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Cisco ASR 903 Router Hardware Installation Guide
OL-25178-04
Chapter 1 Cisco ASR 903 Router Overview
Cisco ASR 903 Router Features
Figure 1-2 shows the fan tray.
Figure 1-2 Cisco ASR 903 Router Fan Tray
For more information about air flow guidelines, see Air Flow Guidelines, page 2-11. For instructions on
how to install the fan tray, see Installing the Fan Tray, page 3-8. For a summary of the LEDs on the fan
tray, see “LED Summary” section on page 5-7.
RSP Modules
The Cisco ASR 903 Router is designed to use up to two RSP modules to handle the data plane, network
timing, and control plane functionalities for the router. The RSP configuration allows you to use Cisco
IOS software to control chassis management, redundancy, external management, and system status
indications on the router.
The following sections describe the Cisco ASR 903 Router RSP:
• Supported RSP Features, page 1-7
• RSP Redundancy, page 1-7
• Network Timing Interfaces, page 1-8
• RSP Interfaces, page 1-8
RSP features include:
• Loading software onto processor-based interface modules
• Redundant RSP management—The RSP manages detection of RSPs, exchange of health and status
information, role negotiation, function for detection, health and status exchange, role negotiation
• Packet processing
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