Cisco Cisco Aironet 350 Mini-PCI Wireless LAN Client Adapter Guia Do Desenho
9-5
Enterprise Mobility 4.1 Design Guide
OL-14435-01
Chapter 9 VoWLAN Design Recommendations
Channel Utilization
•
Stop packet transmission within 200 ms
•
Stop control transmissions within 10 seconds
•
Avoid transmission on the channel for 30 minutes
•
Scan the new channel for 60 seconds before transmission
Because of the radar requirements in the UNII-2, you should conduct a test for radar before going live
with voice applications, because the required radar avoidance behavior may impact voice call quality.
Cognio Spectrum Expert is also an excellent tool to test for the presence of radar. If radar is detected
during such a test, the APs can then be configured to not use those channels.
with voice applications, because the required radar avoidance behavior may impact voice call quality.
Cognio Spectrum Expert is also an excellent tool to test for the presence of radar. If radar is detected
during such a test, the APs can then be configured to not use those channels.
Channels in the 5 GHz Band
shows the FCC 802.11a channel assignments. The DFS requirement includes the four original
UNII-2 channels (52–64) and the new eight channels (100–116 and 132–140). The 5 GHz band now has
20 channels. These are non-overlapping channels, which means that they can all be co-located. 2.4 GHz
has only three non-overlapping channels. A design allowing co-located channels in a coverage area
aggregates the number calls obtainable in a coverage area.
20 channels. These are non-overlapping channels, which means that they can all be co-located. 2.4 GHz
has only three non-overlapping channels. A design allowing co-located channels in a coverage area
aggregates the number calls obtainable in a coverage area.
Figure 9-3
802.11a Channel Allocation
See the Cisco website for compliance information and also check with your local regulatory authority to
find out what is permitted within your country. The information provided in
find out what is permitted within your country. The information provided in
and
should be used as a general guideline. For up-to-date information on which Cisco products meet
regulatory requirements, see the following URL:
regulatory requirements, see the following URL:
The channel-based design based on channels may be implemented to a single floor, as shown in
. In a multi-floor design, the channels can be separated between floors to reduce the possibility
of co-channel interference.
220339
36
5180
5200
5220
5240
5260
5280
5300
5320
5745
5765
5785
5805
Channel
Identifier
Identifier
Center
Frequency
Frequency
Band
UNII-1
UNII-2
UNII-3
40
44
48
52
56
60
64
149
153 157
161
100
5500
5520
5540
5560
5580
5660
5680
5700
Channel
Identifier
Identifier
Center
Frequency
Frequency
Band
New UNII-2 Channels
104 108 112
116 132
136
140