Motorola MK1200, Руководство по продукции

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Glossary - 3
Decode Algorithm. A decoding scheme that converts pulse widths into data representation of the letters or
numbers encoded within a bar code symbol.
Decryption. Decryption is the decoding and unscrambling of received encrypted data. Also see,
Encryption and Key.
Depth of Field. The range between minimum and maximum distances at which a scanner can read a symbol
with a certain minimum element width.
DHCP. (Dynamic Host Configuration Protocol) Software that automatically assigns IP addresses to
client stations logging onto a TCP/IP network. Similar to BOOTP, but also permits the leasing
of an IP address. It eliminates having to manually assign permanent IP addresses. DHCP
software typically runs in servers and is also found in network devices such as routers that
allow multiple users access to the Internet.
DHCP Server. A server in the network or a service within a server that assigns IP addresses.
Discrete Code. A bar code or symbol in which the spaces between characters (intercharacter gaps) are not
part of the code.
Discrete 2 of 5. A binary bar code symbology representing each character by a group of five bars, two of
which are wide. The location of wide bars in the group determines which character is
encoded; spaces are insignificant. Only numeric characters (0 to 9) and START/STOP
characters may be encoded.
EAN. European Article Number. This European/International version of the UPC provides its own
coding format and symbology standards. Element dimensions are specified metrically. EAN
is used primarily in retail.
Element. Generic term for a bar or space.
Encoded Area. Total linear dimension occupied by all characters of a code pattern, including start/stop
characters and data.
ENQ (RS-232). ENQ software handshaking is also supported for the data sent to the host.
Encryption. Encryption is the scrambling and coding of data, typically using mathematical formulas called
algorithms, before information is transmitted over any communications link or network. A key
is the specific code used by the algorithm to encrypt or decrypt the data. Also see, Decryption
and Key.
ESD. Electro-Static Discharge
ESS_ID. Extended Service Set Identifier, defines the coverage area. Prior to the release of the 802.11
specification the ESS_ID was called the Net_ID or Network Identifier.
ESS_ID: 32 Alphanumeric characters, (case sensitive).
Flash Memory. Flash memory is responsible for storing the system firmware and is non-volatile. If the system
power is interrupted the data will not be lost.
Host Computer. A computer that serves other terminals in a network, providing such services as computation,
database access, supervisory programs and network control.
IEC. International Electrotechnical Commission. This international agency regulates laser safety
by specifying various laser operation classes based on power output during operation.