User's Manual

SME VoIP System Guide, Version 1.5
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Chapter: SME System Deployment Scenarios
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3 SME System Deployment Scenarios
In principle, there is no one best solution for deployment of SME Telephony network. Different solutions
(i.e. deployments scenarios) exist depending on the customer requirements.
Before describing commonly used cases in SME System deployment, we first describe a multi-cell system
and its configuration.
3.1 Multi-cell System
A multi-cell system has a coordinated installation of intra-system synchronized base stations, which enables
seamless inter-cell handover for moving handsets.
It provides, besides the increased mobility, higher total capacity and higher quality than a corresponding
number of standalone base stations. This is due to a combination of the inter-cell synchronization and the
seamless handover features of a multi-cell system.
All handsets subscribed to a multi-cell system will benefit from high voice quality, full coverage and full
mobility over the whole multi-cell system coverage area.
3.2 Multi-cell Setup
A total of 40 Base stations can be hosted in a typical SME multi-cell system. At each time, a maximum of 6
levels can be formed in a multi-cell chain. Synchronisation Level is the air core interface between two base
stations.
Using the figure below, synchronisation level 1 is when Base unit 1 synchronizes to Master Base unit, and
Level 2 is when Base unit 2 uses Base unit 1 as its synchronization source, in that order.
The relevant synchronisation levels can be defined by specifying the hierarchy of bases in multi-cell
systems. The hierarchy of bases can be specified using the “DECT sync source” parameter in the SME VoIP
Configuration Server (Refer to Chapter 13 for detail procedure of Multi-cell setup).