Product Overview
Figure 1 Cisco 12012—Front View
Top blower module | Frame | |
(behind front cover) | ||
|
Upper card cage |
Air filter tray 
Power supply bay 
Bottom blower module 
(behind front cover)
Lower card cage (behind air filter)
H10476
The lower card cage, located behind the air filter, has five keyed horizontal 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 (CSC) and the switch fabric card (SFC). Both types of cards are keyed to fit into specific slots in the lower card cage. You can install the clock and scheduler card only in the top two slots and the switch fabric card only in the lower three slots. The clock and scheduler card contains the system clock, switch fabric scheduler circuitry, and the switch fabric. The switch fabric card contains only switch fabric circuitry.
Below the lower card cage is a power supply bay. The Cisco 12012 can be configured for source AC or source DC operation. A system configured for source AC operation must have a minimum of two
The Cisco 12012 has two blower modules; one located above the upper card cage and one located below the power supply bay. They draw filtered cooling air in through both card cages and the power supply bay to maintain acceptable operating temperatures for the internal components.
2Cisco 12012 Gigabit Switch Router Card Cage Assembly Replacement Instructions