Glossary - 9
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 mobile computer by closing all running programs. All data that is not saved to flash
memory is lost.
Wireless Local Area Network (WLAN). See LAN.
Wireless Wide Area Network (WWAN). See WAN.
WNMP. (Wireless Network Management Protocol) This is Symbol’s proprietary MAC layer protocol used for inter access
point communication and other MAC layer communication.
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