Installation manual

both follow the 802.3 standard. Typically they transmit
at 10 megabits per second. This is the most common
local area network specification.
Impedance The total opposition (i.e. resistance and
reactance) a circuit offers to the flow of alternating cur-
rent. It is measured in ohms, and the lower the ohmic
value, the better the quality of the conductor.
Interconnect 1. A circuit administration point, other
than a crossconnect or an information outlet, that pro-
vides capability for routing and rerouting circuits. It
does not use patch cords or jumper wires, and typical-
ly is a jack-and-plug device used in smaller distribution
arrangements or that connects circuits in large cables
to those in smaller cables. 2. An Interconnect Company
is one which sells, installs, and maintains telephone
systems for end users, typically businesses.
ISDN Integrated Services Digital Network. According
to AT&T, today’s public switched phone network has
many limitations; ISDN’s vision is to overcome these
deficiencies.
J
Jack A receptacle used in conjunction with a plug to
make electrical contact between communication cir-
cuits. Jacks and their associated plugs are used in a
variety for connecting hardware applications including
cross connects, interconnects, information outlets, and
equipment connections. Jacks are used to connect
cords or lines to telephone systems. A jack is the
female component of a plug/jack connector system,
and may be standard, modified, or keyed.
L
LAN Local Area Network. A short distance network
(typically within a building or campus) used to link
together computers and peripheral devices (such as
printers) under some form of standard control.
Link A transmission path between two points, not
including terminal equipment, work area cables, and
equipment cables
Loop 1. Typically a complete electrical circuit. 2. The
loop is also the pair of wires that winds its way from the
central office to the telephone set or system at the cus-
tomer’s office, home or factory (i.e., ‘premises’ in
telephony terms).
Loopback A diagnostic test in which a transmitted
signal is returned to the sending device after passing
through a data communications link or network. This
test allows the comparison of a returned signal with the
transmitted signal.
M
Mbps MegaBits Per Second. One million bits per sec-
ond. (Different from MBps, or a million bytes per sec-
ond.)
MDF Main Distribution Frame. A wiring arrangement
which connects the telephone lines coming from out-
side on one side and the internal lines on the other. A
main distribution frame may also carry protective
devices as well as function as a central testing point.
MHz Megahertz. A unit of frequency denoting one mil-
lion Hertz (i.e., 1,000,000 cycles per second).
MMJ Modified Modular Jack. A six-wire modular jack
with the locking tab shifted off to the right hand side.
Used in the DEC wiring system.
Modular Equipment is said to be modular when it is
made of “plug-in units” which can be added together to
make the system larger, improve the capabilities, or
expand its size.
Modem A device that converts digital signals to ana-
log signals for transmission over (usually analog)
phone wires. Stands for modulator-demodulator.
Mud Ring The recommended low-voltage mounting
bracket.
Multimedia Applications that communicate informa-
tion by more than one means.
N
Near-End Crosstalk (NEXT) Electrical noise coupled
from one pair of wires to another within a multi-pair
cable.
Network A network ties things together. Computer
networks connect all types of computers and com-
puter- related things— terminals, printers, modems,
door entry sensors, temperature monitors, etc. The
networks we’re most familiar with are long distance
ones, like phones and trains. Local Area Networks
(LANs) connect computer equipment within a build-
ing or campus.
A-4
Installation Manual
A
APPENDIX A
Glossary
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© Copyright 2001` Leviton Manufacturing Co., Inc.