Installing And Removing Dram Dimms; Locating And Orienting Dram Dimm - Cisco 2900 Series Installation Manual

Chapter 5 Installing and Upgrading Internal Modules and FRUs

Installing and Removing DRAM DIMMs

Remove the chassis cover or remove the SPE as described in the
on page
Caution Always wear an ESD-preventive wrist strap and ensure that it makes good contact with your skin when
you remove or install DIMMs. Connect the equipment end of the wrist strap to the metal part of the
chassis.
Handle DRAM DIMMs by the edges only. DIMMs are ESD-sensitive components and can be damaged
Caution
by mishandling.

Locating and Orienting DRAM DIMM

Cisco 2901, 2911, and 2921 routers have a single DRAM DIMM socket on the system board. Cisco 2951
and Cisco 3900 series have two DRAM DIMM sockets on the system board that are identified as
DIMM 0 and DIMM 1. See the
connectors on the router.
DRAM DIMMs have a polarization notch on the mating edge to prevent incorrect insertion.
shows the polarization notch on a DRAM DIMM.
DIMMs and PVDM3s plug into similarly sized sockets. Only the polarization notch differs. Look for the
Caution
polarization notch shown in
Figure 5-8
1
5-4.
Figure 5-8
DRAM DIMM Showing Polarization Notch
Polarization notch
"Locating Internal Modules" section on page 5-7
before inserting a DRAM DIMM in the socket.
1
Cisco 2900 Series and 3900 Series Hardware Installation Guide
Installing and Removing DRAM DIMMs
"Accessing Internal Modules" section
to find DIMM
Figure 5-8
5-13