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5-6 Cisco 4000 Series Hardware Installation and Maintenance
Memory Replacement Procedures
Figure 5-4
Network Processor Module Locations
Memory Replacement Procedures
There are two dynamic random-access memory (DRAM) systems in Cisco 4000 series routers. One
is the shared memory, which is the interface that the network processor modules send data to or
transmit data from, and the other is the primary or main memory, which is reserved for the CPU. In
addition, the Cisco 4000-M has Flash memory for storing the system software image; the
Cisco 4500-M and Cisco 4700 have Flash memory for the system software image and for the boot
helper image.
Caution
To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid
damaging the underlying system card, avoid using excessive force when you remove or replace
SIMMs.
The Cisco 4000-M main memory upgrade requires replacing the main memory configuration of
4 MB (one 4–MB SIMM) with one 8, 16, or 32–MB SIMM. The Cisco 4500-M main memory
upgrade requires replacing the main memory configuration of 8 MB (two 4-MB SIMMs) with two
8-MB SIMMs or two 16–MB SIMMs. The Cisco 4700 main memory upgrade requires replacing the
main memory configuration of 16 MB (two 8-MB SIMMs) with two 16-MB SIMMs.
For the Cisco 4000-M shared memory upgrade, replace the 4–MB shared memory SIMM with a
16–MB shared memory SIMM. The Cisco 4500-M and Cisco 4700 shared memory upgrade permits
you to replace the 4–MB shared memory SIMM with an 8–MB SIMM or a 16–MB SIMM.
H1048a
Female module
connector on the
motherboard
Male module
connector
(cutaway view)
Chassis
wall
Safety latch
Module mounting
screw
Module handles
Summary of Contents for Explorer 4700
Page 18: ...xviii Cisco 4000 Series Hardware Installation and Maintenance Document Conventions ...
Page 116: ...Cable Specifications 2 Book Title 78 xxxxx xx ...
Page 132: ...D 6 Cisco 4000 Series Hardware Installation and Maintenance Entering the ROM Monitor Program ...
Page 134: ...E 2 Cisco 4000 Series Hardware Installation and Maintenance For United Kingdom Use Only ...
Page 136: ...F 2 Cisco 4000 Series Hardware Installation and Maintenance For European Community Use Only ...