Doc. No. 78-4343-02
Cisco 12012 Gigabit Switch Router Switch Fabric
Cards Replacement Instructions
Product Numbers: GSR12-CSC=, GSR12-SFC=
Document Order Number: DOC-784343=
This document covers the installation and replacement of clock and scheduler cards and switch fabric cards in the Cisco 12012 Gigabit Switch Router (GSR). The Cisco 12012 is a member of the Cisco 12000 series of Internet routing products. The Cisco 12012 is aimed at scaling the Internet and enterprise backbones to speeds of OC-3/STM-1 (155 Mbps), OC-12/STM-4 (622 Mbps), and OC-48/STM-16 (2.4 Gbps). The Cisco 12012 is built around a high-speed switching fabric that is scalable from 5 to 60 Gbps, providing high-performance to support Internet Protocol (IP) -based local-area networks (LANs) and wide-area networks (WANs).
The sections in this document include the following:
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Product Overview, page 2
Safety Guidelines, page 4
Tools and Parts Required, page 6
Removing and Replacing a Card in the Lower Card Cage, page 7
Checking the Installation, page 12
FCC Class A Compliance, page 12
Cisco Connection Online, page 13
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Product Overview
The Cisco 12012 has two card cages; the upper card cage and the lower card cage. (Refer to Figure 1.) The upper card cage has 12 user-configurable slots available for line cards and a route processor (RP). One additional slot (rightmost slot) in the upper card cage is non-configurable; it is reserved for an alarm card. The line cards and the RP are not slot dependent; you can install the line cards and the RP in any of the first 12 available slots.
Figure 1 Cisco 12012 Router—Front View
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Upper card cage |
Air filter tray
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Power supply bay
Bottom blower module (behind front cover)
H10476
Lower card cage (behind air filter)
The lower card cage, located behind the air filter, has five horizontal keyed slots for cards containing the switch fabric circuitry. The cards provide the physical pathway for data packet exchange between the line cards in the upper card cage.
There are two types of cards installed in the lower card cage; the clock and scheduler card and the switch fabric card. The clock and scheduler card is keyed for installation in either of the upper two slots in the lower card cage. The switch fabric card is keyed for installation in the lower three slots of the lower card cage. The cards in the lower card cage are also color-coded; the clock and scheduler cards have a light blue label attached and the switch fabric cards have a magenta label attached. You match the label on the card with a similar color-coded label attached to the slot in the lower card cage.
2 Cisco 12012 Gigabit Switch Router Switch Fabric Cards Replacement Instructions
Product Overview
The Cisco 12012 requires that one clock and scheduler card be installed in the lower card cage. You can add one additional clock and scheduler card for redundancy and to increase the amount of data able to be transferred between line cards. The clock and scheduler card contains the following functionality:
•System clock—Sent to all line cards, RP, and switch fabric cards. The system clock synchronizes data transfers between line cards or line cards and the RP through the switch fabric. In systems with redundant clock and scheduler cards, the two system clocks are synchronized. Should one system clock fail, the other clock takes over.
•Scheduler—Handles requests from the line cards for access to the switch fabric. When the scheduler receives a request from a line card for switch fabric access, the scheduler determines when to allow the line card access to the switch fabric.
•Switch fabric—The circuitry that carries the user traffic between line cards or between the RP and a line card. The switch fabric on the clock and scheduler card is identical to the switch fabric on the switch fabric card.
Note In a system configured with only one clock and scheduler card, the clock and scheduler card is installed in the second slot from the top in the lower card cage.
The switch fabric card contains only the switch fabric circuitry that carries the user traffic between line cards or between the RP and the line cards. The card receives scheduling information and the system clock from the clock and scheduler card. The card is keyed to occupy slots 2, 3, and 4 (lower three slots) in the lower card cage. The system can run without any switch fabric cards installed.
However, if you want to maximize the bandwidth and switching capacity of the system, you must install three switch fabric cards in the lower card cage.
Cisco 12012 Gigabit Switch Router Switch Fabric Cards Replacement Instructions 3
There are no status LEDs on the clock and scheduler card or switch fabric card, and the lower card cage slots are hidden behind the air filter. Status for the lower card cage slots is displayed on five pairs of LEDs located on the alarm card (installed in the rightmost slot in the upper card cage). Each pair of LEDs displays the status of one slot in the lower card cage (refer to Figure 2) as follows:
•Enabled—When this green LED is on, the card installed in that lower card cage slot is recognized by the system and functioning correctly. When the LED is off, either the slot is empty or the card installed in the slot is faulty.
•Fail—When this red LED is on, a fault has been detected in the card installed in that lower card cage slot. During normal operation, the fail LED should remain off.
Figure 2 Lower Card Cage Status LEDs on the Alarm Card
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minor alarm LEDs |
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ALARM 1 |
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ALARM |
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H10900
Pin 25 |
Pin 25 |
Clock and scheduler card |
Audio alarm |
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and switch fabric card LEDs |
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cutoff switch |
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CRITICALMAJORMINOR
Safety Guidelines
Before you begin this installation, review the safety guidelines in this section to avoid injuring yourself or damaging the equipment.
In addition, review the safety warnings listed in the document Regulatory Compliance and Safety Information for the Cisco 12012 Gigabit Switch Router (Document Number 78-4347-xx) that supports your Cisco 12012 before installing, configuring, or maintaining the router.
The following guidelines will help ensure your safety and protect the equipment. This list is not inclusive of all potentially hazardous situations, so be alert.
•Always disconnect all power cords and interface cables before moving the system.
•Keep tools and components away from walk areas.
•Do not work alone if potentially hazardous conditions exist.
•Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
•Carefully examine your work area for possible hazards such as moist floors, ungrounded power extension cables, and missing safety grounds.
4 Cisco 12012 Gigabit Switch Router Switch Fabric Cards Replacement Instructions
Safety Guidelines
The line cards, route processor (RP), switch fabric cards, alarm card, blower modules, and redundant power supplies are designed to be removed and replaced while the system is operating without presenting an electrical hazard or damage to the system.
Follow these basic guidelines when working with any electrical equipment:
•Before beginning any procedures requiring access to the interior of the Cisco 12012, locate the emergency power-off switch for the room in which you are working.
•Look carefully for possible hazards in your work area, such as moist floors, ungrounded power extension cables, and missing safety grounds.
•If an electrical accident occurs, proceed as follows:
—Use caution; do not become a victim yourself. Disconnect power to the system.
—If possible, send another person to get medical aid. Otherwise, assess the condition of the victim and then call for help.
—Determine if the person needs rescue breathing or external cardiac compressions; then take appropriate action.
•Disconnect all power and external cables before installing or removing a router.
•Never assume that power has been disconnected from a circuit; always check.
•Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
•Never install equipment that appears damaged.
In addition, use the guidelines that follow when working with any equipment that is disconnected from a power source, but still connected to telephone or network wiring:
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Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
•Never touch uninsulated telephone wires or terminals unless the telephone line has been disconnected at the network interface.
•Use caution when installing or modifying telephone lines.
Cisco 12012 Gigabit Switch Router Switch Fabric Cards Replacement Instructions 5