Specifications

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2.4 The M160 Hardware System
The M160 Internet Backbone Router is a complete routing system that provides
SDH/SONET, ATM, Gigabit Ethernet, and other high-speed interfaces for 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 system design, enable the router to achieve data forwarding rates
that match current fiber-optic capacity. The router accommodates up to eight
Flexible PIC Concentrators (FPCs), which can each be configured with a variety
of network media types—altogether providing up to 32 OC-12, 32 OC-48, or 8
OC-192 ports per system.
The router’s maximum aggregate throughput is 160 Gbps. The router can forward
traffic at line rate for any combination of PICs that does not exceed 12.8 Gbps on
a single FPC. Any combination exceeding 12.8 Gbps is supported, but constitutes
oversubscription. The router architecture cleanly separates control operations
from packet forwarding operations. This design eliminates processing and traffic
bottlenecks, permitting the router to achieve full line-rate performance. 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.
The router is a modular, rack-mountable system. Its size allows two routers to be
installed in one standard, 78-in.-high Telco rack.
Component Replaceability
The router’s major hardware components are field replaceable, including:
§ Switching and Forwarding Modules (SFMs)
§ Flexible PIC Concentrators (FPCs)
§ Physical Interface Cards (PICs)
§ PFE Clock Generators (PCGs)
§ Routing Engine
§ Miscellaneous Control Subsystem (MCS)
§ Front impeller assembly with craft interface
§ Rear upper impeller assembly
§ Rear lower impeller assembly
§ Fan tray with cable management system
§ Connector Interface Panel (CIP)
§ Power supplies
§ Air filter
There are two types of field-replaceable components: