Juniper M5, M10 Quick Reference

M5 and M10 Internet Backbone Routers

Forwarding
Engine

Routing Engine
cover

Board

1300

Craft interface

PICs

ESD

point

Power
supplies

ESD
point

Fan tray

Front View Rear View

M5 and M10 Routers Major Hardware Components

Component Quantity Function Redundant Field-replaceable Button

Forwarding Engine 1 Connects PICs to router components, – Requires router –
Board (FEB) houses shared memory shutdown

Physical Interface Cards 1–4
(PICs) 1–8

Routing Engine 1 Handles routing protocols, maintains – Requires router –

Power supplies 2 AC or Distributes voltages to components Yes Hot-removable –

Cooling system 1 fan tray Cools router components Yes Hot-removable –

Craft interface 1 Displays status and allows you to take – – –

Hot-removable and hot-insertable—Can remove and replace without powering down the router or disrupting routing functions.
Hot-pluggable—Can remove without powering down the router, but the routing and forwarding functions are interrupted until the replacement

component is installed.

M5 router
M10 router

2 DC Hot-insertable

(3 fans) Hot-insertable

Provides interfaces to various network media – Hot-removable Yes

Hot-insertable

routing tables shutdown

PICs offline

Offline

1302

M5 and M10 Routers Physical Specifications

Dimensions 5.25 in. (13.3 cm) high x 17.4 in. (44.2 cm) wide x 24 in. (61 cm) deep
Weight 57 lb (25.8 kg) minimum configuration

Required clearances 24 in. (61 cm) front and rear; 6 in. (15.2 cm) each side

Hardware JUNOS Release 4.3

61 lb (27.6 kg) maximum configuration,
65 lb (29.5 kg) maximum configuration,

M5 router
M10 router

M5 and M10 Internet Backbone Routers

M5 and M10 Routers Power Supply Specifications

Specification AC DC

Maximum power consumption 434 W 434 W
Input voltage 100 through 264 VAC operating range –42.5 through –72 VDC operating range
Input line frequency 47 through 63 Hz, autoranging –
Input current rating 8 A @ 100 VAC; 4 A @ 240 VAC 13.5 A @ –48 VDC (typical)
Output voltages +1.5 V; +2.5 V; +3.3 V; +5 V; +12 V +1.5 V; +2.5 V; +3.3 V; +5 V; +12 V
Power and grounding cords and cables Country-specific; see M5 and M10 Internet 12 AWG wire cables attaching to

M5 and M10 Routers LEDs

Component LED Location

PICs 1 LED per port, with 4 states: Red, Green, Amber, Off PIC faceplate
Power supplies Blue OUTPUT OK Power supply faceplate

Alarm LEDs

Red alarm Large circular red Craft interface
Yellow alarm Large triangular amber Craft interface

Red alarms occur when the router is started if no device is physically connected to the management fxp0 interface or if two power supplies are
physically installed but only one is switched on.

Backbone Router Hardware Installation Guide quick-connect terminals; grounding

cable attaches to single-hole cable lug

Taking Components Offline

Component Procedure

PIC 1. Press the PIC offline button, located on the PIC faceplate.

2. Press and hold the button until the PIC LED lights red (about 5 seconds).

3. Press and hold the offline button again after installing the replacement PIC to bring the PIC online.

M5 and M10 Internet Backbone Routers

JUNOS

software

System

management

processes

Routing

protocols

Control

functions

System processes

Operating system

Kernel

Intel-based PCI platform

1164

System Architecture

The router has two major architectural components: The Routing
Engine, which provides Layer 3 routing services and network
management; and the Packet Forwarding Engine, which provides
packet switching, route lookups, and packet forwarding. The
Routing Engine and Packet Forwarding Engine operate
independently, but constantly communicate through a 100-Mbps
link, as illustrated in the figure at the right.

Packet Flow through the
Packet Forwarding Engine

To ensure efficient packet flow through
the system, data packet forwarding is
handled by ASICs on the hardware
components. The figure at the right
shows the sequence of packet flow
through the Packet Forwarding Engine.

Packet

in

Packet

out

Controller

Controller

= ASIC

PIC

PIC

Packets

in

Midplane

I/O

Manager

Routing Engine

100-Mbps link

Packet Forwarding

Engine

FEB

Distributed

Buffer

Manager

Distributed

Buffer

Manager

Internet

Processor

II

Packets

out

1244

Routing

Engine

1335

Routing Engine Architecture

The Routing Engine handles all the routing protocol
processes as well as processes controlling
interfaces, router components, system
management, and user access. These processes run
on top of a kernel that interacts with the Packet
Forwarding Engine.

Control Packet Handling

The Routing Engine constructs and maintains routing
tables, and derives a table of active routes, called the
forwarding table, from the routing tables. The forwarding
table is then copied into the Packet Forwarding Engine.

Forwarding table
updates

Packets

in

Routing protocol

process

Routing Engine

Forwarding table

Packet Forwarding

Engine

Routing protocol
packets from network

Packets

out

1240

M5 and M10 Internet Backbone Routers

General Safety Guidelines

■ Only trained and qualified personnel should install or replace the router.

■ Perform only the procedures described in the M5 and M10 Internet Backbone Routers Hardware Installation

Guide. Other services should be performed by authorized service personnel only.

■ For protection against shock hazard, verify that all power cables are disconnected before servicing the

router.

■ Before installing the router, read the guidelines in the “Prepare the Site” section of the M5 and M10 Internet

Backbone Routers Hardware Installation Guide to make sure that the site meets power, environmental, and

clearance requirements for the router.

■ Manually installing the router requires two people to lift the chassis and a third person to secure the

mounting screws. To prevent injury, keep your back straight and lift with your legs, not your back. Do not
attempt to lift the chassis with the handles on the power supplies.

■ Do not work on the router or connect or disconnect cables during electrical storms.

■ Never install electrical jacks in wet locations unless the jacks are specifically designed for wet

environments.

■ Operate the router only when the grounding wire is connected.

■ Use copper conductors only.

■ Avoid touching uninsulated electrical wires or terminals that have not been disconnected from their power

source. Doing so could cause electrical shock.

■ Do not open or remove chassis covers or sheet metal parts when instructions are not provided in the

M5 and M10 Internet Backbone Routers Hardware Installation Guide. Doing so could cause severe electrical
shock.

■ Do not push or force any objects through any of the openings in the chassis frame. Doing so could result

in electrical shock or fire.

■ Avoid spilling liquid into the router chassis or onto any router components. Doing so could cause electrical

shock or damage the router.

■ Before working on equipment that is connected to power lines, remove jewelry, including rings, necklaces,

and watches. Metal objects heat up when connected to power and ground and can cause serious burns or
weld the metal object to the terminals.

■ Failure to observe these safety warnings could result in serious physical injury.

Agency Approvals

Category Approval

Safety

EMI

Immunity

NEBS Designed to meet the following standards:

ETSI ■ ETS-300386-2 Switching Equipment

www.juniper.net

Juniper Networks is a registered trademark of Juniper Networks, Inc. Internet Processor, Internet Processor II, JUNOS, JUNOScript, M5, M10, M20, M40, and M160
are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks may be the property of their
respective owners. All specifications are subject to change without notice. Copyright © 2001, Juniper Networks, Inc. All rights reserved. Printed in USA.

■ CSA C22.2 No. 950

■ UL 1950

■ EN 60950, Safety of Information Technology Equipment

■ EN 60825-1 Safety of Laser Products–Part 1: Equipment Classification, Requirements and User’s Guide

■ EN 60825-2 Safety of Laser Products–Part 2: Safety of Optical Fibre Communication Systems

■ AS 3548 Class A (Australia)

■ EN 55022 Class A emissions (Europe)

■ FCC Class A (USA)

■ VCCI Class A (Japan)

■ EN 61000-3-2 Power Line Harmonics

■ EN 61000-4-2 ESD

■ EN 61000-4-3 Radiated Immunity

■ EN 61000-4-4 EFT

■ EN 61000-4-5 Surge

■ EN 61000-4-6 Low Frequency Common Immunity

■ EN 61000-4-11 Voltage Dips and Sags

■ GR-63-Core: NEBS, Physical Protection

■ GR-1089-Core: EMC and Electrical Safety for Network Telecommunications Equipment

■ SR-3580 NEBS Criteria Levels (Level 3 Compliance)

For support issues, contact the Juniper Networks Technical Assistance Center (JTAC) at 1-888-314-JTAC
(within the United States) or 408-745-2121 (from outside the United States). For other contact
information, refer to www.juniper.net/contactus.html.