coupling attenuation measurements cables...
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Coupling Attenuation Measurements for Cables &
Channels
Paul KishBelden
Presented for information to IEEE 802.3bp Task Force 15 May, 2013
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Absorbing Clamp
2
P1 (Differential‐mode)
P2(Common‐mode)
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Coupling Attenuation Setup for Cables
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10
P1 = Input Power (Differential‐mode) injected on Individual Pairs
P2 = Peak Power (Common‐mode) measured by the Magnetic Field Sensor
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Coupling Attenuation Setup for Channels(EN50289‐1‐15)
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P1 = Input Power (Differential‐mode) injected on Individual Pairs
P2 = Peak Power (Common‐mode) measured by the Magnetic Field Sensor
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PICTURES OF TEST SETUP
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COUPLING ATTENUATION MEASUREMENTS
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Cal
C6AF/UTPChannel
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C6A F/UTP Channelwith 5 diff. patch cords
Meas.NoiseFloor
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C6A F/UTP Channelwith best 3 patch cords
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C6AF/UTPChannel
C6AUTP
Channel
Meas.NoiseFloor
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C6AUTPCable
C6AUTP
Channel
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Summary• Coupling attenuation measurements have been performed on cables and channels• Coupling attenuation is considered as the figure of merit of the electromagnetic
immunity:– For UTP channels
• Category 6A UTP channels that we tested generally meet the requirements of 80 – 20*log(f) currently specified in ISO 11801 ed 2.1, where f is the frequency in MHz
• Once the setup is established, most of the variability in coupling attenuation measurements is related to the patch cord
– For FTP channels• Category 6A FTP channels generally meet the requirements from 10 dB to 20 dB higher than
the coupling attenuation limits specified in ISO 11801, ed 2.1• If the shield is properly terminated at the connectors, most of the variability in coupling
attenuation measurement is related to the patch cord
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