Fluke CableAnalyzer DSP-4000 Series User Manual page 219

Glossary
C
Resistor
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 cable.
Return Loss (RL)
The loss of signal strength in a cable due to signal reflections. A cable's RL value indicates
how well the cable'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.
Runt Packet
An Ethernet data packet that is shorter than the valid minimum packet length of 64 bytes.
Runt packets are usually caused by a collision.
Shielded Screened Twisted Pair (SsTP)
Twisted pair cable in which each pair is wrapped in a metallic sheath, and the entire bundle
is wrapped by an overall shield.
Screened Twisted Pair (ScTP)
Twisted pair cable wrapped in a metallic sheath. The sheath, which is grounded at a single
location in the network, acts as a shield that protects the cable pairs from crosstalk and
other sources of electrical noise.
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