far-end crosstalk的意思|示意

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Introduction

Far-end crosstalk (FEXT), also known as near-end crosstalk (NEXT), is a type of noise interference in telecommunication systems. It is caused by the transmission of signals in one wire loop to other parallel wires. FEXT is a major source of noise that can affect performance if left unchecked. In this article, we will discuss the usage of far-end crosstalk and its importance in telecommunications.

Understanding Far-end Crosstalk

FEXT is defined as the noise interference between two different wires in the same connection. It is caused by the signals in one wire being transmitted to the other wire along the same path. This is known as “crosstalk.”

FEXT is measured in decibels (dB). It is important to measure FEXT accurately as it can affect the performance of the telecommunications system. Generally, the higher the FEXT level is, the more interference and noise it creates.

Usage of Far-End Crosstalk

FEXT is used to measure the quality of a transmission system by testing for noise and interference. It is especially important for systems using digital signals, such as DSL and cable modems.

FEXT is also used to measure the balancing of wire pairs in telecommunications systems. Unbalanced pairs can create noise that can cause errors, so it is important to make sure these are balanced properly.

When measuring FEXT, it is important to remember that the lower the dB value, the better the quality of the transmission system.

Conclusion

Far-end crosstalk is an important element in telecommunications. It is used to measure the quality of the transmission system by testing for noise and interference. It is also used to measure the balancing of wire pairs in a telecommunications system. When measuring FEXT, it is important to remember that the lower the dB value, the better the quality of the transmission system.