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The S12518 chassis has the following slots and components:
•
Two MPU slots and 18 line card slots at the front, and nine switching fabric module slots at the rear.
Two power frames at the top, and each power frame can accommodate up to six power modules.
•
Two horizontally oriented fan trays at the rear. For the ventilation inside the chassis, see
•
Backplane
The backplane of an S12500 switch is located inside the chassis. It provides high-speed data switching
between switching fabric modules and line cards, and exchanges management and control signals
between MPUs and line cards/switching fabric modules. The backplane provides the following
capabilities:
•
Provides communication channels for signal exchange between cards.
Supports hot-swapping of cards.
•
Identifies card type.
•
Supplies power to MPUs, line cards, switching fabric modules, fan trays, and power modules when
•
connected to the power frame.
Provides monitoring channels to monitor power module status.
•
Fan tray
A fan tray contains fan units. The dimension of each fan unit is 120 × 120 × 38 mm (4.72 × 4.72 ×1.50
in).
Both the S12508 and the S12518 use an upper fan tray at the top and a lower fan tray at the bottom.
Each fan tray comprises 12 fan units and one fan monitoring board.
S12500 fan trays provide the following functions:
•
Effective heat dissipation and single-point of failure protection.
Status monitoring, including fan rotation speed monitoring and fault alarming.
•
Fan speed can be controlled by the MPU or automatically adjusted based on temperature. The
•
S12508 and S12518 have four groups of fans. Speed adjustment is done on a per-group basis to
decrease noise and improve energy efficiency.
Each fan tray has two LEDs on the front panel to show its operating status.
•
Hot swappable. The fans receive DC power from the backplane, and are hot swappable.
•
CAUTION:
The S12508 and S12518 use different fan trays, and do not support the intermixing of fan trays.
Figure 5
shows the S12508 fan tray. The physical view of the S12518 fan tray is similar.
7
Figure
7.
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