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Balanced Mode Attenuation in dB/km
Frequency
Type 1A
9.6 kHz
3 dB
38.4 kHz
5 dB
4 MHz
22 dB
8 MHz
31.1 dB
10 MHz
34.8 dB
16 MHz
44 dB
20 MHz
49.2 dB
4–20 MHz
see note 3
25 MHz
61.7 dB
31.25 MHz
68.9 dB
62.5 MHz
97.5 dB
100 MHz
123.3 dB
20–300 MHz
see note 4
Notes:
1. The attenuation measurements from 9.6 kHz to 20 MHz were performed on 305 m
(or greater) reels.
2. The attenuation measurements from 20 MHz to 300 MHz were performed on 100
m reels using a North Hills 13410 or equivalent balun.
3. The attenuation in dB/km must be bounded by the following function:
f
( )
≤
A f
k 0
-- -
4
for all frequencies (f) in MHz between 4 MHz and 20 MHz. k
dB/km at 4 MHz.
4. The attenuation in dB/km, measured on 100 m reels, must be bounded by the
following function:
f
( )
≤
A f
k 0
------------
62.5
for all frequencies (f) in MHz between 20 MHz and 300 MHz. k
in dB/km at 62.5 MHz.
Type 9A
6 dB
7.4 dB
33 dB
46.7 dB
52.2 dB
66 dB
73.8 dB
see note 3
93.3 dB
104.3 dB
147.5 dB
186.6 dB
see note 4
Chapter 5. Planning for Twisted Pair Cable Connections
Type 6A
Notes
6 dB
7.4 dB
33 dB
46.7 dB
52.2 dB
66 dB
73.8 dB
see note 3
1, 3
93.3 dB
104.3 dB
147.5 dB
186.6 dB
see note 4
2, 4
is the attenuation in
o
is the attenuation
o
1
1
1
1
1
1
1
2
2
2
2
43
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