Cisco 4506 switch creating High Noise

[Mohammed Asif C Y]

Hi,

We have a Cisco 4506 switch which is creating high noise if having two power supplies. If i remove any one of the power supply noise reduces and works normally.

Looks show environment output is ok, but not able to identify the exact issue.

----------------- show environment ------------------

no temperature alarms

Module Sensor                     Temperature          Status     

------+--------------------------+--------------------+------------

1      air inlet                  29C (51C,65C,68C)              ok

1      air outlet                 43C (69C,83C,86C)              ok

2      air inlet                  27C (45C,60C,70C)              ok

2      air outlet                 30C (61C,76C,86C)              ok

3      air inlet                  26C (45C,60C,70C)              ok

3      air outlet                 31C (61C,76C,86C)              ok

Power                                             Fan      Inline

Supply  Model No          Type       Status       Sensor   Status

------  ----------------  ---------  -----------  -------  -------

PS1     PWR-C45-1000AC    AC 1000W   good         good     n.a.  

PS2     PWR-C45-1000AC    AC 1000W   good         good     n.a.  

Power supplies needed by system    : 1

Power supplies currently available : 2

Chassis Type : WS-C4506-E

Power consumed by backplane : 0 Watts

Switch Bandwidth Utilization : 0%

Supervisor Led Color : Green

Module  1 Status Led Color  : Green         

Module  2 Status Led Color  : Green           PoE Led Color : Off           

Module  3 Status Led Color  : Green           PoE Led Color : Off           

Module  4 Status Led Color  : Green         

Module  5 Status Led Color  : Green         

Fantray : Good

Fantray removal timeout : 30

Power consumed by Fantray : 120 Watts

Regards
MAC       

[Reza Sharifi]

Hi,

Usually high noise come from a bad fan or a malfunction fan.

Call TAC and open a case and RMA the part if need to.

HTH

[Leo Laohoo]

Try removing the fan.  You have 30 seconds to put the fan back in before the chassis shuts down.

So remove the fan and observe if the squeeling dies down.  If it does, then you need to RMA the fan module.

If not, then either one of the PS has a faulty fan.

[Mohammed Asif C Y]

Hi Guys,

Thank you for replying, we have done a re-inseration of FAN tray but no use. If i run the chassis with single power suplly it works fine and no noise. Problems comes only when both the power supplies are ON.

Even we tried exchanging both the power supplie but no luck.

Regards
MAC