How to adjust ADSL SNR offset?

Installing and Using OpenWrt
16

SNR for VDSL2 look like this in config network

/etc/config/network
config dsl 'dsl'
        option annex 'b'
        option tone 'av'
        option ds_snr_offset '-39'

mean -3,9dB from target SNR . Target SNR is 9dB for my line so result 5.1dB
Also resync is required by:

/etc/init.d/dsl_control stop
/etc/init.d/dsl_control start

lantiq is well known to sync below broadcom or even below its max. attainable data rate .Values from -5 to -10 are desirable.

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