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W90
User Manual
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Yealink W90 User Manual

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Table of Contents
1
Table of Contents
Table of Contents................................................................ 1
Introduction ....................................................................... 3
DECT Transmission Technology ........................................... 4
Cluster ....................................................................................................................... 4
DECT-based Sync ...................................................................................................... 5
LAN-based Sync......................................................................................................... 7
Mixed Sync ................................................................................................................ 8
DECT IP Multi-Cell Deployment ToolKit ............................... 10
Deployment Guidance ....................................................... 12
Number of Simultaneous Calls ................................................................................... 12
System Capacity....................................................................................................... 12
Limit Values .............................................................................................................. 14
Installation Height of the Base ................................................................................... 15
Estimation B ased on the Total Coverage Area............................................................. 15
Estimation B ased on the Total Number of Handsets .................................................... 17
Placement Strategies of B ase Stations ....................................................................... 17
Creating a Planning Drawing ..................................................................................... 18
Positioning the Base Stations in the Planning Drawing ................................................ 19
Taking Measurements ....................................................... 21
Yealink W90 DECT IP Multi-Cell System Deployment Guide
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Deployment in a Multi-Storey Building ............................... 27
Installing the W90DM/W90B ............................................... 28
Introduction
3
Introduction
This guide explains the necessary preparations for the installation of a DECT IP multi-cell system and
how to take measurements for the optimum positions of the base stations. It also provides some
technical and practical background information.
Key Tasks for Deployment
Deploy the Multi-Cell System
Install the base stations based on the measurement results.
Take Measurements
Take measurements, and record the results.
Estimate the Base’s Position
1. Create a planning drawing.
2. Position the base stations in the planning drawing.
Analyze Requirements
1. Confirm the requirements.
2. Collect environmental information.
DECT Transmission Technology
4
DECT Transmission Technology
DECT Transmission Glossary
LA (List Access)
All menus access by the handset that needs to interact with the base station.
WB (Wide Band)
One base station supports a maximum of four active handsets.
NB (Narrow Band)
One base station supports a maximum of eight active handsets.
Synchronization Technology
The base stations in a multi-cell DECT network must synchronize with each other. The synchronization
can ensure a seamless handover and roaming for the LA and calls in the multi-cell system.
Base stations can be synchronized "over the air", meaning that they are synchronized via DECT. If the
DECT connection between specific base stations seems to be not reliable enough, synchronization can
also take place via LAN. To carry out the synchronization you will need the plan of the clusters with the
synchronization level for each base station.
Cluster
A cluster comprises a number of base stations in the DECT IP multi-cell system that synchronize with
each other to enable handover, roaming and load balancing.
Handover: The DECT connection of a handset is passed to another base station during a call.
Roaming: A handset in the idle status is connected to the multi-cell system via a new base station.
Load Balancing: Because the current base station is overloaded with active DECT or media
connections, the DECT connection is set up with a neighboring base station having free resources for a
call.
Handover and load balancing take effects only when the base stations are synchronized with each other.
Yealink W90 DECT IP Multi-Cell System Deployment Guide
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Single Cluster Only
All base stations in the multi-cell system belong to a cluster, where they can synchronize with each
other.
Multip le Clusters
Base stations that are far apart in the multi-cell system can be grouped into different clusters, where the
synchronization is not required. So there is no handover between two clusters.
DECT-based Sync
To ensure the synchronization, you should plan the level 1 base station in the center as much as
possible, and place the next sync level's base stations around the center.
The following is an example of a synchronization scenario:
DECT Transmission Technology
6
Each base station is assigned to a corresponding sync level . Sync level 1 is the highest level, which is
the level of the sync master and appears only once in each cluster.
A base station always synchronizes itself with a base station that has a higher sync level. If it detects
several base stations with a higher sync level, it synchronizes itself with the base station that has the
strongest signal. If it does not detect any base station with a higher sync level, it cannot synchronize.
Detect the base station
with a higher sync level?
Base station X
Cannot synchronize.
Synchronize itself with
the base station that has
the strongest signal.
Y N
More than one
base station with a higher
sync level?
Synchronize directly.
Y N
The more synchronization levels, the greater the possibility of synchronization loss. So select the base
station that is in the center of your DECT network as the base station with sync level 1.
Yealink W90 DECT IP Multi-Cell System Deployment Guide
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Your synchronization hierarchy could also look like as the following:
LAN-based Sync
The base station with the higher sync level will act as LAN master, the base with the lower sync level is a
LAN slave. One base station must be explicitly defined as LAN master, and it must be on DECT sync
level 1.
The following is an example of a synchronization scenario:
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