Manchester code
The Manchester code is a binary encoding which also encodes the clock signal. This is very useful, because an external clock signal is no longer needed. A seque…
The Manchester code is a binary encoding which also encodes the clock signal. This is very useful, because an external clock signal is no longer needed. A sequence of bits modulates[disambiguation needed] the phase of the signal. This is a form of Phase shift keying, often shortened to PSK.
Otherwise put, the information about the signal is in its signal flanks, that is when the signal changes.
Manchester codes are widely used, for example for Ethernet or for RFID.
Representation
There are two ways to represent a Manchester code:
- A falling signal flank represents a logical 1 and ascending flank is a logical 0. This is the original definition given by G.E. Thomas
- A falling signal flank is a logical 0, the ascending one a logical 1. This is the definition used by the original Ethernet standard.
To rule out ambiguities, Manchester codes use a preamble. A preamble is a fixed sequence that is known beforehand.
Advantages and disadvantages
One of the advantages of Manchester code is that the DC component of the signal carries no information. This makes it possible that standards that usually do not carry power can transmit this information. One of the drawbacks of the encoding is that it needs more bandwidth than other encodings, such as NRZ.
Content Disclaimer
Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.
- The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
- There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
- It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
- Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
- Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.