AASTRA SIP-DECT (Release 1.8)-Installation- and Administration Guide EN - Manual (Page 15)

Installation, Administration and Maintenance
Aastra depl-0900/0.4 Page: 15 (104)
2.5 RFP Synchronization
To guarantee a seamless handover if a caller moves from one RFP zone of
coverage to another RFP zone of coverage, an accurate synchronization of
the RFPs’ is necessary.
The RFPs’ are synchronized over the air interface. The first RFP to complete
start-up will transmit a signal on the air for the other RFPs’ to synchronize
from. If a RFP gets in sync then it will transmit a signal on the air and will be
the sync source for the next RFP. Only RFPs’ which can receive a
synchronization signal will become synchronized.
For the RFP to sync to another RFP the signal strength cannot drop below
–70 dBm. You must consider this requirement during the site survey.
As long as an RFP is not in sync, no calls can be established using this RFP.
If a RFP loses the synchronization the RFP does not accept new calls (“busy
bit”). There is a delay of maximum 3 minutes until the active calls on this RFP
are finished. Then it tries to get synchronized again.