MEDIA SPECIFICATIONS AND REQUIREMENTS
UTP consists of four pairs of 24 AWG solid wire for data or voice communication and is typically used to wire cable runs within the walls of buildings. In some installations, existing UTP building wiring can be used for Token Ring cabling. UTP cable must conform to the limits shown in Table
Better grades of UTP cable known as supergrade or level 4 are now available. These improved grades of UTP can often be used to permit operation at 16 Mbps on longer lobe cables.
Attenuation and Impedance
The attenuation values shown in Table
Table B-4. UTP Voice Grade and Category 3 Specifications
Frequency | Impedance | Attenuation | |
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1 | MHz | 100Ω ±15% | <26 dB/km (8 dB/1000 ft.) |
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4 | MHz | 100Ω ±15% | <56 dB/km (16 dB/1000 ft.) |
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10 | MHz | 100Ω ±15% | <98 dB/km (30 dB/1000 ft.) |
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16 | MHz | 100Ω ±15% | <131 dB/km (40 dB/1000 ft.) |
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