Gigaset N870 IP PRO Installation, Configuration And Operation page 40

Gigaset N870 IP PRO / ALL UK en / A31008-XXXXX-XXXX-X-XX / settings_basestations.fm / 8/14/18
Base stations
DECT-based synchronisation
To relay DECT synchronisation signals from base station A to base station B, base station B must
be able to receive signals from base station A with sufficient signal quality.
A base station can synchronise with each base station on a higher sync level. The sync level con-
cept allows base stations to automatically select the best suitable base station (having a lower
sync level number) to receive synchronisation signal from. Simultaneously, it guarantees a
strictly limited number of hops along any branch in the synchronisation tree and to prevent cir-
cles between automatically optimised synchronisation chains.
During configuration, assign one level in the synchronisation hierarchy (sync level) to each base
station. Sync level 1 is the highest level; this is the level of the sync master and appears only once
in each cluster. A base station always synchronises itself with a base station that has a better sync
level. If it sees several base stations with a better sync level, it synchronises itself with the base
station that provides the best signal quality. If it does not see any base station with a higher sync
level, it cannot synchronise.
LAN-based synchronisation
If the DECT connection between base stations seems to be not reliable enough to permanently
guarantee a stable DECT over the air synchronization, e.g., because they are separated by iron
doors or a firewall, you can determine that synchronisation should take place via LAN. In this
case the base station with the higher sync level will act as LAN master, the base station with the
lower sync level is a LAN slave. One base station must be explicitly be defined as LAN master. Cur-
rently, it must be on DECT sync level 1.
Advantages of LAN synchronisation compared with DECT synchronisation:
•
Higher flexibility in the arrangement of the base stations as no synchronisation chains need
to be formed.
•
Fewer base stations required as the overlapping area of the base stations is smaller. The over-
lapping area for handset handover can be smaller, because neighboured base stations do
not need to receive each other in stable error free quality, but they must still be able to detect
each other for the process of dynamic channel selection.
•
Configuration of the system is simplified as all base stations can be synchronised on one syn-
chronization master.
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DECT manager and base stations must be connected to the same Ethernet or virtual
LAN sharing a common broadcast domain.