Line codes Line codes Two-binary, one-quaternary (2B1Q) is a physical layer encoding used for Integrated Services Digital Network (ISDN) basic rate interface. 2B1Q uses four signal levels (1Q), equivalent to two bits (2B). Other encoding techniques are B8ZS, AMI or HDB3. ...more on Wikipedia about "2B1Q"
In telecommunications, 8B/10B is a line code that maps 8-bit symbols to 10-bit symbols to achieve DC balance and bounded disparity, and yet provide enough state changes to allow reasonable clock recovery. This means that there are just as many "1"s as "0"s in a string of two symbols, and that there are not too many "1"s or "0"s in a row. This is an important attribute in a signal that needs to be sent at high rates because it helps reduce " intersymbol interference". The code was described in 1983 by Al Widmer and Peter Franaszek in the IBM Journal of Research and Development. IBM was issued a patent for the scheme the following year. ...more on Wikipedia about "8B/10B encoding"
Alternate Mark Inversion (AMI) is a line encoding technique ( line code) for T1s. This three-level system uses positive, negative, and grounded pulses (e.g. -5V, 0V, 5V) to represent logical values. A logical 0 is represented with a grounded or absent pulse, and a logical 1 by pulses of alternating polarity. The alternating coding prevents the build-up of a DC voltage in the cable. This is considered an advantage since the cable may be used to carry an additional small DC current to power intermediate equipment such as line repeaters. This DC component may be removed without interfering with this encoded information. ...more on Wikipedia about "Alternate Mark Inversion"
B3ZS is an abbreviation for bipolar with three-zero substitution, a T-carrier line code in which bipolar violations are deliberately inserted if the stream of user data contains a string of 3 or more consecutive zeros. ...more on Wikipedia about "B3ZS"
B6ZS: Abbreviation for bipolar with six-zero substitution . In telecommunications, a T-carrier line code in which bipolar violations are deliberately inserted if user data contain a string of 6 or more consecutive zeros. ...more on Wikipedia about "B6ZS"
B8ZS is an abbreviation for bipolar with eight-zero substitution. A method of line coding used in the T-carrier system which allows full 64 kbit/s per second per channel. ...more on Wikipedia about "B8ZS"
The Biphase Mark Code is a type of encoding for binary data streams. ...more on Wikipedia about "Biphase Mark Code"
In data transmission and telecommunication, bit stuffing (also known -- uncommonly -- as positive justification) is the insertion of noninformation bits into data. Stuffed bits should not be confused with overhead bits. ...more on Wikipedia about "Bit stuffing"
Data strobe encoding (or D/S encoding) is an encoding scheme for transmitting data in digital circuits. ...more on Wikipedia about "Data strobe encoding"
A differential encoding is an encoding in which signal significant conditions represent binary data, such as "0" and "1", and are represented as changes to succeeding values rather than with respect to a given reference. ...more on Wikipedia about "Differential encoding"
Differential Manchester encoding is a method of encoding data in which (a) data and clock signals are combined to form a single self- synchronizing data stream, (b) one of the two bits, i.e., "0" or "1", is represented by no transition at the beginning of a pulse period and a transition in either direction at the midpoint of a pulse period, and (c) the other is represented by a transition at the beginning of a pulse period and a transition at the midpoint of the pulse period. ...more on Wikipedia about "Differential Manchester encoding"
Eight-to-Fourteen Modulation (EFM) is an encoding technique used by CDs and MiniDiscs. EFM belongs to the class of DC-free Run Length Limited (RLL) codes because it ensures that a) the spectrum (power density function) of the encoded sequence vanishes at the low-frequency end and b) both the minimum and maximum number of consective bits of the same kind are within specified bounds. ...more on Wikipedia about "Eight-to-Fourteen Modulation"
HDB3 (High-density bipolar-3 zeros) is a telecommunications line code mainly used in Japan, Europe and Australia (for example, in E-1 lines) and is based on AMI. It is also very similar to the B8ZS encoding used in T-1 lines. ...more on Wikipedia about "HDB3"
In telecommunication, the term intersymbol interference (ISI) has the following meanings: ...more on Wikipedia about "Intersymbol interference"
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Jaxon modulation is a modulation system for placing information on a bitstream generated by a finite generator. ...more on Wikipedia about "Jaxon modulation"
In telecommunication, a line code is a code chosen for use within a communications system for transmission purposes. ...more on Wikipedia about "Line code"
In telecommunication, Manchester code is a form of data communications line code in which each bit of data is signified by at least one transition. Manchester encoding is therefore considered to be self-clocking, which means that accurate synchronisation of a data stream is possible. Each bit is transmitted over a predefined time period. ...more on Wikipedia about "Manchester code"
MLT-3 (Multilevel Transmission Encoding - 3 levels) is used by 100BASE-TX Ethernet. ...more on Wikipedia about "MLT-3 Encoding"
Modified Frequency Modulation, commonly MFM, is a line code used by most floppy disk formats, notably by most CP/M machines, as well as PCs running DOS. ...more on Wikipedia about "Modified Frequency Modulation"
In telecommunication, a non-return-to-zero (NRZ) line code is a binary code in which "1s" are represented by one significant condition and "0s" are represented by another, with no neutral or rest condition, such as a zero amplitude in pulse amplitude modulation (PAM), zero phase shift in phase-shift keying (PSK), or mid- frequency in frequency-shift keying (FSK). The pulses have more energy than a RZ code, but it does not have a rest state, which means a synchronization signal must also be sent alongside the code. ...more on Wikipedia about "Non-return-to-zero"
Non return to zero, inverted (NRZI) is a method of mapping a binary signal to a physical signal for transmission over some transmission media. The two level NRZI signal has a transition at a clock boundary, if the bit being transmitted is a logical one, and does not have a transition if the bit being transmitted is a logical zero. ...more on Wikipedia about "Non-return-to-zero, inverted"
In telecommunication, a paired disparity code is a code in which some or all of the characters are represented by two sets of digits of opposite disparity that are used in sequence so as to minimize the total disparity of a longer sequence of digits. ...more on Wikipedia about "Paired disparity code"
Return-to-zero (RZ) describes a line code used in telecommunications signals in which the signal drops (returns) to zero between each pulse. This takes place even if a number of consecutive zeros or ones occur in the signal. This means that a separate clock does not need to be sent alongside the signal. The signal is self-clocking. A variant, Return-to-zero, inverted, swaps the signal values for one and zero. ...more on Wikipedia about "Return-to-zero"
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