Appendix D: SAS-846EL Backplane Specifications
D-9 Dual Port and Cascading Configurations
The following section contains cascading configurations for the SC846EL1 and
SC846EL2 backplanes.
D-10 Single and Dual Port Expanders
Single Ports
SAS-846EL1 backplanes have a single-port expander that access all twenty-four
drives and supports cascading.
Dual Ports
SAS-846EL2 backplanes have dual-port expanders that access all twenty-
four drives. These dual-port expanders support cascading, failover, and multipath.
PRI_F L
ASH1
J2
J2
J1
Port B
Secondary Ports
Expander 2
From HBA or higher
backplane
To lower backplane in
cascaded system
To lower backplane in
cascaded system
Port A
Primary Ports
Expander 1
From HBA or higher
backplane
J0
J1
J0
Figure D-4: SAS-846EL2 Dual Port Configuration
From HBA or higher
backplane
Port A
Primary Ports
Expander 1
Figure D-5: SAS-846EL1 Single Port Configuration
PRI_F L
ASH1
J2
J1
To lower backplane in
cascaded system
J0
D-11
