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Glossary
Reversed Pair
B
B-7
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.
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.
Serial Data Transmission
The transmission of data over a single wire.
Segment
A network cable terminated at both ends.
Shielded Twisted Pair
Refers to shielded twisted pair IBM
cable with an impedance of 150Ω.
Skin Effect
The tendency of current to flow only near the surface of a conductor. This effect becomes
more pronounced at higher frequencies.