Nokia 7210 - 2.4.5 Alarms; 2.4.6 Air Ventilation; 2.4.7 Power Supplies

System Overview
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7210 SAS-D CHASSIS INSTALLATION GUIDE
3HE 10087 AAAA TQZZA Edition 01 Issue: 08
2.4.5 Alarms
When the switch has a major alarm, the CPU will turn the status LED amber. For
example, the switch raises a major alarm when the chassis temperature threshold
exceeded.
2.4.6 Air Ventilation
Maintain at least 3 in. (7.62 cm) of clearance on all sides of the device to ensure
proper air circulation through the chassis.
2.4.7 Power Supplies
The 7210 SAS-D comes with an integrated AC or DC power supply. The switch
supports two power supply options: universal AC and –48 VDC.
The 7210 SAS-D ETR provides three options: universal AC, –48 VDC, and 24 VDC.
Additionally, the switch supports an optional external backup power supply;
see section 3.2.6.
For specifications on the internal power supplies and input power requirements,
see section 7. The power supply options are shown in Figure 5.
Note: The 7210 SAS-D is equipped with a fan that provides air circulation in order to better
regulate the air temperature inside the chassis. The fan does not perform a cooling function.
By default the fan is turned off. Software controls the fan operation when it is set to auto
mode; the user has the option to turn it off. Please refer to the Software Release Notes for
information about software support for controlling fan behavior.