15
IP DECT 6000 System Installation & Configuration Guide
A100K10652
above those objects but still kept distant from the ceiling.
● In multi-story buildings, base stations/repeaters may 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; due to variations in local attenuation patterns, each
case must be verified.
●
If the building contains a central open space with windows to the
other areas, base stations/repeaters may be installed in this open
space to provide a good coverage for the rooms in the inner circle on
all floors (e.g. hotels).
● If a base station/repeater (wall) hangs vertically on a wall, the RF
coverage in front of it is twice as large as the coverage at the rear.
When a base station/repeater is installed on the outside of an outer
wall, the RF coverage behind it is strongly attenuated by the wall.
●
Base stations/repeaters should preferably not be installed near large
metallic objects.
●
Reinforced concrete structures have a high attenuation factor inside
a building. Consequently, a higher number of base stations/repeaters
have to be installed in the building as these structures decrease their
coverage range. Lighter types of construction require fewer base
stations since attenuation figures are considerably lower.
3.2 Deployment of a Server 6000 Multi-Cell System
3.2.1 Sync over Air
As a user moves from one base station radio coverage area to another,
the call must be handed over to the next radio unit. To create handover
between radio units, it is necessary to establish synchronization chains.
If the synchronization between radio units is lost, then handover is not
possible and ongoing calls will be terminated.
)
Each base station must be placed within the radio coverage area of at least one
other base station or repeater (radio units).
3.2.2
Examples of Synchronization Chains
Certain rules must be taken into consideration when establishing
synchronization chains:
●
The distance over which synchronization can take place is limited
to a distance similar to a loss not exceeding 25 dB. If signal loss
exceeds 25 dB, it is not certain that synchronization will be stable.
-
For example, the signal measured next to the base station is 100
dB. The handset with test display active is moved away from the
base station until the reading in the display shows 75 dB. This is
the spot where the next base station should be installed.
●
It is recommended that a base station synchronizes with at least two
other radio units, and that a secondary sync way is defined to ensure
system redundancy. If the primary sync way is not working, then the
secondary sync way takes over and the synchronization chain is not
broken.
●
Synchronization chains for the Server 6000 Solution can be made
with base stations and repeaters.
● As you can only configure a repeater to synchronize on one radio ID,
it is not possible to define secondary sync ways for repeaters.
