Fluke DSP-4100 User Manual page 207

Glossary B
Plenum Cable
Plenum Cable
Cable certified for installation in air ducts and open spaces over suspended ceilings
without conduit. Plenum cable is fire resistant and does not emit toxic fumes when burned.
Propagation Delay
The time required for an electrical signal to travel the length of a cable.
PSELFEXT
Power sum ELFEXT. Power sum FEXT minus the attenuation of the disturbed pair.
PSFEXT is the combined FEXT received by a cable pair from the other pairs.
PSNEXT
Power sum NEXT. The combined NEXT received by a cable pair from the other pairs.
Resistor
An electronic component that resists the flow of electrical current. Resistors are used in the
terminators that are connected to the ends of coaxial cabling.
Return Loss (RL)
The loss of signal strength in cabling due to signal reflections. A cabling's RL value
indicates how well the cabling's characteristic impedance matches its rated impedance
over a range of frequencies.
Reversed Pair
A wiring error in twisted pair cabling where the pins on a cable pair are reversed between
connectors on each end of the cable.
RJ45
An 8-pin modular connector used with twisted pair cable. The RJ45 connector resembles a
telephone connector (RJ11).
ROM
Read-only memory. A device used for permanent storage of data or programs. A ROM
does not require power to maintain its contents. Once a ROM is programmed, its contents
cannot be altered.
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