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Computer Data / Voice
Network Cabling Glossary "A"
A
B
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D E F G H I J
K L M N O P Q
R S T U V W X
Y Z #
A
Ampere
A unit of measure
of electrical current.
AC
see Alternating Current.
Acceptance Angle
The largest
angle that a guided ray of light is accepted by a fiber
optic cable.
Access Method
The rules by which
a network device gains the rights to transmit a communication
on the network. Common methods include carrier sense multiple
access with collision detection, token passing, and demand
priority.
ACR
see Attenuation Crosstalk
Ratio.
Alternating Current
An electric
current that cyclically reverses the direction of flow.
Frequency is the rate at which a full cycle occurs in one
second.
Amplitude
The maximum value
of a varying signal.
Amplitude Modulation
One of
three basic methods (see also Frequency and Phase Modulation)
of adding information to a sine wave signal in which the
magnitude of the signal is varied to impose information
on it.
ANSI
American National Standards
Institute
Analog Signal
An electrical
signal that varies continuously without having discrete
values (as with a "digital" signal).
AppleTalk
Apple Computer's networking
scheme, integrated into most Apple system software, that
allows Apple computing systems to participate in peer to
peer computer networks and to also access the services of
AppleTalk servers. See also LocalTalk.
ARCnet
Attached Resource Computer
Network. A relatively low speed form of LAN data link technology
(2.5 Mbps) developed by Datapoint, in which all systems
are attached to a common coaxial cable. ARCnet uses a token-bus
form of medium access control in which a system transmits
only when it has the token
Asynchronous
Transmission where
sending and receiving devices are not synchronized. Data
must carry signals to indicate data division.
Asynchronous Transfer Mode (ATM)
A form of very fast packet switching in which data is carried
in fixed length units called "cells". Each cell is 53 bytes
in length, with 5 bytes used as a header in each cell. ATM
employs mechanisms that can be used to set up virtual circuits
between users, in which a pair of users appear to have a
dedicated circuit between them. ATM is defined in specifications
from the ITU and ATM Forum.
Attachment Unit Interface
The
IEEE 802.3 standard name for the cable connecting an Ethernet
transceiver (MAU) to a networked device. An AUI cable is
equipped with a 15-pin connector that mates with a 15-pin
connector on the networked device.
Attenuation
The decrease in
magnitude of a signal as it travels through any transmission
medium such as a cable or optical fiber. Measured in dB
per unit of length.
Attenuation Crosstalk Ratio (ACR)
The difference between attenuation and crosstalk, measured
in dB, at a given frequency. A quality factor for cabling
to assure that signal sent down a twisted pair is stronger
at the receiving end of the cable than any interference
imposed on the same pair by crosstalk from other pairs.
Audio
Used to describe the range
of frequencies within range of human hearing; approximately
20 to 20,000 Hz.
AUI
see Attachment Unit Interface.
AWG
American Wire Gage - A wire
diameter specification. The smaller the AWG number, the
larger the wire diameter.
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