancy.
Redundant power supply is hot-removable and hot-insertable. If you remove a power supply from a router
that uses only one power supply, then the router shuts down.
CAUTION: Do not mix AC and DC power supply modules in the same chassis.
NOTE: Routers configured with only one power supply are shipped with a blank panel installed
over the power supply slot that is not populated.
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