Manchester encoding
E74022
Manchester encoding is a digital line code that represents each data bit with a transition in the middle of the bit period, providing both clock and data synchronization on the same signal.
Aliases (2)
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
baseband line coding scheme
→
binary line code → digital line code → |
| advantage |
good timing information in signal
→
robust against long runs of identical bits → simplifies receiver clock recovery → |
| alsoKnownAs |
biphase-level encoding
→
phase encoding → |
| applicationDomain |
computer networking
→
digital electronics → telecommunications → |
| bitRepresentation |
logical 0 represented by high-to-low transition in IEEE 802.3
→
logical 0 represented by low-to-high transition in G.E. Thomas convention → logical 1 represented by high-to-low transition in G.E. Thomas convention → logical 1 represented by low-to-high transition in IEEE 802.3 → |
| category |
line codes with guaranteed transitions
→
|
| clockToDataRatio |
clock frequency equals bit rate
→
|
| definedIn |
IEEE 802.3 standard
→
|
| disadvantage |
lower spectral efficiency than some other codes
→
requires higher bandwidth than NRZ → |
| encodingRule |
each bit period contains at least one transition
→
|
| errorDetectionProperty |
missing transition indicates potential error
→
|
| hasProperty |
DC-balanced
→
self-clocking → synchronous → transition-based → |
| inventedBy |
G.E. Thomas
→
|
| namedAfter |
University of Manchester
→
|
| provides |
clock recovery
→
data synchronization → |
| relatedTo |
NRZ encoding
→
biphase mark code → differential Manchester encoding → |
| requires |
doubling of fundamental bandwidth compared to NRZ
→
|
| robustnessProperty |
tolerant to baseline wander
→
|
| signalLevel |
typically uses two voltage levels
→
|
| spectralProperty |
main spectral energy around bit rate frequency
→
no DC component in ideal case → |
| synchronizationMethod |
embedded clock in data transitions
→
|
| transitionTiming |
optional transition at bit boundary for consecutive identical bits
→
transition occurs at middle of bit period → |
| usedFor |
short to medium distance digital transmission
→
|
| usedIn |
Ethernet
→
IEEE 802.3 10BASE-T → RFID communication systems → infrared data communication → low-speed wired digital links → |
| uses |
mid-bit transition to encode data
→
|