Throughput. The throughput of an IP service is a measure that applies to a particular pair of source and destination IP address. It is defined in two variants: the IP Packet Throughput (IPPT) and the Octet based IP Packet Throughput (IPOT). The IPPT indicates the number of packets per second the service can handle, and the IPOT indicates the accumulated number of octets in those packets that the service can handle. About the SLA parameter throughput the following observations apply: • Throughput is important. Example: a video stream is defined at 1 MBit, and only useful at 1 MBit. At 0.9 MBit, it cannot be displayed. Another: company wants to synchronize its various data bases outside business hours, not during peak sales hours. • In case of different service classes, throughput applies for each individual service class, and can be different per class. • The parameters also depend on source address and/or destination address (differences between local traffic, long-distance traffic etc.). In this aspect the model of the network infra- structure as a set of ‘pipes’ with QoS attributes becomes evident. • Service Throughput can depend on time of day/day of week etc. Either the value for this param- eter applies always (also in peak hour), or there might be different values for different times (inside or outside business hours).
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