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- 4B5B abstract "In telecommunication, 4B5B is a form of data communications Block Coding. 4B5B maps groups of four bits onto groups of 5 bits, with a minimum density of 1 bits in the output. When NRZI-encoded, the 1 bits provide necessary clock transitions for the receiver. For example, a run of 4 bits such as 0000 contains no transitions and that causes clocking problems for the receiver. 4B/5B solves this problem by assigning each block of 4 consecutive bits an equivalent word of 5 bits. These 5 bit words are pre-determined in a dictionary and they are chosen to ensure that there will be at least two transitions per block of bits.A collateral effect of the code is that more bits are needed to send the same information than with 4 bits. An alternate to using 4B5B coding is to use a scrambler.Depending on the standard or specification of interest, there may be several 4b5b characters left unused. The presence of any of the "unused" characters in the data stream can be used as an indication that there is a fault somewhere in the link. Therefore, the unused characters can actually be used to detect errors in the data stream. 4B5B was popularized by Fiber distributed data interface (FDDI) in the mid-1980s, and was later adopted by100BASE-TX standard defined by IEEE 802.3u in 1995 andAES10-2003 MADI [1] (Multichannel Audio Digital Interface).The name "4B5B" is generally taken to mean the FDDI version. Other 4-to-5-bit codes have been used for magnetic recording and are known as group code recording (GCR).On optical fiber, the 4B5B output is NRZI-encoded. FDDI over copper (CDDI) uses MLT-3 encoding instead, as does 100BASE-TX.".
- 4B5B wikiPageExternalLink standards.
- 4B5B wikiPageExternalLink 27566-4b5b-encoder-line-codificador-de-linea-4b5b.
- 4B5B wikiPageID "1830863".
- 4B5B wikiPageRevisionID "569932913".
- 4B5B hasPhotoCollection 4B5B.
- 4B5B subject Category:Line_codes.
- 4B5B subject Category:Telecommunications_standards.
- 4B5B comment "In telecommunication, 4B5B is a form of data communications Block Coding. 4B5B maps groups of four bits onto groups of 5 bits, with a minimum density of 1 bits in the output. When NRZI-encoded, the 1 bits provide necessary clock transitions for the receiver. For example, a run of 4 bits such as 0000 contains no transitions and that causes clocking problems for the receiver. 4B/5B solves this problem by assigning each block of 4 consecutive bits an equivalent word of 5 bits.".
- 4B5B label "4B5B".
- 4B5B label "4B5B".
- 4B5B label "4B5B-Code".
- 4B5B label "Code en bloc 4B5B".
- 4B5B label "Codifica 4B/5B".
- 4B5B sameAs 4B5B-Code.
- 4B5B sameAs Code_en_bloc_4B5B.
- 4B5B sameAs 5B.
- 4B5B sameAs 4B5B.
- 4B5B sameAs m.05_dvw.
- 4B5B sameAs Q352986.
- 4B5B sameAs Q352986.
- 4B5B wasDerivedFrom 4B5B?oldid=569932913.
- 4B5B isPrimaryTopicOf 4B5B.