H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 501)

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4. Expand Advanced Setup.
Figure 521 Radio setup (advanced setup)
5. Configure the radio as described in Table 148 , and click Apply.
Table 148 Configuration items
Item Description
Preamble
Preamble is a pattern of bits at the beginning of a frame so that the receiver
can sync up and be ready for the real data.
• Short preamble—Short preamble improves network performance.
Therefore, this option is always selected.
• Long preamble—Long preamble ensures compatibility between access
point and some legacy client devices. Therefore, you can select this
option to make legacy client devices support short preamble.
802.11a/802.11n (5 GHz) does not support this configuration.
ANI
Adaptive Noise Immunity (ANI). After the ANI function is enabled, the
device automatically adjusts the noise immunity level according to the
surrounding signal environment to eliminate RF interference.
• Enable—Enable ANI.
• Disable—Disable ANI.