Cisco XR 12416 User manual

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Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide
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CHAPTER
1
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.

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Physical and Functional Description of Router
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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
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Alarm card

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Physical and Functional Description of Router
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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
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Physical and Functional Description of Router
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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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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).
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Physical and Functional Description of Router
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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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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
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Physical and Functional Description of Router
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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.