Active external SCSI terminator, HD50

Increase the reliability and bandwidth of your SCSI chain.

Simply replace your existing terminator with this device!
LED indicates correct operation.

High Density, 50 pin.

A terminator is a set of resistors placed at each end of a transmission line, such as the SCSI (small systems computer interface) bus. Terminators help to prevent signal reflections at the ends of the transmission line and ensures that the signal on the line quickly reaches its desired state. A correctly terminated SCSI bus supports faster and more reliable operation. Each end of the physical SCSI bus should have one SCSI terminator attached.

Physically, there are two types of terminators: internal and external. There are no electrical differences between these two terminator types. An external terminator looks like a SCSI bus connector without any cable attached to it. An internal terminator usually consists of two or three resistor SIPs (single in-line packages). On some new SCSI devices, the internal terminator is controlled by a switch or jumper on the device. For more information on internal termination in such devices, please refer to the device documentation.

Electrically, there are two types of terminators: passive and active. Passive terminators were defined in the SCSI-I standard and are in widespread use today. A passive terminator is just a set of resisters. If you do not know what type terminator your device uses and it is not marked, it most likely uses a passive terminator. An active terminator includes active components, such as transistors, along with resistors. Active terminators were defined in the SCSI-II standard and are fairly new. Active terminators provide better termination response and support faster, more reliable bus operation. Some of the newer and faster controllers should have active terminators. Installing active terminators is a simple hardware modification that solves many SCSI bus problems.
 

Weight (including postal packaging) 38g
(Royal Mail First Class signed for £1.02)

click for larger images