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rdfs:label
64b/66b encoding 64b66b-Code
rdfs:comment
In data networking and transmission, 64b/66b is a line code that transforms 64-bit data to 66-bit line code to provide enough state changes to allow reasonable clock recovery and alignment of the data stream at the receiver. It was defined by the IEEE 802.3 working group as part of the IEEE 802.3ae-2002 amendment which introduced 10 Gbit/s Ethernet. At the time 64b/66b was deployed, it allowed 10 Gb Ethernet to be transmitted with the same lasers used by SONET OC-192, rather than requiring the 12.5 Gbit/s lasers that were not expected to be available for several years. Der 64b/66b-Code ist ein Leitungscode, welcher ein 64 bit-Datenwort in ein 66 bit-Codewort abbildet. Anwendung findet dieser Leitungscode im Rahmen von Gigabit-Ethernet, wie 10-Gigabit-Ethernet, 40-Gigabit-Ethernet und 100-Gigabit-Ethernet. Der 64b/66b-Leitungscode ist völlig anders aufgebaut und hat andere spektrale und statistische Eigenschaften als z. B. der 8b10b-Code.
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Der 64b/66b-Code ist ein Leitungscode, welcher ein 64 bit-Datenwort in ein 66 bit-Codewort abbildet. Anwendung findet dieser Leitungscode im Rahmen von Gigabit-Ethernet, wie 10-Gigabit-Ethernet, 40-Gigabit-Ethernet und 100-Gigabit-Ethernet. Der 64b/66b-Leitungscode ist völlig anders aufgebaut und hat andere spektrale und statistische Eigenschaften als z. B. der 8b10b-Code. Wie jeder Leitungscode dient er dazu, eine Nutzdatenfolge spektral an die physikalischen Anforderungen des Übertragungsmediums wie einer Leitung anzupassen. Durch die Art der Umsetzung wird insbesondere die Gleichanteilsfreiheit der erzeugten Codefolge gewährleistet, was die Übertragung über Impulstransformatoren erlaubt, welche keinen Gleichanteil im Signal passieren lassen. Impulstransformatoren werden im Bereich der physischen Ethernet-Schnittstelle zur galvanischen Trennung eingesetzt. Außerdem ist im Rahmen der 64b/66b-Codierung garantiert, dass der Empfänger aus dem Codewort den Takt rückgewinnen kann. Dies ist notwendig, damit der Empfänger erkennen kann, zu welchen Zeitpunkten ein bestimmter Zustand übertragen wird. In data networking and transmission, 64b/66b is a line code that transforms 64-bit data to 66-bit line code to provide enough state changes to allow reasonable clock recovery and alignment of the data stream at the receiver. It was defined by the IEEE 802.3 working group as part of the IEEE 802.3ae-2002 amendment which introduced 10 Gbit/s Ethernet. At the time 64b/66b was deployed, it allowed 10 Gb Ethernet to be transmitted with the same lasers used by SONET OC-192, rather than requiring the 12.5 Gbit/s lasers that were not expected to be available for several years. The protocol overhead of a coding scheme is the ratio of the number of raw payload bits to the number of raw payload bits plus the number of added coding bits. The overhead of 64b/66b encoding is 2 coding bits for every 64 payload bits or 3.125%. This is a considerable improvement on the 25% overhead of the previously-used 8b/10b encoding scheme, which added 2 coding bits to every 8 payload bits. The overhead can be reduced further by doubling the payload size to produce the 128b/130b encoding used by PCIe 3.0.
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