Cisco Systems ISR4451XK9 Packet Voice Digital Signal Processor Modules, Memory, Power Supplies

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 6-27for 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 1-3summarizes the power options.

Table 1-3	Cisco ISR 4451-X Field Replaceable Unit Power Options
Router Model		AC	Hot Swap1	Additional AC Power	Internal PoE	Internal PoE Boost
Cisco ISR 4451		X	X		X	X
-X

1. Must have PoE boost installed.

	Hardware Installation Guide for the Cisco 4451-X Integrated Services Router
OL-27644-01		1-16