60
© Copyright 2018 Softing IT Networks
expressed in dB. In general, a higher
positive margin value represents a
good test result, a negative value
represents a FAIL test, and zero when
the measured value is the same as the
test limit.
Marginal
: Generally referring to
marginal PASS/FAIL, refers to the
tested value’s margin is smaller than
the accuracy for the test parameter.
NEXT
: Acronym for Near-End Crosstalk,
is the measurement of the ability of a
cable to reject crosstalk. In general, the
higher the NEXT value, the greater the
rejection of crosstalk at the local
connection.
NVP
: Acronym for Nominal Velocity of
Propagation, is the speed at which the
data signals travel down the cable
expressed as a percentage of the speed
of light in a vacuum. NVP is required to
determine the length of a cable during
a test.
Patch Cord
: Also known Patch Cable, is
an electrical cable used to connect one
electronic to another for signal routing.
Commonly produced in different colors,
and are usually not longer than 2
metres.
Patch Panel
: Also known as Patch Bay,
is a device or unit featuring a number
of jacks, for connecting and managing
incoming and outgoing LAN cables.
Plug
: Generally referring to a connector
with male electrical contact or pin.
Permanent Link
: Definition of cabling
elements in horizontal cabling,
permanently installed data cable.
PoE
: Acronym for Power over Ethernet,
is the technology for wired Ethernet
LANs that allows electrical current
required for operation of devices to be
carried by data cables.
Probe
: Generally referring to a device
used to connect a test equipment to a
device under test, e.g., the Channel
adapter and Video Inspection Scope are
probes to the WireXpert.
Propagation Delay
: The measurement
of how long it takes for the signal to
travel down the cable being tested.
PSACRF
: Acronym for Power Sum ACRF,
formally known as Power Sum Equal
Level Far-End Crosstalk (PSELFEXT), is
the difference between the test signal
and the crosstalk from the other pairs
received at the far end of the link. This
is expressed in dB.
PSACRN
: Acronym for Power Sum
ACRN, formally known as Power Sum
Attenuation to Crosstalk Ratio (PSACR),
is the difference between each wire
pair’s attenuation (IL) and the
combined crosstalk received from the
other pairs. In general, higher PSACRN
values corresponds to better cabling
performance. This is expressed in dB.
Test parameter is not required for TIA
cabling standards.
PSNEXT
: Acronym for Power Sum NEXT,
is the sum of NEXT values from three
wire pairs as the affect the other wire
pair. There will be four PSNEXT results
at each end of the link tested. In
general, the higher the PSNEXT value,
the lower the crosstalk.
REMOTE
: Refers to the WireXpert unit
labelled “REMOTE”.
Reference Cord
: Generally referring to
the patch cord used for setting
reference prior to performing an
AUTOTEST.
RL
: Acronym for Return Loss, is a
measurement of reflections caused by
the impedance changes at all locations
along the link. This is expressed in dB.
Set Reference
: The compensation for
the effects of ambient conditions, e.g.,
ambient temperature, in the LOCAL and
REMOTE units, to ensure maximum
measurement accuracy of WireXpert.
Shielded
: Generally referring to an
electrical cable or connector being
enclosed in or by conductive layers to
provide noise screening.
Single Ended Test
: Feature in
WireXpert, referring to the ability to
determine the loss of copper cable at
one end without the use of the
REMOTE unit.
S/UTP
: Cable with an overall braid
screen (S) with unscreened UTP. Also
known as STP.
STP
: See S/UTP.
S/FTP
: Cable with an overall braid
screen (S) with FTP. The “shield”
underneath the jacket is a braid, and
each individual pair is surrounded by its
own foil barrier. The additional foil on
the individual pairs limit the amount of
crosstalk between them. Also known as
S-STP.
SF/UTP
: Cable with both an overall
braid screen (S) and foil shield (S) with
UTP. The overall braided screen is very
effective at protecting EMI from
entering or exiting the cable. Also
known as S-FTP.
Straight Through Cable
: Cable used to
connect computers to hubs or switches.
A straight through cable has the
following A-to-B ends pin-outs: 1-1, 2-2,
3-3, 4-4, 5-5, 6-6, 7-7, 8-8.
T568A/B
: T568A and T568B are two
color codes approved by ANSI/TIA/EIA
that are used for wiring eight-position
RJ45 plugs.
TIA
: Acronym for Telecommunications
Industry Association. Generally
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
