Appendix A: Glossary of Terms and Acronyms Ether232Plus User Guide
A-4 Precidia Technologies Inc. 06-CML000027
SNMP Simple Network Management Protocol. A set of protocols for managing complex net-
works. SNMP sends messages, protocol data units (PDUs), to different parts of a net-
work. SNMP-compliant devices, called agents, collect and store the data about
themselves in MIBs. The agents then return this data to the SNMP requesters. Defined
in RFC1157.
SNTP Simple Network Transport Protocol. Used to synchronize computer clocks on the
Internet. Defined in RFC1361. SNTP uses standard NTP timestamp format described
in RFC-1305.
SPI Security Parameters Index. A 32-bit value used to distinguish among IP packets using
IP security associations and arriving at the same destination.
STX Start of Text. Mnemonic for the ASCII 2 character, signaling the start of a text frame.
Subnet
mask
A bit mask used to identify which bits of an IP address correspond to the network
address, and subnet portions of the address. The subnet mask has ones in positions cor-
responding to the network and subnet numbers, and zeros in the host number posi-
tions.
TCP Transmission Control Protocol. TCP is the connection-oriented protocol built on top
of Internet Protocol (IP) and is nearly always seen in the combination TCP/IP (TCP
over IP). It adds reliable communication and flow-control and provides full-duplex,
process-to-process connections. Defined in RFC793.
TFTP Trivial File Transfer Protocol. A simple file transfer protocol used for many purposes
including downloading to diskless workstations.
UART Universal Asynchronous Receiver-Transmitter. A computer component (chip) that
handles asynchronous serial communication.
UDP User Datagram Protocol. A connectionless protocol that, like TCP, runs on top of an
IP network. Unlike TCP, UDP provides no error recovery services, offering instead, a
direct way to send and receive datagrams over an IP network.
URL Uniform Resource Locator. The global address of documents and other resources on
the global Internet.
VPN Virtual Private Network.
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