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Hardware Installation Guide for the Cisco 4451-X Integrated Services Router
OL-27644-01
Chapter 1 Overview of the Cisco 4451-X Integrated Services Router
Hardware Features
Packet Voice Digital Signal Processor Modules
The Packet Voice Digital Signal Processor Modules (PVDM4s) add additional voice capabilities to the
Cisco ISR 4451-Xs. The PVDM4 is installed inside the chassis of the router. See the “Installing the
PVDM4 on the Motherboard of the Cisco ISR 4451-X” section on page 6-27 for installation instructions.
Memory
Cisco ISR 4451-X routers contain the following types of memory:
• Control and data plane DIMMs—Stores the running configuration and routing tables and is used for
packet buffering by the network interfaces. Cisco IOS XE software executes from memory.
Supported module types are Dual In-Line Memory Modules (DIMMs).
Note The DIMMs are interchangeable although the same sizes are not supported in all locations. The
single data plane DIMM must have a 2GB DIMM which is exactly like one of the two DIMMs
used for the control plane with 4GB default memory. The control plane uses two DIMMs and
they must be exactly the same type and density.
• Boot/NVRAM—Stores the bootstrap program (ROM monitor), the configuration register, and the
startup configuration.
• Flash memory—Internal bootflash memory. Stores the operating system software image. Each
model supports 1 internal Compact Flash 8GB, 15GB or 32 GB memory card. The compact flash is
located behind the fan tray on the router chassis.
Note You must use Cisco-qualified CompactFlash cards. Use of any other cards during normal
network operation can affect system performance.
Power Supplies
Cisco ISR 4451-Xs support a variety of power supply configurations. All power supplies are
field-replaceable and externally accessible.
If configured with dual power supplies or a PoE adaptor, the power supplies are hot-swappable. There is
an option for a second power supply unit.
Configurations include AC, internal PoE, and PoE boost. Table 1-3 summarizes the power options.
Table 1-3 Cisco ISR 4451-X Field Replaceable Unit Power Options
Router Model AC Hot Swap
1
1. Must have PoE boost installed.
Additional AC Power Internal PoE Internal PoE Boost
Cisco ISR 4451
-X
XX X X