jmj10101 2008-11-7 17:40
33Km点对点(PtP)WiFi无线系统传输测试报告
[size=3][font=Times New Roman]33Km[/font][font=新細明體]点对点[/font][font=Times New Roman](PtP)WiFi[/font][font=新細明體]无线系统传输测试报告[/font][/size]
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[font=新細明體][size=3]测试目的[/size][/font]
[size=3][font=Times New Roman] [/font][font=新細明體]测试[/font][font=Times New Roman]33Km[/font][font=新細明體]远距离[/font][font=Times New Roman]WiFi[/font][font=新細明體]无线传输的真实流量与天线调整技术的精进练习。现场测试人员[/font][font=Times New Roman]:[/font][font=新細明體]阿树、阿南。远程调整测试人员[/font][font=Times New Roman]:jmj10101[/font][font=新細明體]。[/font][/size]
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[font=新細明體][size=3]测试地点与测试距离[/size][/font]
[size=3][font=新細明體]台湾苗栗县通霄镇[/font][font=Times New Roman] [/font][font=Wingdings][font=Wingdings]ß[/font][/font][font=Wingdings][font=Wingdings]à[/font][/font][font=Times New Roman] [/font][font=新細明體]台湾台中县台中港南端，总距离[/font][font=Times New Roman]33.29Km[/font][font=新細明體]。[/font][font=Times New Roman]
2008[/font][font=新細明體]年[/font][font=Times New Roman]11[/font][font=新細明體]月[/font][font=Times New Roman]4[/font][font=新細明體]日[/font][/size]
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[size=3][font=新細明體]测试环境[/font][font=Times New Roman] [/font][/size]
[size=3][font=Times New Roman] [/font][font=新細明體]台湾苗栗县通霄镇[/font][font=Times New Roman] [/font][font=新細明體]高度[/font][font=Times New Roman]: [/font][font=新細明體]约海拔[/font][font=Times New Roman]72[/font][font=新細明體]公尺[/font][/size]
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[size=3][font=新細明體]台湾台中县台中港南端[/font][font=Times New Roman] [/font][font=新細明體]高度[/font][font=Times New Roman]: [/font][font=新細明體]约海拔[/font][font=Times New Roman]61[/font][font=新細明體]公尺[/font][/size]
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[font=新細明體][size=3]测试硬设备[/size][/font]
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[font=新細明體][size=3]详细内容请参考附件档案[/size][/font]
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[font=新細明體][size=3]测试软件[/size][/font]
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[font=新細明體][size=3]测试系统无线设备规画[/size][/font]
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[size=3][font=Times New Roman]33Km[/font][font=新細明體]无线系统透过[/font][font=Times New Roman]Ixchariot[/font][font=新細明體]测试[/font][font=Times New Roman]Throughput[/font][font=新細明體]状况[/font][/size]
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[size=3][font=新細明體]测[/font][font=Times New Roman] [/font][font=新細明體]试[/font][font=Times New Roman] [/font][font=新細明體]总[/font][font=Times New Roman] [/font][font=新細明體]结[/font][/size]
[size=3][font=Times New Roman]1.[/font][font=新細明體]远距离天线调整虽然很困难，但仍属有效的改善传输质量与流量的重点。[/font][/size]
[size=3][font=Times New Roman]2. AP/AC[/font][font=新細明體]设备的[/font][font=Times New Roman]Max RF Distance[/font][font=新細明體]参数设定[/font][font=Times New Roman](ACK…)[/font][font=新細明體]，确实具有改善传输质量与流量的效果。[/font][/size]
[size=3][font=Times New Roman]3.[/font][font=新細明體]无线设备传送端与接收端的[/font][font=Times New Roman]Link Rate[/font][font=新細明體]需对等，单边无线讯号好及[/font][font=Times New Roman]Link Rate[/font][font=新細明體]好，并不能达到高流量传输的结果。[/font][/size]
[size=3][font=Times New Roman]4. Noise Level ([/font][font=新細明體]抗噪声、抗干扰能力[/font][font=Times New Roman])[/font][font=新細明體]对无线传输影响甚重。[/font][/size]
[size=3][font=Times New Roman]5. Signal Level ([/font][font=新細明體]接收讯号灵敏度[/font][font=Times New Roman]) [/font][font=新細明體]对无线传输影响明显。[/font][/size]
[size=3][font=Times New Roman]6.[/font][font=新細明體]在[/font][font=Times New Roman]Link Rate[/font][font=新細明體]无法维持在[/font][font=Times New Roman]54Mbps[/font][font=新細明體]的情况下，调降[/font][font=Times New Roman]Link Rate[/font][font=新細明體]到[/font][font=Times New Roman]36Mbps[/font][font=新細明體]，让[/font][font=Times New Roman]Noise Level[/font][font=新細明體]、[/font][font=Times New Roman]Signal Level…[/font][font=新細明體]等数值提高，有助传输质量与流量的提升。[/font][/size]
[size=3][font=Times New Roman]7.[/font][font=新細明體]此次测试结果证实，无线射频的功率大小的重要性，远低于无线讯号优化的重要性，既使[/font][font=Times New Roman]RF Output Power: 50mW[/font][font=新細明體]，仍能达到远距离高频宽传输。[/font][/size]
[size=3][font=Times New Roman]8.[/font][font=新細明體]从[/font][font=Times New Roman]Signal Level[/font][font=新細明體]与[/font][font=Times New Roman]Link Rate[/font][font=新細明體]及[/font][font=Times New Roman]Max RF Distance[/font][font=新細明體]等数据来看，[/font][font=Times New Roman]33Km[/font][font=新細明體]的[/font][font=Times New Roman]Throughput[/font][font=新細明體]应该还有成长空间，要超过[/font][font=Times New Roman]10Mbps[/font][font=新細明體]应该只是调整时间问题。[/font][/size]
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[size=3][font=新細明體]测试迅雷[/font][font=Times New Roman]Download[/font][font=新細明體]速度，透过[/font][font=Times New Roman]33Km Internet PtP[/font][font=新細明體]无线系统传输状况[/font][/size]
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[size=3][font=Times New Roman]33Km WiFi PtP Internet Throughput: 887.05KB/s[/font][/size]
[size=3][font=Times New Roman]Ps:Hinet MOD 5Mbps 33Km [/font][font=新細明體]外无线传输播放，测试并未成功，问题为何，尚待研究厘清。[/font][font=Times New Roman](33Km Ping Hinet Reply Time < 18ms)[/font][font=新細明體]。[/font][/size]
[size=3][font=Times New Roman]Ps: PC1-AP [/font][font=Wingdings][font=Wingdings]ß[/font][/font][font=Wingdings][font=Wingdings]à[/font][/font][font=Times New Roman] NB1-AC 33Km Ping Reply Time <12ms ; 33Km Ping Reply Time <6ms 99%[/font][font=新細明體]。[/font][/size]
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[size=3][font=Times New Roman]33Km WiFi PtP Internet Throughput: 914.11KB/s[/font][/size]
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2008-11-14 17:51
分享我們內部針對33km測試的討論結論
到底33km最大可以傳輸多少流量?
ACK Timeout計算遠距離傳輸最大流量
目前判斷:
1.AP-->AC, AC-->AP ; ACK time+Device time 約=1ms (已快到極限)
2.MAC訊框標準容量最大可達 1500Bytes
3.每秒傳輸流量 1sec=1000ms
1000ms*1500Bytes=1500000Bytes=1500KBytes=1.5MBytes=12Mbps
因此'33km最大流量約在12Mbps是極限
但因天線無法對準100%'加上環境因素'無線特性'設備極限...等因素考量下'
33km最大流量可能以12Mbps乘上70~80%
因此測試的9.1Mbps流量'已快接近實測極限值
