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1) Class of service
The
indication of how an upper-layer protocol requires that a lower-layer protocol
treat its messages. In SNA subarea routing, COS definitions are used by subarea
nodes to determine the optimal route to establish a given session. A COS
definition comprises a virtual route number and a transmission priority field.
Also called TOS (type of service).
2) Corporation for Open
Systems
An organization that promulgates the use of OSI protocols through
conformance testing, certification, and related activities.
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