412
Figure 442 Network diagram for uplink interface monitoring (a radio interface acts as the uplink
interface)
Channel busy test
The channel busy test is a tool to test how busy a channel is. It tests channels currently supported by the
district code one by one, and provides a busy rate for each channel. This avoids the situation that some
channels are heavily loaded and some are idle.
During a channel busy test, the AP does not provide any WLAN services. All the connected clients are
disconnected and WLAN packets are discarded.
Band navigation
Band navigation enables APs to prefer accepting dual-band (2.4 GHz and 5 GHz) clients on their 5
GHz radio because the 2.4 GHz band is often congested, increasing overall network performance.
When band navigation is enabled, the AP directs clients to its 2.4 GHz or 5 GHz radio by following
these principles:
• For a 2.4 GHz client, the AP associates to the client after rejecting it several times.
• For a dual-band client, the AP directs the client to its 5 GHz radio.
• For a 5 GHz- client, the AP associates to the client on its 5 GHz radio.
The AP checks the RSSI of a dual-band client before directing the client to the 5 GHz radio. If the RSSI is
lower than the value, the AP does not direct the client to the 5 GHz band.
If the number of clients on the 5 GHz radio has reached the upper limit, and the gap between the number
of clients on the 5 GHz radio and that on the 2.4 GHz radio has reached the upper limit, the AP denies
the client's association to the 5 GHz radio, and allows new clients to associate to the 2.4 GHz radio. If
a client has been denied more than the maximum times on the 5 GHz radio, the AP considers that the
client is unable to associate to any other AP, and allows the 5 GHz radio to accept the client.
Configuring multicast optimization
WLAN selects the lowest transmit rate for multicast packets and provides no multicast retransmission
mechanism. Therefore, WLAN cannot meet the requirements of some multicast applications that are not
delay sensitive but data-integrity sensitive such as HD VoD. The multicast optimization feature can solve
these problems by enabling APs to convert multicasts packets to unicast packets, so WLAN can provide
retransmission service and higher transmit rates for the converted unicast packets.
Unless otherwise specified, the unicast packets in this chapter refer to the wireless unicast packets that
have the priority of video.
Wired Network
Uplink interface
Client
Client
L2 Switch
FAT AP
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