What does TFSC stand for?

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Greetings!!

I own a outdated Dell GXMT 5200 computer. Unfortunately, the power supply went down. It is a Liton (Taiwan) PS-5231-1-1 Rev.4, and the pin layout is as follows:

Color Signal Pin Pin Signal Color
Gray /PS_On 11 1 +5V Red
Black GND 12 2 GND Black
Black GND 13 3 +5V Red/Black
Black GND 14 4 GND Black
White -5V 15 5 Power_Good Orange
Red +5V 16 6 +5VSB Purple
Red +5V 17 7 +12V Yellow
Red +5V 18 8 -12V Blue
Brown TFSC 19 9 GND Black
Red +5V 20 10 GND Black

I am trying to repair it, but I don't know what does TFSC stand for; what is its voltage;
polarity, and current.

Any help is appreciated.

Thank you.
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[kawal]

What is TFSC

TFSC = thermal fan speed control its the reading for RPMs of the power supply fan.
All the Dell workstation PS have this function for making sure the PS fan is running.