Symbol 4B/5B, 8B/10B Encoding
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Data transmission may be “coded” in different formats. In an optical network, a pulse of light will represented by a 1 (one) bit and no light will present a digital zero bit.
Symbol Encoding 4B/5B - four bits are represented by a five bit symbol - 16 of the possible 32 bit (symbols) are chosen in a way that any combination does not allow more than three zeros in a row. This yields symbols used for transmission of control information. 4B/5B is used in Fast Ethernet and FDDI [Fiber Distributed Data Interface]. 8B/10B coding is used in Gigabit Ethernet. 8B/6T coding is used in Fast Ethernet. 66B coding is used in ten Gigabit Ethernet.
[tags]symbol 4B/5B, 8B/10B, encoding, digital zero bit, data transmission[/tags]
3 Comments
dattatreya
April 16th, 2007
at 12:19am
please tell me how 4b to 5b conversion is done. please it is very urgent. u can send it to my e-mail ID
Thanking you
Cee
October 30th, 2007
at 8:31pm
I would think that you would use a “look up table” (LUT) that matched your 4-bit “nibble” to a 5-bit pattern for transmission, then send this out through a “serializer” for single-wire transmission.
aslan
December 23rd, 2007
at 5:27am
Please tell me how 3b4b or 5b6b or 8b10b tables created?
you can send to my email
Thanks