Users Guide

1124| Acronyms and Terms Dell Networking W-Series ArubaOS 6.5.x| User Guide
Term Definition
fixed wireless Wireless devices or systems in fixed locations such as homes and
offices. Fixed wireless devices usually derive their electrical power
from the utility mains, unlike mobile wireless or portable wireless
which tend to be battery-powered. Although mobile and portable
systems can be used in fixed locations, efficiency and bandwidth are
compromised compared with fixed systems.
frequency allocation Use of radio frequency spectrum regulated by governments.
frequency spectrum Part of the electromagnetic spectrum.
goodput Goodput is the ratio of the total bytes transmitted or received in the
network to the total air time required for transmitting or receiving the
bytes. The air time includes the retransmission time taken for both
successful and dropped frames.Suppose 1000 frames of 1500 bytes
each are transmitted in the network as follows:
l 50% of frames are transmitted successfully at MCS index 11 at 108
Mbps.
l 25% of the frames were dropped in the 1st attempt at 108 Mbps
but were successfully transmitted using MCS index 3 at 54 Mbps in
the second attempt.
l The remaining 25% are dropped in both the attempts.
Then the effective rate is calculated as: The total bits transmitted / the
total air time. In this example: (500 * 1500 + 250 * 1500) * 8 / (total air
time for 50% frames + total air time for 25 % frames retransmitted +
total air time for 25% dropped frames) = 40.5 Mbps.
hot spot A WLAN node that provides Internet connection and virtual private
network (VPN) access from a given location. A business traveller, for
example, with a laptop equipped for Wi-Fi can look up a local hot spot,
contact it, and get connected through its network to reach the Internet
and their own company remotely with a secure connection.
Increasingly, public places, such as airports, hotels, and coffee shops
are providing free wireless access for customers.
hot zone A wireless access area created by multiple hot spots located in close
proximity to each other. Hot zones usually combine public safety
access points with public hot spots. Each hot spot typically provides
network access for distances between 100 and 300 feet; various
technologies, such as mesh network topologies and fiber optic
backbones, are used in conjunction with the hot spots to create areas
of coverage.
Infrared Data Association
(IrDA)
An industry-sponsored organization set up in 1993 to create
international standards for the hardware and software used in
infrared communication links. In this special form of radio
transmission, a focused ray of light in the infrared frequency
spectrum, measured in terahertz, or trillions of hertz (cycles per
second), is modulated with information and sent from a transmitter to
a receiver over a relatively short distance