Virgin Mobile MIFI 2200 - Manual (Page 77)

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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.
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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.
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SMTP — Simple Mail Transfer Protocol. An Internet standard for email transmission across IP networks.
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SSID — Service Set IDentifier. The name assigned to a Wi-Fi network.
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TCP — Transmission Control Protocol. A core protocol for transmitting and receiving information over
the Internet.
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TCP/IP — Transmission Control Protocol/Internet Protocol. The set of communications protocols used
for the Internet and other similar networks.
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Telnet — Telecommunication Network. A network protocol used on the Internet or on local area
networks.
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TFTP — Trivial File Transfer Protocol. A file transfer protocol with a subset of FTP functionality.
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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.
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UDP — User Datagram Protocol. A simple transport protocol used to transfer information on the
Internet.
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UI — User Interface. The part of a software application or hardware device that a user sees and
interacts with.
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UMTS — Universal Mobile Telecommunications Service. A third-generation broadband, packet-based
transmission of text, digitized voice, video and multimedia at data rates up to 2 Mbps. UMTS offers
a consistent set of services to mobile users all over the world. UMTS is based on the GSM standard.
Until UMTS is fully implemented, users can use multi-mode devices that switch to currently available
technology.
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USB — Universal Serial Bus. A connection type for computing device peripherals such as a printer,
mobile modem, etc. USB connectors may be used for data transfer or charging.
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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. Ports
and connectors are available in different sizes (for example, standard, mini, and micro).
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USSD — Unstructured Supplementary Service Data. A service found in HSPA/GSM networks that
allows the user to retrieve information or implement certain types of call services.
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VNC — Virtual Network Computing. A graphical desktop sharing system that uses the RFB protocol to
remotely control another computer.
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VPN — Virtual Private Network. A secure private network that runs over the public Internet. Commonly
used to connect to an office network from elsewhere.
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VPN Passthrough — A feature that allows a client to connect to a VPN server.