Juniper MX204 Istruzioni per l'installazione

MX204 3D Universal Edge Router Hardware Guide

Modified: 2018-06-11

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

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

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.

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

1— ESD points

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

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.

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

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

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

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

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

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

Documentation

•Routine Maintenance Procedures for MX204 Routers on page 113

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).

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

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.

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–

Chapter 3: Cooling System

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