Cisco Systems CRS-1 Chassis Components, Upper fan tray beneath cover, MSC slots, Lower fan tray

Chapter 1 Cisco CRS-1 Carrier Routing System

The Cisco CRS-1 8-Slot Line Card Chassis

Figure 1-2 Rear (MSC) View of the 8-Slot Line Card Chassis

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1	Upper fan tray (beneath cover)	4	MSC slots
2	Chassis vertical mounting brackets	5	Lower fan tray
3	Switch fabric card (half-height) slots	6	Power distribution units (PDUs)

Chassis Components

The Cisco CRS-1 8-slot line card chassis contains the following components:

•As many as eight modular services cards (MSCs), also called line cards, and eight physical layer interface modules (PLIMs). The MSC and PLIM are an associated pair of cards that mate through the chassis midplane. The MSC provides the forwarding engine for Layer 3 routing of user data, and the PLIM provides the physical interface and connectors for the user data.

The MSC can be associated with several different PLIMs, which provide different interface speeds and technologies. The available PLIMs are as follows:

–1-port OC-768c/STM-256c packet-over-SONET (POS). Available with short-reach (SR) optics.

–4-port OC-192c/STM-64c POS/DPT. Available with long-reach (LR), intermediate-reach (IR), short-reach (SR), and very-short-reach (VSR) optics.

–OC-48c/STM-16c POS/DPT, configurable with 1 to 16 ports. Available with long-reach (LR) and short-reach (SR) optics. This PLIM supports pluggable optics.

–10-Gigabit Ethernet (GE. Available in long-reach (LR) optics. This PLIM supports pluggable optics, and can be configured with 1 to 8 ports.

Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide

OL-5802-06 1-3