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RTP - Real-time Transport Protocol
A packet format for streaming multimedia over the Internet.
SIM - Subscriber Identification Module
Found in GSM network technology, the SIM is a card containing identification information
for the subscriber and their account. The SIM card can be moved to different devices.
SMS -Short Message Service
A service for sending short messages of up to 160 (224 in 5-bit mode) characters to
mobile devices. SMS is also known as text messaging.
SMTP - Simple Mail Transfer Protocol
An Internet standard for email transmission across IP networks.
SSID - Service Set Identifier
The name assigned to a Wi-Fi network.
TCP - Transmission Control Protocol
A core protocol for transmitting and receiving information over the Internet.
TCP/IP - Transmission Control Protocol / Internet Protocol
A communications protocol developed under contract from the U.S. Department of
Defence to internetwork dissimilar systems.
Telnet - Telecommunication Network
A network protocol used on the Internet or on local area networks.
TFTP - Trivial File Transfer Protocol
A file transfer protocol with a subset of FTP functionality.
UA - User Agent
Any device or software used to access a web page. A user agent might be a web
browser, a smart phone, or a screen reader.
UDP - User Datagram Protocol
UDP is a connectionless transport service that dispenses with the reliability services
provided by TCP. UDP gives applications a direct interface with IP and the ability to
address a particular application process running on a host via a port number without
setting up a connection session.
UI - User Interface
The part of a software application or hardware device that a user sees and interacts with.
UMTS - Universal Mobile Telecommunications Service
A GSM-based, third-generation broadband, packet-based transmission of text, digitized
voice, video and multimedia at data rates up to 2Mbps. UMTS offers a consistent set of
services to mobile users all over the world. Until UMTS is fully implemented, users can
use multi-mode devices that switch to currently available technology.
USB - Universal Serial Bus
A connection type for computing device peripherals such as a printer, mobile modem,
etc.
USB Port Types
The USB ports on computers and hubs have a rectangular Type A socket, and peripheral
devices have a cable with a Type A plug. Peripherals that do not have an attached cable
have a square Type B socket on the device and a separate cable with a Type A and Type
B plug.
VPI - Virtual Path Identifier & VCI - Virtual Channel Identifier
A VPI is a 8-bit field while VCI is a 16-bit field in the ATM cell header. A
VPI
identifies a
link formed by a virtual path and a
VCI
identifies a channel within a virtual path. In this
way, the cells belonging to the same connection can be distinguished. A unique and
separate VPI/VCI identifier is assigned in advance to indicate which type of cell is
following, unassigned cells, physical layer OAM cells, meta-signalling channel or a generic
broadcast signalling channel. Your ISP should supply you with the values.
Virtual Server
You can designate virtual servers, e.g., a FTP, web, telnet or mail server, on your local
network and make them accessible to the outside world. A virtual server means that it is
not a dedicated server -- that is, the entire computer is not dedicated to running on the
public network but in the private network.
VNC - Virtual Network Computing
A graphical desktop sharing system that uses the RFB protocol to remotely control
another computer.
