Avaya CS 1000, Fundamentals

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Ensure that the DAPs are installed according to the location recommendations. For more
information, see
Deployment requirements on page 19.
Deployment requirements
This section describes SIP DECT deployment requirements.
Navigation
• Radio synchronization on page 19
• IP network configuration on page 23
• Location requirements on page 26
Radio synchronization
The radio network structure supports seamless handover of existing calls. This means that,
during a call, if a handset moves from the coverage area of one DAP into the coverage area
of another DAP, the new DAP can take over the call. The call is not interrupted, and the user
is not aware of the handover. In the traditional DECT system, synchronization between DAPs
occurs over the wired network. SIP DECT requires an accurate synchronization of the radio
signals in the air to support handover.
Important:
If a DAP cannot receive synchronization signals from at least one other DAP, it operates in
a single cell mode and cannot handover to other DAPs or receive handover from them.
Represent each DAP cell as a circle indicating the radio signals around the DAP. Figure 2:
DAP radio signal synchronization on page 20 shows two circles around the DAP.
• an inner circle in which sufficient radio signal strength exists for acceptable voice quality
• an outer circle in which sufficient signal strength exists for synchronization, but not enough
for acceptable voice quality
Components of SIP DECT systems
SIP DECT Fundamentals October 2012 19