無線網路功率3mW測速結果

最近換了新的AP: ASUS RT-N18U

我直接把它刷成Tomato,並測試了最低功率能調到多低

2016-04-21 21:28:41 的螢幕擷圖

經過iPhone測速之後發現,其實只要3mW就夠普通家用環境使用

檔案_000

SpeedTest測速認證

另外還有OpenWRT以及DD-WRT都可以調到超低功率

補充1: dBm與mW轉換

補充2: TP-Link TL-WR841N刷OpenWRT

補充3: 建議Tomato、DD-WRT,若不行再用OpenWRT,因為OpenWRT可能沒有網頁介面

P.S.

802.11n
11channel 2.462Ghz
20Mhz Width

AP Isolation: On can prevent WiFi local virus spreading
Beacon: 128ms
Distance/ACK: 24meter for home usage prevent UFO hack
DTIM Interval: 64ms
Fragmentation Threshold: 2304ms
RTS Threshold: 2295ms
Transmit Power: 3mW~5mW is enough for home usage
(Original Transmit Power Design is 42mW, Increase power when earth magnetic field in wrong direction. Must smaller than power design to avoid damage)

# 288*8=2304,288*255/256*8=2295
# This can load 288 solar energy in 256 phase/slice QAM
# 24meter is also related to solar wave packet!!
# 42mW in 2.4Ghz is also related to solar energy!! :D
# 64ms, 128ms is related to solar frequency, when earth have a noise, it is also good!!

# Sad: Earth is not stable after moon or its spare come here.

GEM of the Earth
LCM(208,144)=1872
GCD(208,144)=16
Fragmentation Threshold=1872
RTS Threshold=1872-16=1856

GEM of the Solar
LCM(208,128)=1664
GCD(208,128)=16
Fragmentation Threshold=1664
RTS Threshold=1664-16=1648

GEM of the Galaxy to Sun
LCM(4096,208)=53248
GCD(4096,208)=16

GEM of the Galaxy to Earth
LCM(4096,288)=36864
GCD(4096,288)=32

Combine:
208 = 2^4 * 13
288 = 2^5 * 3^2
256 = 2^8
-> ( 2^8 * 3^2 * 13 = 29952 ) / ( 2^4 = 16 ) = 1876
Fragmentation Threshold=1876-sqrt(144)=1864
Fragmentation Threshold=1876
RTS Threshold=1876-19-13-11=1833
RTS Threshold=1876-13-11=1851
RTS Threshold=1876-11=1865
Orbit: Earth11, Venus13, Mercury19

Maximum Clients=128 *Maximum Concurrent Communication Object On The Track

 

[DD-WRT] saned

mount USB to /opt

Install ipkg-opt http://www.dd-wrt.com/wiki/index.php/Optware

# wget http://www.3iii.dk/linux/optware/optware-install-ddwrt.sh

# chmod 755 optware-install-ddwrt.sh

# ./optware-install-ddwrt.sh

ipkg-opt works now!!

Install library, xinetd and saned

# ipkg-opt install libtiff libjpeg libieee1284 xinetd sane-backends

# vi /opt/etc/xinetd.d/saned

service saned 
 { 
 type = UNLISTED 
 port = 6566 
 socket_type = stream 
 server = /opt/sbin/saned 
 protocol = tcp 
 user = root 
 group = root 
 wait = no 
 disable = no 
 }

fix xinetd startup issue

# vi /opt/etc/init.d/S10xinetd

unset library path before run:

unset LD_LIBRARY_PATH

fix saned startup issue

# mkdir /opt/mnt

# cp -a /etc /opt/mnt

# vi /opt/etc/init.d/S01sane-backends

mount rw etc before run:

mount /opt/mnt/etc /etc

fix libusb issue by replace libusb to /opt/lib

http://cargon.net/linux/ddwrt/libusb-0.1.so.4.4.4

http://www.dd-wrt.com/phpBB2/viewtopic.php?t=37104&sid=a8f3e7b641abdf47b28d918ceb1f125a

http://www.right.com.cn/forum/thread-45255-1-1.html