| LOW VOLTAGE DIFFERENTIAL
(LVD, LVD/SE, Ultra2, Ultra3/160) - the NEW high speed 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)
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