Your wifi clients are not equally efficient on the upload vs. downloads. This can vary by client. In addition, since the transmit power of clients can differ from the transmit power of the access point, that is another reason for them to be different. In other words, it is not mandatory or expected that your upload exactly matches your downloads...there are reasons why it would be different.
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Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
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