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802.11N MCS related issue of AIR-CT2504-K9 & AIR-LAP1142N-T-K9

Falcon Chung
Level 1
Level 1
The story is:

After I set MCS parameter to 8 as below:

內置圖片 1


then, the data rate of STA shows Tx=5.5, Rx=39.0, as you can see below:
內置圖片 2


Isn't the data rate supposed to be 14 Mbps@MCS 8(20MHz, short GI)?

How's the values 5.5 / 39 would happen?

Would anyone could explain it please?

Thank you very much.