Fibre Channel Link Services
Link services provide a number of architected functions that are available to the users of the Fibre Channel port. There are three types of link services defined, depending upon the type of function provided and whether the frame contains a payload. They are basic link services, extended link services, and FC-4 link services (generic services).
Basic link service commands support low-level functions like aborting a sequence (ABTS) and passing control bit information. Extended link services (ELS) are performed in a single exchange. Most of the ELSs are performed as a two sequence exchange: a request from the originator ...
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