Posted: Fri May 06, 2016 16:46 Post subject: Should "Short GI" be disabled when using Mixed N/G
I was reading on weather to enable the Short GI feature in ddwrt, and found this article on a Dlink website:
2. Short Guard interval & Aggregation
In the screen shot above you will notice that Short Guard Interval and Aggregation are both disabled. If you would use mixed mode, always make sure these are disabled, as these features were designed to be used with 802.11n, and can cause issues with mixed mode. If you are using 802.11n only, you may wish to enable these features as they will generally result in increased throughput
In my ddwrt settings, Short GI was automatically enabled when I selected "N/G mixed" as the mode. Should I disable Short GI when using mixed N/G devices or does ddwrt manages this differently than a Dlink router firmware?
Short GI and NG-Mixed has always worked fine for me in configrations mentioned ---
WNDR3700v4 - AP / CB (repeater) / WDS (on 5GHz also)
WRT160NL - AP / WDS / CB (repeater)
WRT2100L - AP / WDS / CB (repeater)
ok, I will leave it on. However, I did turn it off to see what would happen, and the most notable thing on the Sys info page was that the RX rate dropped to 130Mbps from 150Mbps (I have all N adapters, one is a G). I don't know if there are other effects. I ran speedtest.net, but that didn't show much of a difference in ping or throughoutput compared to when I had SG-I turned on.