Cisco XR 12416 Manuale utente

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

OL-17440-01

CHAPTER

Product Overview

This chapter provides an overview of the Cisco XR 12416 and Cisco XR 12816

Router. It contains physical descriptions of the router hardware and major

components, as well as functional descriptions of the hardware-related features.

Physical and Functional Description of Router

The Cisco XR 12416 and Cisco XR 12816 Router chassis is a sheet-metal

enclosure that houses router components. The major components consist of three

power supplies, upper and lower line card cages, a switch fabric card cage, and

upper and lower blower modules. Power is distributed to these components over

the chassis backplane.

All router models contain the following major components (Figure 1-1):

•Power shelf and power supplies—Three AC or DC power entry modules

(PEMs) provide power to the router. See the “AC and DC Power Subsystems”

section on page 1-4 for additional information.

•Upper blower module—Supplies cooling air to the upper half of the router so

it does not overheat. See the “Blower Module” section on page 1-36 for

additional information.

•Upper and lower cable management brackets—Used to neatly route line card

cables. See the “Upper and Lower Cable Management Brackets” section on

page 1-36 for additional information.

Chapter 1 Product Overview

Physical and Functional Description of Router

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

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•Upper Line card and Route Processor card cage—Has 8 user-configurable

slots that support a combination of line cards, a route processor (RP), and an

alarm card. See the “Alarm Card and Line Card Overview” section on

page 1-18 for additional information.

•Switch fabric card cage—Located behind the air filter door, this card cage

contains 5 slots for the switch fabric card set. The switch fabric card set is

made up of 3 switch fabric cards (SFCs) and 2 clock scheduler cards (CSCs).

See the “Switch Fabric Overview” section on page 1-16 for additional

information.

•Lower Line card and Route Processor card cage—Has 8 user-configurable

slots that support a combination of line cards, a redundant route processor

(RP), and an alarm card. See the “Alarm Card and Line Card Overview”

section on page 1-18 for additional information.

•Lower blower module—Supplies cooling air to the lower half of the router so

it does not overheat. See the “Blower Module” section on page 1-36 for

additional information.

•Chassis backplane (not shown)—Distributes power to card cages and to the

blower modules.

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Chapter 1 Product Overview

Physical and Functional Description of Router

Figure 1-1 Cisco XR 12016 Router Components—Front View

Switch fabric

card cage

(behind filter door)

PWROK

FAULT

TEMP

ILIM

PWROK

FAULT

TEMP

ILIM

PWROK

FAULT

TEMP

ILIM

ALARM

ENABLED

FAIL

ACO/LT

ALARM

CSC

FAIL

ENABLED

CRITICAL

MAJOR

MINOR

SFC

ACTIVE

CARRIER

RXPKT

ACTIVE

CARRIER

RXPKT

ACTIVE

CARRIER

RXPKT

ACTIVE

CARRIER

RXPKT

Q OC-3/STM-POS

6DS3–SMB P

DOWN

LOOP RA LA

CDHNT CD

12DS3–SMB P

DOWN

LOOP RA LA

CDHNT CD

ACTIVE

CARRIER

RXPKT

OC-48/STM-16-SCPOS

ACTIVE

CARRIER

RXCELL

OC-12/STM-4ATM

FASTETERNET

SLOT-0

ROUTE PROCESSOR

SLOT-1

COLL

LINK

RJ-45

MII

RESET

AUX

CONSOLE

EJECT

SLOT-0

ROUTE PROCESSOR

SLOT-1

COLL

LINK

RJ-45

MII

RESET

AUX

CONSOLE

EJECT

FASTETERNET

ACTIVE

CARRIER

RXCELL

OC-12/STM-4ATM

ACTIVE

CARRIER

RXPKT

OC-48/STM-16-SCPOS

12DS3–SMB P

DOWN

LOOP RA LA

CDHNT CD

6DS3–SMB P

DOWN

LOOP RA LA

CDHNT CD

ACTIVE

CARRIER

RXPKT

ACTIVE

CARRIER

RXPKT

ACTIVE

CARRIER

RXPKT

ACTIVE

CARRIER

RXPKT

Q OC-3/STM-POS

ALARM

ENABLED

FAIL

ACO/LT

ALARM

CSC

FAIL

ENABLED

CRITICAL

MAJOR

MINOR

SFC

26194

Power shelf and

power supplies

Air filter door

Upper blower

module

Upper cable

management

bracket

Lower cable

management

bracket

Lower blower

module

Upper card cage

Alarm card

Lower card cage

Alarm card

Chapter 1 Product Overview

Physical and Functional Description of Router

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

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AC and DC Power Subsystems

A router ships with either an AC or DC powered system. Source power connects

to the power shelf at the back of the chassis which route power to the power

supplies, also referred to as power entry modules (PEMs).

Standard AC Power Shelf

The standard AC-input power subsystem consists of a single-level AC-input

power shelf that house three AC power supplies which supply full redundant

power to the router.

The power supplies participate in an N+1 redundant current-sharing scheme that

is divided among all three power supplies. If one power supply fails, the system

can continue to operate temporarily, (depending on your system configuration)

with the remaining two power supplies. Failed power supplies should be replaced

as soon as possible to ensure full redundancy.

Caution To ensure that the chassis configuration complies with the required power

budgets, use the on-line power calculator. Failure to properly verify the

configuration may result in an unpredictable state if one of the power units fails.

Contact your local sales representative for assistance.

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Chapter 1 Product Overview

Physical and Functional Description of Router

Figure 1-2 Standard AC-Input Power Subsystem

Caution A router equipped with the standard AC power subsystem must be operated with

three power supplies installed in the power shelf at all times for electromagnetic

compatibility (EMC).

AC power to the router is provided through power cords connected from AC

power outlets to connectors on back of the power shelf as shown in Figure 1-3.

Figure 1-3 Standard Power Shelf AC-Input Connections

26198

PWROK

FAULT

TEMP

I LIM

PWROK

FAULT

TEMP

I LIM

PWROK

FAULT

TEMP

I LIM

26199

Power cord

retention clip

Chapter 1 Product Overview

Physical and Functional Description of Router

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

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Optional AC Power Shelf

The power subsystem consists of a double-level AC-input power shelf with bays

for 4 AC-input power supplies. Figure 1-4 shows the optional power shelf. It

attaches to the top of the router chassis and is secured to the chassis the same way

as the standard AC-input power shelf.

Note A router equipped with the optional AC-input power subsystem stands 77.5 inches

(196.85 cm) tall and does not fit in a standard 7-foot (2.1 m) rack.

The 4 power supplies in the optional power shelf participate in an N+2 redundant

current-sharing scheme in which current sharing is divided among all 4 power

supplies. Up to two power supplies can fail and the system can continue to operate

temporarily, (depending on your system configuration) using the remaining two

power supplies. Failed supplies should be replaced as soon as possible to ensure

full redundancy.

Caution To ensure that the chassis configuration complies with the required power

budgets, use the on-line power calculator. Failure to properly verify the

configuration may result in an unpredictable state if one of the power units fails.

Contact your local sales representative for assistance.

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

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Chapter 1 Product Overview

Physical and Functional Description of Router

Figure 1-4 Optional AC-Input Power Subsystem

Caution A router equipped with the optional AC power subsystem must be operated with

4 power supplies installed in the power shelf at all times for electromagnetic

compatibility (EMC).

27837

PWROK

FAULT

TEMP

I LIM

PWROK

FAULT

TEMP

I LIM

PWROK

FAULT

TEMP

I LIM

PWROK

FAULT

TEMP

I LIM

Chapter 1 Product Overview

Physical and Functional Description of Router

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

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AC power to the router is provided through power cords connected from AC

power outlets to the connectors on the back of the power shelf as shown in

Figure 1-5.

Figure 1-5 Optional Power Shelf AC-Input Connections

27838

Power cords

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

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Chapter 1 Product Overview

Physical and Functional Description of Router

AC Power Supplies

Each AC PEM converts 200 to 240 VAC into -48 VDC, which is distributed

through the chassis backplane to all cards, RPs, and the blower modules.

Figure 1-6 identifies the components of a 2500 W AC power supply.

Figure 1-6 2500 W AC Power Supply Components

1Ejector handle 2Captive screw

129495

Pwr Ok

Fault Temp

Pwr Ok

Fault Temp

Chapter 1 Product Overview

Physical and Functional Description of Router

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

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The status LEDs on an AC PEM provide information about the current operational

status of the power supply:

•PWR OK (green)—Indicates that the power supply module is operating

normally.

•FAULT (yellow)—Indicates that a fault is detected within the PEM.

•TEMP (yellow)—Indicates the PEM is in an overtemperature condition and

shutdown has occurred.

•ILMI (yellow)—Indicates the PEM is operating in a current-limiting

condition.

For additional information about troubleshooting AC PEMs, see the

“Troubleshooting an AC Power Supply” section on page 4-5.

DC Power Shelf

A DC-input power subsystem consists of a DC-input power shelf that houses 4

DC PEMs that provide full redundant power to the router. Figure 1-7 shows a

DC-input power shelf.

The chassis is electrically divided between the PEMS. These sections are referred

to as power zones and are labeled accordingly:

•Two PEMs power the upper card cage (Zone 1)

•Two PEMs power the lower card cage (Zone 2)

Each zone provides power to one blower, one alarm card, line cards and route

processor cards.

Zone 2 also supplies power to all switch fabric cards. The result is that there is

less power available for line cards in Zone 2, limiting the number of high-powered

line cards that can be configured in the lower cage.

Caution To ensure that the chassis configuration complies with the required power

budgets, contact your sales representative to provide you with the required power

calculator. Failure to properly verify the configuration may result in an

unpredictable state if one of the power units fails.

Contact your local sales representative for assistance.

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