IBM 6C4 - Manual (Page 26)

Operator Panel
1 Power-On Button 6 Operator Panel Display
2 Power-On LED 7 (FS1) Front Serial
Connector (RJ48 Connector)
3 Attention LED 8 Service Processor Reset
Switch (Pinhole)
4 SCSI Port Activity LED 9 System Reset Button
5 Ethernet Port Activity LED
8 pSeries 630 Model 6C4 and Model 6E4 User’s Guide