上傳跑不到4M問題

上傳跑不到4M 請查修人員來我家看 不管打哪1對都依樣上傳SNR上不來 奇怪只前19.8dB不知道怎麼原因變成勝6.1dB 跟它說是不是黑色電纜問題　查修人員幫我報上去 結果上面人死不太想幫我電纜樣子　硬要稱那條電纜 換一條電纜怎麼困難嗎
============================================================================
VDSL Training Status: Showtime
VDSL Profile: PROF_17A
Traffic Type: PTM
============================================================================
VDSL Port Details Upstream Downstream
Line Rate: 9.413 Mbps 16.055 Mbps
Actual Net Data Rate: 3.600 Mbps 12.799 Mbps
SNR Margin: 6.1 dB 25.3 dB
Actual Delay: 5 ms 5 ms
Transmit Power: 9.5 dBm 13.0 dBm
Receive Power: -10.3 dBm -4.9 dBm
Actual INP: 17 symbols 19 symbols
Total Attenuation: 19.8 dB 18.0 dB
Attainable Net Data Rate: 3.610 Mbps 43.888 Mbps

以前10M/2M數據
Anime Dance Mix - God Is A Girl
============================================================================
VDSL Port Details Upstream Downstream
Line Rate: 2.076 Mbps 10.117 Mbps
Actual Net Data Rate: 2.048 Mbps 10.047 Mbps
Trellis Coding: ON ON
SNR Margin: 22.9 dB 29.7 dB
Actual Delay: 5 ms 5 ms
Transmit Power: 9.3 dBm 12.7 dBm
Receive Power: -15.2 dBm -6.8 dBm
Actual INP: 17.0 symbols 18.0 symbols
Total Attenuation: 24.5 dB 19.5 dB
Attainable Net Data Rate: 9.207 Mbps 49.500 Mbps
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 12.9 41.6 66.2 N/A 19.5 50.9 85.5
Signal Attenuation(dB): 8 .2 41.0 N/A N/A 19.5 50.9 N/A
SNR Margin(dB): 23.7 22.9 N/A N/A 29.7 0 .0 N/A
Transmit Power(dBm):-7 .1 9 .2 -128.0 N/A 12.7 -128.0 N/A
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只前數據