one or more voice calls occur on the DAP, one is one a dummy bearer, while the others are
voice calls.
Synchronization hierarchy
If two or more DAPs belong to the same system, the DAPs automatically synchronize using a
hierarchical structure. In most cases synchronization is automatic, but if your system has a
complex DAP
cell structure, you must manually configure synchronization.
The DAP controller tracks the synchronization structure and assigns each DAP a unique Radio
Part Number (RPN) after the DAP starts the first time. One or more DAPs act as a
synchronization source to form the root of the hierarchical structure, as illustrated in
Figure 3:
DAP synchronization hierarchy on page 21.
Figure 3: DAP synchronization hierarchy
If more than one synchronization source is present, each one forms a separate hierarchy of
DAPs called a synchronization island.
Automatic synchronization occurs within each synchronization island using the following
rules.
•
After a DAP starts, it searches for existing DAPs. If it finds one with a lower RPN, it
synchronizes with it. If no other DAP exists with a lower RPN, the new DAP becomes the
synchronization source.
Important:
Extra DAPs can be required to establish a synchronization path.
• If a DAP
detects more than one other DAP, it synchronizes with the DAP with the shortest
path to the synchronization master. If two or more DAPs have the same path length
Components of SIP DECT systems
SIP DECT Fundamentals October 2012 21
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