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Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter1 Ov erview and Parts Installation
Hardware Overview
Rear View
Figure1-3 Cisco 7401ASR Router—Rear View
The rear of the Cisco 7401ASR router has five fan airflow vents and the chassis grounding connector
that provides a chassis ground connection for ESD equipment or a two -hole gro und ing lu g. (Se e
Figure 1-3.)
Five internal fans draw cooling air into the chassis and across internal components to maintain an
acceptable operating temperature. (See Figure1-3.) The five fans are located at the rear of the chassis.
System Board
Internally, the system board contains the following components:
•SDRAM memory that is available in three options: 128, 256, or 512 MB DIMM
•Processors
–
Reduced instruction set computing (RISC) RM7000 microprocessor that operates at an internal
clock speed of 375 MHz. The RM7000 processor maintains and executes the system
management functions for the Cisco 7401ASR router. The processor also performs some
memory and environmental monitoring functions.
–
The Parallel eXpress Forwarding (PXF) processor enables parallel IP multipacket processing
functions, working with the Route Processor to provide accelerated packet switching, as we ll as
accelerated IP Layer 3 feature processing.
•System controller
The system controller provides hardware logic to intercon nect the p rocess ors, SDRA M, and the PCI
buses. The Cisco 7401ASR router has one system controller that provides pr ocesso r a cce ss to the
two PCI buses. The system controller also allows the port adapter access to SDRAM.
•Cache memory
The processor has three levels of cache: primary and secondary cache that are internal to the
microprocessor with secondary unified cache for data and instructi on, a nd tert iar y, 2-MB external
cache.
•Two environmental sensors for monitoring the internal temperature of the chassis
•Boot ROM for storing sufficient code for booting the Cisco IOS software
1Fan vent 2Grounding connector
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