Faktor2

Factors Affecting Copper Cable Performance

Factors Affecting Copper Cable Performance 

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Impedance - Resistance - Reactance Electrical Interference - Crosstalk - EMI/RFI

Cable Resistance    

Opposes current flow Is measured in ohms Can be measured with an ohmmeter Is directly proportional to cable length

Cable Reactance 

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Opposes changes in voltage or current Is rated in ohms but cannot be measured with an ohmmeter Is the result of capacitance and inductance between conductors Determined by their inductanceand rea diameter c ta spacing n ce

capasitance

Impedance  Impedance

is the vector sum of resistance and reactance. Im pe d an c e

Reactance

Resistance

Electrical Interference   

Degrades data signals Can result in data errors Types of electrical interference: Crosstalk  EMI/RFI 

Crosstalk Between Conductors 

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The interference generated when a magnetic field from one wire induces current into another wire. Fields of opposite phase tend to cancel Insulation each other.

Electromagnetic Fields

Copper Conductor

+ -

EMI/RFI 

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Results from the cable being placed in an external magnetic field. Shielding blocks external magnet interference Conductor Magnetic Field Grounded Shield