Vingtor 2210020000, Deployment Manual, Page: 6 / 24

6
A100K10676
IP DECT Deployment on Ships
Server 6000 Multi-Cell System 3
Synchronization over Air 3.3.1
Base stations must be placed in such a way that overlap of radio
coverage between the base stations is established.
As a user moves from one base station radio coverage area to
another, the call must be handed over to the next base station. To
create handover between base stations, it is necessary to establish
synchronization chains. If synchronization between base stations is lost,
then handover is not possible and ongoing calls will be terminated.
Each base station must be placed within the radio coverage area of at least one
)
other base station.
Examples of Synchronization Chains 3.3.2
Certain rules must be taken into consideration when establishing
synchronization chains:
The distance over which synchronization can take place is limited ●
to a distance similar to a loss not exceeding 25 dB. If signal loss
exceeds 25 dB, it is not certain that synchronization will be stable.
For example, the signal measured next to the base station is 100 -
dB. The handset with test display active is moved away from the
base station until the reading in the display shows 75 dB. This is
the spot where the next base station should be installed.
It is recommended that a base station synchronizes with at least two ●
other base stations, and that a secondary sync way is defined to
ensure system redundancy. If the primary sync way is not working,
then the secondary sync way takes over and the synchronization
chain is not broken.
Synchronization chains for the Server 6000 Solution can be made
●
with base stations.
As the Server 6000 uses the DECT interface to synchronize on, one
base station is configured as the Sync Master. It is recommended to
place the Sync Master on the deck that is mid-way between the decks of
the vessel.
It is recommended to make a site plan. Every base station must be
numbered with Radio ID, Primary sync Radio ID, and Secondary sync
Radio ID.
Sync Chain With One Sync Master (Primary Sync 3.3.2.1
Ways)
Figure 2 Synchronization Chain