Electrical termination
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Electrical termination of a signal involves providing a terminator at the end of a wire or cable to prevent an RF signal from being reflected back from the end, causing interference. The terminator is placed at the end of a transmission line or daisy chain bus (such as in SCSI), designed to match impedance and hence minimize signal reflections.
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[edit] Types of terminators
[edit] Simple resistor
Often the terminator is a resistor. There are also active terminators which contain an electric circuit to perform the same basic function.
[edit] Dummy loads
Dummy loads are commonly used in HF to EHF frequency circuits.
[edit] 50 ohm
10BASE2 networks absolutely must have proper termination with a 50 ohm BNC terminator. If the bus network is not properly terminated, too much power will be reflected, causing all of the computers on the bus to lose network connectivity.
[edit] 75 ohm
A terminating resistor for a television cable is often in the form of a cap, threaded to screw onto an F connector.
[edit] Other meaning
Electrical termination sometimes refers to manufacturing operations which connect wires together. This includes crimping, soldering, and related operations. See electrical connector.
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