IBM DCS9550 1S1 - Manual (Page 37)

Installation
22 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
Figure 2–6 DCS9550 1S1 Storage Expansion Unit: Unit #2 Cabling
Unit 2— A
Unit 2— B
Unit 2— D
Unit 2— E
Unit 2— C
Unit 2— F
Unit 2— G
Unit 2— H
Unit 2— P
Unit 2— S