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Fiber Channel
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Frame Delimiters
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(SOF)
Start-of-Frame
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(EOF)
End-of-Frame
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Primitive Signals
A Primitive Signal is an Ordered Set designated to have special meaning. All FC_Ports shall at a
minimum recognize R_RDY and IDLE Primitive Signals. All Primitive Signals not recognized by the
FC_Port shall be treated as an IDLE.
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Idle:
Idle is a Primitive Signal transmitted on the link to indicate that link initialization is com-
plete and to maintain link synchronization
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(R_RDY)
Receiver Ready
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Primitive Sequence
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(OLS)
Off-line
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(NOS)
Not Operational
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(LR)
Link Reset
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(LRR)
Link Reset Response
Start of Frame (SOF) and End of Frame (EOF) Delimiter setup
The Start-of-Frame (SOF) delimiter is an Ordered Set that immediately precedes the frame content. There are
multiple SOF delimiters defined for Sequence control. SOF indicates that a Frame will immediately follow and
indicates which class of service the Frame will use.
The value of the SOF field determines the class of service associated with the FC frame. Several Classes of
service are specified in Fiber Channel but only Classes 1,2,3 & 4 are described below. Classes 1, 2, and 3 are
topology independent, however, Classes 4 and 6 require a Fabric. If the Fabric is not present, the service is
provided as a special case of point-to-point. FC_Ports are not required to support all classes of service.
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Class 1:
Dedicated physical connection with delivery confirmation. This class of service has three
phases:
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Setting up the connection
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Transferring the information
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