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42 Chapter 1
SNA Terms and Concepts
Basic SNA Concepts
Class of Service
Class of service (COS) is a definition of the transport network (data link
control and path control) characteristics—such as route security,
transmission priority, and bandwidth—that the local node can use to
establish a particular session. The COS definition assigns relative values
to factors such as acceptable levels of security, cost per byte, cost per
connect-time, propagation delay, and effective capacity.
In a subarea network, a COS is derived from the mode associated with a
session, as defined in the host system.
APPN network nodes use the COS to compute session routes between
independent LUs. For more information about session routing in APPN
networks, see “Session Routing”.