Belkin Vision Wireless Router N1 - Manual (Page 55)

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Using the Web-Based Advanced User Interface
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Using the Bandwidth Switch
This switch allows you to set the N1 Vision’s wireless bandwidth modes.
There are several modes available:
1) 20MHz only
Setting the N1 Vision to this mode allows only 20MHz operation.
This mode is compatible with N1, draft 802.11n-, 802.11g-, and
802.11b-compliant devices, but will limit N1, draft 802.11n-compliant
devices’ bandwidth by half. Reducing bandwidth to 20MHz-only
operation might solve some wireless problems.
2) 20MHz/40MHz Auto
Setting the N1 Vision to this mode allows it to switch automatically
between 20MHz and 40MHz operation. This mode enables 40MHz
operation, to maximize speed for N1, draft 802.11n-compliant
devices when conditions permit. When a legacy 802.11g
access point is presented and occupies an adjacent secondary
channel, the N1 Vision automatically reverts to 20MHz operation
to maximize compatibility. We recommend using this as the
default mode.