6-18
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
Replacing the NIM-SSD on the Router
To replace the NIM-SSD on the Cisco ISR 4451-X, follow these steps:
Step 1
Align the NIM-SSD carrier card to the router base.
Step 2
With two hands, slide it back into its slot in the Cisco ISR 4451-X.
Step 3
Tighten the captive screws as shown in
Figure 6-13
.
Installing and Removing DDR DIMMs
To access the DIMMs, you must remove the chassis cover as described in the
“Accessing Internal
Modules” section on page 6-4
.
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.
Caution
Handle DIMMs by the edges only. DIMMs are ESD-sensitive components and can be damaged by
mishandling.
Locating and Orienting DIMM
The Cisco ISR 4451-Xs have three DIMM sockets on the system board: two for the control plane CPU,
and one for the data plane CPU. See the
“Locating Internal and External Slots for Modules” section on
page 6-5
to find DIMM connectors on the router.
DIMMs have a polarization notch on the mating edge to prevent incorrect insertion.
Figure 6-14
shows
the polarization notch on a DIMM.
Caution
DIMMs and PVDM4s plug into similarly sized sockets. Only the polarization notch differs. Look for the
polarization notch shown in
Figure 6-14
before inserting a DIMM in the socket.
