class of service


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Related to class of service: Quality of service

class of service

(1) A classification assigned to users of a telephony network that gives them particular rights and privileges. In an internal telephone system, it can include the ability to make international calls or dial 900 numbers. In the public telephone network, it is used for tariffs and differentiates between categories such as residential or commercial, flat rate or message units, private line or party line.

(2) In an enterprise network, class of service (CoS) differentiates high-priority traffic from lower-priority traffic. Tags may be added to the packets to identify such classes, but they do not guarantee delivery as do quality of service (QoS) functions, which are implemented in the network devices. See QoS.
References in periodicals archive ?
Intelligent switches, on the other hand, typically offer a host of management capabilities including manual port configuration for items like speed and duplexing, VLAN membership, and Class of Service (CoS).
According to BT, their solution provides Donaldson with the flexibility to try out MPLS on a single class of service basis as well as the ability to roll out the service or new classes of service to new sites in the future over a short timescale.
Business Premier - the highest class of service - will have a fast-track 10 minute check-in through passport control plus a seated meal/drink service on board.