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Screened and Shielded Cabling: Definitions and Acronyms

absorption loss: Signal loss in a metallic media due to impedance losses and heating of the material

alien crosstalk: Undesired differential mode signal coupling between balanced twisted-pair cables (View alien crosstalk guide

balance: The relationship between the differential signal and common mode signals on a twisted-pair

common mode: Signals that are in phase and are measured referenced to ground

differential mode: Signals that are 180° out of phase and measured referenced to each other

electromagnetic compatibility: The ability of a system to reject interference from noise sources (immunity) and operate without interfering with other devices or equipment (emissions)

equal level transverse conversion transfer loss: The ratio of the measured common mode voltage on a pair relative to a differential mode voltage applied on another pair and normalized to be independent of length

fully-shielded: A construction, applicable to category 7 and 7A cabling, where each twisted-pair is enclosed within an individual foil screen and the screened twisted-pairs are enclosed within an overall braid or foil

ground loop: A difference in voltage potential between two ground termination points that results in an induced common mode noise current

modal conversion: Undesired conversion of differential mode signal to common mode signal and vice versa that results from poor balance

screen: A metallic covering consisting of a longitudinally applied aluminum foil tape

screened: A construction, applicable to category 6A and lower-rated cabling, where an assembly of twisted-pairs is enclosed within an overall metal foil.

Shannon capacity model: A calculation to compute the maximum theoretical amount of error-free digital data that can be transmitted over an analog communications channel within a specified transmitter bandwidth and power spectrum and in the presence of known noise (Gaussian) interference

shield: A metallic covering consisting of an aluminum braid

shielded: See fully-shielded

transfer impedance: A measure of shield effectiveness

transverse conversion loss: The ratio of the measured common mode voltage on a pair relative to a differential mode voltage applied on the same pair

transverse conversion transfer loss: The ratio of the measured common mode voltage on a pair relative to a differential mode voltage applied on another pair

Acronyms

BER: Bit error rate

DSP: Digital signal processing

ELTCL: Equal level transverse conversion transfer loss

EMC: Electromagnetic compatibility

F/UTP: Foil unshielded twisted-pair (applicable to category 6A and lower-rated cabling)

IEEE: Institute of Electrical and Electronics Engineers

LAN: Local area network

NIC: Network interface card

S/FTP: Shielded foil twisted-pair (applicable to category 7 and 7A cabling)

SNR: Signal-to-noise margin

TCL: Transverse conversion loss

TGB: Telecommunications grounding busbar

TGMB: Telecommunications main grounding busbar

UTP: Unshielded twisted-pair (applicable to category 6A and lower-rated cabling)

Vrms: Volts, root mean square