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  • Specification Sheet... 
  • CAT5e Shielded 350-MHz Solid Bulk Cable (STP) (24 AWG, 4-Pair, PVC, Yellow) Spec Sheet
    Specification Sheet for the EVNSL0504A-1000

Product Data Sheets (pdf)...DB9 PockeTester

Product Data Sheets (pdf)...Layer 1 Gigabit Media Converters

  • Pdf Drawing... 
  • GigaBase 350 CAT5e Patch Cable with Basic Connectors (Red) PDF Drawing
    PDF Drawing for the EVNSL53 Series
  • Pdf Drawing... 
  • GigaTrue%XAE 550 CAT6, 550-MHz Solid Bulk Cable (4-Pair, PVC, Gray) PDF Drawing
    PDF Drawing for the EYN876A-PB-1000 (1)

Black Box Explains... Crosstalk.

One of the most important cable measurements is Near-End Crosstalk (NEXT). It’s signal interference from one pair that adversely affects another pair on the same end.

Not only can crosstalk... more/see it nowoccur between adjacent wire pairs (“pair-to-pair NEXT“), but all other pairs in a UTP cable can also contribute their own levels of both near-end and far-end crosstalk, multiplying the adverse effects of this interference onto a transmitting or receiving wire pair.

Because such compounded levels of interference can prove crippling in high-speed networks, some cable manufacturers have begun listing Power Sum NEXT (PS-NEXT), FEXT, ELFEXT, and PS-ELFEXT ratings for their CAT5e and CAT6 cables. Here are explanations of the different types of measurements:

NEXT measures an unwanted signal transmitted from one pair to another on the near end.

PS-NEXT (Power Sum crosstalk) is a more rigorous crosstalk measurement that includes the total sum of all interference that can possibly occur between one pair and all the adjacent pairs in the same cable sheath. It measures the unwanted signals from multiple pairs at the near end onto another pair at the near end.

FEXT (Far-End crosstalk) measures an unwanted signal from a pair transmitting on the near end onto a pair at the far end. This measurement takes full-duplex operation into account where signals are generated simultaneously on both ends.

ELFEXT (Equal-Level Far-End Crosstalk) measures the FEXT in relation to the received signal level measured on that same pair. It basically measures interference without the effects of attenuation—the equal level.

PS-ELFEXT (Power Sum Equal-Level Far-End Crosstalk), an increasingly common measurement, measures the total sum of all intereference from pairs on the far end to a pair on the near end without the effects of attenuation. collapse

  • Pdf Drawing... 
  • CAT6 Feed-Through Patch Panel (Shielded, 24-Port) Drawing
    PDF Drawing for the JPM814A.
  • Manual... 
  • Deluxe Optical Power Meter with Memory Manual
    Manual for the FOPM-210.
  • Pdf Drawing... 
  • White GigaBase2 CAT5e Jack with Universal Wiring
    Drawing for the FMT929-R2 and FMT929-R2-25PAK.
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