Juniper Networks MX960 User Manual 2

MX960 Ethernet Services Router
DC Power Supply
Installation Instructions

19 October 2007
Part Number: 530-017577-01
Revision 2

This document describes how to remove and replace a DC power supply on a Juniper
Networks MX960 Ethernet Services Router.

Contents

DC Power Supply ............................................................................................2

DC Power Supply Electrical Specifications ................................................2

DC Power Supply LEDs .............................................................................3

Replacing a DC Power Supply .........................................................................4

Removing a DC Power Supply ..................................................................4

Installing a DC Power Supply ....................................................................7

List of Technical Publications ........................................................................10

Requesting Support .......................................................................................16

Revision History ............................................................................................16

■ 1

MX960 Ethernet Services Router DC Power Supply Installation Instructions

DC Power Supply

In the DC power configuration, the router contains either two or four DC power
supplies (see Figure 1 on page 2), located at the lower rear of the chassis in
slots PEM0 through PEM3 (left to right). You can upgrade your DC power system from
two to four power supplies. The DC power supplies in slots PEM0 and PEM2 provide
power to the lower fan tray, DPC slots 6 through 11, and SCB slots 1 and 2. The DC
power supplies in slots PEM1 and PEM3 provide power to the upper fan tray, DPC
slots 0 through 5, and SCB slot 0.

Four power supplies provide full redundancy. If a DC power supply fails, its redundant
power supply takes over without interruption.

Each DC power supply has a single DC input (–48 VDC and return) that requires a
dedicated 80 A (–48 VDC) circuit breaker for the maximum router hardware
configuration. For information about site power preparations and connecting the
router to power and ground, see the MX960 Ethernet Services Router Hardware Guide.

For DC power supply and power system electrical specifications, see Table 1 on page
3 and the MX960 Ethernet Services Router Hardware Guide.

Figure 1: DC Power Supply

DC Power Supply Electrical Specifications

2 ■ DC Power Supply

Table 1 on page 3 lists the DC power supply electrical specifications. For DC power
system electrical specifications, see the MX960 Ethernet Services Router Hardware
Guide.

Table 1: DC Power Supply Electrical Specifications

SpecificationItem

2800 WMaximum output power

DC Power Supply

DC Power Supply LEDs

Each DC power supply faceplate contains three LEDs that indicate the status of the
power supply (see Table 2 on page 3). The power supply status is also reflected in
two LEDs on the craft interface (see the MX960 Ethernet Services Router Hardware
Guide). In addition, a power supply failure triggers the red alarm LED on the craft
interface.

DC input voltage

Protector

Minimum: –40 VDC

Nominal: –48 VDC

Operating range: –40 to –72 VDC

NOTE: If the input voltage from the DC power source drops below

-37.5 to -39.5 VDC, the routing platform automatically shuts down.
During automatic shutdown, the circuit remains active. When the
input voltage returns to –43.0 to –44.00 VDC, the router
automatically starts up again and the system returns to normal
operation within 30 minutes. No operator intervention is required.

70 A maximum @ –48 VDC (nominal operating voltage)DC input current rating

80 AInternal Supplementary

Table 2: DC Power Supply LEDs

PWR OK

BREAKER
ON

INPUT OK

OffGreen

DescriptionStateColorLabel

Power supply is not functioning normally. Check the INPUT OK LED for more
information.

Power supply is functioning normally.On

DC power supply circuit breaker is turned off.OffGreen

DC power supply circuit breaker is turned on.On

DC input to the PEM is not present.OffGreen

DC input is present, and is connected in correct polarity.On

DC input is present, but connected in reverse polarity.OnAmber

DC Power Supply ■ 3

MX960 Ethernet Services Router DC Power Supply Installation Instructions

Replacing a DC Power Supply

To replace a DC power supply, use the following procedures:

■ Removing a DC Power Supply on page 4

■ Installing a DC Power Supply on page 7

Removing a DC Power Supply

The power supplies are located at the rear of the chassis. Each DC power supply
weighs approximately 3.8 lb (1.7 kg).

CAUTION: Do not leave a power supply slot empty for more than 30 minutes while
the router is operational. For proper airflow, the power supply must remain in the
chassis or a blank panel must be used in an empty slot.

NOTE: After powering off a power supply, wait at least 60 seconds before turning it
back on.

To remove a DC power supply, follow this procedure:

1. Make sure that the voltage across the DC power source cable leads is 0 V and

that there is no chance that the cables might become active during the removal
process.

2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and

connect the strap to one of the ESD points on the chassis. For more information
about ESD, see the MX960 Ethernet Services Router Hardware Guide.

3.

Switch the circuit breaker on the power supply faceplate to the OFF position.

4. Remove the clear plastic cover protecting the terminal studs on the faceplate.

5. Remove the nuts and washers from the terminal studs (see Figure 2 on page 5).

(Use a 3/8–in. nut driver or pliers.)

4 ■ Replacing a DC Power Supply

Replacing a DC Power Supply

Figure 2: Disconnecting Power Cables From the DC Power Supply

6. Remove the cable lugs from the terminal studs.

7. Loosen the captive screw on the cable restraint on the lower edge of the power

supply faceplate.

8. Carefully move the power cables out of the way.

9. While grasping the handle on the power supply faceplate with one hand, use

your other hand to pull the spring-loaded locking pin in the release lever away
from the chassis and turn the release lever counterclockwise until it stops (see
Figure 3 on page 6).

10. Let go of the locking pin in the release lever. Ensure that the pin is seated inside

the corresponding hole in the chassis.

11. Pull the power supply straight out of the chassis.

WARNING: Do not touch the power connector on the top of the power supply (see
Figure 4 on page 6). It can contain dangerous voltages.

Replacing a DC Power Supply ■ 5

MX960 Ethernet Services Router DC Power Supply Installation Instructions

Figure 3: Removing a DC Power Supply

Figure 4: Top of the Power Supply Showing Midplane Connector

6 ■ Replacing a DC Power Supply

Installing a DC Power Supply

To install a DC power supply, follow this procedure (see Figure 5 on page 9):

1. Ensure that the voltage across the DC power source cable leads is 0 V and that

there is no chance that the cable leads might become active during installation.

CAUTION: You must ensure that power connections maintain the proper polarity.
The power source cables might be labeled (+) and (–) to indicate their polarity. There
is no standard color coding for DC power cables. The color coding used by the external
DC power source at your site determines the color coding for the leads on the power
cables that attach to the terminal studs on each power supply.

2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and

connect the strap to one of the ESD points on the chassis. For more information
about ESD, see the MX960 Ethernet Services Router Hardware Guide.

Replacing a DC Power Supply

3.

Switch the circuit breaker on the power supply faceplate to the OFF position.

4. Ensure that the release lever below the empty power supply slot is engaged in

the counterclockwise, or unlocked, position (see Figure 5 on page 9).

If necessary, pull the spring-loaded locking pin in the release lever away from
the chassis and turn the release lever counterclockwise until it stops. Let go of
the locking pin in the release lever. Ensure that the pin is seated inside the
corresponding hole in the chassis.

5. Using both hands, slide the power supply straight into the chassis until the power

supply is fully seated in the chassis slot. The power supply faceplate should be
flush with any adjacent power supply faceplates.

The small tab on the metal housing that is controlled by the release lever must
be inside the corresponding slot at the bottom of the power supply (see
Figure 5 on page 9). This tab is used to pull the power supply down in the
chassis slot, before the power supply is removed.

6. While firmly pushing the handle on the power supply faceplate with one hand,

use your other hand to pull the spring-loaded locking pin in the release lever
away from the chassis and turn the release lever clockwise until it stops.

7. Let go of the locking pin in the release lever. Ensure that the pin is seated inside

the corresponding hole in the chassis.

8. Remove the clear plastic cover protecting the terminal studs on the faceplate.

9. Remove the nuts and washers from the terminal studs.

10. Attach the lugs on the DC source power cables to the terminal studs, making

sure the cables are not touching or in the way of any router components (see
Figure 6 on page 10).

Replacing a DC Power Supply ■ 7

MX960 Ethernet Services Router DC Power Supply Installation Instructions

■

Attach the positive (+) DC source power cable lug to the RTN (return)

terminal.

■

Attach the negative (–) DC source power cable lug to the –48V (input)

terminal.

NOTE: The DC power supplies in slots PEM0 and PEM1 must be powered by dedicated
power feeds derived from feed A, and the DC power supplies in slots PEM2 and PEM3
must be powered by dedicated power feeds derived from feed B. This configuration
provides the commonly deployed A/B feed redundancy for the system. For
information about connecting to DC power sources, see the MX960 Ethernet Services
Router Hardware Guide.

11. Secure each power cable lug to the terminal studs, first with the split washer,

then with the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of
torque to each nut.

12. Loosen the captive screw on the cable restraint on the lower edge of the power

supply faceplate.

13. Route the positive and negative DC power cables through the left and right sides

of the cable restraint.

14. Tighten the cable restraint captive screw to hold the power cables in place.

15. Replace the clear plastic cover over the terminal studs on the faceplate.

16. Verify that the ground and power cabling are correct, that they are not touching

or blocking access to router components, and that they do not drape where
people could trip on them.

17.

Switch the circuit breaker on the power supply to the ON position and observe
the status LEDs on the power supply faceplate. If the power supply is correctly
installed and functioning normally, the PWR OK, BREAKER ON, and INPUT OK
LEDs light steadily.

8 ■ Replacing a DC Power Supply

Figure 5: Installing a DC Power Supply

Replacing a DC Power Supply

Replacing a DC Power Supply ■ 9

MX960 Ethernet Services Router DC Power Supply Installation Instructions

Figure 6: Connecting DC Power to the Router

List of Technical Publications

Table 3 on page 10 lists the software and hardware guides and release notes for
Juniper Networks J-series, M-series, MX-series, and T-series routing platforms and
describes the contents of each document. Table 4 on page 15 lists the books included
in the Network Operations Guide series.

Table 5 on page 15 lists additional books on Juniper Networks solutions that you can
order through your bookstore. A complete list of such books is available at

http://www.juniper.net/books.

Table 3: Technical Documentation for Supported Routing Platforms

DescriptionBook

JUNOS Software for Supported Routing Platforms

Access Privilege

Class of Service

Explains how to configure access privileges in user classes by using
permission flags and regular expressions. Lists the permission flags
along with their associated command-line interface (CLI) operational
mode commands and configuration statements.

Provides an overview of the class-of-service (CoS) functions of the
JUNOS software and describes how to configure CoS features,
including configuring multiple forwarding classes for transmitting
packets, defining which packets are placed into each output queue,
scheduling the transmission service level for each queue, and
managing congestion through the random early detection (RED)
algorithm.

10 ■ List of Technical Publications

Table 3: Technical Documentation for Supported Routing Platforms (continued)

DescriptionBook

List of Technical Publications

CLI User Guide

Feature Guide

High Availability

MPLS Applications

Multicast Protocols

Multiplay Solutions

Network Interfaces

Network Management

Describes how to use the JUNOS command-line interface (CLI) to
configure, monitor, and manage Juniper Networks routing
platforms. This material was formerly covered in the JUNOS System
Basics Configuration Guide.

Provides a detailed explanation and configuration examples for
several of the most complex features in the JUNOS software.

Provides an overview of hardware and software resources that
ensure a high level of continuous routing platform operation and
describes how to configure high availability (HA) features such as
nonstop routing (NSR) and graceful Routing Engine switchover
(GRES).

Provides an overview of traffic engineering concepts and describes
how to configure traffic engineering protocols.

Provides an overview of multicast concepts and describes how to
configure multicast routing protocols.

Describes how you can deploy IPTV and voice over IP (VoIP)
services in your network.

Provides an overview of the network interface functions of the
JUNOS software and describes how to configure the network
interfaces on the routing platform.

Provides an overview of network management concepts and
describes how to configure various network management features,
such as SNMP and accounting options.

Policy Framework

Routing Protocols

Secure Configuration Guide for Common Criteria
and JUNOS-FIPS

Services Interfaces

Software Installation and Upgrade Guide

System Basics

Provides an overview of policy concepts and describes how to
configure routing policy, firewall filters, and forwarding options.

Provides an overview of routing concepts and describes how to
configure routing, routing instances, and unicast routing protocols.

Provides an overview of secure Common Criteria and JUNOS-FIPS
protocols for the JUNOS software and describes how to install and
configure secure Common Criteria and JUNOS-FIPS on a routing
platform.

Provides an overview of the services interfaces functions of the
JUNOS software and describes how to configure the services
interfaces on the router.

Describes the JUNOS software components and packaging and
explains how to initially configure, reinstall, and upgrade the JUNOS
system software. This material was formerly covered in the JUNOS
System Basics Configuration Guide.

Describes Juniper Networks routing platforms and explains how
to configure basic system parameters, supported protocols and
software processes, authentication, and a variety of utilities for
managing your router on the network.

List of Technical Publications ■ 11

MX960 Ethernet Services Router DC Power Supply Installation Instructions

Table 3: Technical Documentation for Supported Routing Platforms (continued)

DescriptionBook

VPNs

JUNOS References

Hierarchy and RFC Reference

Interfaces Command Reference

Routing Protocols and Policies Command
Reference

System Basics and Services Command Reference

System Log Messages Reference

Provides an overview and describes how to configure Layer 2 and
Layer 3 virtual private networks (VPNs), virtual private LAN service
(VPLS), and Layer 2 circuits. Provides configuration examples.

Describes the JUNOS configuration mode commands. Provides a
hierarchy reference that displays each level of a configuration
hierarchy, and includes all possible configuration statements that
can be used at that level. This material was formerly covered in
the JUNOS System Basics Configuration Guide.

Describes the JUNOS software operational mode commands you
use to monitor and troubleshoot interfaces.

Describes the JUNOS software operational mode commands you
use to monitor and troubleshoot routing policies and protocols,
including firewall filters.

Describes the JUNOS software operational mode commands you
use to monitor and troubleshoot system basics, including
commands for real-time monitoring and route (or path) tracing,
system software management, and chassis management. Also
describes commands for monitoring and troubleshooting services
such as class of service (CoS), IP Security (IPSec), stateful firewalls,
flow collection, and flow monitoring.

Describes how to access and interpret system log messages
generated by JUNOS software modules and provides a reference
page for each message.

J-Web User Guide

J-Web Interface User Guide

JUNOS API and Scripting Documentation

JUNOScript API Guide

JUNOS XML API Configuration Reference

JUNOS XML API Operational Reference

NETCONF API Guide

Describes how to use the J-Web graphical user interface (GUI) to
configure, monitor, and manage Juniper Networks routing
platforms.

Describes how to use the JUNOScript application programming
interface (API) to monitor and configure Juniper Networks routing
platforms.

Provides reference pages for the configuration tag elements in the
JUNOS XML API.

Provides reference pages for the operational tag elements in the
JUNOS XML API.

Describes how to use the NETCONF API to monitor and configure
Juniper Networks routing platforms.

12 ■ List of Technical Publications

Table 3: Technical Documentation for Supported Routing Platforms (continued)

DescriptionBook

List of Technical Publications

JUNOS Configuration and Diagnostic Automation
Guide

JUNOS Enhanced Services Documentation

Getting Started Guide

Interfaces and Routing Guide

Security Configuration Guide

Administration Guide

Describes how to use the commit script and self-diagnosis features
of the JUNOS software. This guide explains how to enforce custom
configuration rules defined in scripts, how to use commit script
macros to provide simplified aliases for frequently used
configuration statements, and how to configure diagnostic event
policies.

Provides an overview, basic instructions, and specifications for
J-series Services Routers. The guide explains how to prepare your
site for installation, unpack and install the router and its
components, install licenses, and establish basic connectivity. Use
the Getting Started Guide for JUNOS Enhanced Services.

Explains how to configure the interfaces on J-series Services Routers
running JUNOS Enhanced Services for basic IP routing with standard
routing protocols, ISDN backup, digital subscriber line (DSL)
connections, and class-of-service (CoS) classification for safer, more
efficient routing.

Explains how to configure J-series Services Routers running JUNOS
Enhanced Services in virtual private networks (VPNs) and multicast
networks; configure firewall NAT and ALGs; apply routing
techniques such as zones, policies, stateful firewall filters, and IP
Security (IPSec) tunnels; and configure screens and firewall
authentication

Shows how to manage users and operations, monitor network
performance, upgrade software, change routing and secure
contexts, and diagnose common problems on J-series Services
Routers running JUNOS Enhanced Services.

Design and Implementation Guide

Migration Guide

Hardware Documentation

Hardware Guide

PIC Guide

DPC Guide

JUNOScope Documentation

Provides guidelines and examples for designing and implementing
IP Security (IPSec) VPNs, firewalls, and routing on J-series routers
running JUNOS software with Enhanced Services.

Provides instructions for migrating an SSG 300M-series or SSG
500M-series security device running ScreenOS software or a J-series
router running JUNOS software to JUNOS Enhanced Services.

Describes how to install, maintain, and troubleshoot routing
platforms and components. Each platform has its own hardware
guide.

Describes the routing platform's Physical Interface Cards (PICs).
Each platform has its own PIC guide.

Describes the Dense Port Concentrators (DPCs) for all MX-series
routers.

List of Technical Publications ■ 13

MX960 Ethernet Services Router DC Power Supply Installation Instructions

Table 3: Technical Documentation for Supported Routing Platforms (continued)

DescriptionBook

JUNOScope Software User Guide

Advanced Insight Solutions (AIS) Documentation

AIS Operations Guide

J-series Routing Platform Documentation

Getting Started Guide

Basic LAN and WAN Access Configuration Guide

Advanced WAN Access Configuration Guide

Administration Guide

Describes the JUNOScope software graphical user interface (GUI),
how to install and administer the software, and how to use the
software to manage routing platform configuration files and monitor
routing platform operations.

Provides an overview, basic instructions, and specifications for
J-series routing platforms. The guide explains how to prepare your
site for installation, unpack and install the router and its
components, install licenses, and establish basic connectivity. Use
the Getting Started Guide for your router model.

Explains how to configure the interfaces on J-series Services Routers
for basic IP routing with standard routing protocols, ISDN backup,
and digital subscriber line (DSL) connections.

Explains how to configure J-series Services Routers in virtual private
networks (VPNs) and multicast networks, configure data link
switching (DLSw) services, and apply routing techniques such as
policies, stateless and stateful firewall filters, IP Security (IPSec)
tunnels, and class-of-service (CoS) classification for safer, more
efficient routing.

Shows how to manage users and operations, monitor network
performance, upgrade software, and diagnose common problems
on J-series Services Routers.

Release Notes

JUNOS Release Notes

Hardware Release Notes

JUNOScope Release Notes

AIS Operations Release Notes

AIS ai-script Release Notes

J-series Services Router Release Notes

Summarize new features and known problems for a particular
software release, provide corrections and updates to published
JUNOS, JUNOScript, and NETCONF manuals, provide information
that might have been omitted from the manuals, and describe
upgrade and downgrade procedures.

Describe the available documentation for the routing platform and
summarize known problems with the hardware and accompanying
software. Each platform has its own release notes.

Contain corrections and updates to the published JUNOScope
manual, provide information that might have been omitted from
the manual, and describe upgrade and downgrade procedures.

Briefly describe Services Router features, identify known hardware
problems, and provide upgrade and downgrade instructions.

14 ■ List of Technical Publications

Table 3: Technical Documentation for Supported Routing Platforms (continued)

DescriptionBook

List of Technical Publications

JUNOS Enhanced Services Release Notes

Summarize new features for a particular release, identify known
hardware and software problems, provide information that might
have been omitted from the manuals, and provide upgrade and
downgrade instructions.

Table 4: JUNOS Software Network Operations Guides

DescriptionBook

Baseline

Interfaces

MPLS

MPLS Log Reference

Describes the most basic tasks for running a network using Juniper
Networks products. Tasks include upgrading and reinstalling JUNOS
software, gathering basic system management information,
verifying your network topology, and searching log messages.

Describes tasks for monitoring interfaces. Tasks include using
loopback testing and locating alarms.

Describes tasks for configuring, monitoring, and troubleshooting
an example MPLS network. Tasks include verifying the correct
configuration of the MPLS and RSVP protocols, displaying the status
and statistics of MPLS running on all routing platforms in the
network, and using the layered MPLS troubleshooting model to
investigate problems with an MPLS network.

Describes MPLS status and error messages that appear in the output
of the show mpls lsp extensive command. The guide also describes
how and when to configure Constrained Shortest Path First (CSPF)
and RSVP trace options, and how to examine a CSPF or RSVP
failure in a sample network.

MPLS Fast Reroute

Hardware

Describes operational information helpful in monitoring and
troubleshooting an MPLS network configured with fast reroute
(FRR) and load balancing.

Describes tasks for monitoring M-series and T-series routing
platforms.

Table 5: Additional Books Available Through http://www.juniper.net/books

DescriptionBook

Interdomain Multicast
Routing

JUNOS Cookbook

Provides background and in-depth analysis of multicast routing using Protocol Independent
Multicast sparse mode (PIM SM) and Multicast Source Discovery Protocol (MSDP); details
any-source and source-specific multicast delivery models; explores multiprotocol BGP (MBGP)
and multicast IS-IS; explains Internet Gateway Management Protocol (IGMP) versions 1, 2, and
3; lists packet formats for IGMP, PIM, and MSDP; and provides a complete glossary of multicast
terms.

Provides detailed examples of common JUNOS software configuration tasks, such as basic
router configuration and file management, security and access control, logging, routing policy,
firewalls, routing protocols, MPLS, and VPNs.

List of Technical Publications ■ 15

MX960 Ethernet Services Router DC Power Supply Installation Instructions

Table 5: Additional Books Available Through http://www.juniper.net/books (continued)

DescriptionBook

MPLS-Enabled Applications

OSPF and IS-IS: Choosing an
IGP for Large-Scale Networks

Routing Policy and Protocols
for Multivendor IP Networks

The Complete IS-IS Protocol

Requesting Support

Provides an overview of Multiprotocol Label Switching (MPLS) applications (such as Layer 3
virtual private networks [VPNs], Layer 2 VPNs, virtual private LAN service [VPLS], and
pseudowires), explains how to apply MPLS, examines the scaling requirements of equipment
at different points in the network, and covers the following topics: point-to-multipoint label
switched paths (LSPs), DiffServ-aware traffic engineering, class of service, interdomain traffic
engineering, path computation, route target filtering, multicast support for Layer 3 VPNs, and
management and troubleshooting of MPLS networks.

Explores the full range of characteristics and capabilities for the two major link-state routing
protocols: Open Shortest Path First (OSPF) and IS-IS. Explains architecture, packet types, and
addressing; demonstrates how to improve scalability; shows how to design large-scale networks
for maximum security and reliability; details protocol extensions for MPLS-based traffic
engineering, IPv6, and multitopology routing; and covers troubleshooting for OSPF and IS-IS
networks.

Provides a brief history of the Internet, explains IP addressing and routing (Routing Information
Protocol [RIP], OSPF, IS-IS, and Border Gateway Protocol [BGP]), explores ISP peering and
routing policies, and displays configurations for both Juniper Networks and other vendors'
routers.

Provides the insight and practical solutions necessary to understand the IS-IS protocol and how
it works by using a multivendor, real-world approach.

For technical support, open a support case with the Case Manager link at

http://www.juniper.net/support/ or call 1-888-314-JTAC (from the United States, Canada,

or Mexico) or 1-408-745-9500 (from elsewhere).

Revision History

19 October 2007—530-017577-01 Revision 2. Corrected the DPC slot range supported
by power supplies PEM0 and PEM2.

12 March 2007—530-017577-01 Revision 1.

Copyright © 2007, Juniper Networks, Inc. All rights reserved.

Juniper Networks, the Juniper Networks logo, NetScreen, and ScreenOS are registered trademarks of Juniper Networks, Inc. in the United States and other
countries. JUNOS and JUNOSe are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, 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.

Products made or sold by Juniper Networks or components thereof might be covered by one or more of the following patents that are owned by or licensed
to Juniper Networks: U.S. Patent Nos. 5,473,599, 5,905,725, 5,909,440, 6,192,051, 6,333,650, 6,359,479, 6,406,312, 6,429,706, 6,459,579, 6,493,347,
6,538,518, 6,538,899, 6,552,918, 6,567,902, 6,578,186, and 6,590,785.

16 ■ Requesting Support