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型号
项目
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单位
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频率(MHZ)
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UTP5
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UTP5e
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数值
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导体(单线)
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|
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24AWG
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24AWG
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直流电阻
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Ω/100 m,20℃
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9.38
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9.38
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直流电阻不平衡最大值
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%
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2.5
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2.5
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对地电容不平衡最大值
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pF/100m
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|
330
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330
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特性阻抗
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Ω
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1.0~100
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100±15%
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100±15%
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结构回波损耗 机构回波损耗值应大于等于表中所列数值.在频率大于20MHZ小于等于100MHZ之范围内,回波损耗应由以下公式算出：回波损耗≥23-101g(f/20)(对应UT5)回波损耗≥28-101g(f/20)(对应UTP5e)
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dB/100m
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1.0~20.0
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23
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23
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25.0
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24.3
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24.3
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31.25
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23.6
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23.6
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62.5
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21.5
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21.5
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100
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20.1
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20.1
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衰减 此数据用于工和设计面非测试依据。40℃下测试时，最大衷减值应增大8％，60℃下没试时，最大衰减值应增大16%.室温下在0.772 100MHZ频涨范围内,测试每对导体最大损耗时应用以下公式计算：
衰减（f）≤1.967f √f+0.023f+0.050/ √f
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dB/100m
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0.772
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1.8
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1.8
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1.0
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2.0
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2.0
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4.0
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4.1
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4.1
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8.0
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5.8
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5.8
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10.0
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6.5
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6.5
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16.0
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8.2
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8.2
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20.0
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9.2
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9.2
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25.0
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10.4
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10.4
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31.25
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11.7
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11.7
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62.5
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17.0
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17.0
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100.0
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22.0
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22.0
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最差对近端串音(NEXTdB),最小值室温下在0.772—100MHZ频涨范围内,至少100米长样品中每对导体最小串音偶合损耗应由下式计算:
NEXT(f)≥62.31gf(对于UTP5)
NEXAT(f)≥65.3-151gf(对于UTP5e)
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dB/100m
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0.772
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64
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67
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1.0
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62
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65
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4.0
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53
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56
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8.0
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48
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51
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10.0
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47
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50
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16.0
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44
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47
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20.0
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42
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46
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25.0
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41
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44
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31.25
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39
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43
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62.5
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35
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38
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100.0
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32
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35
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近端串音衰减功率和PSNEXT≥62.3-15X1gf
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dB/100m
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20
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42.8
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42.8
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25.0
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41.3
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41.3
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31.25
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39.9
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39.9
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65.2
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35.4
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35.4
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100
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32.2
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32.2
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等电平地远端串音
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dB/100m
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0.772
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63.2
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66
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1.0
|
61
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63.8
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4.0
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49
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51.7
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8.0
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42.9
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45.7
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10.0
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41
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43.8
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16.0
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37
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39.7
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20.0
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35
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37.7
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25.0
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33
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35.8
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31.25
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31.1
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33.9
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62.5
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24.7
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27.8
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100.0
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21
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23.8
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功率总和等电平远端串音
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dB/100m
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0.772
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63.0
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63.0
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1.0
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60.8
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60.8
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4.0
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48.7
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48.7
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8.0
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42.7
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42.7
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10.0
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40.8
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40.8
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16.0
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36.7
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36.7
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20.0
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34.7
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34.7
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25.0
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32.8
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32.8
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31.25
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30.9
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30.9
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62.5
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24.8
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24.8
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100.0
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20.8
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20.8
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衰落减串音比
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dB/100m
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0.772
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62
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65
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1.0
|
60
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63.3
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4.0
|
49
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52.2
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8.0
|
43
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46.0
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10.0
|
41
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43.8
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16.0
|
36
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39.0
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20.0
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33.5
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36.5
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25.0
|
31
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33.9
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31.25
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28.2
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31.2
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62.5
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18.4
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21.4
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100.0
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10.3
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13.3
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