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SCSI protocol for transfer rates up to 160Mb/s adds speed, distance, and connectivity to the SCSI bus. Requires LVD or LVD/SE (multi-mode) termination.
*ACTIVE NEGATION - similar to ACTIVE, but uses a more complex circuit to ensure a stabilized voltage level supply, thereby allowing for a cleaner, noise-free SCSI signal. Active Negation is the accepted standard of termination for Ultra SCSI.
*ACTIVE - also known as regulated or Alt II, incorporates a voltage regulator circuit to supply a regulated voltage level to the terminating resistors, is considered a much more reliable terminator than the passive, and is used on FAST SCSI devices.
*DIFFERENTIAL - used exclusively for HVD High Voltage Differential SCSI drive subsystems, is available for either 50-pin (narrow) SCSI or 68-pin (wide) SCSI. Utilizes a 150/330 ohm resistor circuit to terminate. Allows for longer SCSI bus lengths.
*PASSIVE - considered the low end of SCSI termination performance, with a series of 220/330 ohm terminating resistors. Typically used on SCSI-1 and slower SCSI-2.
*FORCED PERFECT (FPT) - utilizes a circuit containing a resistor/diode combination to create an impedance matching terminator.
*FPT 18-Line - has FPT circuitry on all 18 signal
lines, and is also regulated. (for 50-pin single-ended SCSI only) 8
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