Appendix A: Glossary of Terms and Acronyms Ether232Plus User Guide
A-2 Precidia Technologies Inc. 06-CML000027
DES Data Encryption Standard. A standard cryptography method that uses a 56-bit private
key. DES performs encryption operations on 64-bit blocks of data in 16 rounds. DES
was developed by IBM in 1977 and was considered “strong” encryption.
3DES TripleDES provides even stronger encryption than DES, by extending the 56-bit pri-
vate key to 192 bits.
DHCP Dynamic Host Configuration Protocol. A protocol for assigning dynamic IP addresses
to devices on a network.
DLE Data Link Escape. Mnemonic for ASCII 16, a transmission control character that
changes the meaning of a limited number of contiguously following characters or
coded representations.
DSR Data Set Ready. A modem signal line (pin 6 of DB-9 connectors), used for RS-232
hardware flow control. It is the counterpart to Data Terminal Ready (DTR).
DSU Data Service Unit. A device that connects a terminal or computer to a digital line.
DTE Data Terminal Equipment. The interface used to exchange between computers.
DTR Data Terminal Ready. A modem signal line (pin 4 of DB-9 connectors), used for RS-
232 hardware flow control. It is the counterpart to Data Set Ready (DSR).
Ethernet An industry standard local area network architecture that serves as the basis for IEEE
802.3. Ethernet uses a bus or star topology and supports data transfer rates of 10 and
100 Mbps.
ETX End of Text. Mnemonic for the ASCII 3 character, signaling the end of a text frame.
Gateway A device that enables data to flow between different networks, forming an internet. In
this case, a router connects two broadcast networks at the IP layer 3.
Hex Hexadecimal. It refers to a base-16 numbering system, as opposed to binary, which is a
base-2 numbering system. Hexadecimal numbers consist of numbers 0-9, and letters
A-F. Hexadecimal numbering is commonly used to express 8-bit binary numbers. One
hexadecimal digit can represent the arrangement of four binary digits. Two hexadeci-
mal digits can represent eight binary digits, or a byte.
ICMP Internet Control Message Protocol. An extension to IP, ICMP supports packets con-
taining error, control, and informational messages. Defined in RFC792.
ID Identification/Identifier/Identity.
IEEE Institute of Electrical and Electronic Engineers.
I/O Input/Output.
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