Hardware Component Overview
For further safety information, see “Safety and Regulatory Compliance Inform ation”
on page 221.
Table5 summarizes physical specifications for the router chassis.
Table 5: Chassis Physical Specifications
Description Value
Chassis height 35in. (89 cm)
Chassis width 17.5 in. (44.5 cm) for sides ofchass is
19 in. (48.3 cm) with front support posts an d center-mounting brackets
Chassisdepth 29 in. (73.6 cm)
Weig ht,
maximum
configuration
370.5 lb (168 kg)
Weig ht,
minimum
configuration
190 lb (86 kg)
Thermal output 9400 BTU/hour
Packet Forwarding Engine
The Packet Forwarding Engine is a multicomponent system that uses
application-specific integratedcircuits (ASICs) to perform Layer 2 and Layer3
packet switching,route lookups, and packet forwarding. The ASICs include the
Distributed Buffer Manager ASIC,Internet Processor II ASIC, I/O Manager ASIC,
PacketDirector ASIC, and media-specific controller ASICs.
ThePacketForwardingEnginehasthefollowingcomponents:
Midplane—Physically separates front and rear cavities insi de the chassis,
distributes powerfrom the power supplies, and transfers packetsand signals
between router components, which plug into it.
PhysicalInterface Card (PIC)—Physically connects the router to network media
such as OC-12/STM-4, OC-48/STM-16,Ethernet, and channelized interfaces.
PICs are housed in FlexiblePIC Concentrators (FPCs). (Quad-wide PICs, such
as the OC-192/STM-64 SONET/SDH PIC, are exceptions. Such PICs occupy
Packet Forwarding Engine 11