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GB1400 User Manual glossary-1
Glossary
Address
A number specifying a particular user device attachment point... The location of
a terminal, a peripheral device, a node, or any other unit or component in a
network...A set of numbers than uniquely identifies something - a location in
computer memory, a packet of data traveling through a network.
Analog-to-Digital Converter
A device that converts an analog signal, that is, a signal in the form of a
continuously variable voltage or current, to a digital signal, in the form of bits.
Attenuation
A decrease in magnitude of current, voltage, or power of a signal in transmission
between points.
Attenuator
An electronic transducer, either fixed or adjustable, that reduces the amplitude of
a wave without causing significant distortion.
Bandwidth
The difference between the limiting frequencies of a continuous frequency
spectrum. The range of frequencies handled by a device or system.
BER
An acronym for Bit Error Ratio (or Rate). The principal measure of quality of a
digital transmission system. BER is defined as:
BER = Number of Errors/Total Number of Bits
BER is usually expressed as negative exponent. For example, a BER of 10
-7
means that 1 bit out of 10
7
bits is in error.
BER Floor
A limiting of the bit-error-ratio (BER) in a digital fiber optic system as a function
of received power due to the presence of signal degradation mechanisms or
noise.
Binary
A numbering system that allows only two values, zero and one, (0 and 1). Binary
is the way most computers store information., in combination of ones and zeros.
Voltage on. Voltage off. See also: Bit.
Bit
A binary digit, the smallest element of information in binary system. A 1 or 0 of
binary data.
Bit Error
An incorrect bit. Also known as a coding violation.