LANcat
User Manual
Page A-8
ISO/IEC - Test Limits
Cabling System performance criteria have been established
Internationally by the ISO/IEC Standards body in the ISO/IEC
11801 Standard. The 11801 Standard establishes two applications
referred to as Class C and Class D. Cabling Links supporting
Class C applications are specified up to 16 MHz. Cabling Links
supporting Class D applications are specified up to 100 MHz.
When testing to Class C or Class D limits, use of the Modular Plug
Performance Module is recommended. If testing of the user patch
cords is required, the Modular Jack Performance Module can be
used with reduced accuracy performance.
NOTE
ScTP Class D and ISO 11801 Class D are
equivalent, with the exception that ScTP requires
shield continuity.
Table 4. ISO/IEC 11801 Pass/Fail Limits
Frequency
(MHz)
Maximum attenuation
values (dB)
Minimum NEXT
loss (dB)
Class C
Class D
Class C
Class D
1.0
3.7
2.5
39
54
4.0
6.6
4.8
29
45
10.0
10.7
7.5
23
39
16.0
14
9.4
19
36
20.0
N/A
10.5
N/A
35
31.25
N/A
13.1
N/A
32
62.5
N/A
18.4
N/A
27
100.0
N/A
23.2
N/A
24
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