Cisco 4948 Installation Guide - Page 25
Catalyst 4948E-F Fan Tray (WS-X4993-F - s power supply
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Chapter 1 Product Overview Figure 1-3 Catalyst 4948E Fan Tray 1 2 Fan Tray 278085 3 1 Backplane connector 2 Captive installation screw (2X) 3 12 VDC fan (4X). Air is drawn in from the front of the chassis and exhausted through the rear of the chassis. The fan tray draws in air through vents at the front of the chassis and exhausts it through the rear of the chassis as shown in Figure 1-4. Figure 1-4 Catalyst 4948E Chassis Airflow 207440 Catalyst 4948E-F Fan Tray (WS-X4993-F=) The Catalyst 4948E-F chassis fan tray (WS-X4993-F=) contains four variable-speed, 12 VDC fans. (See Figure 1-5.) The fan tray is mounted in the rear of the chassis between the two power supplies. OL-21561-02 Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide 1-9
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