Juniper MX204 Installation instructions

MX204 3D Universal Edge Router Hardware Guide
Modified: 2018-06-11
Copyright © 2018, Juniper Networks, Inc.

Figure 1: Front View of the MX204 Router
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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 4 shows the
components supported on the router.
Table 3: MX204 Router Components
DescriptionComponent
2Power supply module
3Fan module
Related
Documentation
•MX204 Chassis Description on page 5
•MX204 Cooling System Description on page 11
•MX204 Front and Rear Panel Components on page 8
•MX204 Power System Description on page 21
•MX204 Router Physical Specifications on page 29
Copyright © 2018, Juniper Networks, Inc.4
MX204 3D Universal Edge Router Hardware Guide

CHAPTER 2
Chassis Components and Descriptions
•MX204 Chassis Description on page 5
•MX204 Component Redundancy on page 6
•MX204 Field-Replaceable Units on page 7
•MX204 Hardware Components and CLI Terminology on page 8
•MX204 Front and Rear Panel Components on page 8
•Alarm LEDs on the MX204 Front Panel on page 9
MX204 Chassis Description
The router chassis is a rigid sheet metal structure that houses all the other router
components. Figure 2 on page 5 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 29.
Figure 2: Front View of the MX204 Router
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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.
The router comes in two variants–AC-powered and DC-powered. Figure 3 on page 6
and Figure 4 on page 6 shows the rear of the fully configured chassis.
5Copyright © 2018, Juniper Networks, Inc.

Figure 3: Rear View of the AC-Powered MX204 Router
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1 2
2—1— Power supply modules (AC)Fan modules
Figure 4: Rear View of the DC-Powered MX204 Router
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1 2
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 6 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
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Front panel Rear panel
11
1— ESD points
Related
Documentation
MX204 Router Overview on page 3•
•MX204 Router Physical Specifications on page 29
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
Copyright © 2018, Juniper Networks, Inc.6
MX204 3D Universal Edge Router Hardware Guide

other configurations provide partial redundancy. The following major hardware
components are redundant:
•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.
Related
Documentation
MX204 Router Overview on page 3•
•Locating the Serial Number on an MX204 Router or Component on page 125
•Guidelines for Packing Hardware Components for Shipment on page 122
•Returning a Hardware Component to Juniper Networks, Inc. on page 123
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
Related
Documentation
MX204 Hardware Components and CLI Terminology on page 8•
•Replacing an MX204 AC Power Supply on page 97
•Replacing an MX204 DC Power Supply on page 99
•Replacing an MX204 Fan Module on page 95
7Copyright © 2018, Juniper Networks, Inc.
Chapter 2: Chassis Components and Descriptions

MX204 Hardware Components and CLI Terminology
The MX204 router support the components in Table 4 on page 8, listed in alphabetic
order.
Table 4: MX204 Router Hardware Components and CLI Terminology
DescriptionCLI NameHardware Model NumberComponent
“MX204 Chassis Description” on
page 5
JNP204 [MX204]MX204Chassis
“MX204 Cooling System
Description” on page 11
Cooling system
Fan Tray, Front to Back
Airflow - AFO
JNP-FAN-1RUFan module
“MX204 Power System Description”
on page 21
Power system components
•AC AFO 650W PSU
•DC AFO 650W PSU
•JPSU-650W-AC-AO
•JPSU-650W-DC-AFO
Power supply module
N/APICN/A (built-in)MIC
N/AFPCN/A (built-in)MPC
N/ARE-S-2X00x6N/A (built-in)Routing Engine
Hardware Compatibility Tool
Xcvr
See MX Series Interface
Module Reference.
Transceiver
Table 5 on page 8 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
Related
Documentation
MX204 Router Overview on page 3•
•MX204 Chassis Description on page 5
MX204 Front and Rear Panel Components
•Front Panel Components on page 9
•Rear Panel Components on page 9
Copyright © 2018, Juniper Networks, Inc.8
MX204 3D Universal Edge Router Hardware Guide

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. Figure 2 on page 5 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. Figure 3 on page 6
and Figure 4 on page 6 shows the rear of the fully configured chassis.
Table 6 on page 9 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
Related
Documentation
MX204 Routing Engine Description on page 15•
•MX204 Chassis Description on page 5
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 9 describes the alarm LED in more detail.
Table 7: Alarm LED on the MX204 Front Panel
DescriptionColorShape
Critical alarm—Indicates a critical condition that can
cause the router to stop functioning. Possible causes
include component removal, failure, or overheating.
Red
Warning alarm—Indicates a serious but nonfatal
error condition, such as a maintenance alert or a
significant increase in component temperature.
Yellow
Related
Documentation
•Routine Maintenance Procedures for MX204 Routers on page 113
9Copyright © 2018, Juniper Networks, Inc.
Chapter 2: Chassis Components and Descriptions

CHAPTER 3
Cooling System
•MX204 Cooling System Description on page 11
•MX204 Fan Status LED on page 13
MX204 Cooling System Description
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 on page 11
•Airflow on page 12
•Power Supply Cooling System on page 13
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 12).
11Copyright © 2018, Juniper Networks, Inc.

Figure 6: Fan Module
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1
2 2
2—1— LatchCaptive screw
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Airflow
The router has front-to-back (AIR OUT) cooling system (see Figure 7 on page 12). 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
Copyright © 2018, Juniper Networks, Inc.12
MX204 3D Universal Edge Router Hardware Guide

Power Supply Cooling System
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.
Related
Documentation
Maintaining the MX204 Fan Module on page 115•
•Maintaining the MX204 Power Supplies on page 116
•Maintaining the MX204 Routing Engine on page 117
•Replacing an MX204 AC Power Supply on page 97
•Replacing an MX204 DC Power Supply on page 99
•Replacing an MX204 Fan Module on page 95
•
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 13 shows the fan status LEDs.
Figure 8: Fan Status LEDs on the Router
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1
1— Fan status LEDs
The fan status LED is a bicolor LED. Table 8 on page 13 describes the behavior of the fan
status LED.
Table 8: Fan Status LED
DescriptionStateColor
Fan module hardware initialization is complete and software
initialization is pending.
BlinkingGreen
Software initialization is complete and the fan is functioning
normally.
On steadily
Fan module is faulty and not functioning normally.On steadilyRed
Fan module not presentOff–
13Copyright © 2018, Juniper Networks, Inc.
Chapter 3: Cooling System

CHAPTER 4
Host Subsystem Components
•MX204 Routing Engine Description on page 15
•MX204 Routing Engine LEDs on page 17
MX204 Routing Engine Description
The host subsystem provides routing protocol processes, as well as software processes
that control the router’s interface, the chassis components, system management, and
user access to the router. These routing processes run on top of a kernel that interacts
with the Packet Forwarding Engine. The MX204 host subsystem consists of a single
built-in Routing Engine.
This topic covers:
•Routing Engine Functions on page 15
•Routing Engine Components on page 16
•Routing Engine Front Panel on page 16
•Routing Engine Interface Ports on page 16
Routing Engine Functions
The Routing Engine is built-in on the MX204 baseboard and cannot be replaced. The
Routing Engine performs all route-processing functions, and provides performs chassis
control and management plane functionality. The Routing Engine also provides control
plane functions.
The Routing Engine supports the following functionalities to manage the operation of
the router:
•System control functions such as environmental monitoring
•Routing Layer 2 and Layer 3 protocols
•Communication to components such as line cards, power supply, and cooling system
•Transparent clocking
•Alarm and logging functions
15Copyright © 2018, Juniper Networks, Inc.

Routing Engine Components
The Routing Engine consists of the following internal components:
•High-performance 1.6-GHz Intel 8 Core X86 CPU
•32-GB DDR4 RAM
•100-GB SATA SSD
Routing Engine Front Panel
Figure 9 on page 16 shows the front panel of the MX204 chassis.
Figure 9: MX204 Ports
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15
8
1016
732 4 6
9
1 5
1314 1112
9—1— RESET button Rate-selectable ports
10—2— SSD0 LEDManagement (MGMT) port
11—3— Alarm (ALM) LEDBITS port with LEDs
12—4— OK/FAIL LED USB port
13—5— Time of day (ToD) port with LEDs (This port
is reserved for future use)
1PPS and 10MHz GPS input and output
ports
14—6— Console (CON) portONLINE LED
15—7— 10-Gigabit Ethernet SFP+ ports
SSD1 LED
16—8— PTP grandmaster clock (GM/PTP) portOFFLINE button
Routing Engine Interface Ports
The ports located on the router connect the Routing Engine to one or more external
devices on which system administrators can issue Junos OS CLI commands to manage
the router. In addition, ports to connect external clock interfaces for BITS and GPS function
are also available on the router.
The Routing Engine interface ports with the indicated labels function are as follows (see
Figure 9 on page 16):
•CON—Connects the Routing Engine to a system console through a serial cable with an
RJ-45 connector.
•MGMT—Connects the Routing Engine through an Ethernet connection to a management
LAN (or any other device that plugs into an Ethernet connection) for out-of-band
management. The port uses an autosensing RJ-45 connector to support 10-Mbps,
Copyright © 2018, Juniper Networks, Inc.16
MX204 3D Universal Edge Router Hardware Guide

100-Mbps, or 1000-Mbps connections. Two small LEDs on the port indicate the
connection in use: the LED flashes yellow or green for a 10-Mbps, 100-Mbps, or
1000-Mbps connection, and the LED is lit green when traffic is passing through the
port.
•BITS—Building-integrated timing supply (BITS) external clocking interface for
connecting to external clocking devices.
•ToD—Time-of-day (TOD) port on the front panel of the router that enables you to
connect external timing signal sources.
NOTE: This port is reserved for future use.
•10MHZ (one input and one output)—The 10-MHz timing connectors on the front panel
of the router that connect 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.
•PPS (one input and one output)—1-pulse-per-second (PPS) connectors on the front
panel of the router that connect 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.
•USB—Provides a removable media interface through which you can install Junos OS
manually. Junos OS supports USB version 1.0 and later.
Related
Documentation
RJ-45 Connector Pinouts for MX Series CB-RE or RCB Auxillary and Console Ports on
page 55
•
•RJ-45 Connector Pinouts for an MX Series CB-RE or RCB Management Port on page 56
•MX204 Chassis Description on page 5
MX204 Routing Engine LEDs
The Routing Engine is built-in on the MX204 and is attached to the baseboard and cannot
be replaced. The status of the Routing Engine is displayed by the ONLINE and OK/FAIL
LEDs on the front panel of the MX204 chassis.
Table 9 on page 18 describes the functions and LEDs on the MX204 router.
NOTE: The functioning of the MX204 router is controlled by the Routing
Engine, and the LEDs present on the front panel of the router displays the
status and functioning of the MX204 router.
17Copyright © 2018, Juniper Networks, Inc.
Chapter 4: Host Subsystem Components

Table 9: MX204 LEDs
DescriptionStateColorLabel
Both Junos OS and Linux are successfully loaded on
the router.
On steadilyGreenONLINE
Router is starting Junos OS.Blinking
Router has loaded Linux.On steadilyRed
Router is starting Linux.Blinking
Router is offline.Off–
Router is functioning normally.On steadilyGreenOK/FAIL
Router has failed.BlinkingRed
Router is not powered on.Off–
Critical alarm—Indicates a critical condition that can
cause the router to stop functioning. Possible causes
include component failure, or any major software
failure.
On steadilyRedALM
Warning alarm—Indicates a serious but nonfatal
error condition, such as a maintenance alert or a
significant increase in component temperature.
On steadilyYellow
There is no alarm.Off–
SSD0 is being accessed by the router.BlinkingGreenSSD0
SSD0 is not active or not being accessed.Off–
SSD1 is being accessed by the router.BlinkingGreenSSD1
SSD1 is not active or not being accessed.Off–
Copyright © 2018, Juniper Networks, Inc.18
MX204 3D Universal Edge Router Hardware Guide

Table 9: MX204 LEDs (continued)
DescriptionStateColorLabel
When there is no loss (BITS is in locked state).On Steadily
(Activity
LED; left)
GreenBITS
When there is loss of signal or loss of line.Off
(Activity
LED; left)
–
When there is loss of signal or loss of line.On steadily
(Link LED;
right)
Amber
When there is no loss (BITS is in locked state).Off
(Link LED;
right)
–
Related
Documentation
•MX204 Routing Engine Description on page 15
19Copyright © 2018, Juniper Networks, Inc.
Chapter 4: Host Subsystem Components

CHAPTER 5
Power System Components and
Descriptions
•MX204 Power System Description on page 21
•MX204 Power Supply Module LEDs on page 23
MX204 Power System Description
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 0and 1.Figure 10 on page 22 and
Figure 11 on page 23 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.
The power supply modules are cooled by its own internal cooling system. A fan present
in the power supply module monitors and maintains the temperature inside.
•AC Power Supply Description on page 22
•DC Power Supply Description on page 22
21Copyright © 2018, Juniper Networks, Inc.

AC Power Supply Description
Each AC power supply weighs approximately 2.2 lb (1 kg) and consists of a handle, an
ejector lever, an AC appliance inlet, a fan, and status LEDs to monitor the status of the
power supply. Figure 10 on page 22 shows the AC power supply.
Each inlet requires a dedicated AC power feed and a dedicated customer-site circuit
breaker. We recommend that you use a minimum 20 A (110 VAC) or 16 A (220 VAC)
customer-site circuit breaker, or as required by local code.
WARNING: The router is pluggable type A equipment installed in a
restricted-access location. It has a separate protective earthing terminal
(sized for 10–32 screws) provided on the chassis in addition to the grounding
pin of the power supply cord. This separate protective earthing terminal must
be permanently connected to earth.
Figure 10: AC Power Supply
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DC Power Supply Description
Each DC power supply weighs approximately 2.2 lb (1 kg) and consists of a handle, an
ejection lever, status LEDs, and a terminal block that provides a single DC input (–48
VDC and return) that requires a dedicated customer site circuit breaker. We recommend
that you use a dedicated customer-site circuit breaker rated for 25 A (–48 VDC) minimum,
or as required by local code.
Figure 11 on page 23 shows the DC power supply.
Copyright © 2018, Juniper Networks, Inc.22
MX204 3D Universal Edge Router Hardware Guide

Figure 11: DC Power Supply
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Related
Documentation
MX204 Power Supply Module LEDs on page 23•
•Maintaining the MX204 Power Supplies on page 116
•MX204 Router AC Power Specifications on page 43
•MX204 Router DC Power Specifications on page 49
MX204 Power Supply Module LEDs
•AC Power Supply Module LEDs on page 23
•DC Power Supply Module LEDs on page 24
AC Power Supply Module LEDs
Figure 12 on page 23 shows the AC power supply module components along with the
status LEDs.
Figure 12: AC Power Supply Module LEDs and Components
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1
2
34
5
4—1— Ejector leverInput status LED
5—2— AC power cord retainer portOutput status LED
3—Fault LED
23Copyright © 2018, Juniper Networks, Inc.
Chapter 5: Power System Components and Descriptions

Figure 13 on page 24 shows the AC power supply module components with the AC power
cord retainer along with the status LEDs.
Figure 13: AC Power Supply Module LEDs and Components––with the AC Power Cord
Retainer
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1
2
35
4
4—1— AC power cord retainer installedInput status LED
5—2— Ejector leverOutput status LED
3—Fault LED
Table 10 on page 24 describes the LEDs on the AC power supply modules.
Table 10: AC Power Supply Module LEDs
DescriptionStateColorLabel
The power supply is disconnected from power source, or the power
supply is not receiving power.
OffUnlitAC OK
Power supply is receiving power.On steadilyGreen
Power supply output is off.OffUnlitDC OK
The power supply is sending out power correctly.On steadilyGreen
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.
On steadilyAmber!(Fault)
NOTE: If the AC OK LED and the DC OK LED are unlit, either the AC power
cord is not installed properly or the power supply fuse has failed. If the AC
OK LED is lit and the DC OK LED is unlit, the AC power supply is installed
properly, but the power supply has an internal failure.
DC Power Supply Module LEDs
Figure 14 on page 25 shows the DC power supply modules status LEDs.
Copyright © 2018, Juniper Networks, Inc.24
MX204 3D Universal Edge Router Hardware Guide

Figure 14: DC Power Suppy Module LEDs
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1 2 3
3—1— Fault LEDInput LED
2—Output LED
CAUTION: On the DC power supply, 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 11 on page 25 describes the LEDs on the DC power supply modules.
Table 11: DC Power Supply Module LEDs
DescriptionStateColorLabel
The power supply is disconnected from power
source, or the power supply is not receiving power.
OffUnlitIN (Input)
Power supply is receiving power.On steadilyGreen
Power supply output is off.OffUnlitOUT (Output)
The power supply is sending out power correctly.On steadilyGreen
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.
On steadilyAmber!(Fault)
Related
Documentation
•Routine Maintenance Procedures for MX204 Routers on page 113
•MX204 Power System Description on page 21
•Maintaining the MX204 Power Supplies on page 116
25Copyright © 2018, Juniper Networks, Inc.
Chapter 5: Power System Components and Descriptions