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Wireless Performance

NOTE!NOTES:
No Link Quality or Strength readings were available
Testing was done with a Linksys WPC54G card in AdHoc mode in a Dell Inspiron 4100 laptop running WinXP Home

Rather than lug around the WET connected to my laptop, I plugged one set to AdHoc mode into my LAN's switch and used a Linksys WPC54G card also set to AdHoc mode to do the testing. As both the table above and Chariot plot below show, performance was surprisingly poor.

Linksys WET54G: Four-location throughput test results

Figure 5: Four-location throughput test results
(click on the image for a full-sized view)

Note that his pattern is similar, but worse than, the results I obtained when I tested the Linksys WRT54G and WPC54G (Figure 6).

Linksys WRT54G - Four condition throughput test

Figure 6: Four Condition Throughput test - WRT54G and WPC54G
(click on the image for a full-sized view)

To test whether the WPC54G was the problem, I tried a few tests with a Belkin F5D7010 54g CardBus card and also tried forcing the Linksys card to 24, 11, and 5.5Mbps transmit rates while testing at my Condition 3 location. In each case, however, I obtained similar results, so I have to conclude that the WET's radio is the cause of the poor performance.

I also tried a few close-range (my test Condition 1) tests with 802.11b clients.

Linksys WET54G: Condition 1 throughput - NETGEAR WAB501 and Linksys WPC11v3

Figure 7: Condition 1 throughput - NETGEAR WAB501 and Linksys WPC11v3
(click on the image for a full-sized view)

Figure 7 shows that the Atheros-based NETGEAR WAB501 performed nicely, but that the Intersil-based Linksys WPC11v3 had some problems with maintaining a connection. I retried the Linksys card about three times, and each time experienced connection drops before my one-minute run had finished. The NETGEAR card, however, was solid as a rock, even during a 5 minute extended test.

I also did quick tests at my Condition 3 location for both cards and found they maintained the throughput you see above. I guess the WET54G's Intersil-based radio is a better performer for 11b CCK-based operation vs. 11g's OFDM.

802.11g Wireless Performance Test Results

Test Conditions


- WEP encryption: DISABLED
- Tx Rate: Automatic
- Power Save: Disabled
- Test Partner: Linksys WPC54G in AdHoc mode

Firmware/Driver Versions

AP f/w:
1.05 April 18,2003 WET54G
Wireless client driver:
WinXP 3.10.53.6 (WPC54G)
Wireless client f/w:
No Info

Test Description Signal Strength (%) Transfer Rate (Mbps) Response Time (msec) UDP stream
Throughput (kbps) Lost data (%)
Client to AP - Condition 1 0 21.1
[No WEP]
0
[w/ WEP]
1 (avg)
2 (max)
499 0
Client to AP - Condition 2 0 21.6 1 (avg)
2 (max)
335 7
Client to AP - Condition 3 0 0.25 0 (avg)
0 (max)
0 0
Client to AP - Condition 4 0 1.4 495 (avg)
4807 (max)
133 12
See details of how we test.

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