Table Of Contents

Overview

Chassis Overview

Chassis Components

Chassis Slot Numbers

Chassis Cable Management

Chassis Cooling System

Chassis Power System

Safety Guidelines

Preventing Electrostatic Discharge

Overview

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This installation guide describes how to install the power, air circulation, line card, and external components into and remove them from a Cisco CRS Carrier Routing System 8-Slot Line Card Chassis.

This chapter introduces the Cisco CRS 8-slot line card chassis at the highest level. It contains illustrations of the front and rear of the chassis, complete with callouts to each hardware component. For details on each subsystem discussed in this chapter, see Cisco CRS Carrier Routing System 8-Slot Line Card Chassis System Description.

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

Chassis Overview

The Cisco CRS 8-slot line card chassis can be installed in locations where the 16-slot system 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-mount chassis that contains the following major system components:

•Up to eight modular services cards (MSCs), forwarding processor (FP) cards, and label switch processor (LSP) cards, also called line cards (up to eight)

•Physical layer interface modules, or PLIMs (up to eight, one for each line card)

•Route processor (RP) cards (up to two) or performance route processor (PRP) cards (up to two)

•Switch fabric cards (four required)

•SPA Interface Processors (SIPs) and Shared Port Adapters (SPAs) which can be installed instead of PLIMs

–SIP is a carrier card that is similar to a PLIM and inserts into a line card chassis slot and interconnects to an MSC, FP, or LSP like a PLIM. Unlike PLIMs, SIPs provide no network connectivity on their own.

–SPA is a modular type of port adapter that inserts into a subslot of a compatible SIP carrier card to provide network connectivity and increased interface port density. A SIP can hold one or more SPAs, depending on the SIP type and the SPA size. POS/SDH and Gigabit Ethernet SPAs are available.

•A chassis midplane that connects MSCs, FPs, or LSPs to their PLIMs and to switch fabric cards

The Cisco CRS 8-slot line card chassis supports both 40 G and 140 G fabric cards and line cards. The Cisco CRS-1 Carrier Routing System uses fabric cards designed for 40 GB operation (FC/S cards) and the Cisco CRS-3 Carrier Routing System uses fabric cards designed for 140 GB operation (FC-140/S cards).

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Caution A router with a mixture of 40 G and 140 G fabric cards is not a supported mode of operation. Such a mode of operation is supported temporarily only during the upgrade process.

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Note Throughout this document, the term Cisco CRS Carrier Routing system refers to both the Cisco CRS-1 Carrier Routing System and the Cisco CRS-3 Carrier Routing System, unless otherwise specified.

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Chassis Components

This section lists the main components of a Cisco CRS 8-slot 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.

Figure 1-1 shows the front view of a Cisco CRS 8-slot line card chassis with a fixed configuration AC power system installed. The front view of a Cisco CRS 8-slot line card chassis with a fixed configuration DC power system installed is similar.

Figure 1-1 Front (PLIM) View of Line Card Chassis—Fixed Configuration Power Shown

1	Cable management bracket	4	Air filter
2	Chassis vertical mounting brackets	5	Power System
3	PLIM and RP slots (RPs in middle 2 slots)

Figure 1-2 shows the rear view of a Cisco CRS 8-slot line card chassis with fixed configuration AC and DC power systems installed.

Figure 1-2 Rear (MSC) View of Line Card Chassis—Fixed Configuration Power Shown

Figure 1-3 shows the front view of a Cisco CRS 8-slot line card chassis with modular configuration AC and DC power systems installed.

Figure 1-3 Front (PLIM) View of Line Card Chassis—Modular Configuration Power Shown

Figure 1-4 shows the rear view of a Cisco CRS 8-slot line card chassis with modular configuration AC and DC power systems installed.

Figure 1-4 Rear (MSC) View of Line Card Chassis—Modular Configuration Shown

Figure 1-5 shows the rear view of a Cisco CRS 8-slot line card chassis with a fixed configuration AC power system installed.

Figure 1-5 Rear (MSC) View of Line Card Chassis—Fixed Configuration Shown

1	Upper fan tray (beneath cover)	5	Lower fan tray
2	Chassis vertical mounting brackets	6	Rear exhaust screen
3	Switch fabric card (half-height) slots	7	Power system
4	MSC slots

The Cisco CRS 8-slot line card chassis contains:

•As many as eight MSC, FP or LSP cards (all types are also called line cards), and eight PLIMs. The line card and PLIM are an associated pair of cards that mate through the chassis midplane. The line card 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 line card can be associated with several different PLIMs, which provide different interface speeds and technologies.

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Note For a complete list of line cards, route processors, SPAs and SIPs, and interface modules supported in the Cisco CRS 8-slot line card chassis, go to the Cisco Carrier Routing System Data Sheets at: http://www.cisco.com/en/US/products/ps5763/products_data_sheets_list.html.

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•A chassis midplane that connects line cards to their associated PLIMs. The midplane design allows a line card to be removed from the chassis without having to disconnect the cables that are attached to the associated PLIM. The midplane distributes power, connects the line cards to the switch fabric cards, and provides control plane interconnections. The midplane is not field replaceable by the customer.

•One or two route processor cards (RPs). The RPs provide the intelligence of the system by functioning as the Cisco CRS 8-slot line card chassis system controller (serving as part of the control plane in multi-chassis systems) and providing route processing. Only one RP is required for system operation. For redundant operation, you can order a second RP as an option (CRS-8-RP/R). When two RPs are used, only one RP is active at a time. The second RP acts as a "standby" RP, serving as a backup if the active RP fails.

The RP also monitors system alarms and controls the system fans. LEDS on the front panel indicate active alarm conditions.

A Performance Route Processor (PRP) is also available for the Cisco CRS 8-slot line card chassis. Two PRPs perform the same functions as two RPs, but provide enhanced performance for both route processing and system controller functionality.

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Note A chassis may not be populated with a mix of RP and PRP cards. Both route processor cards should be of the same type (RP or PRP).

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•Upper and lower fan trays. The fans pull cool air through the chassis. A removable air filter is located below the PLIM card cage at the front of the chassis.

•Four half-height switch fabric cards (SFCs). These cards provide the three-stage Benes switch fabric for the routing system. The switch fabric performs the cross-connect function of the routing system, connecting every MSC (and its associated PLIM) with every other MSC (and its associated PLIM) in the system.

The switch fabric receives user data from one line card and PLIM pair and performs the switching necessary to route the data to the appropriate egress line card and PLIM pair. The switch fabric is divided into eight planes that are used to evenly distribute the traffic across the switch fabric. Each switch fabric card implements two planes of the switch fabric.

•A power system that provides redundant power to the chassis. Two types of power systems are available: fixed configuration power and modular configuration power. Both power configurations use either AC or DC power. The fixed configuration power solution contains two power distribution units (PDUs), with either one AC rectifier or one DC power entry modules (PEM) per PDU. The modular configuration power solution contains two power shelves with either up to four DC power modules (PMs) or up to three AC PMs per power shelf.

The PLIM side of the chassis is considered the front of the chassis, where user data cables attach to the PLIMs and cool air enters the chassis. The MSC side, which is where warm air is exhausted, is considered the rear of the chassis.

Chassis Slot Numbers

This section identifies the location and slot numbers for major cards and modules (primarily the field-replaceable units) that plug into the chassis.

Figure 1-6 shows the slot numbering on the front (PLIM) side of the Cisco CRS 8-slot line card chassis.

Figure 1-6 Line Card Chassis Slot Numbering—Front (PLIM) Side

As shown, the Cisco CRS 8-slot line card chassis numbers on the PLIM side of the chassis include the card cage with:

•Eight PLIM slots: left to right, 0, 1, 2, 3, 4, 5, 6, 7

•Two route processor card slots, RP0 and RP1

•Power shelf A and power shelf B

Figure 1-7 shows the slot numbers on the rear (MSC) side of the Cisco CRS 8-slot line card chassis.

Figure 1-7 Line Card Chassis Slot Numbers—Rear (MSC) Side

As shown, the slot numbers on the MSC side of the chassis include:

•Fan tray 0 and fan tray 1

•Card cage, including:

–Eight line card slots (0, 1, 2, 3, 4, 5, 6, 7)

–Four half-height switch fabric card slots (SM0, SM1, SM2, and SM3)

•Power shelf A and Power shelf B

The MSC slot numbers are reversed from the PLIM slot numbers on the other side of the chassis. Because an MSC mates with its associated PLIM through the midplane, MSC slot 0 is on the far right side of the chassis looking at it from the rear (MSC) side.

PLIM slot 0 is on the far left side of the chassis, looking at if from the front (PLIM) side. MSC slot 0 and PLIM slot 0 mate with each other through the midplane, and so do all other MSC and PLIM slots (0 through 7).

Chassis Cable Management

The Cisco CRS 8-slot line card chassis has cable management features for the front (PLIM) side of the chassis, just above the card cage. The horizontal cable management trays have a special telescoping feature that allows them to be extended when the chassis is upgraded with higher-density cards. This extension also helps when installing the cables in the chassis.

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Note Do not install the front cover on the chassis when the telescoping feature is in use.

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Figure 1-8 shows the cable management bracket.

Figure 1-8 Cable Management Bracket

Chassis Cooling System

The chassis has two fan trays, each with four fans, that cool the chassis card cages. Cool air flows in at the bottom front of the chassis and flows through the chassis card cages and through the fans in the fan trays before being exhausted through the bottom rear of the chassis (see Figure 1-9). In addition, each AC or DC power module at the bottom of the chassis has self-contained fans that pull in cool air from the front of the chassis and exhaust warm air out the rear.

A replaceable air filter is located on the front of the chassis below the PLIM card cage. Each fixed configuration power module also has a replaceable air filter that attaches to the module at the front (PLIM) side of the chassis. How often the air filters should be replaced depends on the facility environment. In a dirty environment, or when you start getting frequent temperature alarms, you should always check the intake grills for debris, and then check the air filters to see if they need to be replaced.

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Note We recommend that you check the air filters once a month. Replace a filter when you notice a significant amount of dust.

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Figure 1-9 Airflow Through 8-Slot Line Card Chassis

Chassis Power System

Two types of power systems are available for the Cisco CRS 8-slot line card chassis: fixed configuration power and modular configuration power. Both power systems can be powered by either AC or DC power. The chassis power system takes the facility power and converts it to the DC voltage necessary to power chassis components.

For more information, refer to Chapter 2, "Installing and Removing Power Components."

Safety Guidelines

Before you perform any procedure in this document, review the safety guidelines in this section to avoid injuring yourself or damaging the equipment. The following guidelines are for your safety and to protect equipment. The guidelines do not include all hazards. Be alert.

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Note Review the safety warnings listed in Regulatory Compliance and Safety Information that are applicable to your router before installing, configuring, or troubleshooting any installed card.

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•Keep the work area clear and dust-free during and after installation. Do not allow dirt or debris to enter into any laser-based components.

•Do not wear loose clothing, jewelry, or other items that could get caught in the router while working with line cards, or their associated components.

•Cisco equipment operates safely when used in accordance with its specifications and product-usage instructions.

•Be sure to power down a fixed configuration PDU or modular configuration power shelf before removing it from the chassis.

Preventing Electrostatic Discharge

Electrostatic discharge (ESD) damage, which can occur when electronic cards or components are improperly handled, results in complete or intermittent failures. We recommend to use an ESD-preventive strap whenever you handle network equipment or one of its components.

Following are guidelines for preventing ESD damage:

•Always use an ESD-preventive wrist or ankle strap and ensure that it makes good skin contact. Connect the equipment end of the connection cord to an ESD connection socket on the router or to a bare metal surface on the chassis.

•Handle a card by its ejector levers, when applicable, or the card's metal carrier only; avoid touching the board or connector pins.

•Place a removed card board-side-up on an antistatic surface or in a static-shielding bag. If you plan to return the component to the factory, immediately place it in a static-shielding bag.

•Avoid contact between the card and clothing. The wrist strap protects the board only from ESD voltage on the body; ESD voltage on clothing can still cause damage.