Memory Replacement Procedures - Cisco EF4116 Hardware Installation And Maintenance Manual

Memory Replacement Procedures

Figure 5-4
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
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.
5-6 Cisco 4000 Series Hardware Installation and Maintenance
Network Processor Module Locations
Safety latch
To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid
Module handles
Module mounting
screw
Male module
connector
(cutaway view)
Chassis
wall
Female module
connector on the
motherboard