140 PERC 3/ QC H a r d war e Ins ta l lati onw w w . d e l l . c o m | s u p p o r t . d e l l . c o mJ23 External BatteryJ23 is a 5-pin connector that attaches to the optional battery pack. Table 10-7 displays the J23 pinout.Step 4—Set SCSI TerminationYou must terminate the SCSI bus properly. Set termination at both ends ofthe SCSI cable. The SCSI bus is an electrical transmission line and must beterminated properly to minimize reflections and losses. Termination shouldbe set at each end of the SCSI cable(s), as shown below. Termination isalways enabled, regardless of the configuration. However, you can overridethis setting by setting another state. The Dell default is termination byjumper. Figure 10-3 displays an example of termination.Ta b l e 1 0 - 6 . J 1 9 O n b o a r d B I O S E n a b l e S e t t i n g sJ19 Setting Onboard BIOS StatusUnjumpered EnabledJumpered DisabledTa b l e 1 0 - 7 . J 2 3 E x t e r n a l B a t t e r y P i n o u tPin Description1 +BATT Terminal (red wire)2 Thermistor (white wire)3 -BATT Terminal (black wire)4 BATDQ (no wire)5 Ground (no wire)
