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What (who) is NRZI$505046$ - definition

A LINE CODE

4b5b; 4B/5B-NRZI; 4B-5B; 4B/5B; 4b/5b encoding

Non-return-to-zero

LINE CODE IN WHICH THE SIGNAL VALUE DOES NOT RETURN TO ZERO AFTER EACH PULSE

Non-return-to-zero, inverted; NRZI; Non return to zero; Non return to zero, inverted; Non-return-to-zero space; Nrz-l; Polar encoding; NRZ encoding; NRZ-L; NRZ-I; NRZS; NRZM; NRZL; Non-Return-to-Zero; Non-Return-to-Zero Inverted; Non-return to zero; NRZI-S; SNRZI; Synchronized NRZI; Randomized NRZ; Randomized NRZI; RNRZI; RNRZ; Randomised NRZI; Randomised NRZ; Synchronised NRZI; NRZ-S; NRZ-M; NRZ(M); NRZ(S); NRZ(I); NRZ(L); NRZ-C; NRZC; NRZ(C); Inhibit code; IBM code; Non-Return to Zero; Non-Return to Zero Inverting; Non-return to zero inverting; Non-return-to-zero inverting; Non-return-to-zero-inverting

In telecommunication, a non-return-to-zero (NRZ) line code is a binary code in which ones are represented by one significant condition, usually a positive voltage, while zeros are represented by some other significant condition, usually a negative voltage, with no other neutral or rest condition.

https://en.wikipedia.org/wiki/Non-return-to-zero

4B5B

In telecommunication, 4B5B is a form of data communications line code. 4B5B maps groups of 4 bits of data onto groups of 5 bits for transmission.

https://en.wikipedia.org/wiki/4B5B

NRZI

LINE CODE IN WHICH THE SIGNAL VALUE DOES NOT RETURN TO ZERO AFTER EACH PULSE

Non-return-to-zero, inverted; NRZI; Non return to zero; Non return to zero, inverted; Non-return-to-zero space; Nrz-l; Polar encoding; NRZ encoding; NRZ-L; NRZ-I; NRZS; NRZM; NRZL; Non-Return-to-Zero; Non-Return-to-Zero Inverted; Non-return to zero; NRZI-S; SNRZI; Synchronized NRZI; Randomized NRZ; Randomized NRZI; RNRZI; RNRZ; Randomised NRZI; Randomised NRZ; Synchronised NRZI; NRZ-S; NRZ-M; NRZ(M); NRZ(S); NRZ(I); NRZ(L); NRZ-C; NRZC; NRZ(C); Inhibit code; IBM code; Non-Return to Zero; Non-Return to Zero Inverting; Non-return to zero inverting; Non-return-to-zero inverting; Non-return-to-zero-inverting

Non Return to Zero Inverted

Wikipedia

4B5B

In telecommunication, 4B5B is a form of data communications line code. 4B5B maps groups of 4 bits of data onto groups of 5 bits for transmission. These 5-bit words are pre-determined in a dictionary and they are chosen to ensure that there will be sufficient transitions in the line state to produce a self-clocking signal. A collateral effect of the code is that 25% more bits are needed to send the same information.

An alternative to using 4B5B coding is to use a scrambler. Some systems use scramblers in conjunction with 4B5B coding to assure DC balance and improve electromagnetic compatibility.

Depending on the standard or specification of interest, there may be several 5-bit output codes left unused. The presence of any of the unused codes in the data stream can be used as an indication that there is a fault somewhere in the link. Therefore, the unused codes can be used to detect errors in the data stream.

https://en.wikipedia.org/wiki/4B5B