求教一个ADSL线路问题

DGPhil

Link Information                       

Uptime:        0 days, 13:21:26

Modulation:        G.DMT Annex A [POTS Overlay Mode]

Bandwidth (Up/Down) [kbps/kbps]:        640 / 3.008

Data Transferred (Sent/Received) [MB/MB]:        12,57 / 51,33

Output Power (Up/Down) [dBm]:        12,0 / 18,5

Line Attenuation (Up/Down) [dB]:        9,0 / 13,0

SN Margin (Up/Down) [dB]:        18,0 / 31,0

Vendor ID (Local/Remote):        ALCB / ALCB

Loss of Framing (Local/Remote):        0 / 0

Loss of Signal (Local/Remote):        0 / 0

Loss of Power (Local/Remote):        0 / 0

Loss of Link (Remote):        0

Error Seconds (Local/Remote):        0 / 245

FEC Errors (Up/Down):        0 / 0

CRC Errors (Up/Down):        248 / 0

HEC Errors (Up/Down):        77 / 0

北京联通的ADSL
这个ADSL线路的诊断，是不是有问题？
晚上会频繁丢包，我应该如何解决呢？换电话线？