Sun Oracle Storage Tek T10000, Reference Manual

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E20425-01 • Chapter 3 Operations 27
FC Class 3
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FC Class 3
Fibre Channel provides several different strategies to ensure reliable
communications between devices. These strategies are called Classes of
Service. The tape drive supports the Class 3 level of service which provides
no notification of frame delivery or non-delivery. This class of service reduces
the number of frames (traffic) on the loop.
The start-of-frame (SOF) delimiter specifies the type of service used for each
frame during communications.
Table 13 indicates the two types of delimiters for Class 3 operations.
Note: Intermixing different classes of service is not supported.
The tape drives adhere to a set of operating characteristics that insure inter-
operability and reliability within a Class 3 loop environment is maintained.
Table 14 and Table 15 list Class 3 Service Parameters supported.
Class 3 Service Parameters, Port Login
Table 14 lists Class 3 Service Parameters for Port Login (PLOGI):
Table 13. Start of Frame Delimiters, Class 3
Delimiter Abbreviation Transmission Word Characters
SOF Initiate Class 3 SOFi3 K28.5 D21.5 D22.2 D22.2
SOF Normal Class 3 SOFn3 K28.5 D21.5 D22.1 D22.1
Table 14. Class 3 Service Parameters, Port Login
Parameters Word Bits StorageTek Value FC-
Tape
2FC
N_Port
2FC
NL_Port
4FC
N_Port
Class validity 0 31 1 1 1 1
Service Options : 0 30–16
Intermix Mode 0 30 0 0 0 –
Stacked Connect Requests 0 29–28 00 00 00 –
Sequential Delivery 0 27 0 0 0 –
Dedicated Simplex 0 26 0 0 0 –
Camp-On 0 25 0 0 0 –
Buffered Class 1 0 24 0 0 0 –
Priority 0 23 0 0 0 –