Справочник Пользователя для Enterasys Networks 24-Port

Mid-Span Power Hub 24-Port User’s Guide 3-1

 for a checklist of problems and recommended actions to resolve the 

problem. If additional support is needed, refer to “

Unit is plugged into the Enterasys Mid-Span 
Power Hub, but main power LED is “off.”

Verify the use of a good AC cable with a good 
ground connection. 

Verify that the AC is “hot” and that voltage is 
between 100 VAC to 264 VAC (50 Hz to 60 Hz). 

For the 24-port Mid-Span Power Hub, if the 
internal fan is working, there may be an internal 
circuitry fault or internal voltage that is out of 
specification. If the fan is not working, there may 
be an internal power supply fault.

Unit is plugged in and running, but the fans are 
not working.

Verify that all fan openings are clear. 

Verify that the metal case is not damaged.

Verify that there are no loose parts inside the 
Mid-Span Power Hub.

If needed, check and replace fuse at the inlet 
plug 10 A rated fuse.

The Mid-Span Power Hub operates but one of 
the powered devices does not work.

Verify that you are using a standard UTP Cat. 5, 
5e, or 6 cable, including all eight wires (four 
pairs). Try to move the same load into a 
different port on the same hub. If it works, there 
is probably a faulty port or bad RJ45 port 
connection. If possible, try to connect the load 
device into a different hub. Try using a different 
Ethernet cable; if it works, there is probably a 
faulty connection over the long cable, or a bad 
RJ45 connection.