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Spirent KB Article
Doc ID: FAQ16072
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Avalanche: Which 1Gig ports must be connected for a back port test on SPT-C1?
For running back to back test, you must connect port 1 to port 3 or port 2 to port 4.
Note: the 1G ports on C1 are auto detect that can take crossover or straight through cables.
Product : Avalanche