ISO is the International Standards Organisation,
which together with the IEC, International Electrotechnical
Commission, defines data cabling standards for Europe, dividing
cables into classes
TIA is the USA Telecommunications Industries
Association, and EIA the Electronic Industries Alliance, which
together define standards for the USA, dividing cables into
categories.
Table 9.8 - provides a
comparison of European and USA classifications.
|
Table 9.8 - Comparison of ISO/IEC
and TIA/EIA classifications
|
|
| ISO/IEC classifications |
TIA/EIA categories |
| Class C |
Category 3 |
| Class D |
Category 5 |
| Class D (PDAM 3) |
Category 5e |
| Class E |
Future category 6 |
| Class F |
Future category 7 |
Table 9.9 shows measurements
(worst pair-pair) made at 16 MHz.
| Table 9.9 - Near-end
cross-talk (NEXT) loss ----------------- for Categories 3, 4 & 5 data cables |
||||||||||
| Cable category |
3
|
4
|
5
|
6*
|
7*
|
|||||
| Bandwidth (MHz) |
16
|
20
|
100
|
200
|
300
|
|||||
| Frequency (MHz) |
Atten
|
NEXT
|
Atten
|
NEXT
|
Atten
|
NEXT
|
Atten
|
NEXT
|
Atten
|
NEXT
|
| 0.064 |
9
|
-
|
0.8
|
-
|
0.8
|
-
|
||||
| 0.150 |
-
|
53
|
-
|
68
|
-
|
74
|
||||
| 0.256 |
1.3
|
-
|
1.1
|
-
|
1.1
|
-
|
||||
| 0.512 |
1.8
|
-
|
1.5
|
-
|
1.5
|
-
|
||||
| 0.772 |
2.2
|
43
|
1.9
|
58
|
1.8
|
64
|
||||
| 1 |
2.6
|
41
|
2.1
|
56
|
2.1
|
62
|
1.9
|
74.3
|
2.0
|
80
|
| 4 |
5.6
|
32
|
4.3
|
47
|
4.3
|
43
|
3.8
|
65.3
|
3.8
|
80
|
| 10 |
9.8
|
26
|
7.2
|
41
|
6.6
|
47
|
6.1
|
59.3
|
6.0
|
80
|
| 16 |
13.1
|
23
|
8.9
|
38
|
8.2
|
44
|
7.8
|
56.2
|
7.6
|
80
|
| 20 |
10.2
|
36
|
9.2
|
42
|
8.8
|
54.8
|
8.5
|
80
|
||
| 31.25 |
11.8
|
40
|
11.1
|
51.9
|
10.6
|
80
|
||||
| 62.5 |
17.1
|
35
|
16.1
|
47.4
|
15
|
75.3
|
||||
| 100 |
22.0
|
32
|
20.9
|
44.3
|
19
|
71.1
|
||||
| 155 |
26.8
|
41.4
|
||||||||
| 175 |
25
|
67.3
|
||||||||
| 200 |
30.9
|
39.8
|
||||||||
| 300 |
33
|
63.7
|
||||||||
| 600 |
50
|
60.0
|
||||||||
Extracted from The Electricians Guide Fifth Edition
by John Whitfield
Published by EPA Press Click Here to order your Copy.