Motorola MC50 T, U, V

TCP/IP. (Transmission Control Protocol/Internet Protocol) A communications protocol used to internetwork

dissimilar systems. This standard is the protocol of the Internet and has become the global standard for

communications. TCP provides transport functions, which ensures that the total amount of bytes sent is

received correctly at the other end. UDP is an alternate transport that does not guarantee delivery. It is

widely used for real-time voice and video transmissions where erroneous packets are not retransmitted. IP

provides the routing mechanism. TCP/IP is a routable protocol, which means that all messages contain not

only the address of the destination station, but the address of a destination network. This allows TCP/IP

messages to be sent to multiple networks within an organization or around the 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 progr am.

Terminal. See Mobile Computer.

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 MC9000 Se ries

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.

Tolerance. Allowable deviation from the nominal bar or space width.

Transmission Control Protocol/Internet Protocol. See TCP/IP.

Trivial File Transfer Protocol. See TFTP.

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.

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.

Visible Laser Diode (VLD). A solid state device which produces visible laser light.