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Hardware Installation Guide for the Cisco 4451-X Integrated Services Router
OL-27644-01
Chapter 6 Installing and Upgrading Internal Modules and FRUs
Installing and Removing DDR DIMMs
Installing a DIMM
Note Unregistered DIMMS (UDIMMs) and very low profile (VLP) RDIMMs are not interchangeable.
Follow these steps to install a DIMM:
Step 1 Read the “Safety Warnings” section on page 6-2 section and disconnect the power supply before you
perform any module replacement.
Step 2 Remove the chassis cover. For the Cisco ISR 4451-Xs, see the “Removing and Replacing the Chassis
Cover” section on page 6-4.
Step 3 Locate the DIMM module. See the “Locating Internal and External Slots for Modules” section on
page 6-5 to find the DIMM sockets on the router.
Step 4 Make sure that both latches on the DIMM connector are in the open position.
Step 5 Orient the DIMM so that the polarization notch lines up with the polarization key on the connector. See
Figure 6-16.
Caution DIMMs and PVDM4s plug into similarly sized sockets. Only the polarization notch differs. Look for the
polarization notch shown in Figure 6-16 before inserting a DIMM in the socket.
Figure 6-16 DIMM Showing Polarization Notch
Step 6
Insert the DIMM into the connector one side at a time. Figure 6-17 shows what not to do while handling
a DIMM.
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