Lesson 2: Physical Layer Cabling: Twisted Pair Flashcards
Alien Crosstalk (AXT)
Unwanted signal coupling from one permanent link to another
Attenuation (Insertion Loss)
The amount of loss in the signal strength as it propagates down a wire or fiber strand
Balanced Mode
Neither wire in the wire pairs connects to ground
Bottlenecking
Another term for network congestion
Building Entrance
The point where the external cabling and wireless services interconnect with the internal building cabling
Campus Network
A collection of two or more interconnected LANs in a limited geographic area
CAT6 (category 6)
Twisted-pair cables capable of carrying up to 1000Mbps (1 gigabit) of data up to a length of 100 meters
CAT7/7a and CAT6a
UTP cable standards that support 10GB date rates for a length of 100 meters
Color Map
The specification of which wire color connects to which pin on the connector
Cross-connect
A space where you are going to take one or multiple cables and connect them to one or more cables or equipment
Crossover Cable
Transmit and receive signal pairs are crossed to properly align the transmit signal on one device with the receive signal on the other device
Crosstalk
Signal coupling in a cable
EIA
Electronic Industries Alliance
EIA/TIA 568-B
The standard that defines the six subsystems of a structured cabling system
ELTCTL
Equal Level Transverse Conversion Transfer Loss
EMI
Electromagnetic interference
Entrance Facilities (EF)
A room set aside for complex electronic equipment
Equipment Room (ER)
Cabling that interconnects telecommunication closets in the same building and between buildings
F/UTP
Foil over twisted-pair cabling
FastEthernet
An Ethernet system operating at 100Mbps
Full Channel
Consists of all the link elements from the wall plate to the hub or switch
Full Duplex
Computer system can transmit and receive at the same time
Gigabit Ethernet
1000Mbps Ethernet
Horizontal Cabling
Cabling that extends out from the telecommunications closet into the LAN work area
Horizontal Cross-connect (HC)
The connection between the building distributors and the horizontal cabling to the work area or workstation outlet—another term used for the HC is the floor distributors (FD)
Hybrid Echo Cancellation Circuit
Removes the transmitted signal from the receive signal
IEEE 802.3an-2006 10GBASE-T
The standard for 10Gbps
Intermediate Cross-connect (IC)
Also called the building distributor (BD), this is the building’s connection point to the campus backbone. The IC links the MC to the horizontal cross-connect (HC).
LCL
Longitudinal Conversion Loss
Link
Point from one cable termination to another
Main Cross-connect (MC)
Usually connects two or more buildings and is typically the central telecommunications connection point for a campus or building. It is also called the main distribution frame (MDF) or main equipment room. The MC connects to Telco, an ISP, and so on. Another term for the MC is the campus distributor (CD).
Multilevel Encoding
Technique used to reduce in the required bandwidth to transport the data
Network Congestion
A slowdown on network data traffic movement
Physical Layer
Provides the electrical and mechanical connection to the network
PSAACRF
Power-Sum Alien Attenuation Cross-talk Ratio Far-End
PSANEXT
Power-Sum Alien Near-End Crosstalk
RX
Abbreviation for receive
STP
Shielded twisted pair
Straight-through Cable
The wire pairs in the cable connect to the same pin numbers on each end
T568A
Wire color guidelines specified under the EIA/TIA568B standard
T568B
Wire color guidelines specified under the EIA/TIA568B standard
TCL
Transverse Conversion Loss
TCO
Telecommunications outlet
TCTL
Transverse Conversion Transfer Loss
Telecommunications Closet
The location of the cabling termination points that includes the mechanical terminations and the distribution frames
TIA
Telecommunications Industry Association
TR
Another name for the telecommunications closet
Wire-map
A graphical or text description of the wire connections from pin to pin
Workstation or Work Area Outlet (WO)
Also called the TO (telecommunications outlet), it’s used to connect devices to the cable plant. The cable type typically used is CAT3, CAT5, CAT5e, CAT6, CAT6A, and various coaxial cables. Devices typically connected to these outlets are PCs, printers, servers, phones, televisions, and wireless access points.
