ATL Telecom AM30 - Manual (Page 171)

ATL Telecom User Guide
AM30
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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
contains 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 networks, 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 printers, scanners, etc. to your computer
by simply plugging them in. The ROUTER 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.
WAN
Wide Area Network
Any network spread over a large geographical area, such as a country or continent. With respect
to the ROUTER 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.
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.