Motorola VC70N0 Product Reference Manual page 190

Glossary - 6 VC70 Vehicle Computer Product Reference Guide
Substrate. A foundation material on which a substance or image is placed.
T
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 vehicle computer emulation protocol commonly used on the Internet and TCP/IP-based networks. It allows a user
at a vehicle computer or computer to log onto a remote device and run a program.
Terminal Computer Emulation. A "terminal computer emulation" emulates a character-based mainframe session on a
remote non-mainframe terminal computer, including all display features, commands and function keys. The VC70 Series
supports Terminal Computer 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 upgradi n g 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.
U
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.
V
VC. Vehicle Computer.
Vehicle Computer. In this text, vehicle computer refers to the VC70 vehicle computer. It can be set up to run as a
stand-alone device, or it can be set up to communicate with a network, using wireless radio technology.