Table of Contents
Advertisement
Site planning and hardware deployment
Figure 2: DAP radio signal synchronization
Due to the cellular structure of a DECT radio network, overlap exists in the cells with sufficient
voice quality. The wider cell limit around the DAP therefore has some overlap with the other
cell and reaches to the radio of the other cell. Consequently, the DAPs of the overlapping cells
exchange radio signals. These radio signals are weak relative the signal needed by the
handsets, but are strong enough for synchronization.
Important:
For signal strength calculation see
If one DAP receives a signal from another, the receiving DAP checks the radio signals on
Primary Access Right Identity (PARI), to ensure that the signals belong to the same DECT
system. If the signals belong to the same DECT system, the DAPs synchronize according to
user-configured rules.
Important:
If two or more independent SIP DECT systems have overlapping coverage areas, configure
these systems so each has a unique subset or portion of carriers. When each system has
a unique subset of carriers, interference between the systems is reduced.
Reducing the number of available carriers reduces the maximum number of simultaneous
calls in the DECT system. To achieve your desired call capacity, you can be required to
install extra DAPs. For more information, see step 4 of
page 99.
The DAPs transmit with a minimum of two channels carrying primary voice and data, also
named bearers. If no voice calls occur over a DAP, the DAP transmits two dummy bearers. If
20
SIP DECT Fundamentals
Signal strength and frame errors
Comments? infodev@avaya.com
on page 22.
Configuring DECT Settings
on
October 2012
Advertisement
Table of Contents
