5-33 
5 Appendix D Cooling system 
To dissipate heat timely and enhance system stability, the switch uses a high-performance cooling 
system. Consider the site ventilation design when you plan the installation site for the switch. 
The switch uses removable fan trays. They provide airflow from the port side to the power supply 
side or from power supply side to the port side by using different types of fan trays. You must install 
all fan trays of the same model for the switch. Table5-1 describes fan trays available for the switch. 
Table5-1 Fan trays available for the switches 
Device model  Fan tray  Airflow direction 
S6520X-30QC-EI 
S6520X-54QC-EI 
S6520X-30HC-EI 
S6520X-54HC-EI 
S6520X-30QC-HI 
S6520X-54QC-HI 
S6520X-30HC-HI 
S6520X-54HC-HI 
LSWM1FANSCE 
From the power supply side to the port side and 
chassis sides 
LSWM1FANSCBE 
From the port side and chassis sides to the power 
supply side 
S6520X-30HF-EI 
S6520X-54HF-EI 
S6520X-30HF-HI 
S6520X-54HF-HI 
LSPM1FANSA-SN  From the power supply side to the port side 
LSPM1FANSB-SN  From the port side to the power supply side 
 
Figure5-1 Airflow direction (S6520X-54QC-EI) 
 
 
LS W M 1FA N SC E
LS W M 1FA N SC B E