Fluke CableAnalyzer DSP-4100, User Manual

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DSP-4000 Series
Users Manual
B-10
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.
Segment
Network cabling terminated at both ends. Segments can be joined together using repeaters
or bridges.
Serial Data Transmission
The transmission of data over a single wire.
Shielded Twisted Pair
Twisted pair cable surrounded by a metalic shield that reduces electrical interference on
the cable. Originally referred to shielded twisted pair IBM

cable with an impedance of
150
Ω
.
Skin Effect
The tendency of current to flow only near the surface of a conductor. This effect becomes
more pronounced at higher frequencies.
Split Pair
A wiring error in twisted pair cabling where a wire from one cable pair is twisted with a
wire from another cable pair. Though the pin-to-pin connections may be correct, splitting
the cable pairs causes excessive crosstalk because the electromagnetic fields around the
wires cannot cancel properly.