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Cisco Cisco Aironet 1522 Lightweight Outdoor Mesh Access Point Guía De Diseño

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Cisco Mesh Access Points, Design and Deployment Guide, Release 7.0
OL-21848-01
  Mesh Network Components
 shows one of the recommended installations of an outdoor AP1520.
Figure 13
Outdoor Pole-top Installation of a Mesh Access Point
Maximum Ratio Combining
AP1520 radios have a much higher transmit power, better receiver sensitivity, and broader outdoor 
temperature range as compared to AP1510 and AP1505 mesh access points.
•
The 5-GHz radio (802.11a) is a Single-in-Single-Out (SISO) architecture and the 2.4-GHz radio 
(802.11 b/g) is 1x3 Single-in-Multiple-Out (SIMO) architecture.
•
The 2.4-GHz radio has one transmitter and three receivers. Output power is configurable to 5 levels. 
With its 3 receivers enabling maximum-ratio combining (MRC), this radio has better sensitivity and 
range than a typical SISO 802.11b/g radio for OFDM rates.
When operating with data rates higher than 12 Mbps, you can increase gain on a 2.4-GHz radio to 2.7 
dB by adding two antennas and to 4.5 dB, by adding three antennas. For information about RX 
sensitivities and MRC gain, see 
1
2.4-GHz antenna (Tx/Rx)
3
Fiber-optic connection
2
5-GHz antenna (Tx/Rx)
4
4.9-GHz antenna (Tx/Rx)
1
Outdoor light control
3
6-AWG copper grounding wire
2
Streetlight power tap adapter
231524
1
2
3
Table 7
RX Sensitivities and MRC Gain 
Typical sensitivity (dBM)
MRC gain
Modulation 
Rate
One antenna 
Two antennas 
MRC 
Three antennas 
MRC 
Two antennas 
Three antennas
1
-92.0
-92.0
-92.0
0.0
0.0
2
-91.0
-91.0
-91.0
0.0
0.0
5.5
-90.3
-90.3
-90.3
0.0
0.0
11
-90.0
-90.0
-90.0
0.0
0.0