Table Of Contents
Cisco CRS-1 Carrier Routing System
Overview of Site Planning Steps
Cisco CRS-1 Carrier Routing System
This guide describes how to plan and prepare your facilities for the installation of a Cisco CRS-1 Carrier Routing System 16-Slot Line Card Chassis. Because the installation of a line card chassis may require space, floor loading, power, and cooling modifications to a facility, the site planning should be done well in advance of the scheduled delivery of the system.
Timesaver
If you are already familiar with Cisco CRS-1 routers and components, you can go straight to the "Overview of Site Planning Steps" section and the preliminary site survey in Appendix B, "Preliminary Site Survey."
This chapter describes the Cisco CRS-1 16-slot line card chassis and its main components. It contains the following sections:
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Overview
The Cisco CRS-1 16-slot line card chassis is a highly scalable routing platform designed for efficient service-provider point-of-presence (POP) evolution as the IP network grows into a multiservices network. The Cisco CRS-1 16-slot line card chassis, in the initial release, is constructed from a single line card chassis, a mechanical enclosure that contains 16 slots for modular services cards (MSCs) and associated physical layer interface modules (PLIMs), and eight slots for the complete or partial switch fabric.
The chassis is bolted to the facility floor and does not require an external rack. The chassis contains its own power and cooling systems. The chassis also contains route processor cards (RPs) that perform routing-protocol calculations. The RPs distribute forwarding tables to the MSCs, provide a control path to each MSC for system monitoring functions, and contain hard disks for system and error logging. RPs plug into two dedicated slots in the line card chassis.
Note
Figure 1-1 shows a Cisco CRS-1 single-shelf (standalone) system.
Figure 1-1 Cisco CRS-1 Single-Shelf (Standalone) Router
The Cisco CRS-1 16-slot line card chassis has 16 MSC slots, each with a capacity of 40 gigabits per second (Gbps) ingress and 40 Gbps egress, for a total routing capacity per chassis of 1280 Gbps, or 1.2 terabits. (A terabit is 1 x 1012 bits or 1000 gigabits.)
The router is built around a scalable, distributed three-stage Benes switch fabric and variety of data interfaces. The data interfaces are contained on PLIMs that are mated, in the line card chassis, to an associated MSC. MSCs, which are sometimes referred to as line cards, are cross-connected to each other through the switch fabric.
Line Card Chassis Components
The main building block of the Cisco CRS-1 router is the 16-slot line card chassis. The line card chassis is secured to the floor and has locking front and rear doors. No external racks are required for the installation of the chassis.
This section lists the main components of a line card chassis. It primarily identifies the components that are considered field-replaceable units (FRUs), but where additional detail is useful identifies subassemblies that are not field replaceable.
The line card chassis contains:
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An MSC exists, but it can be associated with several different PLIMs, which provide different interface speeds and technologies. The available PLIMs are:
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The RP also monitors system alarms and controls the system fans. LEDs on the front panel indicate active alarm conditions.
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The PLIM side of the chassis is considered the front of the chassis—this is where user data cables attach to the PLIMs and where cool air enters the chassis. The MSC side, which is where warm air is exhausted, is considered the rear of the chassis.
Figure 1-2 and Figure 1-3 show the front and rear views of an empty line card chassis.
Figure 1-2 Line Card Chassis Front View
Figure 1-3 Line Card Chassis Rear View
Overview of Site Planning Steps
Table 1-1 lists the steps to prepare your site for the installation of a Cisco CRS-1 line card chassis. Use the table as a checklist for all aspects of the installation. For information about a particular task, see the appropriate section of this site planning guide. After completing the checklist, you should consult your Cisco installation coordinator for a site readiness inspection.
See Appendix B, "Preliminary Site Survey," for a sample of the preliminary site survey that you should complete before you prepare a detailed site survey.
