SAF-TE

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A SCSI Accessed Fault-Tolerant Enclosure is an industry standard to interface an enclosure to a (parallel) SCSI subystem to gain access to information or control concerning

temperature
fan status
slot status
door status
power supplies
alarms
indicators (e.g. LEDs, LCDs)

The most widely used version was defined in 'SAF-TE Interface Specification Intermediate Review R041497 April 14, 1997' by nStor and Intel.

A SAF-TE device is represented as a SCSI processor device. For SAS or Fibre Channel systems, SAF-TE is replaced by standardized SCSI Enclosure Services.