Glossary - 5
O
ODI. See Open Data-Link Interface.
Open Data-Link Interface (ODI). Novell’s driver
specification for an interface between network
hardware and higher-level protocols. It supports
multiple protocols on a single NIC (Network Interface
Controller). It is capable of understanding and
translating any network information or request sent by
any other ODI-compatible protocol into something a
NetWare client can understand and process.
Open System Authentication. Open System
authentication is a null authentication algorithm.
P
PAN . Personal area network. Using Bluetooth wireless
technology, PANs enable devices to communicate
wirelessly. Generally, a wireless PAN consists of a
dynamic group of less than 255 devices that
communicate within about a 33-foot range. Only
devices within this limited area typically participate in
the network.
Parameter. A variable that can have different values
assigned to it.
Percent Decode. The average probability that a single
scan of a bar code would result in a successful
decode. In a well-designed bar code scanning
system, that probability should approach near 100%.
Print Contrast Signal (PCS). Measurement of the
contrast (brightness difference) between the bars and
spaces of a symbol. A minimum PCS value is needed
for a bar code symbol to be scannable. PCS = (RL -
RD) / RL, where RL is the reflectance factor of the
background and RD the reflectance factor of the dark
bars.
Programming Mode. The state in which a scanner is
configured for parameter values. See Scanning
Mode.
Q
Quiet Zone. A clear space, containing no dark marks,
which precedes the start character of a bar code
symbol and follows the stop character.
QWERTY. A standard keyboard commonly used on North
American and some European PC keyboards.
“QWERTY” refers to the arrangement of keys on the
left side of the third row of keys.
R
Reflectance. Amount of light returned from an illuminated
surface.
Resolution. The narrowest element dimension which is
distinguished by a particular reading device or printed
with a particular device or method.
RF. Radio Frequency.
RS-232. An Electronic Industries Association (EIA)
standard that defines the connector, connector pins,
and signals used to transfer data serially from one
device to another.
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