Infortrend S12 Series Hardware Manual page 106

Type I Expansion Connection
Physical connections from RAID to JBODs:
IN OUT
Single controller systems
EonStor / EonStor DS S12/S16/S24 Series
CH0 CH1 CH2 CH3
106
IN IN
OUT OUT
Dual controller systems
CH0 CH1 CH2 CH3
CH0 CH1 CH2 CH3