Symbol MC9090G User Manual page 236

Glossary - 12 MC909X Mobile Computer User Guide
world, hence its use in the worldwide Internet. Every client and server in a TCP/IP network requires an IP address, which
is either permanently assigned or dynamically assigned at startup.
Telnet. A terminal emulation protocol commonly used on the Internet and TCP/IP-based networks. It allows a user at a
terminal or computer to log onto a remote device and run a program.
Terminate and Stay Resident (TSR). A program under DOS that ends its foreground execution to remain resident in
memory to service hardware/software interrupts, providing background operation. It remains in memory and may
provide services on behalf of other DOS programs.
Terminal Emulation. A "terminal emulation" emulates a character-based mainframe session on a remote non-mainframe
terminal, including all display features, commands and function keys. The MC909X Series supports Terminal Emulations
in 3270, 5250 and VT220.
TFTP. (Trivial File Transfer Protocol) A version of the TCP/IP FTP (File Transfer Protocol) protocol that has no directory or
password capability. It is the protocol used for upgrading firmware, downloading software and remote booting of diskless
devices.
TKIP. (Temporal Key Integrity Protocol) A wireless encryption protocol that periodically changes the encryption key, making
it harder to decode.
Tolerance. Allowable deviation from the nominal bar or space width.
Transmission Control Protocol/Internet Protocol. See TCP/IP.
TLS. (Transport Layer Security) TLS is a protocol that ensures privacy between communicating applications and their users
on the Internet. When a server and client communicate, TLS ensures that no third party may eavesdrop or tamper with
any message. TLS is the successor to the Secure Sockets Layer (SSL).
Trivial File Transfer Protocol. See TFTP.
TSR. See Terminate and Stay Resident.
U
UPC. (Universal Product Code) A relatively complex numeric symbology. Each character consists of two bars and two
spaces, each of which is any of four widths. The standard symbology for retail food packages in the United States.
UDP. (User Datagram Protocol) A protocol within the IP protocol suite that is used in place of TCP when a reliable delivery
is not required. For example, UDP is used for real-time audio and video traffic where lost packets are simply ignored,
because there is no time to retransmit. If UDP is used and a reliable delivery is required, packet sequence checking and
error notification must be written into the applications.
U
Visible Laser Diode (VLD). A solid state device which produces visible laser light.