Fiber Channel
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206
Understanding the Basic Test Channel Frame Structure
The Fibre Channel standard defines a variable frame length consisting of 36 bytes of overhead and up to 2112
bytes of payload for a total maximum size of 2148 bytes.
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SOF and EOF
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A Start of Frame (SOF) delimiter and End of Frame (EOF) delimiter mark the beginning and
end of each Fibre Channel frame
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Available for both FC-1 and FC-2 frame formats
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Frame Header
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Is the first field of the frame content and immediately follows the SOF delimiter and is trans-
mitted on a word boundary
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Is used to control link operations and device protocol transfers as well as detect missing or out
of order frames
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Available in FC-2 frame format only
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CRC
- The Cyclic Redundancy Check (CRC)
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Is a four byte field that follows the Data Field and is used to verify the data integrity of the
Frame Header and Data Field.
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SOF and EOF delimiters are not included in the CRC verification
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The CRC field is calculated on the Frame Header and Data Field prior to encoding for trans-
mission and after decoding upon reception
Frame Delimiters
A frame delimiter is an
Ordered Set
that immediately precedes or follows the contents of a frame. Separate
and distinct delimiters shall identify the start of a frame and the end of a frame and shall be recognized when a
single Ordered Set is detected. An Ordered set is described below.
Ordered Set
An Ordered Set is a four-character combination of data and special Transmission Characters. Ordered Sets
provide the ability to obtain bit and word synchronization that also establishes word boundary alignment. The
three types of Ordered Sets are:
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