FC-2 Features
96122 • Revision: F Chapter 5 Fibre Channel Operations 53
Class of Service Parameters
Fibre Channel provides several different strategies to ensure reliable
communications between devices. These strategies are called Classes of Service.
The libraries support 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 5-6 indicates the two types of delimiters for Class 3 operations.
Note: Intermixing different classes of service is not supported.
The libraries adhere to a set of operating characteristics that ensure
inter-operability and reliability within a Class 3 loop environment are maintained.
■ TABLE 5-7 on page 54 lists the Class 3 Service Parameters, Port Login (PLOGI)
■ TABLE 5-8 on page 55 lists the Class 3 Service Parameters, Fabric Login (FLOGI)
TABLE 5-6 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
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