Cisco 3600 Series Upgrade Instructions

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Upgrading System Memory in Cisco 3700 Series Routers
OL-5423-02
Upgrading System Memory in Cisco 3725 Routers
Figure 1 Removing the Cover from a Cisco 3725 Router
Step 8
When you are ready to replace the cover, see the “Replacing the Cisco 3725 Cover” section on page 16.
Replacing Cisco 3725 SDRAM
SDRAM DIMM Location and Orientation
Figure 2 shows the location of dynamic memory—SDRAM DIMM sockets 0 and 1—in a Cisco 3725
router.
DIMMs are manufactured with polarization notches to ensure proper orientation, and alignment holes to
ensure proper positioning. Figure 3 shows the polarization notches and alignment holes on a DIMM.
SDRAM DIMMs are installed with the connector edge down and the polarization notches toward the left
side of the chassis.
Caution To avoid damaging ESD-sensitive components, observe all ESD precautions. To avoid damaging the
underlying mainboard, do not use excessive force when you remove or replace DIMMs.
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Cisco 3600 Series Specifications

General

Operating System	Cisco IOS
Series	3600
Type	Modular Router
Interfaces	Ethernet, Fast Ethernet, Serial, ISDN
Routing Protocols	RIP, OSPF, EIGRP, BGP, IS-IS
Redundancy	Optional redundant power supply
Management	CLI, SNMP, Telnet
Weight	Varies depending on the specific model
Power Supply	AC or DC, optional redundant power supply