Seagate Fibre Channel Interface - Manual (Page 65)

Fibre Channel Interface Manual, Rev. D 51
9.0 Fibre Channel link services
Link service frames are used to perform functions at the Fibre Channel layer. They are used to establish the
operating parameters, perform channel level error recovery, and check the status of the physical link between
two devices. Link service frames are divided into two groups, Basic and Extended.
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