Education

Lec-8: Manchester encoding and differential Manchester encoding in Hindi | Computer Network

by Gate Smashers

📚 Main topics

Physical-layer encodingThe physical layer encodes digital data from upper layers into signals for transmission. The lesson focuses on digital-to-digital encoding, especially Manchester and differential Manchester. 0:00
Manchester encodingThe instructor explains how to represent bits using a transition in the middle of each bit interval, and notes that the Thomas and IEEE 802.3 conventions use opposite bit mappings. 1:01
Differential Manchester encodingIn the convention shown, 0 requires a transition at the beginning of the bit interval, while 1 has no transition there; the middle transition is maintained. 3:36

✨ Key takeaways

Manchester conventionsIf no convention is specified in an exam, the instructor recommends using IEEE 802.3. The bit representations in the two conventions are reversed. 1:01
Differential Manchester rulesTo encode the data, track the signal’s ending level from one bit to the next: 0 introduces a transition at the start, while 1 continues without one. 4:07
ExamplesThe lesson works through sample bit strings to demonstrate how to draw the signal and connect adjacent bit intervals. 1:31

🧠 Lessons learned

Track transitions carefullyIn differential Manchester, the signal’s prior level determines how to draw the next transition; choose the direction that matches the required rule for each bit. 5:09
Practice for examsThese encoding questions can appear in competitive exams, so applying the conventions consistently helps solve them. 7:14

🏁 Conclusion/next steps

Apply the rulesUse the stated convention and the bit-transition rules to encode a given data string, taking care to connect the signal across bit intervals. 7:14

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Transcript excerpt

0:00 Hello friends, welcome to Gate Smashers, In today’s video we are going to discuss difference between Manchester and differential Manchester and encoding. So the major responsibility of physical layer is transmission of data meaning data coming from upper layer is in the form of digital data in the form of 1, 0 it is not necessary that we transmit that data further in the form of 1, 0, we can transmit data in the form of analog signal or digital signal. There we need in the physical layer

0:30 to encode the data then either we do analog to analog, analog to digital, digital to analog, digital to digital these different type of encoding techniques we use, when we use digital to digital there we use Manchester and differential Manchester and encoding this is a very simple concept many times questions came on this topic, In this video I am giving you a clear cut idea how to convert data in Manchester and differential Manchester and encoding

1:01 First of all let’s start with Manchester in Manchester you have to keep in mind represent 1 in this form and 0 in this form so although there are two conventions Thomas and second is IEEE802.3 convention, So many times in exam it is mentioned that to which convention you have to do if it is not mentioned then by default you can use IEEE but here I am telling you according to Thomas IEEE is totally its reverse,

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