Horizontal And Vertical Overlap; High Density Traffic Coverage - Nortel 7430 Deployment Manual

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3.2 Horizontal and Vertical Overlap

Base Stations are omni-directional; meaning RF signal is propagated vertically and horizontally
from the Base Stations and Repeaters. Depending on building materials the Base Station
coverage area will typically extend to more than one floor of a structure. In the multi-zone
building installation below, the coverage areas overlap horizontally, allowing the handset to roam
the structure without interruption. The handsets will not necessarily switch over to the Base
Station from which the strongest signal is received/measured. The handset will stay connected to
a Base Station as long as the quality of the signal received from the actual Base station to which
it is connected is good enough.

3.3 High Density Traffic Coverage

Each Base Station supports up to four simultaneous conversations. In some applications more
channels are needed in a dense area. To support these installation requirements, up to 3 Base
Stations can be placed in the same general area to provide extra traffic capability.
Up to 3 base stations can be mounted next to each other. There is no minimum distance between
the 3 base stations. If a fourth Base Station is required in a high traffic area, it must be placed at
least 80 feet/25m away if a direct line of sight exists between the fourth Base Station and the
group of three to prevent interference. Alternatively the fourth base station must be moved away
from the group of 3 Base Stations equal to a signal loss of 15 – 20 dB.
Digital Mobility Deployment Guide