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 f eet). 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 5 3 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 2 7 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