User's Manual

ViewSonic 3-in-1 Access Point 39
Corporations and campuses are also implementing Hotspots to provide
wireless Internet access to their visitors and guests. In some parts of the
world, HotSpots are known as Cool Spots.
Hub. A multipart device used to connect PCs to a network via Ethernet
cabling or via WiFi. Wired hubs can have numerous ports and can transmit
data at speeds ranging from 10 Mbps to multi-gigabyte speeds per second.
A hub transmits packets it receives to all the connected ports. A small wired
hub may only connect four computers; a large hub can connect 48 or more.
Wireless hubs can connect hundreds.
HZ (Hertz). The international unit for measuring frequency, equivalent to the
older unit of cycles per second. One megahertz (MHz) is one million hertz.
One gigahertz (GHz) is one billion hertz. The standard US electrical power
frequency is 60 Hz, the AM broadcast radio frequency band is 535-1605
kHz, the FM broadcast radio frequency band is 88-108 MHz, and wireless
802.11b LANs operate at 2.4 GHz.
IEEE (Institute of Electrical and Electronics Engineers). New York,
www.ieee.org. A membership organization that includes engineers,
scientists and students in electronics and allied fields. It has more than
300,000 members and is involved with setting standards for computers and
communications.
IEEE802.11. A set of specifications for LANs from The Institute of Electrical
and Electronics Engineers (IEEE). Most wired networks conform to 802.3,
the specification for CSMA/CD based Ethernet networks or 802.5, the
specification for token ring networks. 802.11 defines the standard for
wireless LANs encompassing three incompatible (non-interoperable)
technologies: Frequency Hopping Spread Spectrum (FHSS), Direct
Sequence Spread Spectrum (DSSS) and Infrared. WECA's focus is on
802.11b, an 11 Mbps high-rate DSSS standard for wireless networks.
Infrastructure mode. A client setting providing connectivity to an AP. As
compared to Ad-Hoc mode, whereby PCs communicate directly with each
other, clients set in Infrastructure Mode all pass data through a central AP.
The AP not only mediates wireless network traffic in the immediate
neighborhood, but also provides communication with the wired network.
See Ad-Hoc and AP.
Internet appliance. A computer that is intended primarily for Internet
access, is simple to set up and usually does not support installation of third-
party software. These computers generally offer customized web browsing,
touch-screen navigation, e-mail services, entertainment and personal