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Spirent KB Article
Doc ID: FAQ15422
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Spirent TestCenter: Is it possible in 2544 test can the stream block % sent BW be assigned per stream block?
The 2544 scheduler is port-based meaning all the streams within a test will be sent at the same rate. It is not possible to control the rate per stream. For example, if you have 4 streams configured, the scheduler will equally allocate each stream 25% rate. Once the test runs, the default scheduler is always “Port-Based”. This is the default behavior and by design.
Product : Windows GUI,RFC 2544,PGA