Equip Passive POE Patchpanel Especificações descarregar pdf (Página 73)

The Permanent Link covers the horizontal installation which includes the installation cable, patch panel, and the outlet or

junction box at the other end. The Channel Link covers the patch cords as well as the components of permanent link. A set

of measurements is dened in the ISO/IEC standard to unify the quality of structured cabling.

• Return Loss (RL)

The Return Loss is the measurement of the amount of signal that is reected back toward the transmitter. The reection

of the signal is caused by the variations of impedance in the connectors and cable and is usually attributed to a poorly

terminated wire. The greater the variation in impedance, the greater the return loss reading is.

• Attenuation-to-Crosstalk Ratio (ACR)

Attenuation-to-Crosstalk ratio (ACR) is the difference between the signal attenuation produced and NEXT. The ACR indicates

how much stronger the attenuated signal is than the crosstalk at the destination (receiving) end of a communications circuit.

• Power Sum ACR (PSACR)

The difference from the ACR is PSACR used PSNEXT in the calculation rather than NEXT.

• Near-End Cross Talk (NEXT)

It is the difference in amplitude (in dB) between a transmitted signal and the crosstalk received on other cable pairs at the

same end of the cabling. Higher NEXT values correspond to better cabling performance.

• Power Sum NEXT (PSNEXT)

Power Sum NEXT (PSNEXT) is the sum of NEXT values from 3 wire pairs as they affect the other wire pair.

• Far-End Crosstalk (ELFEXT)

FEXT is very similar to NEXT, but happens at the receiver side of the connection.

• Equal Level Far End Crosstalk (ELFEXT)

Equal Level Far End Crosstalk (ELFEXT) is a length-independent value for the transmission quality, which denes the ratio

of the crosstalk output level to the actual output level. The second pair of wires strewn on the noise level is compared to the

starting level.

• Power Sum ELFEXT (PSELFEXT)

Power Sum ELFEXT (PSELFEXT) is the sum of ELFEXT values from 3 wire pairs as they affect the other wire pair.

F/UTP

XX/XTP

Over all Shielding: F = Foil Shielded

S = Braiding

SF = Foil Shielding and Braiding

TP: Twisted Pair

Pair Shielding: U = Unshielded

F = Foil Shielded

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cable without any shielding

cables with over all braiding and pairs

in metal foil (PIMF)

cable with over all foil shielding

cable with over all foil shielding and

braiding

SF/UTP

S/FTP

U/UTP

The Construction of Cable

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