Router Installation Guide

1-3
Cisco XR 12404 Router Installation Guide
OL-13830-02
Chapter 1 Cisco XR 12404 Router Overview
Route Processor
• AC power entry module (PEM)—A customized and hot-swappable one-piece
unit. See the “Power Entry Modules” section on page 1-17 for information.
• DC power entry module (PEM) and DC power distribution unit (PDU)—Two
pieces that can be removed as one unit or in separate pieces. See the “Power
Entry Modules” section on page 1-17 for information.
Note When operating the router, both power module bays must have DC PEMs
and DC PDUs installed to ensure EMI compliance.
• Fan tray assembly—Supplies cooling air to the router. See the “Fan Tray
Assembly” section on page 1-20 for information.
• Cable management bracket used to neatly route line card cables. See the
“Cable Management System” section on page 1-22 for information.
• Maintenance Bus—Controls all of the MBus modules in the system. See the
“Maintenance Bus” section on page 1-24 for information.
Route Processor
The route processor for the Cisco XR 12404 router is the Performance Route
Processor (PRP-2). For detailed information about the PRP-2, refer to the Cisco
document, Performance Route Processor Installation and Configuration Guide.
The PRP-2 performs the following primary functions:
• Executes routing protocol stacks
• Performs all protocol communications with other routers
• Builds and distributes forwarding information to all line cards
• Uploads the operating system software images to all installed line cards
during power-on
• Provides out-of-band system console and auxiliary ports and an Ethernet port
for router configuration and maintenance
• Monitors and manages the power and temperature of system components
such as line cards, power supplies, and fans
todd.book Page 3 Tuesday, July 24, 2007 3:54 PM