Fiber Optic Wiki

Transmission words and ordered sets

July 4, 2011

All Fibre Channel communication is done in units of four 10-bit codes. This group of 4 codes is called a transmission word.

Meta-data of Fibre Channel communication

July 4, 2011

In addition to the transfer of data, it is necessary for Fibre Channel communication to include some meta-data.

Functionality of Fibre Channel

July 4, 2011

FCoE maps Fiber Channel directly over Ethernet while being independent of the Ethernet forwarding scheme. The FCoE protocol specification replaces the FC0 and FC1 layers of the Fiber Channel stack with Ethernet. By retaining the native Fiber Channel constructs, FCoE was meant to integrate with existing Fiber Channel networks and management software.

Fibre Channel over Ethernet Application

July 4, 2011

The main application of FCoE is in data center storage area networks (SANs). FCoE has particular application in data centers due to the cabling reduction it makes possible, as well as in server virtualization applications, which often require many physical I/O connections per server.

FCoE Frame Format

July 4, 2011

FCoE is encapsulated over Ethernet with the use of a dedicated Ethertype, 0x8906. A single 4-bit field (version) satisfies the IEEE sub-type requirements. The SOF (start of frame) and EOF (end of frame) are encoded as specified in RFC 3643. Reserved bits are present to guarantee that the FCoE frame meets the minimum length requirement of Ethernet. Inside the encapsulated Fiber Channel frame, the frame header is retained so as to allow connecting to a storage network by passing on the Fiber Channel frame directly after de-encapsulation.

Fibre Channel Timeline

July 4, 2011

The FCoE standardization activity started in April 2007. The FCoE technology was defined as part of the INCITS T11 FC-BB-5 standard that was forwarded to ANSI for publication in June 2009.The FC-BB-5 standard was published in May 2010 as ANSI/INCITS 462-2010.

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