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What is the difference between the MLX high and standard speed exhaust fan?

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TitleWhat is the difference between the MLX high and standard speed exhaust fan?
Question
MLX high and standard speed exhaust fan details.
Environment
Answer
The MLX has two types of fans: high speed and standard. The difference between these two types is fan speed capability.

From the Hardware Guide:

Fan and switch fabric requirements for NI-MLX-10Gx8-M and NI-MLX-1Gx48-T-A interface modules in 16-slot routers:

If you install NI-MLX-10Gx8-M, NI-MLX-10x8G-D or NI-MLX-1Gx48-T-A interface modules in a 16-slot router, you must replace the standard fans on the back of the router with high speed fans. You must also replace standard switch fabric modules with high-speed switch fabric modules.

If the 16-slot router is not upgraded to support NIBI-16-FAN-EXH-A modules before NIMLX-1GX48-T-A modules are installed, the following Syslog message is displayed:
SYSLOG: Mar 26 14:19:53:<12>R1, 48X1G modules in slots 10,11,13,16 shouldn't be running without high speed fans

MLXhigh and standard speed exhaust fan pictures:

High speed fan:





Standard speed fan:



As you can see, the difference between these two types of fans are that the high speed fans extend out the chassis, and the standard fans are flat.

In an MLX-16 slot chassis, you will see the following output in the show chassis:

Example of old fans in MLX chassis:

MLX16# sh ver
System Mode: MLX
Chassis: NetIron 16-slot

--- FANS ---
Bottom fan tray (fan 1): Status = OK, Speed = MED-HI (90%)
Bottom fan tray (fan 2): Status = OK, Speed = MED-HI (90%)
Bottom fan tray (fan 3): Status = OK, Speed = MED-HI (90%)
Bottom fan tray (fan 4): Status = OK, Speed = MED-HI (90%)
Bottom fan tray (fan 5): Status = OK, Speed = MED-HI (90%)
Bottom fan tray (fan 6): Status = OK, Speed = MED-HI (90%)
Back Fan A (revision 0x08): Status = OK, Speed = MED-HI (90%)
Back Fan B (revision 0x08): Status = OK, Speed = MED-HI (90%)



Example of new fans in MLX chassis (notice Rev-A listed):

MLX-2#sh ver
System Mode: MLX
Chassis: NetIron 16-slot

--- FANS ---
Bottom fan tray (fan 1): Status = OK, Speed = MED (75%)
Bottom fan tray (fan 2): Status = OK, Speed = MED (75%)
Bottom fan tray (fan 3): Status = OK, Speed = MED (75%)
Bottom fan tray (fan 4): Status = OK, Speed = MED (75%)
Bottom fan tray (fan 5): Status = OK, Speed = MED (75%)
Bottom fan tray (fan 6): Status = OK, Speed = MED (75%)
Rev A Back Fan A (revision 0x0a): Status = OK, Speed = MED (75%)
Rev A Back Fan B (revision 0x0a): Status = OK, Speed = MED (75%)


In an MLXe-16 slot chassis, you will see the following output in the show chassis:
Example of old fans in MLXe chassis:

MLXe16#sh ver
System Mode: MLX
Chassis: MLXe 16-slot

--- FANS ---
Back Fan A-1: Status = OK, Speed = MED (60%)
Back Fan B-1: Status = OK, Speed = MED (60%)


Example of new fans in MLXe chassis (notice 4 fans listed instead of 2):

MLXe16#sh ver
System Mode: MLX
Chassis: MLXe 16-slot

--- FANS ---
Back Fan A-1: Status = OK, Speed = LOW (50%)
Back Fan A-2: Status = OK, Speed = LOW (50%)
Back Fan B-1: Status = OK, Speed = LOW (50%)

Back Fan B-2: Status = OK, Speed = LOW (50%)
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