SAS-216EL Backplane User's Guide 2-2 Rear Connector and Pin Defi nitions 1. Primary Flash Chips The Primary Flash Chip enhances the back- plane memory. 2. Expander Chips This Expander Chip allows the backplane to support dual ports, cascading, and failover. 3. - 5. SAS Ports The primary and secondary sets of SAS ports provide expander features including cascading and failover From right to left the ports are Primary 1/2/3 and Second- ary 1/2/3. 6. EPP Ports The EPP ports are used for manufacturer diagnostic purposes only. 7. Fan Connectors The 3-pin connectors, designated FAN1, FAN2, and FAN3, provide power to the fans. See the table on the right for pin defi nitions. 8.
Backplane Main Power Connectors The 4-pin connectors, designated PWR1, PWR2, PWR3, PWR4, PWR5, and PWR6, provide power to the backplane. See the table on the right for pin defi nitions. 2-2 Fan Connectors Pin# Defi nition 1 Ground 2 +12V 3 Tachometer Backplane Main Power 4-Pin Connector Pin# Defi nition 1 +12V 2 and 3 Ground 4 +5V