adsl 1M的线路测试,不知道这些参数怎麽样?

zhjook

烽火hg110 刷dlink 2750B AU 3.0,下面自固件内自带的测试工具

Service VPI/VCI Protocol Received Transmitted Bytes Pkts Errs Drops Bytes Pkts Errs Drops pppoe_0_0_35 0/35 PPPoE 270 3 0 0 132 5 0 0

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 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 Path 0 Downstream Upstream Rate (Kbps): 3874 638 MSGc (# of bytes in overhead channel message): 59 13 B (# of bytes in Mux Data Frame): 120 9 M (# of Mux Data Frames in FEC Data Frame): 2 16 T (Mux Data Frames over sync bytes): 1 7 R (# of check bytes in FEC Data Frame): 12 16 S (ratio of FEC over PMD Data Frame length): 1.9824 7.9101 L (# of bits in PMD Data Frame): 1025 178 D (interleaver depth): 32 8 Delay (msec): 15.85 15.82 INP (DMT symbol): 1.49 2.87 Super Frames: 62 60 Super Frame Errors: 0 0 RS Words: 2024 0 RS Correctable Errors: 0 0 RS Uncorrectable Errors: 0 0 HEC Errors: 0 0 OCD Errors: 0 0 LCD Errors: 0 0 Total Cells: 8269 2968 Data Cells: 2 13 Bit Errors: 0 0 Total ES: 0 0 Total SES: 0 0 Total UAS: 0 0

zhjook

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

松鼠派

下行衰减好大,39.5.

zhjook

没办法线路长, 难怪联通说我们这里2M都不给装

zhjook

        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