User's Manual Part 1
Release8PlanningGuide
Issue2,November2007 Draft5forRegulatoryReview 148
However, the BHSs can be collocated at the same site only if one is on a different
frequency band range from that of the other or one of the following conditions applies:
◦ They are vertically separated on a structure by at least 100 feet (30 m).
◦ They are vertically separated on a structure by less distance, but either
• an RF shield isolates them from each other.
• the uplink and downlink data parameters and control channels match (the
Downlink Data parameter is set to 50%).
The constraints for collocated modules in the same frequency band range are to avoid
self-interference that would occur between them. Specifically, unless the uplink and
downlink data percentages match, intervals exist when one is transmitting while the other
is receiving, such that the receiving module cannot receive the signal from the far end.
The interference is less a problem during low throughput periods and intolerable during
high. Typically, during low throughput periods, sufficient time exists for the far end to
retransmit packets lost because of interference from the collocated module.
12.8 DEPLOYINGAREMOTEAP
In cases where the subscriber population is widely distributed, or conditions such as
geography restrict network deployment, you can add a Remote AP to
◦ provide high-throughput service to near LoS business subscribers.
◦ reach around obstructions or penetrate foliage with non-LoS throughput.
◦ reach new, especially widely distributed, residential subscribers with broadband
service.
◦ pass sync to an additional RF hop.
In the remote AP configuration, a Cyclone AP is collocated with a Canopy SM. The
remote AP distributes the signal over the last mile to SMs that are logically behind the
collocated SM. A remote AP deployment is illustrated in
Figure 36.
C A N O P Y
C A N O P Y
C A N O P Y
C A N O P Y
Canopy
SM
Canopy
SM with
Remote AP
Canopy
SM
C A N O P Y
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
Canopy
SM
C A N O P YC A N O P YC A N O P YC A N O P Y
C A N O P YC A N O P Y
C A N O P YC A N O P Y
C A N O P YC A N O P Y
Canopy
SM
Canopy
SM with
Remote AP
Canopy
SM
C A N O P YC A N O P Y
AP
C A N O P Y C A N O P Y C A N O P YC A N O P YC A N O P Y C A N O P YC A N O P Y C A N O P YC A N O P Y
C A N O P YC A N O P Y
Canopy
SM
Figure 36: Remote AP deployment