BT Micro Owner’s Manual
191
D. Glossary
802.11 A family of specifications for wireless LANs developed by a
working group of the IEEE. This in an Ethernet protocol,
often called Wi-Fi.
10BASE-T A designation for the type of wiring used by Ethernet
networks with a data rate of 10 Mbps. Also known as
Category 3 (CAT 3) wiring. See data rate, Ethernet.
100BASE-T A designation for the type of wiring used by Ethernet
networks with a data rate of 100 Mbps. Also known as
Category 5 (CAT 5) wiring. See data rate, Ethernet.
ADSL Asymmetric Digital Subscriber Line
The most commonly deployed "flavour" of DSL for home
users is asymmetrical DSL. The term asymmetrical refers to
its unequal data rates for downloading and uploading (the
download rate is higher than the upload rate). The
asymmetrical rates benefit home users because they
typically download much more data from the Internet than
they upload.
analog An analog signal is a signal that has had its frequency
modified in some way, such as by amplifying its strength or
varying its frequency, in order to add information to the
signal. The voice component in DSL is an analog signal. See
digital.
ATM Asynchronous Transfer Mode
A standard for high-speed transmission of data, text, voice,
and video, widely used within the Internet. ATM data rates
range from 45 Mbps to 2.5 Gbps. See data rate.
authenticate To verify a user’s identity, such as by prompting for a
password.
binary The "base two" system of numbers, that uses only two digits,
0 and 1, to represent all numbers. In binary, the number 1 is
written as 1, 2 as 10, 3 as 11, 4 as 100, etc. Although
expressed as decimal numbers for convenience, IP
addresses in actual use are binary numbers; e.g., the IP
address 209.191.4.240 is
11010001.10111111.00000100.11110000 in binary. See bit,
IP address, network mask. DHCP Dynamic Host
Configuration Protocol
DHCP automates address assignment and management.
When a computer connects to the LAN, DHCP assigns it an
IP address from a shared pool of IP addresses; after a
specified time limit, DHCP returns the address to the pool.
DHCP relay Dynamic Host Configuration Protocol relay
A DHCP relay is a computer that forwards DHCP data
between computers that request IP addresses and the DHCP
server that assigns the addresses. Each of the interfaces can
be configured as a DHCP relay. See DHCP.
DHCP server Dynamic Host Configuration Protocol server
A DHCP server is a computer that is responsible for
assigning IP addresses to the computers on a LAN. See
DHCP.
digital Of data, having a form based on discrete values expressed
as binary numbers (0's and 1's). The data component in DSL
is a digital signal. See analog.
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