TD 92579EN
15 February 2012 / Ver. H
Installation and Operation Manual
IP-DECT Base Station & IP-DECT Gateway (software version 5.0.x)
101
Mixed System
All IPBLs are synchronization masters in region 0. Any IPBS in this region will receive its
synchronization over the air from the RFPs, which are connected to the IPBL.
Sync Regions
Sync regions are used when, for example, several buildings are located in the same
coverage area and all radios are using same PARI Master but where the synchronization
coverage between buildings is not good enough for a stable synchronization.
A solution may be to use separate synchronization regions for the buildings and have
reference synchronization between the regions. Each region has its own Sync Master but
can take reference sync from another region and handover between the buildings is
possible. If a region should lose the reference synchronization with another region, the
internal synchronization in respective region will still work but there can be no handover
between the regions.
Note:
For the synchronization to work, it is not allowed to configure reference sync in a
ring.
Configure Sync Slave IPBS
All IPBSs in sync slave mode sends its list of sync candidates to the PARI Master. The PARI
Masters informs the IPBS sync slave which sync candidate it shall synchronize to.
In addition to the above automatic synchronization procedure it is also possible to use
static synchronization, that is, manually lock on to a specific RFPI. When specifying a
specific RFPI, it must be within the same synchronization region.
Configure Sync Slave as follows:
1
Select DECT > Air Sync.
2
Select "Slave" in the
Sync Mode
drop-down list.
3
To lock the sync slave to a specific RFPI, enter the sync RFPI in the
Sync RFPI
text
field. Enter an alternative sync RFPI in the
Alternative Sync RFPI
text field (optional).
4
Enter a region ID between 0 and 63 in the
Sync Region
text field.
5
Click "OK".
Configure Sync Master IPBS
Radios configured as sync master will report to the PARI Master that it wants to be a sync
master. The PARI Master will select one of them to be the active sync master.
When a sync master has been assigned to be active it searches for other IPBSs within the
same region during 30 seconds. If any IPBS is found the values for slot, frame, multi frame
and PSCN are received and applied to the Sync Master. After receiving all these values or
after the time-out of 30 seconds the Sync Master enters the master state.
With this method it will be possible to restart only the Master in the region. The remaining
slaves will be able to maintain synchronization for a few minutes during restart of the
Master. The Master will adjust itself to the other IPBSs at startup. The slaves will notice that
the Master is back and the synchronization will be received from the Master.
In master state the values are updated locally during all further operation of the Master
IPBS and no synchronization to other IPBSs in the same region is done.
