Please let me know the normal value of FAN RPM in “show chassis environment” as it was not mentioned in public documents.

Please let me know the RPM of the FAN when the FAN is fully installed and the RPM of the remaining FAN when the FAN is removed, respectively.

The fan speeds in ACX7100 routers are not a fixed RPM but rather adjusted based on temperature thresholds. 

The ACX7100 has a cooling system with fan modules that operate at different speeds to maintain optimal temperatures,

Each Fan Tray is a pluggable module and houses two 40mmx40mm counter rotating rotors.

You can check the RPM % using ‘show chassis fan’ CLI.

The maximum values of FAN1/FAN2 in each tray are 30000 RPM & 25000 RPM respectively. 

This is with additional 200 RPM tolerance & actual are 29800/24800 which is used for % calculations.

Also keep note of below points as well:

• - If any Fan Rotor is failed, all fans’ speed will be increased max to 100%, major alarm will be raised on Failed Fan Tray.
• - If more than one Fan Rotor are failed, all fans’ speed will be increased max to 100%. If more than one Fan Rotor are failed for more than 4 mins, chassis will be shut down.

The CLI 'show chassis temperature-thresholds' list all the temperature thresholds of all units in chassis.

So we can definitely assume that the RPM remain closer to 44% or 13200/11000 RPM, when the temperatures are in normal range.

labroot@jtac-acx7100-48l-ao-r2016> show chassis fan 

   Item           Status  % RPM   Measurement

   Fan Tray 0 Fan 1     OK    43%    13000 RPM         

   Fan Tray 0 Fan 2     OK    43%    10800 RPM         

   Fan Tray 1 Fan 1     OK    44%    13200 RPM         

   Fan Tray 1 Fan 2     OK    43%    10800 RPM         

   Fan Tray 2 Fan 1     OK    44%    13200 RPM         

   Fan Tray 2 Fan 2     OK    44%    11000 RPM         

   Fan Tray 3 Fan 1     OK    43%    13000 RPM         

   Fan Tray 3 Fan 2     OK    44%    11000 RPM         

   Fan Tray 4 Fan 1     OK    44%    13200 RPM         

   Fan Tray 4 Fan 2     OK    44%    11000 RPM         

   Fan Tray 5 Fan 1     OK    44%    13200 RPM         

   Fan Tray 5 Fan 2     OK    44%    11000 RPM         

labroot@jtac-acx7100-48l-ao-r2016> show chassis temperature-thresholds 

                    Fan speed   Yellow alarm   Red alarm   Fire Shutdown

                    (degrees C)   (degrees C)   (degrees C)   (degrees C)

Item                 Normal High  Normal Bad fan  Normal Bad fan   Normal

Routing Engine 0 CPU Inlet1        50  55    80    80    90    90    100

Routing Engine 0 CPU Temperature     65  70    95    95   100   100    103

Routing Engine 0 CPU Outlet1       50  55    80    80    90    90    100

Routing Engine 0 CPU Inlet2        50  55    80    80    90    90    100

CB 0 Main PCBRight            33  38    70    70    80    80     90

CB 0 Main PCBLeft             33  38    70    70    80    80     90

CB 0 Main Exhaust             50  55    80    80    90    90    100

CB 0 Main PCBCentral           50  55    80    80    90    90    100

CB 0 Main PCBCentral2           50  55    80    80    90    90    100

FPC 0 et-0/0/0              59  64    85    85    90    90     91

FPC 0 et-0/0/1              59  64    85    85    90    90     91

FPC 0 et-0/0/2              62  67    88    88    93    93     94

FPC 0 et-0/0/48              44  49    70    70    74    74     75

FPC 0 J2 HBM0               55  60    95    95   105   105    108

FPC 0 J2 HBM1               55  60    95    95   105   105    108

FPC 0 Sensor J2 Max Reading        60  65   105   105   110   110    113