Chapter 1 System Overview; System Description; Field-Replaceable Units (Frus) - Juniper M10i Hardware Manual

Chapter 1
System Overview

System Description

Field-Replaceable Units (FRUs)

This chapter provides an overview of the Juniper Networks M10i Internet router,
discussing the following topics:
System Description on page 3
Field-Replaceable Units (FRUs)
on page 4
System Redundancy
Safety Requirements, Warnings, and Guidelines
The M10i Internet router provides high-speed interfaces for medium and large
networks and network applications, such as those supported by Internet service
providers (ISPs). Application-specific integrated circuits (ASICs), a definitive part of
the router design, enable the router to forward data at the high speeds demanded
by current network media.
The M10i router supports up to eight Physical Interface Cards (PICs). The router
height of 8.7 in. (22.1 cm) enables stacked installation of eight M10i routers in a
single floor-to-ceiling rack, for increased port density per unit of floor space.
The router's maximum aggregate throughput is 3.2 gigabits per second (Gbps) full
duplex per FPC (6.4 Gbps full-duplex total throughput rate). Inserting a combination
of PICs with an aggregate higher than the maximum throughput per FPC is supported,
but constitutes oversubscription of the FPC.
The router architecture cleanly separates control operations from packet forwarding
operations, which helps to eliminate processing and traffic bottlenecks. Control
operations in the router are performed by the Routing Engine, which runs JUNOS
Internet software to handle routing protocols, traffic engineering, policy, policing,
monitoring, and configuration management. Forwarding operations in the router
are performed by the Packet Forwarding Engine, which consists of hardware, including
ASICs, designed by Juniper Networks.
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:
on page 3
on page 5
3
System Description