adsl 1M的线路测试,不知道这些参数怎麽样?
本帖最后由 zhjook 于 2013-3-15 16:03 编辑烽火hg110 刷dlink 2750B AU 3.0,下面自固件内自带的测试工具
ServiceVPI/VCIProtocolReceivedTransmitted
BytesPktsErrsDropsBytesPktsErrsDrops
pppoe_0_0_350/35PPPoE270300132500
XDSL
Synchronized Time:0 0:28:17
Number of Synchronizations:1
Mode:ADSL2
Traffic Type:ATM
Status:Up
Link Power State:L0
Copper Loop(kft):0.0
DownstreamUpstream
Line Coding(Trellis):OnOn
SNR Margin (0.1 dB):92254
Attenuation (0.1 dB):395231
Output Power (0.1 dBm):186123
Attainable Rate (Kbps):42121206
Path 0
DownstreamUpstream
Rate (Kbps):3874638
MSGc (# of bytes in overhead channel message):5913
B (# of bytes in Mux Data Frame):1209
M (# of Mux Data Frames in FEC Data Frame):216
T (Mux Data Frames over sync bytes):17
R (# of check bytes in FEC Data Frame):1216
S (ratio of FEC over PMD Data Frame length):1.98247.9101
L (# of bits in PMD Data Frame):1025178
D (interleaver depth):328
Delay (msec):15.8515.82
INP (DMT symbol):1.492.87
Super Frames:6260
Super Frame Errors:00
RS Words:20240
RS Correctable Errors:00
RS Uncorrectable Errors:00
HEC Errors:00
OCD Errors:00
LCD Errors:00
Total Cells:82692968
Data Cells:213
Bit Errors:00
Total ES:00
Total SES:00
Total UAS:00
宽带用户常常遇到各种各样的问题,不过因为因为宽带相关的问题来源可能非常多,所以在检查问题的时候或者再询问别人的时候可以去Modem的管理页面获得一些很有用的信息:
进入你的modem管理页面(192.168.0.1或者你设置的web 管理页面)
在status页面－>ADSL(D-link G640T为例)：
ADSL Status
ADSL status shows the ADSL physical layer status.
ADSL Firmware Version: 7.03.01.00 - 7.03.01.00 - 7.03.01.00 Annex A - 01.07.2c - 0.54
ADSL Software Version: V3.02B01T01.NZ.20071120
Line State Connected
Modulation ADSL_2plus
Annex Mode Annex A
Max Tx Power -38 dBm/Hz
Item Downstream Upstream Unit
SNR Margin 13 14 dB
Line Attenuation 24 10 dB
Data Rate 11135 944 kbps
ADSL Firmware Version- 目前modem的firmware型号
Line State- 目前的连接状态
Modulation- 宽带介入的种类,例子连接的ADSL种类是 ADSL 2+
SNR Margin-Signal to noise ratio
普遍来讲数值越大就代表错误越少
6bB. or below = Bad and will experience no line synchronisation or intermittent synchronisation problems.
7dB-10dB. = Fair but does not leave much room for variances in conditions.
11dB-20dB. = Good with little or no synchronisation problems
20dB-28dB. = Excellent
29dB. or above = Outstanding
Line Attenuation-
信号的丢失量,除了物理距离外还要加上线路本身的问题,越低越好
20bB. and below = Outstanding
20dB-30dB. = Excellent
30dB-40dB. = Very Good
40dB-50dB. = Good
50dB-60dB. = Poor and may experience connectivity issues
60dB. and above = Bad and will experience connectivity issues
Data Rate- 上传和下载的速度,单位是Kbps,上边的列子代表11.135Mb/s,上传是944Kb/s.
计算物理距离
由line Attenuation的数值可以计算出你家到你所连接的exchange/Cabinet的物理距离,请下载附件的Excel文件.
速度和Line attenuation的对比图:来源
ADSL2+的线路的物理距离和都应的SNR和Attenuation列表:
1.0km = 13.81dB = 23Mbit
1.5km = 20.7dB = 21Mbit
2.0km = 27.6dB = 18Mbit
2.5km = 34.5dB = 13Mbit
3.0km = 41.4dB = 8Mbit
3.5km = 48.3dB = 6Mbit
4.0km = 56dB = 4Mbit
4.5km = 62.1dB = 3Mbit
5.0km = 69dB = 2Mbit 下行衰减好大,39.5. 没办法线路长, 难怪联通说我们这里2M都不给装 Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 92 254
Attenuation (0.1 dB): 395 231
Output Power (0.1 dBm): 186 123
Attainable Rate (Kbps): 4212 1206
这几项最重要吧
页:
[1]