ALFA NETWORK AIP-W505 User Manual

Page 94

HAPTER

| WISP Mode Wireless Configuration

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BW (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.

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GI (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.

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STBC — Indicates if Space Time Block Coding (STBC) is being used.

STBC is a MIMO mechanism that allows a unit with only one antenna to

leverage multiple antennas on other 802.11n devices to improve

performance and range.

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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))

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SNR (0/1) — The signal-to-noise ratio value for the MIMO spatial

channels 0 and 1.