Table 27. Maximum Attenuation In Horizontal Utp/Ftp Cables - IBM 8265 Site Preparation Manual

Maximum Attenuation Standards for UTP/FTP
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IBM 8265: Planning and Site Preparation Guide
Table 27 gives, for Category 3, Category 4, and Category 5 cable, the maximum
attenuation values for 305 m (1000 ft) of cable.

Table 27. Maximum Attenuation in Horizontal UTP/FTP Cables

Frequency Category 3
(MHz)
0.064 2.8
0.256 4
0.512 5.6
0.772 6.8
1 7.8
4 17
8 26
10 30
16 40
20 —
25 —
32.25 —
62.5 —
100 —
The attenuation values for frequencies of 0.512 MHz and below are provided for
information only. These values are intended for engineering design purposes and are
not required for conformance wiring.
The maximum attenuation in Table 27 should be adjusted at elevated temperatures by
using a factor of 0.3% increase per °C for Category 4 and Category 5 cable. Cable
attenuation should be verified at temperatures of 40° C (104 F) and 60° C (140 F) to
determine that the requirements of the above table are met, after adjusting for
temperature.
Category 4
UTP FTP
100 ohm 120 ohm
2.3 —
3.4 —
4.6 —
5.7 —
6.5 —
13 —
19 —
22 20.4
27 24.7
31 28
— —
— —
— —
— —
Category 5
UTP FTP
100 ohm 120 ohm
2.2 —
3.2 —
4.5 —
5.5 —
6.3 —
13 —
18 —
20 15.9
25 19
28 21.4
32 —
36 —
52 —
67 67