Ether232Plus User Guide Appendix A: Glossary of Terms and Acronyms
06-CML000027 Precidia Technologies Inc. A-3
IP Internet Protocol. The network layer for the TCP/IP protocol suite, widely used with
Ethernet networks. IP is a connectionless, best-effort packet switching protocol. It pro-
vides packet routing, fragmentation and re-assembly through the data link layer.
Defined in RFC791.
IPsec Internet Protocol Security. A protocol that provides security for transmission of sensi-
tive information over unprotected networks such as the Internet. IPsec acts at the net-
work layer, protecting and authenticating IP packets between participating devices
("peers"), such as routers.
LAN Local Area Network. A data communications network which is geographically limited
(typically to a 1 km radius), allowing easy interconnection of terminals, microproces-
sors and computers with adjacent buildings.
LRC Longitudinal Redundancy Checking. An error checking method that generates a parity
byte from a specified string or block of bytes.
LSB Least Significant Bit/Byte. Bit zero, the bit in a binary number giving the number of
ones, the last or rightmost bit.
MD5 Message Digest 5. An algorithm used to verify data integrity through the creation of a
128-bit message digest from data input. Defined in RFC1321.
MIB Management Information Base. A database of managed objects accessed by network
management protocols. An SNMP MIB is a set of parameters which an SNMP man-
agement station can query, or set, in the SNMP agent of a network device (e.g. router).
ms Milliseconds.
MSB Most Significant Bit/Byte. Bit n-1 in a binary number with n bits, the bit with the great-
est weight, the first, or leftmost bit.
PC Personal Computer.
PDU Protocol Data Units.
POS Point of Sale. Refers to financial transaction devices located directly in stores/busi-
nesses, where the customer pays directly from their account.
RFC Request For Comments. A series of technical documents and organizational notes
about the Internet. See http://www.rfc-editor.org/
RTS Request To Send. A modem signal line (pin 7 of DB-9 connectors), used for hardware
flow control. It is the counterpart to Clear To Send (CTS). When the unit is ready to
receive data, it sends the RTS signal to the remote host to start transferring data.
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