Fan Tray; Catalyst 4948E Fan Tray (Ws-X4993=) - Cisco 4948 - Catalyst Switch Installation Manual
Installation guide
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Also See for 4948 - Catalyst Switch:
- Datasheet (18 pages) ,
- Product bulletin (4 pages) ,
- Datasheet (14 pages)
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Fan Tray
Fan Tray
Both the Catalyst 4948E and the Catalyst 4948E-F switch chassis have a fan tray that is mounted in the
rear of the chassis between the two power supplies. The Catalyst 4948E chassis fan tray (WS-X4993=)
provides front-to-back air flow in the chassis and has a front panel that is color-coded dark grey. The
Catalyst 4948E-F chassis fan tray (WS-X4993-F=) provides back-to-front air flow and has a front panel
that is color-coded blue.
The two fan trays are not interchangeable between the Catalyst 4948E and the Catalyst 4948E-F chassis.
Note
The WS-X4993-F fan tray is keyed to prevent insertion in the Catalyst 4948E chassis.
Individual fan speed within the fan trays is controlled by redundant temperature sensors located at the
air flow inlet (in the front of the chassis for the Catalyst 4948E and in the rear of the chassis for the
Catalyst 4948E-F). There are six programmable temperature thresholds that trigger fan speed change. If
there is an individual fan failure, the fan speed on the remaining fans is adjusted to try to compensate for
the loss of the fan.
Table 1-3
Table 1-3
Fan Speed
Setting
Speed 0
Speed 1
Speed 2
Speed 3
1. Pulse-Width Modulation
2. Speed 3 is a fixed value and cannot be altered.
Catalyst 4948E Fan Tray (WS-X4993=)
The Catalyst 4948E fan tray (WS-X4993) contains four variable-speed, 12 VDC fans. (See
The fan tray is mounted in the rear of the chassis between the two power supplies.
The WS-X4993 fan tray is not interchangeable with the WS-X4993-F fan tray.
Note
Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide
1-8
lists the fan speed settings and the associated temperature thresholds.
Fan Speeds Versus Chassis Temperature Thresholds
1
PWM
Duty
Chassis Temperature Range Thresholds
Cycle
41%
T2—89.6°F (32°C)
Note
56%
T1—82.4°F (28°C)
•
•
T4—102.2°F (39°C)
Note
75%
T3—95.0°F (35°C)
T6—116.6°F (47°C)
Note
2
100%
T5—Greater than 109.4°F (43°C)
At T2, the fan speed increases to Speed 1.
At T1, the fan speed decreases to Speed 0. At T4, the fan
speed increases to Speed 2.
At T3, the fan speed decreases to Speed 1. At T6, the fan
speed increases to Speed 3.
Chapter 1
Product Overview
Figure
1-3.)
OL-21561-02
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Troubleshooting
