ASROCK EP2C612D16T-4L User Manual page 31

Chassis ID0 Jumper
(3-pin CHASSIS_ID0)
(see p.6, No. 49)
Chassis ID1 Jumper
(3-pin CHASSIS_ID1)
(see p.6, No. 48)
Chassis ID2 Jumper
(3-pin CHASSIS_ID2)
(see p.6, No. 50)
Reserved for system level
use
EP2C612D16T-4L
Reserved for system level
use
25