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Glossary-6
VRC 6940 Product Reference Guide
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An electronic device used to scan bar code symbols and produce a digitized pattern that
corresponds to the bars and spaces of the symbol. Its three main components are:
1. Light source (laser or photoelectric cell) - illuminates a bar code.
2. Photodetector - registers the difference in reflected light (more light reflected from
spaces).
3. Signal conditioning current - transforms optical detector output into a digitized bar
pattern.
Spectrum24
Symbol’s frequency-hopping, spread spectrum cellular network.
Spread Spectrum
A technique for uniformly distributing the information content of a radio signal over a
frequency range larger than normally required for robust transmission of data. Spreading the
signal without adding additional information adds significant redundancy, which allows the
data to be recovered in the presence of strong interfering signals such as noise and jamming
signals. This is its primary advantage.
Subnet
A subset of nodes on a network that are serviced by the same router. Refer to Router.
SVTP
Symbol Virtual Terminal Program.
Terminal
A Symbol portable computer product.
Terminal IP Address
The terminal’s network address. Networks use IP addresses to determine where to send data
that is being transmitted over a network. An IP address is a 32-bit number referred to as a
series of 8-bit numbers in decimal dot notation (e.g., 130.24.34.03). The highest 8-bit
number you can use is 254.
TFTP
Trivial File Transfer Protocol.