Avaya Communication Manager IP DECT, Installation, Administration And Maintenance Manual

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IP DECT base station Synchronisation
Issue 1 August 2006 17
As the DECT set user moves into the next IP DECT base station zone of coverage, the DECT
set detects that the IP DECT base station has a better signal strength. Again, the media stream
from the IP phone cannot move to the secondary IP DECT base station, so the primary IP
DECT base station uses the LAN to direct the voice to the new secondary IP DECT base
station.
IP DECT base station Synchronisation
To guarantee a seamless hand over if a caller moves from one IP DECT base station zone of
coverage to another IP DECT base station zone of coverage, an accurate synchronisation of
the IP DECT base stations is necessary.
The IP DECT base stations are synchronised over the air interface. During start-up, one IP
DECT base station will be the first, which transmits a signal on the air. The other IP DECT base
stations only receiving the signal until their are synchronous. If a IP DECT base station gets in
synch then it will transmit a signal on the air and will be the synch source for the next IP DECT
base stations. Only IP DECT base stations which can receive each other will be synchronised.
For the IP DECT base station to sync to another IP DECT base station the signal strength
cannot drop below –70 dBm. You must consider this requirement during the site survey.
Media Server
Media Gateway
Signalling
Base Station Control
I t f
RTP/RTCP
IP-Phone
ADMM
(IP DECT Base Station
in ADMM mode)
Primary Base
Station
New secondary Base
Station