25-pair color code
White - Blue, orange, green, brown, slate
Red - Blue, orange, green, brown, slate
Black - Blue, orange, green, brown, slate
Yellow - Blue, orange, green, brown, slate
Violet - Blue, orange, green, brown, slate
Fiber color code
Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Rose, Aqua
NVP
Nominal Velocity of Propagation
Insertion loss
The difference in the amount of power received before and after something is inserted
into the circuit.
Resistance
Resistance is expressed in Ohms, and is the property of a conductor to resist the flow of
electricity through it. V=IR
Inductance
Is a property of an electromagnetic field built around a conductor that opposes any
change in the current flow in a circuit
Capacitance
is a property of conductors that allows storage of electric charges when potential
differences exist between the conductors.
Impedance (V)
Total opposition of current flow measured in Ohms
American Wire Gauge (AWG)
,A standard rating that indicates the diameter of a wire, such as the conducting core of a
coaxial cable or the twisted pairs in a UTP cable.
Megahertz (MHz)
one million hertz, especially as a measure of the frequency of transmissions
Megabit (Mb)
Approximately one million bits. Often used as a measurement of data transfer
throughput.
Bandwidth
The amount of data that can be transmitted over a network in a given amount of time.
Decibel (dB)
A unit used to compare the loudness of different sounds.
Crosstalk
when data bleeds from one pair to another in a cable
Alien Crosstalk (AXT)
Unwanted signal coupling from one permanent link to another
USOC
Universal Service Order Code
Coaxial cable types
Series-6 and Series-11
Coaxial connectors
Series-6 uses BNC and F connectors
Series-11 uses F and N connectors
Fiber connectors
SC, ST, and SST(LC or
cladding
The glass or plastic shield around the core of a fiber-optic cable. Cladding reflects light
back to the core in patterns that vary depending on the transmission mode. This
reflection allows fiber to bend around corners without impairing the light-based signal.
Multimode Fiber (MMF)
Larger core with multiple paths of light. Common for backbone and horizontal cabling in
buildings. OM2 - Not recommended for new installs. OM3 - Higher bandwidth. OM4 -
, Highest bandwidth for MMF. 2000m/6500ft limitation. 850 nm and 1300 nm
(nanometers)
Singlemode Fiber
Smaller core with only one path of lights. Horizontal, riser, campus environments.
9 um core, 125 um cladding.
OS1 - LAN, tight buffered construction, 1310/1550 nm
OS2 - Outside Plant, 1310, 1490, 1550, 1625 nm
3000m/9842ft limtations.
Ribbon Fiber
Multiple 250 um fibers bonded into a flat color coded ribbon. Can splice a bunch at a
time.
Fiber - Tight buffer diameter
900 um
Fiber - Acrylate coating diameter
250 um
OM1
850 nm OFL - 200 MHz•km (3.5dB/km)
1300 nm - 400 MHz•km (1.5dB/km)
OM2
850 nm OFL - 500MHz•km (3.5dB/km)
1300nm - 500MHz•km (1.5dB/km)
OM3
850 nm OFL - 1500MHz•km (3.5dB/km)
850 nm RFL - 2000MHz•km (3.5dB/km)
1300 nm - 500MHz•km (1.5dB/km)
OM4
850 nm OFL - 3500MHz•km (3.5dB/km)
850 nm RFL - 4700MHz•km (3.5dB/km)
1300 nm - 500MHz•km (1.5dB/km)
Modal Distortion
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