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Gigaset N720 DECT IP Multicell Manual

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Projecting the DECT network
Gigaset N720 DECT IP Multicell System / engbt / A31008-M2316-L101-2-7619 / preparation.fm / 10.02.2012
Version 2, 06.08.2010
Synchronisation planning
Base stations that combine to form a DECT wireless network must synchronise with one
another to ensure a smooth transition of the handsets from cell to cell (handover). No
handover is possible between cells that are not synchronised.
They are synchronised via what is known as an air interface, i.e. via the DECT wireless net-
work. This means that the signal strength between neighbouring base stations must be
sufficient for synchronisation. The guide value is a minimum of –70 dBm, but this can also
be influenced by environmental conditions. For further information on this, please also
refer to the Defining limit values section
£ page 21.
The synchronisation takes place in a master/slave procedure. This means that one base
station (master) defines the synchronisation cycle for one or more other base stations
(slaves). Since it is generally the case that not all base stations have a good enough con-
nection to all other base stations in a multi-cell DECT network, it is not possible to have
only one master station and to configure all others as slaves. Instead, you have to set up a
synchronisation hierarchy. You can configure this hierarchy using the Web user interface
of the Gigaset N720 DM PRO DECT Manager.
During configuration, assign one level in the synchronisation hierarchy (sync level) to
each base station. Sync level 1 is the highest level; it 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 sta-
tion that has the strongest signal. If it does not see any base station with a higher sync
level, it cannot synchronise. A Gigaset N720 IP PRO base station shows its synchronisation
status with an LED.
For information on synchronising base stations, please refer to the user guide for the
Gigaset N720 IP PRO and Gigaset N720 DM PRO.
Please note
Synchronisation always refers to a cluster. You can set up several clusters that are not
synchronised with one another, so there is no possibility of a handover between clus-
ters.
Please note
We recommend giving the base stations a name during planning and entering the
name in the plan. The name should define the unique location in the building. It is also
helpful to document the assignment of the names to the MAC addresses of the
devices.
This makes the configuration of the synchronisation hierarchy in the Web user inter-
face and the assignment to the installed devices easier later on.
… 14 …


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