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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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— 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