AKlopper
03-12-2005, 10:23 PM
With a bit of network sniffing, I was able to figure out why my ActiveSync over Wifi wasn't working at home. I have 7 network interfaces on my Laptop, of which 4 were active at the time with file and print sharing enabled on them. The M5 had discovered all 4 IP addresses, and was trying each of them in turn with standard, slow TCP connect timeouts. Naturally the wifi card on my laptop was last on the list. It would have ActiveSync'ed eventually if I had waited long enough, though... Anyway, I disabled the MS network client and file and print sharing on 3 of the interfaces, and ActiveSync connected immediately.
Since I was accused of being a wifi beta tester in another thread, and since the question was asked of how wifi ActiveSync speeds compare to USB speeds, I put together the table below. Each test (except for the IR one, because I was getting bored by then) was performed multiple times to make sure the numbers were consistent. The wifi access point is on a different floor, which may have had an impact on the speed, but my laptop usually connects at 54Mbps so I assume that the Ambicom wifi SD card would be able to connect at 11Mbps (no easy way to tell, unfortunately).
For consistency, for all tests I copied a 5.3MB file into main memory on the M5 using the explore feature of ActiveSync.
File Size (bytes): 5434931
Transfer Time (s) Transfer Speed (bit/s) Relative Speed Max Interface Speed Efficiency
USB 16 2,717,466 100% 12,000,000 22.6%
Wifi 75 579,726 21% 11,000,000 5.3%
Bluetooth 130 334,457 12% 1,000,000 33.4%
Infrared 380 114,420 4% 115,000 99.5%
The moral of the story is, if you want to transfer anything big, use USB.
Since I was accused of being a wifi beta tester in another thread, and since the question was asked of how wifi ActiveSync speeds compare to USB speeds, I put together the table below. Each test (except for the IR one, because I was getting bored by then) was performed multiple times to make sure the numbers were consistent. The wifi access point is on a different floor, which may have had an impact on the speed, but my laptop usually connects at 54Mbps so I assume that the Ambicom wifi SD card would be able to connect at 11Mbps (no easy way to tell, unfortunately).
For consistency, for all tests I copied a 5.3MB file into main memory on the M5 using the explore feature of ActiveSync.
File Size (bytes): 5434931
Transfer Time (s) Transfer Speed (bit/s) Relative Speed Max Interface Speed Efficiency
USB 16 2,717,466 100% 12,000,000 22.6%
Wifi 75 579,726 21% 11,000,000 5.3%
Bluetooth 130 334,457 12% 1,000,000 33.4%
Infrared 380 114,420 4% 115,000 99.5%
The moral of the story is, if you want to transfer anything big, use USB.