H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 517)

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3. Configure channel calibration as described in Table 158 , and click Apply.
Table 158 Configuration items
Item Description
Basic Setup
802.11g
Protection
Mode
• RTS/CTS—Use RTS/CTS mode to implement 802.11g protection.
Before sending data to a client, an AP sends an RTS packet to the
client, ensuring that all the devices within the coverage of the AP do
not send data in the specified time after receiving the RTS packet.
Upon receiving the RTS packet, the client will send a CTS packet
again, ensuring that all the devices within the coverage of the client
do not send data in the specified time.
• CTS-to-Self—Use CTS-to-Self mode to implement 802.11g protection.
When an AP sends packets to a client, it uses its IP address to send
a CTS packet to inform the client that it will send a packet, ensuring
that all the devices within the coverage of the AP do not send data in
the specified time.
802.11g
Protection
• 802.11b devices and 802.11g devices use different modulation
modes, so 802.11g protection needs to be enabled for a 802.11g
device to send RTS/CTS or CTS-to-self packets to 802.11b devices,
which will defer access to the medium.
• Enable—Enable 802.11g protection.
• Close—Disable 802.11g protection.
An AP running 802.11g uses the 802.11g protection function in the
following two cases:
• An 802.11b client is associated with it.
• It detects APs or clients running 802.11b on the same channel.
IMPORTANT:
• Enabling 802.11g protection reduces network performance.
• Enabling 802.11g protection applies to the second case only,
because 802.11g protection is always enabled for the first case.
802.11n
Protection
Mode
Both RTS/CTS and CTS-to-Self modes can be adopted. The
implementation of the two modes is the same as 802.11g.
802.11n
Protection
• Enable—Enable 802.11n protection. When non 802.11n wireless
devices or non 802.11n clients exist within the coverage of the AP,
you need to enable 802.11n protection.
• Close—Disable 802.11n protection.
Calibration
Interval Channel and power calibration interval. A calibration interval takes effect on both mesh
network channel calibration and channel and power calibration of wireless services.
Channel
Setup
Follow these guidelines when configuring channel adjustment:
• Before configuring channel adjustment, make sure the AC adopts the auto channel
adjustment mode (for more information, see " Configuring radio parameters .").
Otherwise, channel adjustment does not work.
• If you lock the channel first, and then enable channel adjustment (by selecting Dynamic
Channel Select), channel adjustment does not work because the channel is locked.
Before enabling channel adjustment, make sure the channel is not locked.
• If you enable channel adjustment and then lock the channel, the last selected channel
is locked.
For information about how to lock the channel, see " Locking the channel ."