User's Manual

Glossary
4Motion 922 System Manual
SNMP Simple Network Management Protocol. A network management protocol that
provides a means to monitor and control network devices, and to manage
configurations, statistics collection, performance, and security. SNMP works by
sending messages, called protocol data units (PDUs), to different parts of a network.
SNMP-compliant devices, called agents, store data about themselves in
Management Information Bases (MIBs) and return this data to the SNMP
requesters.
SSH Secure Shell is a protocol for secure remote login and other secure network services
over an insecure network.
TBS Target Base Station
TCP Transmission Control Protocol. Connection-oriented transport layer protocol that
provides reliable full-duplex data transmission. TCP is the part of the TCP/IP suite of
protocols that is responsible for forming data connections between nodes that are
reliable, as opposed to IP, which is connectionless and unreliable.
TCXO Temperature-Compensated crystal oscillator often used for frequency control in
tactical radios, telecom timing modules (Stratum 3 Type), wireless systems, and
reference oscillators.
TDD Time Division Duplex is a duplexing technique dividing a radio channel in time to
allow downlink operation during part of the frame period and uplink operation in the
remainder of the frame period.
TEK Traffic Encryption Key - a symmetric key that is used to encrypt/decrypt messages.
TFTP Trivial File Transfer Protocol. Simplified version of FTP that allows files to be
transferred from one computer to another over a network, usually without the use of
client authentication.
ToS Type of service. The method of handling traffic using information extracted from the
fields in the ToS byte to differentiate packet flows.
Tx Transmit
TUV TÜV is a safety-testing laboratory with headquarters in Germany. TÜV can test
products for compliance with IEC or VDE requirements. Products that have the TÜV
insignia have been tested by TÜV for compliance with applicable standards for sale
in the European market.
U Abbreviation for "Unit" or standard height measurement which defines the vertical
height for plug-in modules in the 19” construction system. One U equals 44.5 mm.
UCD Uplink Channel Descriptor.
UDP User Datagram Protocol. Connectionless transport layer protocol in the TCP/IP
protocol stack. UDP is a simple protocol that exchanges datagrams without
acknowledgments or guaranteed delivery, requiring that error processing and
retransmission be handled by other protocols. UDP is defined in RFC 768.
UGS Unsolicited Grant Service. Service supporting real-time applications generating
fixed-rate data such as voice over IP without silence suppression.