Cisco CRS Carrier Routing System 8-Slot Line Card Chassis System Description
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Table of Contents




Document Organization

Document Conventions

Related Documentation

Software Documents

Changes to This Document

Obtaining Documentation and Submitting a Service Request


This preface explains the objectives, intended audience, and organization of this guide and includes the conventions used in this manual.


This guide describes the Cisco CRS 8-Slot Line Card Chassis from a system point of view. This guide focuses on the hardware elements, including descriptions of most of the major assemblies, such as the power and cooling systems, the switch fabric, route processor, and modular services cards. It also provides background information and the basic theory of operation for this routing system.

This guide can be read as a supplement to the Site Planning Guide, Installation Guide, and the related software documents.


This guide is intended for service provider customers and Cisco installation partners who have substantial background in configuring router-based internetworks and experience with routers and Cisco IOS XR software. The system description provides a high-level introduction to the components and vocabulary used within the Cisco CRS 8-Slot Line Card Chassis product.

Document Organization

This system description contains the following chapters and appendixes:

Document Conventions

This guide uses the convention where the symbol ^ represents the key labeled Control or Ctrl. For example, the key combination ^ z means hold down the Control key while you press the z key.

Command descriptions use these conventions:

  • Examples that contain system prompts denote interactive sessions, indicating the commands that you should enter at the prompt. The system prompt indicates the current level of the EXEC command interpreter. For example, the prompt router> indicates that you should be at the user level, and the prompt router# indicates that you should be at the privileged level. Access to the privileged level usually requires a password. Refer to the related software configuration and reference documentation listed in Related Documentation for additional information.
  • Commands and keywords are in bold.
  • Arguments for which you supply values are in italics.
  • Elements in square brackets ([ ]) are optional.
  • Alternative but required keywords are grouped in braces ({}) and separated by vertical bars (|).

Examples use these conventions:

  • Terminal sessions and sample console screen displays are in screen font.
  • Information you enter is in boldface screen font.
  • Nonprinting characters, such as passwords, are in angle brackets (< >).
  • Default responses to system prompts are in square brackets ([]).
  • Exclamation points (!) at the beginning of a line indicate a comment line.

Note Means reader take note. Notes contain helpful suggestions or references to materials not contained in this manual.

Timesaver Means the described action saves time. You can save time by performing the action described in the paragraph.

Caution Means reader be careful. You are capable of doing something that might result in equipment damage or loss of data.


Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. Use the statement number provided at the end of each warning to locate its translation in the translated safety warnings that accompanied this device. Statement 1071


Software Documents

For a complete listing of available software documentation for the Cisco CRS Carrier Routing System, see About Cisco IOS-XR Software Documentation.

Changes to This Document

Table 1 lists the technical changes made to this document since it was first printed.


Table 1 Changes to This Document

Change Summary

April 2015

Added information about the new back-to-back fabric card CRS-8-FC400/M.

March 2015

Added recommendation to use modular power supplies with CRS-X line cards and fabric cards.

December 2014

Added support for the CRS-MSC-X-L and CRS-FP-X-L line cards.

July 2014

Added support for new 2x100GE-FLEX-40 PLIM.

January 2014

Added updates to support the Cisco CRS-X, which includes new line cards, switch fabric cards, and PLIMs.

April 2012

Added Alarm Port section with pin outs to Chapter 6 to fix caveat.

November 2011

Updated text regarding exterior cosmetic components.

August 2011

Updated text and graphics based on documentation comments.

July 2011

Added information about new CRS-LSP Label Switch Processor (LSP) card.

June 2011

Updated text and graphics. Added Appendix B listing product IDs.

April 2011

Added information about new CRS-8-PRP-6G and CRS-8-PRP-12G Performance Route Processor (PRP) cards. Corrected graphics and made technical updates. Updated front matter.

March 2011

Added modular power configuration information and graphics. Added CRS-1 and CRS-3 information. Also added technical updates and made minor editorial changes. Power architecture diagrams were updated.

October 2010

Added information about the new MSC140 and FP140 line cards, CRS-8-FC/s and CRS-8-FC140/S switch fabric cards, 14-port and 20-port 10-GE PLIMs, and the 1-port 100-GE PLIM. Minor editorial and technical changes were also made.

September 2010

Added information in Installing Power Systems about the modular power system now available in addition to the standard, fixed power system. Updated Appendix A “Technical Specifications.”

June 2010

Added information in Chapter 2, “” about the modular power system now available in addition to the standard, fixed power system. Updated Appendix A, “Technical Specifications”

May 2008

Corrected the specifications in the “Regulatory, Compliance, and Safety Specification” section,

February 2008

The document was updated with technical corrections.

April 2006

  • Technical updates have been entered throughout the text.
  • The glossary was removed.
  • The title was changed to Cisco CRS 8-Slot Line Card Chassis System Description.

April 2005

  • In the “Software Documentation” section, a URL was added for the Getting Started guides.
  • The switch fabric card name was corrected from S123 to HS123. (part ID: CRS-8-FC/S.)
  • Chapter 1: The alphanumeric displays on the MSC, switch fabric card, and RP cards are explained in a new section.
  • Added Chapter 2: “Fixed Configuration DC Power” section.
  • The term load zone was modified to power zone for accuracy.
  • Modified Warning numbers to match the warnings presented in Regulatory Compliance and Safety Information for the Cisco CRS Carrier Routing System. The warnings changed as follows:

Page ix, Warning Statement 75 became Statement 1071. Text changed slightly.

Page 5-9, Warning Statement 26 became Statement 113. Text did not change.

Page 5-9, Warning Statement 70 became Statement 125. Text did not change.

December 2004

Initial release of this document.

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:

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