                                                            8/25/89
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   ADAPTEC AHA-1640 PS/2 TO SCSI HOST ADAPTER EXTERNAL CONNECTOR

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NOTICE:  THIS IS PRELIMINARY AND ADAPTEC IS NOT RESPONSIBLE FOR
         ANY CHANGES, ERRORS, OR OMISSIONS TO THIS INFORMATION.
         THIS PUBLIC INFORMATION SHOULD NOT BE CONSTRUED AS A
         RECOMMENDATION BY ADAPTEC FOR ANY MANUFACTURER OR PART. 
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I)  LIST OF MANUFACTURERS AND PART NUMBERS OF CABLE CONNECTORS
         THAT MATE WITH THE EXTERNAL SCSI CONNECTOR
      ON THE ADAPTEC AHA-1640 PS/2 TO SCSI HOST ADAPTER
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     AMP           Connector Part No:      749111-4    
                   Back Shell Part No:     749193-1

     FUJITSU       Connector Part No:      FCN-237R050-G/F
                   Back Shell Part No:     FCN-230C050-D/E (or -C/E)

     HONDA         Connector Part No:      PCS-XE50MA
                   Back Shell Part No:     PCS- E50LA

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II)  INFORMATION ON THE RECOMMENDED EXTERNAL SCSI CABLE MATERIAL
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  Partial description of cable:  100% shielded
                                 25 twisted pairs
                                 90 - 135 ohm -> intrinsic impedence

     C&T           Cable Part No:          16035

     Madison       Cable Part No:          4099

(Both these cable materials are IPI type cables.  Approximately 120
ohms measured differential TDR.)


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III)  INFORMATION ON COMPANIES THAT MAKE COMPLETE CABLE ASSEMBLIES
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Some companies that manufacture complete cable assemblies are:

     Amphenol Interconnect Products, Endicott, New York
     contact Bill Sopchak at (607) 786-4370  or (607) 754-4444

     Quintec Interconnect Systems, San Jose, California
     contact Lon Hudson    at (408) 272-8000

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