NonReturntoZeroÜbertragung

NonReturntoZeroÜbertragung refers to a type of digital signal encoding where the signal never returns to a zero voltage level during the transmission of a single bit. This is in contrast to return-to-zero (RZ) encoding, where the signal momentarily returns to zero between bits, regardless of the bit's value. In Non-Return-to-Zero (NRZ) schemes, a high voltage typically represents a binary '1' and a low voltage represents a binary '0', or vice versa. The key characteristic is that the voltage level for a given bit is maintained for the entire duration of that bit's time slot. This simplicity in implementation and potentially higher data rates have made NRZ variations popular in various communication systems, including Ethernet and USB. However, a significant drawback of basic NRZ is its susceptibility to baseline wander and clock recovery issues, especially when long sequences of identical bits (zeros or ones) occur. This can make it difficult for the receiver to determine the precise timing of bit transitions. To mitigate these issues, various modified NRZ schemes exist, such as Non-Return-to-Zero Inverted (NRZI) and Manchester encoding, which introduce additional transitions or coding rules to ensure sufficient transitions for reliable clock synchronization. Despite its limitations, the fundamental principle of maintaining a non-zero voltage level for the duration of a bit remains the defining feature of NonReturntoZeroÜbertragung.