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Electronic Industries Association/Telecommunications

Industries Association A trade organization of manu-

facturers which set standards for use of its member

companies. Many associations fall under the umbrella

of EIA, though it has recently been absorbed by the

TIA, or Telecommunications Industry Association. See

www.eia.org or www.tiaonline.org.

Electromagnetic Interference (EMI) The interference

in signal transmission or reception caused by the radi-

ation of electrical and magnetic fields.

Equipment As distinguished from Device. Telecom

equipment (computers, phones, faxes, etc.) plugs into

telecommunications outlets or devices. See also Device.

Epoxy Connector A type of fiber optic connector that

requires a Chemical bond, or epoxy.

Ethernet A type of local area network used for con-

necting computers, printers, workstations, terminals,

etc. within the same building. Ethernet is a physical link

and data link protocol that operates over twisted pair

wire and over coaxial cable at speeds greater than 1

Gbps. Ethernet LANs are being promoted by DEC, Intel

and Xerox. Compare with Token Ring.

FDDI Fiber Distributed Data Interface FDDI is a 100 Mbps

fiber optic LAN. It is an ANSI standard. It uses a “counter-

rotated” Token ring topology. An FDDI LAN is typically

known as a “backbone” LAN. It is used for joining file

servers together and for joining other LANS together.

Fiber Optics High bandwidth communication medium

in which communication signals are transmitted in the

form of light beams over glass optical fiber cables

Frequency Modulation Radio transmission in which

the frequency of a sine wave signal is varied so it can

carry information. Abbreviated as FM

Gain The increase in signaling power that occurs as

the signal is boosted by an electronic device.

Measured in decibels (dB).

Gauge Refers to the diameter of wire. The higher the

gauge number, the thinner the wire’s diameter and the

higher its resistance.

Headroom (also called Overhead or Margin) The

number of decibels by which a system exceeds the

minimum defined requirements. The benefit of head-

room is that it reduces the bit-error rate (BER), and pro-

vides a performance ‘safety net’ to help ensure that

current and future high speed applications will run at

peak accuracy, efficiency and throughput.

Hertz A unit of frequency equal to one cycle per sec-

ond. Abbreviated as Hz.

Home Run Phone system wiring where the individual

cables run from each phone directly back to the cen-

tral switching equipment. Home run cabling can be

thought of as “star” cabling. Every cable radiates out

from the central equipment. All PBXs and virtually all

key systems work on home run cabling. Some local

area networks work on home run wiring. See also Star

Wiring, Daisy Chain.

Hub The point on a network where circuits are con-

nected. Also, a switching node. In Local Area

Networks, a hub is the core of a star as in ARCNET,

StarLAN, Ethernet, and Token Ring. Hub hardware can

be either active or passive. Wiring hubs are useful for

their centralized management capabilities and for their

ability to isolate nodes from disruption.

Hybrid Connector A connector containing both opti-

cal fiber and Electrical conductors.

Insulation Displacement Connection (IDC) A type of

wire termination Where wire is “punched down” into a

metal holder which cuts into the Insulation wire and

makes contact with the conductor, causing the electri-

cal connection to be made.

IDF Intermediate Distribution Frame A metal rack

designed to connect cables and located in an equipment

room or closet. Consists of components that provide the

connection between inter-building cabling and the intra-

building cabling, i.e. between the Main Distribution Frame

(MDF) and individual phone wiring. There’s usually a per-

manent, large cable running between the MDF and IDF.

The changes in wiring are done at the IDF. This saves con-

fusion in wiring.

IEEE 802.3 IEEE stands for the Institute of Electrical

and Electronic Engineers, a publishing and standards-

making body responsible for many standards used in

LANs, including the 802 series. Ethernet and StarLan

A-3

APPENDIX A

Glossary

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