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Hardware Installation Guide for the Cisco 4000 Series Integrated Services Router
OL-32185-02
Chapter 1 Overview of Cisco 4000 Series ISRs
Hardware Features of Cisco 4000 Series ISRs
System Flash
Depending on the model that you have purchased, the routers use a CompactFlash or an eUSB flash for
the internal bootflash memory. The CompactFlash and eUSB flash stores the operating system software
image.
The CompactFlash is applicable only to Cisco 4451-X ISR. Each model supports 1 internal
CompactFlash 8-GB, 16-GB, or 32-GB memory card. The CompactFlash is located behind the fan tray
on the router chassis.
Cisco 4431 ISRs have a eMMC flash device. The device supports 8GB, 16GB, or 32 GB.
Cisco 4300 Series ISRs have an onboard flash device or a eMMC flash device. It supports 8GB or 16GB.
Note For Cisco 4451-X ISR, you must use Cisco-qualified CompactFlash cards. Use of any other cards during
normal network operation can affect system performance or reliability.
Note Do not run the router without a CompactFlash card installed. Cisco IOS XE software does not boot
without a flash card in the router.
Solid State Drives
The NIM slots in the router support a field-replaceable solid state drive module with a dual-SSD SATA
slot. The NIM can be installed in any bay slot 0. The SSDs are hot-swappable as part of normal
operation. See the “Locate Internal and External Slots for Modules on Cisco 4331 ISR” section on
page 6-9 section for more information.
Cisco 4300 ISR platforms support optional internal SSD mSATA. This device is not hot-swappable and
requires opening the chassis to service or upgrade.
Packet Voice Digital Signal Processor Modules
The Packet Voice Digital Signal Processor Modules (PVDM4s) add additional voice capabilities to the
routers. The PVDM4 is installed inside the chassis of the router. See the “Install PVDM4 on the
Motherboard of Cisco 4400 Series ISRs” section on page 6-33 for installation instructions.
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