Chassis SC822 User's Manual Front Connectors and LEDs The following connectors are on the side of the backplane that faces the front of the chassis. They are identified by silkscreen labels. JP1 JP4 JP2 JP9 FAIL LED ACT LED JP3 JP11 Figure C-3. Front Connectors The backplane holds connectors for the SAS hard disk drives. It also contains two LED status indicators for each drive. 64 Drive Connectors and LED Indicators Drive Number Label HDD Activity LED (blue) HDD Failure LED (red) (823TQ only) SAS #0 J1 D12 D5 SAS #1 J2 D13 D6 SAS #2 J3 D14 D7 SAS #3 J4 D15 D8 SAS #4 J9 D18 D19 SAS #5 J11 D21 D20