Category 5 / 5E & Cat 6 Cabling Tutorial and FAQ's - the best source for information on Cat 5 / 5e / 6 cable!

Category 5 / 5E & Cat 6 Cabling Tutorial and FAQ's - the best source for information on Cat 5 / 5e / 6 cable!: "Category 5, 5 E, 6 and 7 Performance Specification Chart
Parameter Category 5
and Class D
with additional
requirements TSB95
and FDAM 2 Category 5E
('568-A-5)
Category 6
Class E
(Performance at
250 MHz shown
in parentheses) Proposed
Category 7
Class F
(Performance at
600 MHz shown
in parentheses)
Specified frequency range 1-100 MHz 1-100 MHz 1-250 MHz 1-600 MHz
Attenuation 24 dB 24 dB 21.7 dB
(36 dB) 20.8 dB
(54.1 dB)
NEXT 27.1 dB 30.1 dB 39.9 dB
(33.1 dB) 62.1 dB
(51 dB)
Power-sum NEXT N/A* 27.1 dB 37.1 dB
(30.2 dB) 59.1 dB
(48 dB)
ACR 3.1 dB 6.1 dB 18.2 dB
(-2.9 dB) 41.3 dB
(-3.1 dB)**
Power-sum ACR N/A 3.1 dB 15.4 dB
(-5.8 dB) 38.3 dB
(-6.1 dB)**
ELFEXT 17 dB
(new requirement) 17.4 dB 23.2 dB
(15.3 dB) ffs***
Power-sum ELFEXT 14.4 dB
(new requirement) 14.4 dB 20.2 dB
(12.3 dB) ffs***
Return loss 8 dB*
(new requirement) 10 dB 12 dB
(8 dB) 14.1 dB
(8.7 dB)
Propagation delay 548 nsec 548 nsec 548 nsec
(546 nsec) 504 nsec
(501 nsec)
Delay skew 50 nsec 50 nsec 50 nsec 20 nsec"