User's Manual

SME VoIP System Guide, Version 1.5
Proprietary and Confidential
Chapter: SME VoIP Network Planning/Optimization
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• Ensure that the installation area is free of caustic or corrosive liquids, substances, or materials. If
batteries will be installed as part of the system, ensure that adequate precautions are taken (such as
special ventilation) to prevent corrosive emissions from the batteries. Check local building codes for
additional requirements.
4.7 Recommended Base station/Repeater Placement
There is no one strategy for deploying base stations. These are some recommended Base station and/or
Repeater placement strategies:
Around Corridors:
Base stations/repeater should be deployed vertically preferably at corridor intersections where
propagation patterns follow the corridor patterns. The base station/repeater should point towards the
corridor and preferably in the middle height between the floor and the actual ceiling. In case there are high
objects in the area, the base station/repeater should be installed above those objects but still kept distant
from the ceiling.
Multi-Storey Buildings:
Base stations and repeaters can be installed on opposite sides of the floors to take advantage of the floor-
to-floor coverage. The coverage design cannot rely entirely on floor-to-floor propagation; each case must
be verified due to variations in local attenuation patterns.
Open Areas/ Large Halls:
Base stations and repeaters can be deployed in open areas for buildings that contain a central open space
area with windows to the other areas. This provides a good coverage for the rooms in the inner circle on all
floors (e.g. hotels).
In large halls, Base stations/repeater should be installed vertically in the middle of the space below the
drop ceiling.
Mounting Positions:
When Base stations and repeaters are mounted vertically on a wall, the radio coverage in front of these
devices is twice as large as the coverage at the rear.
Repeaters should be installed in the middle of corridors and small rooms.
Metallic Structures/Objects:
Base stations and repeaters should not be deployed near large metallic objects.
Reinforced Concrete Structures:
These structures have a high attenuation factor inside the building. They reduce the radio coverage range
of the Base stations and repeaters and therefore require a higher number of base stations or repeaters in
the building. Lighter types of construction materials require fewer base stations since attenuation figures
are considerably lower.
Others Recommendations:
• Maximum distance between two base stations varies depending on material and construction of
buildings, but there must always be synchronization chains and radio coverage overlap between the
two base stations or handover between radio units. The time it takes a person to cross the common
coverage area must be 10 seconds or more, as the handset needs time to scan for an alternative base
stations.
• Ensure that the installation area is located no closer than 6.1meters/20.0 feet from electric devices that
produce large electro-magnetic fields (EMF) or high levels of radio frequency energy. Possible EMF