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SmartVoice Gateway(s) User Guide 89
YML832 Rev2
TFTP Trivial File Transfer Protocol. A protocol for file transfers, TFTP is easier to use than
File Transfer Protocol (FTP) but not as capable or secure.
TTL Time To Live A field in an IP packet that limits the life span of that packet. Originally
meant as a time duration, the TTL is usually represented instead as a maximum
hop count; each router that receives a packet decrements this field by one. When
the TTL reaches zero, the packet is discarded.
twisted pair The ordinary copper telephone wiring long used by telephone companies. It con-
tains one or more wire pairs twisted together to reduce inductance and noise. Each
telephone line uses one pair. In homes, it is most often installed with two pairs. For
Ethernet LANs, a higher grade called Category 3 (CAT 3) is used for 10BASE-T net-
works, and an even higher grade called Category 5 (CAT 5) is used for 100BASE-T
networks. See also 10BASE-T, 100BASE-T, Ethernet.
upstream The direction of data transmission from the user to the Internet.
USB Universal Serial Bus A serial interface that lets you connect devices such as print-
ers, scanners, etc. to your computer by simply plugging them in. The My ADSL
Modem is equipped with a USB interface for connecting to a stand-alone PC.
VC Virtual Circuit A connection from your ADSL router to your ISP.
VCI Virtual Circuit Identifier Together with the Virtual Path Identifier (VPI), the VCI
uniquely identifies a VC. Your ISP will tell you the VCI for each VC they provide. See
also VC.
VPI Virtual Path Identifier Together with the Virtual Circuit Identifier (VCI), the VPI
uniquely identifies a VC. Your ISP will tell you the VPI for each VC they provide. See
also VC.
VSP VoIP Service provider
WAN Wide Area Network Any network spread over a large geographical area, such as
a country or continent. With respect to the My ADSL Modem, WAN refers to the
Internet.
Web browser A software program that uses Hyper-Text Transfer Protocol (HTTP) to download
information from (and upload to) web sites, and displays the information, which
may consist of text, graphic images, audio, or video, to the user. Web browsers
use Hyper-Text Transfer Protocol (HTTP). Popular web browsers include Netscape
Navigator and Microsoft Internet Explorer. See also HTTP, web site, WWW.
Web page A web site file typically containing text, graphics and hyperlinks (cross-references)
to the other pages on that web site, as well as to pages on other web sites. When a
user accesses a web site, the first page that is displayed is called the Home page.
See also hyperlink, web site.
Web site A computer on the Internet that distributes information to (and gets information
from) remote users through web browsers. A web site typically consists of web
pages that contain text, graphics, and hyperlinks. See also hyperlink, web page.
WLAN Wireless Local Area Network
WWW World Wide Web Also called (the) Web. Collective term for all web sites anywhere in
the world that can be accessed via the Internet.POTS A telephone line used
for a standard phone-line and service will be referred to as POTS (=Plain Old
Telephone Service)