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GLOSSARY

A-1

APPENDIX A

Glossary

Amplifier A component that boosts the strength of a

transmitted analog signal as measured in decibels

(dB); an amplifier is similar to a repeater in digital sys-

tems

Amplitude The distance between high or low points

of a waveform or signal. Also referred to as wave

“height”.

Amplitude Modulation A deliberate change in the

amplitude of radio waves in order to transmit sound or

visual images

Analog A method of transmitting information by a con-

tinuously variable electrical signal

ATM Asynchronous Transfer Mode. A high bandwidth,

low delay, packet-like switching and multiplexing tech-

nique. Usable capacity is segmented into fixed-size

cells, consisting of header and information fields. In an

ATM data transmission, characters are sent at irregular

intervals with each character including a start bit at the

beginning and a stop bit at the end so the computer

can identify and distinguish each character

Attenuation The decrease in the power of a signal,

light beam, or light wave as they pass through a trans-

mission medium. Measured in decibels. Attenuation is

the opposite of gain. Attenuation often increases with

frequency, cable length, and the number of connection

in a circuit.

Architecture The way that a system (hardware, soft-

ware, and the network) is structured and its compo-

nents fit together,

AWG American Wire Gauge. Standard measuring

gauge for non-ferrous conductors (i.e., non-iron and

non-steel). Gauge is a measure of the diameter or

cross sectional area of the conductor (the thickness of

the cable)

Backbone Wiring The physical/electrical intercon-

nections between telecommunications closets and

equipment rooms. Cross-connect hardware and

cabling in the Main and Intermediate Cross-Connects

are considered part of the backbone wiring. The back-

bone is the more permanent part of a communications

network and it carries most of the traffic.

Bandwidth The difference between the highest and

the lowest frequencies of a transmission channel (path

for information transmission). Identifies the amount of

data that can be sent through a given channel.

Measured in Hertz (Hz or cycles per second); higher

bandwidth numbers mean higher data capacity.

Bend Radius (Fiber) Radius of curvature that a fiber

can bend without breaking. Also see Cable Bend

Radius

BICSI (Building Industry Consulting Service

International) BICSI is a non-profit industry association

concerned with promoting correct methods for all

aspects of the installation of communications wiring

Binary Digit The basic unit of data that has a value of

zero or one. Also known as a bit

BIT/S Bits per second. A measure of speed or data

rate. Abbreviated as BPS. Larger measurements

include Kbps (kilo or thousands of bits per second)

and Mbps (mega or millions of bits per second).

BNC A connector used to terminate coaxial cables.

BNC stands for Bayonet-Neill-Concelman.

Broadband Sufficient bandwidth to carry multiple

voice, video or data channels simultaneously.

Bus A network topology in which nodes are connect-

ed to a single cable with terminations at each end

Cable Assembly A fixed length of cable with con-

nectors installed on both ends. Sometimes called a

Patch Cord, or Patch Cable.

Cable Bend Radius The amount of bend that can

occur before a cable may sustain damage or increased

attenuation.

Category 3 CAT3 A Category of Performance for

inside wire and cable systems. Commonly used for

voice applications and data to 10 Mbps.

Defined by FCC Part 68, ANSI/EIA/TIA-568, TIA TSB-36

and TIA TSB-40.

Category 5 CAT5 A Category of Performance for

inside wire and cable systems. Used in support of voice

For more information call your Leviton representative or the Leviton Technical Hotline at 800-722-2082