Glossary
Permanent Link
»
In the horizontal cabling portion
of a structured cabling system, the permanent link
contains the following: the telecommunications
outlet (TO), the cabling between the horizontal cross-
connect (HC) and the TO, an optional consolidation
point (CP), and the connecting hardware at the HC.
Power over Ethernet
(PoE)
»
PoE technology
describes any system capable of transmitting
electrical power, along with data, to remote devices
over standard twisted-pair cable in an Ethernet
network. This technology is useful for powering
IP telephones, wireless access points, security
cameras, and other appliances where it would
be inconvenient or infeasible to supply power
separately.
Power over HDBaseT
(PoH)
»
PoH provides up
to 100 watts of power to devices over HDBaseT
technology and twisted pair cabling.
Power Sum
»
A test method for four-pair cable
whereby the mathematical sum of pair-to-pair
crosstalk from three pairs to one pair is measured.
Premises
»
Telephony term for the space
occupied by a customer or authorized/joint user in
a building(s) on continuous or contiguous property
(except railroad rights of way, etc.) not separated
by a public road or highway. Frequently used as
“premises-based”.
Premises
Wiring System
»
The entire wiring system
on the user’s premises, especially the supporting
wiring that connects the communications outlets
to the network interface jack.
Punchdown
»
Refers to the use of an impact
tool that enables installers to make efficient IDC
style connections.
RCDD
®
(Registered Communications Distribution
Designer)
»
The RCDD title is a professional
credential granted by BICSI. RCDDs have
demonstrated a superior level of knowledge of
Information Transport Systems (ITS) design and
associated disciplines.
Return Loss
(RL)
»
A measure of the similarity of the
impedance of a transmission line and the impedance
at its terminations. It is a ratio, expressed in decibels,
of the power of the outgoing signal to the power of
the signal reflected back.
RJ
(registered jack)
»
RJs are telephone and
data jacks registered with the FCC. Specific RJs,
such as RJ-11 and RJ-45, are widely used in the
telecommunications industry. A much more
accurate way to identify a jack is to specify the
number of positions (width of opening) and number
of conductors. Example: “8-position, 8-conductor
(8P8C) jack” or “6-position, 4-conductor (6P4C) jack”.
RU
(rack unit)
»
A unit of measure of vertical space
in an equipment rack or cabinet. One rack unit is
equal to 1.75 in (45 mm).
Standards
»
Agreed-upon principles of performance.
Standards are set by committees working under
various trade and international organizations.
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