
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”.
Comentários a estes Manuais