SCSI Terminator Selector Chart
Use the following chart to determine which terminator you require....Click
Picture to see larger version
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LVD/SE
TRM-8900
TRM-8900L (w/LED)
TRM-1964 Pass-Thru M/F
Active Negation - Link to definition Active - Link to definition
TRM-8655
Differential - Link to definition Passive
TRM-8652
FPT-27 - Link to definition
TRM-8654
-
LVD/SE
TRM-8920
Active - Link to definition
TRM-8670
Differential - Link to definition
TRM-8671
-
(Permanently attached to the cable. It is usually ordered with a
cable assembly or crimped on by the User)
LVD/SE
TRM-8910
Differential - Link to definition
TRM-8662
-
LVD/SE
TRM-8915
-
Active - Link to definition
TRM-8658
Differential - Link to definition
TRM-8659
-
Active - Link to definition
TRM-8664
Differential - Link to definition
TRM-8665
-
Active - Link to definition
TRM-8656
Differential - Link to definition
TRM-8657
-
Active Negation - Link to definition
TRM-8526
TRM-8527 (w/LED)
Differential - Link to definition
TRM-8530
Passive - Link to definition
TRM-8525
FPT-27 - Link to definition
TRM-8529
-
Active Negation - Link to definition
TRM-8510
TRM-8511 (w/LED)
Differential - Link to definition
TRM-8514
Passive - Link to definition
TRM-8501 (w/LED)
FPT-27 - Link to definition
TRM-8511 (w/LED)
-
Active - Link to definition
TRM-8540
-
Active - Link to definition
TRM-8543
-
(Permanently attached to the cable. It is usually ordered with a
cable assembly or crimped on by the User)
Active - Link to definition
TRM-8542
-
Active - Link to definition
TRM-8222
-
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 Definition
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. Return to top
ACTIVE Definition
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.
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DIFFERENTIAL Definition
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.
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PASSIVE Definition
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.
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FORCED PERFECT Definition (FPT)
Utilizes a circuit containing a resistor/diode combination to create an
impedance matching terminator.
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FPT Definition 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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