Annex A and Annex B settings are applicable to hardware and ADSL. Annex modes are not valid for VDSL. Those who tell you to choose Annex A for VDSL seem to mislead you as they are not knowledgeable about the subject. For VDSL, upload and download channels are set as the operator wishes, and you cannot change this.
The operator (Turk Telekom) can allocate more download bandwidth to subscribers who are given less upload speed, or the download and upload channels of a 16 Mbps package user and a 100 Mbps package user are not the same. DSL-AX82U or other brand modems automatically comply with this.
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