Technical terms used data cable technology
NEXT, FEXT crosstalk attenuation
An interfering signal induced the field produced transmitted signal one twisted pair neighbouring twisted pair. PVC jacketed cables are flame-retardant. The difference between the desired signal and the induced signal the neighbouring twisted pair described crosstalk attenuation and indicated dB.
PSELFEXT
As with all crosstalk measurements (including ACR) there also PowerSum ELFEXT (PSELFEXT). POE uses the spare wires not used the Ethernet interface deliver voltage over the cable. However only the copper interfaces which use differential twisted pairs, use Power Over Ethernet [POE].3.
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Informations
Systems
Copper unscreened
Copper screened
Communication technology
. mainly determined the relative dielectric constant the dielectric. addition additives, can made flame-retardant and smokeless.
Fibre optic Copper
PoE
The Ethernet interface cable bus which runs over copper fibre.
Technical changes reserved. distinguish between NEXT Near End Cross Talk and FEXT Far End Cross Talk. This page describes the POE interface.
NVP (nominal phase velocity propagation)
Corresponds the reciprocal value the speed transmission sinusoidal wave relative the speed light. indicated speed light). (Typical 100 Mbit/s) important understand that OFL never suitable for predicting laser performance.
OFL (Overfield Launch Bandwidth)
Overfilled launch bandwidth (OFL BW) familiar metric that now understood correlate only with LED-based multimode applications. The ’normal‘ Ethernet network defined IEEE 802. These are calculated values expected for multi-pair simultaneous full duplex transmissions
Accessories
PVC
Polyvinylchloride (PVC) synthetic material containing halogen unlike Polyethylene.
PE
Polyethylene (PE) halogen-free synthetic material, which burns easily. NVP approximate average value for the cable. Synthetic materials containing halogen, form highlypoisonous gasses during their burning. Halogens (salt creators) are chlorine, bromine, fluorine, iodine and Astat. Each pair shielded with metal foil. The crosstalk length independent and becomes bigger with increasing frequency. using additives like chlorine and fluorine PVC can made flame-retardant and more resistant against outer influences. When mixed with water these gasses form harmful, corrosive acids.
PiMF
(pair metal foil) Description for STP cable
