The Widest Variety of SCSI Terminators
All of our SCSI terminators are shielded and are designed and constructed to ANSI SCSI standards. A SCSI terminator must be placed on each end of the SCSI bus. SCSI terminator of different types must not be mixed.
When running SCSI devices, it is recommended that passive SCSI terminator be used on systems with a short bus, or systems that have only a few devices connected. Active SCSI terminator
provide optimum termination for SCSI II applications. SCSI III and Ultra SCSI require the new active negation terminators. These SCSI terminators are not the same as active SCSI terminators used on SCSI II, but they are downward compatible
We stock the entire spectrum of SCSI terminators to suit any and all of your SCSI terminator requirements:
How do I Choose the Right SCSI Terminator ?
This is probably one of the most common questions surrounding the SCSI interface.
In many applications, passive SCSI terminators have been used successfully. However, as clock rates and signal transition
speeds increase, and noise margins decrease, the SCSI passive terminator can no longer ensure a reliable signal.
To create a reliable signal with longer cable runs of up to 6 meters and higher data rates, you need active SCSI terminators.
Through the use of a voltage regulator, the terminator has immunity to Term-Power voltage variations. Additionally, the lower impedance of the active terminator, typically 110 ohms, more closely matches that of the cable.
If your cabling is in an electronically noisy environment or exceeds 6 meters, a better choice may be a forced perfect SCSI terminator. The resistors and diodes of a forced perfect terminator work together to push impedance higher and lower than the line impedance. This happens so quickly that it convinces the signal that it is seeing a perfect impedance match. Unfortunately, this performance comes at a price. The forced perfect terminator draws more current than is allowed per the ANSI SCSI specification and is not currently approved for use by all platforms.
If you are using differential drives and controllers you will need a differential terminator. The differential terminator has a resistor network that provides a reliable signal for cable lengths up to 25 meters.
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