Maximum Throughput - 5GHz - more
Figure 24 shows that when the Extreme is switched to its 20 MHz bandwidth mode, throughput drops to 72 Mbps, almost 20% less than the maximum 2.4 GHz band throughput.
Figure 24: Up and downlink throughput - 5 GHz band, 20 MHz bandwidth
Security mode throughput
I've found surprisingly high throughput reduction in draft 11n products and the Extreme was no exception. Since it is based on the Atheros XSPAN chipset, I expected very high throughput loss in WEP and WPA/TKIP modes and found almost 90% and 65% loss respectively in downlink tests (Figure 25). The 90% loss is a new high (or low, depending on your perspective) and pretty shocking.
Figure 25: Security mode throughput comparison - downlink
The good news is that WPA2/AES showed no significant throughput loss in downlink. This is the best performance I've seen yet and should be the expected performance, since encryption hardware is built into the wireless chipset.
For uplink, the percentages move around a bit, but the relative performance of the modes remains the same. Once again, the message is, for best secured performance, you must use WPA2/AES.
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