Terminator type for SCSI-2 Fast/Wide Single Ended
Env: AIX 3.2.5, Model 980b, Seagate external SCSI drive
Desc: Customer needs to know if he should use a Passive,
Active, or Forced Perfect Terminator to connect his
Seagate 4Gb drive which is connected to his SCSI-2
Fast/Wide SE adapter.
Action: The terminator that is needed is 52G9907. This is a
forced perfect terminator (FPT-18+).
In June 1991, IBM introduced Forced Perfect Termination
(FPT) terminators. These terminators lifted the
restriction so that the full seven devices could be
attached to the SCSI bus. All terminators shipped since
mid-1991 use this active termination technique.
non-FPT: a terminator that uses the older passive method of
termination. Internal/External SCSI bus was limited
to two external devices.
FPT-3 : a terminator that actively terminates only three of
the SCSI bus lines: ACK, REQ, SEL.
FPT-18 : a terminator that actively terminates 18 lines of the
SCSI bus, including the eight data lines. This
terminator is no longer manufactured.
FPT-18+: a terminator that actively terminates 18 lines of the
SCSI bus. This terminator replaces the FPT-18. This
FPT is functionally equivalent to the FPT-18 and is
fully interchangeable with the FPT-18.
The SCSI-2 F/W Single Ended adapter uses the FPT-18+ termination
on the external bus and FTP-3 termination on the internal bus.
Support Line: Terminator type for SCSI-2 Fast/Wide Single Ended ITEM: Q7884L
Dated: January 1995 Category: N/A
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