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category 5 standard
 
Category 5 cabling is currently the most widely used medium for data transmission within the cabling industry. It is used in offices and homes a like. It was originally developed for voice,  but was rapidly adapted to computer networks. It´s typically used for twisted pair high speed networks (100BASE-TX) over 22 or 24 AWG.
 
category 5 specifications
 
Standard Transmission parameter Channel performance

Highest frequency 

CAT 5

NEXT @ 100 MHz

27.1 dB

100 MHz

 

PSNEXT @ 100 MHz

NA

 
 

Attenuation @ 100 MHz

24.0 dB

 
 

ELFEXT @ 100 MHz

17.0 dB

 
 

PSELFEXT @ 100 MHz

14.4 dB

 
 

Return Loss @ 100 MHz

8.0 dB

 
 

Propagation Delay @ 10 MHz

555 ns

 
  Delay Skew 50 ns  
 
 
category 5e standard
 
New cabling standards are continually being considered for  improvement. Advanced GUI applications are placing great demands on existing network cable speeds and it´s not even close to being over. The original category five standard has been in place for many years. The category 5 enhanced standard has only been released for a little over a year and category 6 is almost finalized as it´s replacement.

Category 5 enhanced operates at the same frequency (100MHZ) as CAT 5, with increases in certain channel performances.
 
category 5e specifications
 
Standard Transmission parameter Channel performance Improvement over Cat 5 standard

Highest frequency 

CAT 5 Enhanced

NEXT @ 100 MHz

30.1 dB

+ 3.0 dB

100 MHz

 

PSNEXT @ 100 MHz

27.1 dB

same

 
 

Attenuation @ 100 MHz

24.0 dB

+ 0.4 dB

 
 

ELFEXT @ 100 MHz

17.0 dB

same

 
 

PSELFEXT @ 100 MHz

14.4 dB

+ 2.0 dB

 
 

Return Loss @ 100 MHz

10.0 dB

same

 
 

Propagation Delay @ 10 MHz

555 ns

same  
  Delay Skew 50 ns    
 
 
category 6, the next step
 
Well, the long awaited Category 6 standard has finally been approved and finalized. The Standard was officially released in early July. The latest specifications will be added to our site very soon.

What´s waiting in the wings?

Recommendations are currently being considered for Category 7 and the not yet named "Category 8" standards. Frequencies are expected to increase to 600 MHZ!!! 
 
category 6 proposed specifications
 
Standard Transmission parameter Channel performance Improvement over Cat 5 standard

Highest frequency 

CAT 5 Enhanced

NEXT @ 100 MHz

39.9 dB

+ 9.8 dB

250 MHz

 

PSNEXT @ 100 MHz

37.1 dB

+10.0dB

 
 

Attenuation @ 100 MHz

21.2 dB

- 2.8 dB

 
 

ELFEXT @ 100 MHz

23.2 dB

+5.8 dB

 
 

PSELFEXT @ 100 MHz

20.2 dB

+5.8 dB

 
 

Return Loss @ 100 MHz

12.0 dB

+2.0 dB

 
 

Propagation Delay @ 10 MHz

555 ns

same  
  Delay Skew 50 ns same  
 
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