"We offer a wide variety of SCSI Terminators to optimize the performance of your SCSI bus - from the popular passive and active terminators for single-ended SCSI applications, to the active negation and hard-to-find, premium-quality forced perfect terminators. Picking the right terminator is vital to the performance of your SCSI chain. A passive terminator is simply a resistor network designed to regulate the impedance in the line, while an active terminator uses a voltage regulator to optimize signal voltage. Active termination is always preferred over passive, and most Cables To Go Active Terminators feature an LED to monitor terminator power line status. Before you can connect your expensive SCSI equipment, make sure you make the right connection with a Cables To Go Terminator! Connector: SCSI-1 Centronics 50-pin. Termination: Active. Designed For: For external SCSI-1 end-of-line termination."