---
title: "List digital-to-digital line coding techniques"
subject: "Data Communication"
chapter: 5
key: "semester_5/data_communication:line-coding-techniques-list"
source: https://www.bctengineer.com/q/semester_5/data_communication/line-coding-techniques-list
site: BCT Engineering
---

# List digital-to-digital line coding techniques

Data Communication · Chapter 5: Data Encoding and Modulation

- Asked in: 2075 Chaitra, 2 marks
- Video: [Line Coding Techniques | RZ, NRZ, Unipolar, Polar, Bipolar & Manchester | Digital Communication](https://www.youtube.com/watch?v=daf9F9NC7zQ) — Engineering Funda
- Answer checked by Claude Sonnet 5.5 on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/data_communication/line-coding-techniques-list
- Whole chapter: https://www.bctengineer.com/md/semester_5/data_communication/chapter-5

## Question

List digital-to-digital line encoding techniques.

## Short answer

Unipolar: NRZ, RZ. Polar: NRZ-L, NRZ-I, RZ, Manchester, Differential Manchester. Bipolar: AMI, Pseudoternary. Multilevel: 2B1Q, 8B6T, 4D-PAM5. Multitransition: MLT-3. Scrambling: B8ZS, HDB3.

## Answer

Digital-to-digital line coding techniques are grouped as:
1. **Unipolar**: NRZ, RZ.
2. **Polar**: NRZ-L, NRZ-I, RZ, Manchester, Differential Manchester.
3. **Bipolar**: AMI (alternate mark inversion), pseudoternary.
4. **Multilevel**: 2B1Q, 8B6T, 4D-PAM5.
5. **Multitransition**: MLT-3.
6. **Scrambling**: B8ZS, HDB3 (used with bipolar coding).

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Which are scrambling techniques?
   A. AMI and MLT-3
   B. B8ZS and HDB3
   C. NRZ and RZ
   D. 2B1Q and 8B6T
   Answer: B. Used with bipolar. (Key point: Scrambling)

2. Which are multilevel?
   A. NRZ-L, NRZ-I
   B. B8ZS
   C. 2B1Q, 8B6T, 4D-PAM5
   D. MLT-3 only
   Answer: C. Multilevel. (Key point: Multilevel)

3. Bipolar schemes include:
   A. Manchester
   B. NRZ-I
   C. MLT-3
   D. AMI and pseudoternary
   Answer: D. Bipolar. (Key point: Bipolar)

## Related in Data Communication

- [Line coding: properties; encode 01001100011](https://www.bctengineer.com/question.md?key=semester_5%2Fdata_communication%3Aline-coding-01001100011) — Data Communication, chapter 5
- [Dataword vs codeword; error coding techniques](https://www.bctengineer.com/question.md?key=semester_5%2Fdata_communication%3Adataword-codeword-error-coding) — Data Communication, chapter 8
- [B8ZS line coding](https://www.bctengineer.com/question.md?key=semester_5%2Fdata_communication%3Ab8zs-coding) — Data Communication, chapter 5, asked 2×
- [HDB3 (HD3S) line coding](https://www.bctengineer.com/question.md?key=semester_5%2Fdata_communication%3Ahdb3-coding) — Data Communication, chapter 5, asked 2×
- [Line coding waveforms for 1101110111](https://www.bctengineer.com/question.md?key=semester_5%2Fdata_communication%3Aline-coding-1101110111) — Data Communication, chapter 5
- [Line coding: polar RZ and bipolar AMI](https://www.bctengineer.com/question.md?key=semester_5%2Fdata_communication%3Aline-coding-polar-rz-ami) — Data Communication, chapter 5

## Related in other subjects

- [Line coding in PCM and the right technique](https://www.bctengineer.com/question.md?key=semester_8%2Ftelecommunications%3Aline-coding-pcm-solution) — Telecommunications, chapter 3
- [Digital communication system elements; Shannon-Fano coding](https://www.bctengineer.com/question.md?key=semester_6%2Fcommunication_systems%3Adcs-block-shannon-fano) — Communication Systems, chapter 6
- [Line coding and NRZ, RZ, AMI](https://www.bctengineer.com/question.md?key=semester_8%2Ftelecommunications%3Aline-coding-nrz-rz-ami) — Telecommunications, chapter 3
- [Digital carrier system and multiplexing techniques](https://www.bctengineer.com/question.md?key=semester_8%2Ftelecommunications%3Adigital-carrier-multiplexing) — Telecommunications, chapter 3