NRZI
E96090
NRZI (Non-Return-to-Zero Inverted) is a digital line coding scheme that represents binary data by inverting the signal level on a '1' and leaving it unchanged on a '0', commonly used in various networking and storage technologies.
Aliases (2)
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
digital encoding scheme
→
line code → |
| advantage |
improves clock recovery when data has sufficient ones density
→
reduces DC component compared to NRZ-L for random data → robust against polarity inversion of the physical medium → |
| alsoKnownAs |
NRZ-I
→
Non-Return-to-Zero Invert-on-ones → |
| applicationDomain |
computer storage
→
data communications → telecommunications → |
| belongsToClass |
non-return-to-zero codes
→
|
| bitRepresentation |
logical 0 leaves current signal state unchanged
→
logical 1 causes inversion of current signal state → |
| category |
physical layer coding
→
|
| dependsOn |
signal transitions rather than absolute levels
→
|
| disadvantage |
long runs of zeros produce no transitions
→
requires additional mechanisms to ensure sufficient transitions → |
| encodingRule |
a binary 0 is represented by no transition of the signal level
→
a binary 1 is represented by a transition of the signal level → |
| fullName |
Non-Return-to-Zero Inverted
→
|
| goal |
efficient binary data transmission over physical media
→
improve timing recovery compared to simple NRZ level coding → |
| hasProperty |
self-clocking only if data pattern has enough ones
→
transition occurs at bit boundaries only → two possible signal levels → |
| isDifferential |
true
→
|
| relatedTo |
Manchester code
→
NRZ-L → RLL (run-length limited) codes → biphase mark code → |
| requires |
bit stuffing or run-length limiting for long sequences without transitions
→
|
| signalProperty |
signal level does not return to a zero baseline between bits
→
|
| standardizedIn |
USB 2.0 specification
→
various magnetic recording standards → |
| usedIn |
HDLC-like protocols with bit stuffing
→
High-Speed USB with bit stuffing → SCSI parallel interfaces (legacy) → USB 1.x → USB 2.0 full-speed → USB 2.0 low-speed → fiber channel variants (as a component of higher-level coding) → magnetic tape recording → older floppy disk formats → optical communication systems → serial communication links → |
| usedWith |
bipolar signaling
→
differential signaling → unipolar signaling → |
Referenced by (3)
| Subject (surface form when different) | Predicate |
|---|---|
|
NRZI
("Non-Return-to-Zero Invert-on-ones")
→
|
alsoKnownAs |
|
NRZI
("Non-Return-to-Zero Inverted")
→
|
fullName |
|
100BASE-FX
→
|
usesLineCode |