Manual

Appendix A: Glossary of Terms and Acronyms iPocket232 User Guide
A-4 Precidia Technologies Inc. 23-CML000293
MIB Management Information Base. A database of managed objects accessed by net-
work management protocols. An SNMP MIB is a set of parameters which an
SNMP management 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
greatest 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/
businesses, where the customer pays directly from their account.
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 hard-
ware 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 transfer-
ring data.
SNMP Simple Network Management Protocol. A set of protocols for managing complex
networks. SNMP sends messages, protocol data units (PDUs), to different parts
of a network. SNMP-compliant devices, called agents, collect and store the data
about themselves in MIBs. The agents then return this data to the SNMP request-
ers. Defined in RFC1157.
SPI Security Parameters Index. An optional 32-bit field found in an SRTP packet. It
is used to distinguish among IP packets using IP security associations.
STX Start of Text. Mnemonic for ASCII 2, character that signals 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 posi-
tions corresponding to the network and subnet numbers, and zeros in the host
number positions.
SVC Switched Virtual Circuit. A temporary virtual circuit that is set up and used only
as long as data is being transmitted. Once the communication between the two
hosts is complete, the SVC disappears.