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The power supplies can be swapped in or out of the device while the device is
running. You can remove and insert a power supply without opening the chassis.
The remaining supply provides enough power for the entire system.
The following sections provide further details about the power supplies for the
switches:
v Power status LEDs are listed in "Observing the power status LEDs" on page 20.
v Hardware specifications for the power supplies are listed in "Hardware
v "About redundant power supplies and power supply failure."
AC power supplies
Figure 6 shows a rear view of a device containing one AC power supply.
Power Supply
Figure 6. AC power supply
About redundant power supplies and power supply failure
If the switches have redundant power supplies installed, the switches can maintain
full operation when one power supply fails. For greater assurance of continued
operation, each power supply should be connected to a separate building circuit or
power source.
Cooling system and fans
This section describes the six cooling fans installed in these switches.
Figure 7. Six cooling fans
The B48C and B50C cooling fans pull the air from the front to the back of the
device.
The fans in the switches include six four-speed fans that operate at low speed,
medium speed, medium-high speed, and high speed based on the ambient
temperature and the configured or default temperature thresholds. All fans operate
simultaneously at the same speed. If one fan fails, it does not affect the operation
of the other fans.
System fan speed is determined by the default temperature threshold or the
manually configured temperature threshold. If desired, you can change the
temperature thresholds associated with fan speed switches.
8
IBM Ethernet Switch c-series Installation and User Guide
specifications," on page 59.
6 cooling fans
Fans
net48bc010
net48bc012
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