The fan tray is at the left of the service subrack and blows air for heat dissipation of the service subrack. The cool air flows to the subrack from the left of the subrack and then is exhausted from the right of the subrack after passing the boards.
The fan tray is configured with a fan monitoring board. The fan monitoring board transmits speed adjustment signals to the fan tray, collects the rotating speed signals of the fans, and reports the rotating speed signals to the control board.
The rotating speed of the fans can be adjusted according to the detected temperature automatically or be adjusted by software manually.