H3C Technologies H3C WX6000 Series Access Controllers User Manual
Page 361
34-6
Figure 34-5 Radio setup (advanced setup)
shows the configuration items of radio setup.
Table 34-2 Configuration items of radio setup
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. There are two different kinds of preambles:
Short preamble. A short preamble improves network performance. Therefore,
this option is always selected.
Long preamble. A 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.
Only 802.11b/g supports this configuration.
Transmit Distance
Maximum coverage of a radio
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: Enables ANI.
Disable: Disables ANI.
Client Max Count
Maximum number of clients that can be associated with one radio
Fragment Threshold
Specifies the maximum length of frames that can be transmitted without
fragmentation. When the length of a frame exceeds the specified fragment
threshold value, it is fragmented.
In a wireless network where error rate is high, you can decrease the fragment
threshold by a rational value. In this way, when a fragment of a frame is not
received, only this fragment rather than the whole frame needs to be
retransmitted, and thus the throughput of the wireless network is improved.
In a wireless network where no collision occurs, you can increase the fragment
threshold by a rational value to decrease acknowledgement packets and thus
increase network throughput.
Beacon Interval
Interval for sending beacon frames. Beacon frames are transmitted at a regular
interval to allow mobile clients to join the network. Beacon frames are used for a
client to identify nearby APs or network control devices.