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User’s Guide 21020285 D
Appendix B Cables and Connectors
SCSI Connector Page B - 3
SCSI
Connector
The RF3880 supports the differential SCSI interface by use of the 68-pin “P”
cable connector. Its connector pin-outs are as shown in the table below.
Maximum
Cable Length
Maximum cable length for differential operation is 25 meters (or 82 feet). This
length includes internal cabling and cable stubs.
Signal Name Pin Number Cable Conductor Number Pin Number Signal Name
+DB (12) 1 1 2 35 -DB (12)
+DB (13) 2 3 4 36 -DB (13)
+DB (14) 3 5 6 37 -DB (14)
+DB (15) 4 7 8 38 -DB (15)
+DB (P1) 5 9 10 39 -DB (P1)
Ground 6 11 12 40 Ground
+DB (0) 7 13 14 41 -DB (0)
+DB (1) 8 15 16 42 -DB (1)
+DB (2) 9 17 18 43 -DB (2)
+DB (3) 10 19 20 44 -DB (3)
+DB (4) 11 21 22 45 -DB (4)
+DB (5) 12 23 24 46 -DB (5)
+DB (6) 13 25 26 47 -DB (6)
+DB (7) 14 27 28 48 -DB (7)
+DB (P) 15 29 30 49 -DB (P)
Diffsens 16 31 32 50 Ground
Termpwr 17 33 34 51 Termpwr
Termpwr 18 35 36 52 Termpwr
Reserved 19 37 38 53 Reserved
+ATN 20 39 40 54 -ATN
Ground 21 41 42 55 Ground
+BSY 22 43 44 56 -BSY
+ACK 23 45 46 57 -ACK
+RST 24 47 48 58 -RST
+MSG 25 49 50 59 -MSG
+SEL 26 51 52 60 -SEL
+C/D 27 53 54 61 -C/D
+REQ 28 55 56 62 -REQ
+I/O 29 57 58 63 -I/O
Ground 30 59 60 64 Ground
+DB (8) 31 61 62 65 -DB (8)
+DB (9) 32 63 64 66 -DB (9)
+DB (10) 33 65 66 67 -DB (10)
+DB (11) 34 67 68 68 -DB (11)
Table 121: Cable Connector Pin-outs for the RF3886