ALFA NETWORK AIP-W505 - Manual (Page 66)

C HAPTER 7 | Wireless Configuration
Basic Settings
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HT P HYSICAL M ODE
S ETTINGS
The HT Physical Mode section on the Wireless Settings Advanced page
includes additional parameters for 802.11n operation.
Figure 34: HT Physical Mode Settings
The following items are displayed in this section on this page:
◆ HT Channel Bandwidth — The 11n Router provides a channel
bandwidth of 40 MHz by default giving an 802.11g connection speed of
108 Mbps (sometimes referred to as Turbo Mode) and a 802.11n
connection speed of up to 150 Mbps. Setting the HT Channel Bandwidth
to 20 MHz slows connection speed for 802.11g and 802.11n to 54 Mbps
and 74 Mbps respectively and ensures backward compliance for slower
802.11b devices. (Default: 20MHz)
◆ Guard Interval — The guard interval between symbols helps receivers
overcome the effects of multipath delays. When you add a guard time,
the back portion of useful signal time is copied and appended to the
front. (Default: Auto)
◆ MCS — The Modulation and Coding Scheme (MCS) is a value that
determines the modulation, coding and number of spatial channels.
(Options: value [range] = 0~7 (1 Tx Stream), 8~15 (2 TxStream), 32
and auto (33). Default: auto)
◆ Reverse Direction Grant (RDG) — When Reverse Direction Grant is
enabled, the 11n Router can reduce the transmitted data packet
collision by using the reverse direction protocol. During TXOP
(Transmission Opportunity) period, the receiver could use remaining
transmission time to transmit data to a sender. The RDG improves
transmission performance and scalability in a wireless environment.
◆ Extension Channel — When 20/40MHz channel bandwidth has been
set, the extension channel option will be enabled. The extension
channel will allow you to get extra bandwidth. (Options: 2417MHz/
Channel 2, 2457MHz/Channel 10. Default: AutoSelect.)