Motorola MC21XX SERIES, Руководство пользователя

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Glossary - 8 MC21XX Series User Guide
Subnet Mask. A 32-bit number used to separate the network and host sections of an IP address. A custom subnet mask
subdivides an IP network into smaller subsections. The mask is a binary pattern that is matched up with the IP
address to turn part of the host ID address field into a field for subnets. Default is often 255.255.255.0.
Substrate. A foundation material on which a substance or image is placed.
Symbol. A scannable unit that encodes data within the conventions of a certain symbology, usually including start/stop
characters, quiet zones, data characters and check characters.
Symbol Aspect Ratio. The ratio of symbol height to symbol width.
Symbol Height. The distance between the outside edges of the quiet zones of the first row and the last row.
Symbol Length. Length of symbol measured from the beginning of the quiet zone (margin) adjacent to the start
character to the end of the quiet zone (margin) adjacent to a stop character.
Symbology. The structural rules and conventions for representing data within a particular bar code type (e.g. UPC/EAN,
Code 39, PDF417, etc.).
T
Tolerance. Allowable deviation from the nominal bar or space width.
U
UPC. Universal Product Code. A relatively complex numeric symbology. Each character consists of two bars and two
spaces, each of which is any of four widths. The standard symbology for retail food packages in the United States.
V
Visible Laser Diode (VLD). A solid state device which produces visible laser light.
W
WAN. Wide-Area Network. A radio network that supports data communication beyond a local area. That is, information
can be sent across a city, state, or even nationwide.
Warm Boot. A warm boot restarts the MC21XX by closing all running programs. All data that is not saved to flash
memory is lost.
WNMP. (Wireless Network Management Protocol) This is a proprietary MAC layer protocol used for inter access point
communication and other MAC layer communication.