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1000BASE-T |
A recent LAN standard for implementing 1000 Mbps Ethernet on Category 5 cable. See also Gigabit Ethernet.
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100BASE-T |
The twisted pair version of 100 Mbps Ethernet. Requires Category 5 cabling. |
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10BASE2 |
Also called Thinnet. 10 Mbps Ethernet on thin (RG58) coaxial cable. |
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10BASE5 |
Also called Thicknet. 10 Mbps Ethernet on thick coaxial cable. |
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10BASE-T |
10 Mbps Ethernet on twisted-pair
(Category 3) cable. |
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110 Connector |
A popular insulation
displacement connector (IDC) used modular jacks, patch panels and cross
connects. |
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3270 (IBM) |
A mainframe computer. Originally implemented on RG62 coax. Now generally implemented on UTP cable
using baluns. |
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66 Block |
A legacy cross connect
system. Similar in function to AMP
110Connect XC. |
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AS/400 (IBM) |
A midrange computer system. Originally implemented on twinaxial
cable. Now generally implemented on
UTP cable using baluns. |
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Attenuation |
The amount of signal lost as it
travels through the cabling system. |
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Backboard |
Refers to a plywood panel
mounted on the wall of a telecom closet. Used to mount the cross connect. |
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Backbone cabling |
Cabling between floors in a
building or between buildings in a campus. |
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Balun |
A transformer used to attach
coaxial or twinaxial equipment to twisted pair cabling. |
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BNC |
A bayonet style coaxial
connector. |
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Category 3 |
A performance classification for
twisted pair cables, connectors and systems. Specified to 16 MHz. Suitable
for voice and data applications up to 10 Mbps. |
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Category 5 |
A performance classification for
twisted pair cables, connectors and systems. Specified to 100 MHz. Suitable
for voice and data applications up to 155 Mbps (possibly 1000 Mbps). |
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Category 5e |
Also called Enhanced Category
5. A performance classification for
twisted pair cables, connectors and systems. Specified to 100 MHz. Suitable
for voice and data applications up to 1000 Mbps. |
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Category 6 |
A performance classification for
twisted pair cables, connectors and systems. Specified up to 250 MHz. |
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Channel |
The entire horizontal cabling
system. Everything between the computer and the LAN hub in the telecom
closet, excluding the equipment connections. |
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Coax |
Short for coaxial. Single-conductor cables with braided
shields. Used in the 80's for data
transmission. Now generally replaced
with UTP for data. Still used for
video. |
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Consolidation point |
An interconnect device that
allows the horizontal cable to be split into two parts. Used for zone cabling. |
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Cross connect (XC) |
Connecting hardware used to
patch between two groups of cables (horizontal to backbone, for
example). AMP 110Connect XC. |
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Data rate |
The speed, measured in bits per
second, that a particular network (or other application) transmits data. |
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dB |
Abbreviation for decibel. The logarithmic ratio of two powers,
voltages or currents. |
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Delay skew |
The difference in propagation
delay between the slowest and fastest pairs in a cable or system. |
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Drop |
Refers to the horizontal cabling
for one work area, as in "The job has 100 drops. " |
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ELFEXT |
Equal Level Far End Crosstalk. A
measure of FEXT which accounts for the attenuation of the cabling system. |
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Enhanced Category 5 |
Also called Category 5e. A performance classification for twisted
pair cables, connectors and systems. Specified to 100 MHz. Suitable
for voice and data applications up to 1000 Mbps. |
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Ethernet |
The most common network protocol
in use. A protocol is a set of rules
enabling data communications. Based originally on a bus topology. |
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F connector |
A common coaxial connector used
for video applications (CATV). |
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FEXT |
Far End Crosstalk. Unwanted
noise coupled onto a receive pair from a transmit pair at the far end of the
system. |
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Gbps |
A data rate. Gigabits per
second. A gigabit is one billion
bits. |
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Gigabit Ethernet |
The newest (1999) and fastest
version of Ethernet. Data rate is
1000 Mbps or 1 Gigabit per second. |
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Horizontal cabling |
Includes the work area outlet,
distribution cable and connecting hardware in the telecom closet. |
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Hub |
Network device, usually in the
telecom closet, that stations connect to. |
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IDC |
Insulation Displacement
Connector. A style of connector that
slices through the cable insulation to make a connection. Eliminates the need to strip insulation. |
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IEEE |
Institute of Electrical and
Electronics Engineers. 802 Group develops Local Area Network standards and
Metropolitan Area Network standards. |
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IEEE 802. 3 |
Usually referred to as
Ethernet. A networking protocol. . |
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IEEE 802. 5 |
Usually referred to as token
ring. A networking protocol. |
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Impedance |
The total opposition to the flow
of alternating current in a conductor. |
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Jumper |
Usually unjacketed twisted pair
wire used to make a cross connection. |
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Kbps |
A data rate. Kilobits, or
thousands of bits, per second. |
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LAN |
Local Area Network. Usually confined to one building or even
one floor. Large companies may have
several LANs connected by an internetwork or backbone network. |
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Link |
The part of the horizontal
cabling system between the work area outlet and the telecom closet
termination. |
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MAC |
Moves Adds and Changes: When data and voice services (to include: outlets and cabling, patching, etc. ) of a given location are moved to a new location or removed completely. |
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Mbps |
A data rate. Megabits, or
millions of bits, per second. |
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MHz |
Megahertz. Millions of cycles (Hertz) per second. A
frequency or frequency range (bandwidth) through which a cabling system is
specified. |
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Modular jack |
The standard female connector
for twisted pair cable. A
"telephone jack". |
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Modular plug |
The standard male connector for
twisted pair cable. A "telephone
plug". |
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MT-RJ |
A small form factor, dual fiber
connector. |
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Multimode |
A type of optical fiber in which
the light travels in multiple paths. Utilizes LEDs or lasers as light
sources. |
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Multi-user outlet |
A work area outlet designed to
support multiple users. Also called multi-user telecommunications outlet
assembly or MUTOA. |
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MUTOA |
See multi-user outlet. |
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NEXT |
Near End Crosstalk. The unwanted noise coupled into a device's
receive circuit from its transmit circuit. |
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NIC |
Network interface card. Allows a PC to attach to a network. |
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Node |
A device connected to a network. |
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Outlet |
Where the horizontal cabling
terminates in the work area. |
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Patch cord |
A cable assembly with (usually)
a plug on each end, used to make a cross connection. |
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Patch panel |
A rack-mountable panel (usually
19" wide) containing connecting hardware. Used to patch between groups of cables and equipment. |
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PBX |
Private Branch Exchange. The premises telephone switch. Handles telecom functions. |
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Plenum |
A chamber that houses
environmental air transfer. Plenum-rated cable is required in such locations. |
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Power sum |
A mathematical addition of noise
from multiple disturbers. Applied to NEXT and ELFEXT requirements. |
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Propagation
delay |
The amount of time it takes a
signal to travel through a cable or system. |
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Propagation delay skew |
The difference in propagation
delay between the slowest and fastest pairs in a cable or system. |
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PS ELFEXT |
See power sum and ELFEXT. |
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PS NEXT |
See power sum and NEXT. |
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Punchdown |
Refers to IDC connectors and the
method used to terminate them. |
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Rack |
Used to mount patch panels,
enclosures and equipment in the telecom closet. Usually 19" wide by 7' high. |
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Return loss |
A measure of the signal
reflected back toward the transmitter as a result of impedance variations in
the cabling system. |
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Riser |
Backbone cabling connecting
telecom closets situated vertically on separate floors. |
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RJ11 |
A wiring pattern for 6-position
modular jacks. Used to refer to the
jacks themselves. |
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RJ21 |
A wiring pattern for a 25-pair
(AMP CHAMP) connector. Also used to
refer to the connectors themselves. |
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RJ45 |
A wiring pattern for8-position modular jacks. Used to refer to the jacks themselves. |
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SC connector |
A duplex optical fiber
connector. The standard connector for optical fiber per the 568 cabling
standard. |
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Singlemode |
A type of optical fiber in which
the light travels in a single path. Utilizes lasers as a light source. |
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ST connector |
A bayonet style optical fiber
connector. An alternate style per the
568 standard. |
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STP |
Shielded Twisted Pair. 2-Pair 150 ohm shielded cable. |
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Switch |
A type of network hub. Provides higher bandwidth than shared
hubs. |
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System/3X (IBM) |
The predecessor of the AS/400. |
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T568A and B |
The two standard wiring patterns
for 8-position modular jacks. |
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Telco |
Short for telecommunications (or
telephone company). |
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Telco connector |
Refers to a 25-pair (AMP CHAMP)
connector. |
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Telecom closet |
Telecommunications closet. The
area of the building that houses the termination of the horizontal
cabling. May also contain LAN
electronics. |
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Thicknet |
IEEE 10BASE5. 10 Mbps Ethernet on thick coaxial cable. |
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Thinnet |
IEEE 10BASE2. 10 Mbps Ethernet
on thin (RG58) coaxial cable. |
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Token ring |
A networking protocol based on a
token-passing ring. |
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Twisted pair cable |
Cable made from pairs of wires
which have been twisted together. |
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UTP |
Unshielded twisted pair cable.
Cable made from pairs of wires which have been twisted together. |
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Wiring closet |
See telecom closet. |
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Work area |
Where the users' communications
equipment resides. The part of the
cabling system between the outlet and the equipment. |
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Zone cabling |
An architectural concept which
splits the horizontal cabling into two sections. Eliminates the need to
replace the entire horizontal cable in moves, adds and changes.
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