
Passive Components for Electrical Networks
4-6
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Technical Specifications
Table 4-3 Electrical Data of the ITP Standard Cable at 20 °C
Cable categories
complying with EN
50173
CAT5
DC loop resistance maximum 124 Ω/km
DC insulation resistance minimum 5GΩ xkm
Attenuation/100 m at 4 MHz
10 MHz
100 MHz
maximum 3.6 dB
5.7 dB
18.0 dB
Near end crosstalk loss
(NEXT)/100 m
at 1 to 300 MHz minimum 80 dB
Characteristic
impedance
at 1 to 100 MHz
100 to 300 MHz
100 Ω±15%
100 Ω +45/-30%
Transfer impedance at 10 MHz maximum 2mΩ/m
Structural return loss at 1 to100 MHz
100 to 300 MHz
minimum 23 dB
15 dB
Longitudinal conversion
loss
minimum 43 dB
Capacitance unbalance
pair to ground
maximum 3400 pF/km
Dielectric strength at 50
Hz
-- conductor/conductor
-- conductor/shield
1min
1min
effective value
700 V
700 V
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