The Widest Variety of Terminators
All of our SCSI terminators are shielded and are designed and constructed to ANSI SCSI standards.
A terminator must be placed on each end of the SCSI bus. Terminators of different types must not be mixed.
When running SCSI devices, it is recommended that passive terminators be used on systems with a short bus, or systems that have only a few devices connected. Active terminators provide optimum
termination for SCSI II applications. SCSI III and Ultra SCSI require the new active negation terminators. These terminators are not the same as active 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 requirements:
Low Voltage Differential, LVD SCSI Terminators
SCSI Workstation Terminators
Feed-Thru Active & Differential
Active Internal Terminators
Active Negation Terminators
SCSI Adapters 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 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 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. |
