DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch 16 4 by 4 slot 22-bit backplane with card guide is a Q-bus that will accept eight dual- or four quad-height boards on slots A/B and C/D. The H9270 is compatible with the RLV12 and RLV22 options. DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch 16 4-by-9-slot backplane with card guide is a Q-bus which will ac- cept up to nine dual- or quad-height boards on slots A/B and a special module interconnect bus on slots C/D. The H9273 is compatible with the RLV21 and RLV22 options. DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch 16 The DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch 16 4-by-9-slot backplane with card guide is a nonex- pandable backplane with 22-bit addressing and built-in bus ter- minators. It contains the 22-bit addressing on slots A/B and C/D and will accept 18 dual- or nine quad-height boards. It is compatible with the RLV12 and RLV22 options. DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch 16 A family of three 18- or 22-bit backplanes with card guides. H9281-QA 2 by 4 slot backplane where the Q-bus on slots A/B accepts up to four dual-height modules. DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch 16 2 by 8 slot backplane with built-in bus terminators, and the Q-bus on slots A/B accepts up to eight dual-height boards. DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch DS-DSGGA-AB StorageWorks Fibre Channel Storage Switch 16 16 2 by 12 slot backplane which includes bus terminators. The Q-bus on slots A/B accepts up to 12 dual-height boards.