CHAPTER 7 Wireless Configuration
Basic Settings
HT PHYSICAL MODE SETTINGS
The HT Physical Mode section on the Wireless Settings Advanced page includes additional parameters for 802.11n operation.
Figure 39: HT Physical Mode Settings
The following items are displayed in this section on this page:
◆HT Channel Bandwidth — The Mini 3G Broadband 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 Mini 3G Broadband 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. (Default: Enabled)
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