D-Link DIR-605L User Manual page 42

Section 3 - Configuration
Band Width: Select the Band Width:
Auto.20/40 - Select if you are using both 802.11n and non-802.11n wireless devices.
20MHz - Select if you are not using any 802.11n wireless clients. This is the default setting.
STBC: Check to enable Space Time Block Coding (STBC). This will increase your wireless coverage.
20/40MHz Coexist: Check to allow 20MHz and 40MHz to coexist.
Short Guard Interval: Check this box to reduce the guard interval time therefore increasing the data capacity. However, it's less reliable and may
create higher data loss.
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