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Cisco CRS-1 Carrier Routing System 4-Slot Line Card Chassis Installation Guide
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Overview
This chapter introduces the Cisco CRS-1 Carrier Routing System 4-Slot Line Card Chassis a t the highest
level. It contains illustrations of the front and back of the chassis, complete with callouts to each
hardware component. For details on each subsystem discussed in this chapter, see Cisco CRS-1 Carrier
Routing System 4-Slot Line Card Chassis System Description. This chapter also provides the
recommended task sequence for installing the major components in the chassis.
This chapter presents the following topics:
• Chassis Overview
• Chassis Components
• Chassis Slot Numbers
• Chassis Cable Management
• Chassis Cooling System
• Chassis Power System
• Safety Guidelines
• Preventing Electrostatic Discharge
• Recommended Chassis Installation Task Sequence
Chassis Overview
The Cisco CRS-1 4-slot routing system can be installed in locations where the 16-slot or 8-slot systems
may not fit (for example, colocation facilities, data centers, and many Tier II and Tier III locations). The
routing system consists of a single rack-mounted chassis that contains the following system components:
• Switch fabric cards (SFCs) (up to four)
• Route processor (RP) cards (up to two)
• Modular services cards (MSCs), also called line cards, (up to four)
• Physical layer interface modules, or PLIMs, (up to four, one for each MSC)
• A chassis midplane that connects MSCs to their associated PLIMs and to the SFCs
The Cisco CRS-1 4-slot line card chassis has its own power and cooling subsystems. The power shelf
(AC or DC as ordered) is pre-installed in the chassis when you receive the routing system.