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Security mode throughput

The 854B supports WEP 64/128 and only "Personal" (PSK) mode for WPA and WPA2. To better reflect "out of the box" performance, i.e. with default settings, that most users will experience, I ran these tests in 20 MHz ("Up to 130 Mbps") mode.

Figure 12 shows uplink throughput for unencrypted, WEP 128, WPA-PSK/TKIP and WPA2-PSK/AES modes.

Security mode throughput comparison - uplink
Click to enlarge image

Figure 13: Security mode throughput comparison - uplink

I had no problem connecting in any of these modes, and was disappointed to see a 33% throughput penalty using WPA2/AES, which provides the best secured performance. This is similar to the 30% throughput hit of the D-Link DIR-655 / DWA-652 combination.

Both WEP 128 and WPA/TKIP reduce throughput by around 50%. Unlike the D-Link DIR-655, the 834B doesn't switch to legacy 802.11b/g mode when WEP is used.

Security mode behavior in downlink is significantly different. Figure 13 shows only a 5% loss using WPA2/AES, which is very surprising considering uplink results. By comparison, WEP 128 and WPA/TKIP reduction are again similar, with about 55% throughput loss.

Security mode throughput comparison - downlink
Click to enlarge image

Figure 14: Security mode throughput comparison - downlink

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