54 man_digiflex_com_en_02_5.doc
Impulse
Pulse
Split Pairs
Improperly connected, twisted two-wire connection.
The conductors of the individual pairs are not properly
twisted with each other in pairs. New pairs are generated by
the fact that at either end of the line one conductor is
reversed. Begin (split) and end (resplit) of the reversed
section show strong crosstalk interference. Split Pairs are
the result of erroneous installation.
Pair
Pair of conductors of a balanced (symmetrical) line
STP
(= Shielded Twisted Pair)
Line which consists of a number of twisted two-wire pairs.
Each pair is wrapped in a foil shield of its own. By S/STP
(Screened Shielded Twisted Pair) a cable is understood the
entire body of which is enclosed in a common shield.
Balanced
Line
Two-wire line with the voltages of either conductor versus
earth being equal in size but opposite in polarity. Usually
two-wire line are twisted (twisted pairs) to avoid any
interference effects.
TDR
(= Time Domain Reflectometer)
The
Digiflex Com is a reflectometer operating in what is
known as the time domain. Apart from the amplitude, the
Digiflex Com measures exclusively propagation times with
the aim of calculating the distance to cable
inhomogeneities. In doing so it employs a different operating
principle than a frequency-domain instrument (network
channel analyser, spectrum analyser).
UTP
(= Unshielded Twisted Pair)
Line consisting of a number of twisted two-wire line pairs.
Unlike an STP cable, the individual pairs are not
shielded. By S/UTP (Screened Unshielded Twisted Pair) a
cable is understood the entire body of which is enclosed in
a common shield.
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