External ConnectorShielded 50-pin high density (Alternative 1) connector as specified in proposed ANSIstandard X3T9.2/86-109 Revision 10h, Section 4, Figure 5.For connector pin out, see Appendix B.Partial list of compatible connector plugs or cable assemblies (for reference only):Manufacturer Model Part NumberAMP Connector 749111-4Back Shell 749193-1Fujitsu Connector FCN-237R050-G/FBack Shell FCN-230C050-D/E or -C/EHonda Connector PCS-XE50MABack Shell PCS-E50LACable for external SCSI connector should be good quality 100% shielded round cablewith 25 twisted pairs. Each pair should have a characteristic impedance (Z 0 ) between90 ohms and 135 ohms. Wire gauge may be 26 or 28 AWG. All pairs should have thesame impedance and should have the same delay per length of cable. Cables meetingthese requirements will normally operate correctly in any SCSI configuration andshould normally meet all FCC requirements.For best results, the SCSI committee recommends that SCSI connectors should notbe placed less than one foot apart on internal (ribbon) cable or on external cablewhen using Fast SCSI 10 Mbytes/second data transfers.Cable material which meets this specification is available from a number of vendors,including:Manufacturer Part Number PhoneC&T 16035Madison 4099 (508) 752-7320Complete cable assemblies are available from a number of manufacturers. Amongthem are:Manufacturer PhoneAmphenol Interconnect Products (607) 786-4370Lynn Products Inc. (800) 634-5093Quitec Interconnect Systems (408) 272-8000Icontec (408) 945-7766Enhance Cable Technology (408) 293-2425adaptec AHA-1740A/1742A/17441- 8
