SnowGround 发表于 2010-6-17 15:09:38

请高手帮忙看一下，我的网络倒底使用哪一种调制模式最适合：

如题，深圳电信的6+2：
先上T1.413：

Mode:T1.413
Type:Interleave
Line Coding:Trellis On
Status:No Defect
Link Power State:L0

DownstreamUpstream
SNR Margin (dB):18.6 26.0
Attenuation (dB):20.0 8.5
Output Power (dBm):11.9 19.8
Attainable Rate (Kbps):11488 1236
Rate (Kbps):8160 512
K (number of bytes in DMT frame):256 17
R (number of check bytes in RS code word):6 12
S (RS code word size in DMT frame):0.5 4
D (interleaver depth):64 4
Delay (msec):8 4



然后G.DMT：

Mode:G.DMT
Type:Interleave
Line Coding:Trellis On
Status:No Defect
Link Power State:L0

DownstreamUpstream
SNR Margin (dB):18.6 27.0
Attenuation (dB):20.0 8.5
Output Power (dBm):12.3 19.8
Attainable Rate (Kbps):11488 1292
Rate (Kbps):8160 512
K (number of bytes in DMT frame):256 17
R (number of check bytes in RS code word):6 12
S (RS code word size in DMT frame):0.5 4
D (interleaver depth):64 4
Delay (msec):8 4


Adsl2：

Mode:ADSL2
Line Coding:Trellis On
Status:No Defect
Link Power State:L0

DownstreamUpstream
SNR Margin (dB):10.6 28.6
Attenuation (dB):18.0 8.4
Output Power (dBm):12.6 18.7
Attainable Rate (Kbps):12184 1164
Rate (Kbps):8189 509
MSGc (number of bytes in overhead channel message):65 16
B (number of bytes in Mux Data Frame):46 47
M (number of Mux Data Frames in FEC Data Frame):1 4
T (Mux Data Frames over sync bytes):5 1
R (number of check bytes in FEC Data Frame):16 16
S (ratio of FEC over PMD Data Frame length):0.1829 11.8014
L (number of bits in PMD Data Frame):2756 141
D (interleaver depth):256 2
Delay (msec):11 5


Adsl 2+(禁用AnnexM支持)：

Mode:ADSL2+
Line Coding:Trellis On
Status:No Defect
Link Power State:L0

DownstreamUpstream
SNR Margin (dB):25.1 27.8
Attenuation (dB):21.0 8.4
Output Power (dBm):12.6 18.8
Attainable Rate (Kbps):22512 1124
Rate (Kbps):8189 509
MSGc (number of bytes in overhead channel message):65 16
B (number of bytes in Mux Data Frame):46 47
M (number of Mux Data Frames in FEC Data Frame):1 4
T (Mux Data Frames over sync bytes):5 1
R (number of check bytes in FEC Data Frame):16 16
S (ratio of FEC over PMD Data Frame length):0.1829 11.8014
L (number of bits in PMD Data Frame):2756 141
D (interleaver depth):256 2
Delay (msec):11 5


Adsl2+(开启AnnexM)支持：

Mode:ADSL2+ AnnexM EU-64
Type:Fast
Line Coding:Trellis On
Status:No Defect
Link Power State:L0

DownstreamUpstream
SNR Margin (dB):23.4 35.9
Attenuation (dB):22.5 9.0
Output Power (dBm):11.6 18.8
Attainable Rate (Kbps):21092 2092
Rate (Kbps):8189 509
K (number of bytes in DMT frame):47 48
R (number of check bytes in RS code word):16 16
S (RS code word size in DMT frame):1 4
D (interleaver depth):0 2
Delay (msec):0 2



如题，由于偶也不是搞这行的````所以看来看去看得晕晕忽忽。
请高手指点一下，另外能帮助分析一下最好，如果懒得分析的话请直接告诉我一个结果吧！

在这里先行谢过了！

YES东 发表于 2010-6-17 18:17:24

G.DMT

SnowGround 发表于 2010-6-17 19:35:39

谢谢东哥， 能简要说一下为什么不```

因为我看到ADSL2+中的噪音裕度好像是最大的啊````为什么不用Adsl 2+呢？
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