Are NCS540s (medium) noisy?

[albertino15886]

Hi, 

I'm testing a new NCS540 and I have found that is very noisy.

I checked the fan speed and it seems quite high but I don't know if it's normal or not.

===================================================================================================
Fan speed (rpm)
Location FRU Type FAN_0 FAN_1 FAN_2 FAN_3 FAN_4
---------------------------------------------------------------------------------------------------

0/FT0 N540-X-BB-FAN 21660 21480 21600 21540 21630

What's the normal speed for them?

Thanks,

Al

[mivens]

This is from a NCS540 not a NCS540X.
What does the output of "admin show env temp" say?
Are there any environmental alarms in the output of "admin show alarms" ?

Name: Rack 0 Descr: NCS 540 Series 16G 24x1/10GE, 8x10/25GE, 2x100GE Fixed Chassis
PID: N540-ACC-SYS VID: V02 SN: FOCxxxxxxx

=============================================
Location Fan Speed (rpm)
---------------------------------------------
0/FT0    FAN0 4712
0/FT1    FAN0 4568
0/FT2    FAN0 4817
0/FT3    FAN0 4900
0/PM0    FAN0 1920
0/PM1    FAN0 1888

================================================================================
Location TEMPERATURE         Value Crit Major Minor Minor Major Crit
                     Sensor (deg C) (Lo) (Lo) (Lo) (Hi) (Hi) (Hi)
--------------------------------------------------------------------------------
0/RP0
         Control Sensor      30 -40 -35 -30 63 72 80
         PHY0 Temp Sensor    38 -40 -35 -30 100 105 110
         PHY1 Temp Sensor    44 -40 -35 -30 100 105 110
         PORT-side Sensor    28 -40 -35 -30 100 105 110
         Slice 0 Die Temp    44 -40 -35 -30 115 120 125
         Slice 0 TMP421 Temp 39 -40 -35 -30 115 120 125
         CPU                 39 -40 -35 -30 90 96 102
         FAN-side Sensor     32 -40 -35 -30 100 105 110
0/PM0
         Hotspot Temperature 49 -30 -20 -10 60 62 65
0/PM1
         Hotspot Temperature 53 -30 -20 -10 60 62 65

[albertino15886]

Hi mivens,

thank you for your reply. 

Show env temp says that everything is ok.

Moreover, there are no alarms.

It is so strange because there are no cables connected and no configs. It is only connected via MGMT interface.

But fan speeds are very high.

[mivens]

The NCS540X is side-to-side airflow whereas the NCS540 is front-to-back. So the fantrays are very different and therefore the normal fan speed may be as well.

If you are just testing, you could try the command "environment raise-fan-speed 100" from admin and see if they go faster.

For the NCS540 in my lab, that increases the speed to 23k rpm, similar to your chassis.

sysadmin-vm:0_RP0(config)# environment raise-fan-speed 100
sysadmin-vm:0_RP0(config)# commit

=============================================
Location Fan Speed (rpm)
---------------------------------------------
0/FT0   FAN0 23376
0/FT1   FAN0 23076
0/FT2   FAN0 24107
0/FT3   FAN0 24324
0/PM0   FAN0 1888
0/PM1   FAN0 1888

[albertino15886]

   Admin mode has been deprecated.

There is no chance to configure that.

RP/0/RP0/CPU0:NCS540(config)#environment ?
air-filter                       chassis air-filter status
altitude                       Altitude of the chassis in meters
chassis-door-alarm    Control chassis door alarm
min-fan-speed           Min default fan speed in PWM (the speed cannot go lower, but can go higher based on environmental conditions)

[bsnlswami]

Configure environment min fan speed not available in Cisco NCS 560 version7. 5.2.pl help.. Fan is making huge noise and RPM is above 25000

[rmcconnell]

I suffer from the same problem. Has a solution been identified??

[albertino15886]

Hi,
I moved the NCS to another rack space to avoid proximity with other routers with different airflow. Things are better now.