User guide

Deploying a Remote AP Engineering Your RF Communications
152
pmp-0229 (Mar 2013)
Example Use Case for RF Obstructions
A remote AP can be used to provide last-mile access to a community where RF obstructions
prevent SMs from communicating with the higher-level AP in cluster. For example, you may be
able to use 900 MHz for the last mile between a remote AP and the outlying SMs where these
subscribers cannot form good links to a higher-level 2.4-GHz AP. In this case, the short range of
the 900-MHz remote AP is sufficient, and the ability of the 900-MHz wavelength to be effective
around foliage at short range solves the foliage penetration problem.
An example of this use case is shown in Figure 45.
Figure 45: Example 900-MHz remote AP behind 2.4-GHz SM
The 2.4 GHz modules provide a sustained aggregate throughput of up to 14 Mbps to the sector.
One of the SMs in the sector is wired to a 900-MHz remote AP, which provides NLoS sustained
aggregate throughput
4
of
4
NLoS ranges depend on environmental conditions. Your results may vary from these.
C A N O P Y
C A N O P Y
2.4 GHz SM
2.4 GHz SM
with
Remote 900 MHz AP
C A N O P Y
2.4 GHz AP
C A N O P Y
C A N O P Y
C A N O P Y
C A N O P Y
900 MHz SM
4 Mbps Maximum Throughput
NLoS
Range ~2 miles
14 Mbps Maximum Aggregate Throughput
LoS
Range 2.5 miles
7 Mbps Maximum Aggregate Throughput
LoS
Range 5 miles
C A N O P Y
C A N O P Y
C A N O P Y
900 MHz SM
2 Mbps Maximum Throughput
NLoS
Range ~4 miles
C A N O P Y
900 MHz SM
4 Mbps Maximum Throughput
LoS
Range 20 miles
C A N O P Y
900 MHz SM
2 Mbps Maximum Throughput
LoS
Range 40 miles
C A N O P Y C A N O P Y C A N O P Y C A N O P Y
C A N O P Y C A N O P Y
2.4 GHz SM
2.4 GHz SM
with
Remote 900 MHz AP
C A N O P Y C A N O P Y
2.4 GHz AP
C A N O P Y
C A N O P Y
C A N O P Y
C A N O P Y C A N O P Y
C A N O P Y C A N O P Y
C A N O P Y C A N O P Y
C A N O P Y C A N O P Y
900 MHz SM
4 Mbps Maximum Throughput
NLoS
Range ~2 miles
14 Mbps Maximum Aggregate Throughput
LoS
Range 2.5 miles
7 Mbps Maximum Aggregate Throughput
LoS
Range 5 miles
C A N O P Y C A N O P Y
C A N O P Y C A N O P Y
C A N O P Y C A N O P Y
900 MHz SM
2 Mbps Maximum Throughput
NLoS
Range ~4 miles
C A N O P Y C A N O P Y
900 MHz SM
4 Mbps Maximum Throughput
LoS
Range 20 miles
C A N O P Y C A N O P Y
900 MHz SM
2 Mbps Maximum Throughput
LoS
Range 40 miles