Symbol Technologies VC5090 - Manual (Page 200)

Glossary - 6 VC5090 Vehicle Computer Product Reference Guide
SMDK.
Symbol Mobility Developer’s Kit.
Soft Reset.
See Warm Boot.
Subnet.
A subset of nodes on a network that are serviced by the same router. See Router.
Subnet Mask.
A 32-bit number used to separate the network and host sections of an IP address. A custom subnet mask
subdivides an IP network into smaller subsections. The mask is a binary pattern that is matched up with the IP
address to turn part of the host ID address field into a field for subnets. Default is often 255.255.255.0.
Substrate.
A foundation material on which a substance or image is placed.
SVTP.
Symbol Virtual Vehicle Computer Program.
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 VC5090
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 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.
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