Aastra X Series User manual

Aastra X series
NeXspan range
Installation and Implementation Manual
Cordless Telephony
AMT/PTD/TR/0020/2/7/EN
10/2008

AMT/PTD/TR/0020/2/7/EN 10/2008 Page 1-2
AASTRA
1 rue Arnold Schoenberg
78280 Guyancourt - France
Tel: [phone]
Fax: [phone]
www.aastra.com
Copyright © AASTRA

AMT/PTD/TR/0020/2/7/FR 10/2008 Page 1-4
CONTENT
Chapitre 1 - Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
1.1 ITEM ...........................................................................................................................12
1.2 AUDIENCE .................................................................................................................13
1.3 REFERENCE DOCUMENTS .....................................................................................13
1.4 ABBREVIATIONS ......................................................................................................15
1.5 DEFINITIONS .............................................................................................................16
1.5.1 Definitions concerning deployment......................................................................16
1.5.2 Overlapping radio areas ......................................................................................20
1.5.3 PARI/SARI management (mobile access rights).................................................22
1.5.4 .................................................................... Constructing the authentication key23
Chapitre 2 - Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.1 OVERVIEW ................................................................................................................24
2.2 DECT RADIO BASE STATIONS ................................................................................25
2.2.1 Physical description.............................................................................................25
2.2.2 Functional description..........................................................................................31
2.2.3 Characteristics.....................................................................................................33
2.2.4 Configuration of the old M6241 DECT base station ............................................34
2.2.5 Configuration of the new M6241 DECT base station...........................................35
2.3 MOBILE TERMINALS M90X ......................................................................................36
2.3.1 Physical description of mobile terminal M90x......................................................36
2.3.2 Configuring an M90x mobile terminal..................................................................37
2.4 MOBILE TERMINALS M910 / M915 ..........................................................................42
2.4.1 Physical description of a mobile terminal M910/M915.........................................42
2.4.2 Configuring a mobile terminal M910/M915..........................................................44
2.5 M92X MOBILE TERMINALS ......................................................................................46
2.5.1 Physical description of an M92x mobile...............................................................46
2.5.2 Configuring an M92x mobile terminal..................................................................49
2.6 FUNCTIONAL DESCRIPTION OF M90X, M910 AND M92X MOBILE TERMINALS 55
2.7 AASTRA MOBILE TERMINALS 142D .......................................................................57
2.7.1 Physical description of a mobile terminal A142d.................................................57
2.7.2 Overview of a mobile terminal A142d..................................................................58
CAPACITY 61
2.7.3 NeXspan C/S/L/D ................................................................................................61
2.7.4 NeXspan 50, NeXspan 500.................................................................................62
2.7.5 Aastra X series ....................................................................................................62

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Chapitre 3 - Deployment principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
3.1 OVERVIEW ................................................................................................................64
3.2 DETERMINING THE RADIO COVERAGE ................................................................65
3.2.1 Deployment tool...................................................................................................65
3.2.2 Base station positioning survey...........................................................................65
3.3 METHOD OF DETERMINING THE NUMBER OF BASE STATIONS ACCORDING TO
PREDICTED TRAFFIC 68
3.4 GROUPING RADIO AREAS INTO CELLS ................................................................71
3.5 INSTALLING AND CONNECTING THE BASE STATIONS .......................................72
3.5.1 Installing the base stations ..................................................................................72
3.5.2 Connecting base stations ....................................................................................72
Chapitre 4 - Hardware implementation on NeXspan C/S/L/D . . . . . . . . . . . . . . . . .74
4.1 CONVENTIONS USED FOR CARD NAMES ............................................................74
4.2 INTERFACE CARDS .................................................................................................74
4.3 (FACTORY) CONFIGURATION OF THE LD4 ST CARD WITH STOCKO FORMAT 76
4.3.1 Description of the connectors..............................................................................78
4.3.2 Description of the switches..................................................................................79
4.3.3 LD4 ST card layout..............................................................................................80
4.3.4 Connecting base stations ....................................................................................80
4.4 (FACTORY) CONFIGURATION OF THE LD4 RJ CARD WITH RJ45 FORMAT .....81
4.4.1 Description of RJ45 connectors...........................................................................81
4.4.2 Switch settings.....................................................................................................82
4.4.3 Installing the LD4 RJ card....................................................................................83
4.4.4 Connecting base stations ....................................................................................83
4.5 (FACTORY) CONFIGURATION OF THE LD4NX ST CARD WITH STOCKO FORMAT
85
4.5.1 Description of the connectors..............................................................................86
4.5.2 Switch settings.....................................................................................................87
4.5.3 Description of the diodes.....................................................................................88
4.5.4 LD4NX ST card layout.........................................................................................88
4.5.5 Connecting base stations ....................................................................................89
4.6 (FACTORY) CONFIGURATION OF THE LD4NX RJ CARD WITH RJ45 FORMAT 90
4.6.1 Description of the connectors..............................................................................91
4.6.2 Switch settings.....................................................................................................92
4.6.3 Description of the diodes.....................................................................................93
4.6.4 Description of push buttons.................................................................................93
4.6.5 Installing the LD4NX RJ card...............................................................................93
4.6.6 Connecting base stations ....................................................................................95

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4.7 CONFIGURING S/T ACCESSES OF UCT-S, UCTS-12 AND UCT-C CARDS .........96
4.7.1 S/T access of a UCT-S card................................................................................96
4.7.2 S/T access of a UCTS-12 card............................................................................96
4.7.3 S/T access of a UCT-C card................................................................................96
4.7.4 Description of S/T connectors of UCT-S, UCTS-12 and UCT-C cards................97
4.7.5 Configuring the remote power supply of S/T0 to S/T3 accesses.........................98
4.7.6 Connecting base stations ....................................................................................99
4.8 BASE STATION SYNCHRONISATION ...................................................................101
Chapitre 5 - Hardware implementation on Aastra X series . . . . . . . . . . . . . . . . . .104
5.1 INTERFACE CARDS ...............................................................................................104
Chapitre 6 - Implementation of hardware on NeXspan 50 . . . . . . . . . . . . . . . . . . .106
6.1 INTERFACE CARD ..................................................................................................106
6.2 CONFIGURING THE LDS CARD ............................................................................106
6.2.1 References and equipment................................................................................106
6.2.2 Front panel.........................................................................................................107
6.2.3 Equipment on top side.......................................................................................108
6.2.4 Equipment on bottom side................................................................................109
6.2.5 Switch settings...................................................................................................110
6.2.6 LDS card layout.................................................................................................111
6.2.7 Connecting the LDS card...................................................................................112
6.2.8 Distribution frame wiring with cable HG4302A ..................................................114
6.2.9 Distribution frame wiring with cable HG4302B ..................................................114
6.3 CONFIGURING THE LDT CARD .............................................................................115
6.3.1 References and equipment................................................................................115
6.3.2 Front panel.........................................................................................................116
6.3.3 Equipment on top side.......................................................................................117
6.3.4 Switch settings...................................................................................................118
6.3.5 LDT card layout .................................................................................................118
6.3.6 Connecting the LDT card...................................................................................119
6.3.7 Distribution frame wiring with cable HG4302A ..................................................121
6.3.8 Distribution frame wiring with cable HG4302B ..................................................121
6.4 SYNCHRONISATION ..............................................................................................122
6.4.1 For a NeXspan 50 equipped with an FPHBG2 back plane as well as CSI and LDT
boards................................................................................................................122
6.4.2 For a NeXspan 50 equipped with an FPHBG back plane as well as CSH and LDS/
LDT cards..........................................................................................................124
6.5 MEANS OF LDT/LDS CARD DIAGNOSIS ON NEXSPAN 50 .................................126

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6.5.1 Reading of the LDT card register content..........................................................126
6.5.2 Reading of the LDS card register content..........................................................127
Chapitre 7- Hardware implementation on NeXspan 500 . . . . . . . . . . . . . . . . . . . .130
7.1 INTERFACE CARD ..................................................................................................130
7.2 CONFIGURING THE LDT CARD .............................................................................130
7.2.1 References and equipment................................................................................130
7.2.2 Front panel of LDT card.....................................................................................131
7.2.3 Equipment on top side.......................................................................................132
7.2.4 Switch settings...................................................................................................133
7.2.5 installing the ldt board........................................................................................134
7.2.6 LDT card layout .................................................................................................134
7.2.7 ISDN clock interface..........................................................................................134
7.2.8 DECT clock interfaces.......................................................................................135
7.2.9 Connecting the LDT card...................................................................................135
7.2.10 Distribution frame wiring with cable AHG0013A................................................138
7.2.11 Distribution frame wiring with cable AHG0013B................................................138
7.2.12 Distribution frame wiring with cable HG4302A ..................................................139
7.2.13 Distribution frame wiring with cable HG4302B ..................................................139
7.2.14 Synchronisation.................................................................................................140
7.3 MEANS OF LDT/LDS CARD DIAGNOSIS ON NEXSPAN 500 ...............................143
7.3.1 Reading of the LDT card register content..........................................................143
7.3.2 Reading of the LDS card register content..........................................................144
Chapitre 8- Multi-site synchronisation (before R5.1) . . . . . . . . . . . . . . . . . . . . . . .146
8.1 PRINCIPLE ..............................................................................................................146
8.1.1 Contiguous multi-site configuration....................................................................146
8.1.2 Non-contiguous multi-site configuration.............................................................146
8.2 DISTRIBUTING DECT SYNCHRONISATION TO THE BASE STATIONS .............147
8.2.1 Distribution by M bit..........................................................................................147
8.2.2 Distribution by 3rd pair......................................................................................147
8.3 SYNCHRONISATION ON M6501 L/R/RM IP PBX AND SUCCESSION 6500 MEDIA GA-
TEWAY WITH OCT4/OCT4 I 151
8.3.1 Principle.............................................................................................................151
8.3.2 Wiring of synchronisation ports..........................................................................152
8.4 SYNCHRONISATION ON NEXSPAN S/L/D WITH UCT-S/UCT-L/UCT-D ..............153
8.4.1 Principle.............................................................................................................153
8.4.2 Wiring examples................................................................................................155
8.4.3 Wiring of synchronisation ports..........................................................................158

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8.5 SYNCHRONISATION ON NEXSPAN 50/500 WITH CSI .........................................159
8.5.1 Principle.............................................................................................................159
8.5.2 Configuration .....................................................................................................160
8.5.3 Wiring of synchronisation ports..........................................................................162
8.6 EXAMPLES ..............................................................................................................163
8.6.1 F1/F2 or F6/F2 contiguous multi-site configuration ...........................................163
8.6.2 F2/F2 or F4/F2 contiguous multi-site configuration ...........................................164
8.6.3 F1/F2/F4 or F6/F2/F4 contiguous multi-site configuration.................................165
8.6.4 F4/F4, F4/F6 or F4/F1 contiguous multi-site configuration................................166
8.6.5 F6/F1 or F6/F6 contiguous multi-site configuration in simplex mode ................169
8.6.6 F6-F6/F6 or F6-F6/F1 contiguous multi-site configuration in duplex mode.......170
Chapitre 9 - Checking the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
9.1 PRELIMINARY OPERATIONS ................................................................................172
9.2 PROCEDURE ..........................................................................................................172
9.2.1 Basic wiring checks ..........................................................................................173
Chapitre 10 - Programming for NeXspan C/S/L/D PBXs . . . . . . . . . . . . . . . . . . . .174
10.1 INTRODUCTION ......................................................................................................174
10.2 MANAGEMENT OF TOPOLOGY ............................................................................175
10.2.1 Declare the cells...............................................................................................175
10.2.2 DECT parameters.............................................................................................175
10.3 RESOURCES ...........................................................................................................177
10.3.1 Naming the trunk groups ..................................................................................177
10.3.2 Defining a trunk group ......................................................................................177
10.3.3 Selecting a trunk group.....................................................................................178
10.3.4 Associating the trunk group with the base station ............................................178
10.3.5 Checking the trunk group declaration...............................................................178
10.4 PUTTING DECT CARDS AND BASE STATIONS IN SERVICE ..............................179
10.4.1 Preliminary operations and checks...................................................................179
10.4.2 Deleting S0 subscribers....................................................................................179
10.4.3 Putting DECT interface cards in service............................................................179
10.5 DECLARING AND PUTTING IN SERVICE DECT BASE STATIONS .....................181
10.5.1 Declaring and defining a base station...............................................................181
10.6 CHECKING THE PROGRAMMING .........................................................................183
10.6.1 Display the base stations..................................................................................183
10.6.2 Displaying the coverage ...................................................................................183
10.7 REGISTRATION AND PUTTING IN SERVICE ........................................................184
10.7.1 Declaring a mobile in the PBX..........................................................................184

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10.7.2 Deleting mobiles from the PBX.........................................................................185
10.7.3 Display mobiles.................................................................................................185
Chapitre 11 - Programming for NeXspan 50 or NeXspan 500 PBXs . . . . . . . . . . .186
11.1 INTRODUCTION ......................................................................................................186
11.2 ROUTING CHECK ...................................................................................................189
11.3 DECLARE THE TELBOR SERVER .........................................................................190
11.4 DECLARE THE RADIO ZONES ..............................................................................191
11.5 DECLARE THE COMPANY/DEPARTMENT PROFILE ...........................................191
11.6 PUT THE CARDS IN SERVICE ...............................................................................192
11.7 DECLARE THE CELLS ............................................................................................193
11.8 DECLARE THE DECT PARAMETERS ....................................................................194
11.9 TRUNK GROUP/CELL ASSOCIATION ...................................................................195
11.10 DECLARE THE BASE STATIONS ..........................................................................196
11.11 REGISTER A MOBILE PASSWORD ......................................................................197
11.12 DECLARE AND REGISTER A MOBILE .................................................................197
11.13 DECLARE THE DECT SUBSCRIBERS ..................................................................197
Chapitre 12 - Programming for Aastra X series PBXs . . . . . . . . . . . . . . . . . . . . . .198
12.1 INTRODUCTION ......................................................................................................198
12.2 DECT MANAGEMENT MENU .................................................................................199
12.2.1 Declare the cells...............................................................................................199
12.2.2 DECT parameters.............................................................................................200
12.3 RESOURCES ...........................................................................................................202
12.3.1 Naming the trunk groups ..................................................................................202
12.3.2 Defining a trunk group ......................................................................................202
12.3.3 Allocating base stations...................................................................................203
12.3.4 Display the base stations...................................................................................205
12.3.5 Base station moving ..........................................................................................206
12.4 PUTTING DECT CARDS AND BASE STATIONS IN SERVICE ..............................207
12.5 REGISTRATION AND PUTTING IN SERVICE ........................................................207
12.5.1 Declaring a DECT terminal in Aastra X series..................................................207
12.5.2 Deleting mobiles from the PBX.........................................................................207
12.5.3 Deactivating the mobile registration authorisation.............................................208
Chapitre 13- Multi-site programming (before R5.1) . . . . . . . . . . . . . . . . . . . . . . . .210
13.1 PRECAUTIONS TO BE TAKEN IN A MULTISITE CONFIGURATION ....................210

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13.1.1 Contiguous multi-site configuration...................................................................210
13.1.2 Non-contiguous multi-site configuration............................................................211
13.2 DECLARING THE RADIO ZONES ON NEXSPAN 50/ NEXSPAN 500 ...................211
13.3 PROGRAMMING THE DECT PARAMETERS .........................................................212
13.4 MULTI-SITE CONFIGURATION WITH OCT4 .........................................................213
13.5 SPECIAL CASE OF A MULTI-SITE CONFIGURATION WITH UCT-S/UCT-L/UCT-D ..
214
13.5.1 Simplex mode....................................................................................................214
13.5.2 Duplex mode......................................................................................................216
13.6 MULTI-SITE CONFIGURATION WITH CSI .............................................................217

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AMT/PTD/TR/0020/2/7/EN 10/2008 Page 1-12
Chapter 1 - Introduction
1.1 Item
This document describes how to install and put in service the integrated DECT service for the
following PBXs:
NeXspan PBXs which correspond to iPBX earlier than R5.1
• NeXspan C/S/L/D
• NeXspan 50
• NeXspan 500
Aastra X series PBXs corresponding to iPBXs R5.1 and later
•AastraXD
•AastraXL
• Aastra XS, Aastra XS12 and Aastra XS6
This document is divided into 13 chapters:
Chapter 1: Introduction
This chapter gives the contents of the document, a list of the abbreviations used and the
definition of concepts specific to the DECT. Should you require more detailed information, a
"Reference Documents" section gives the references and titles of other manuals you can
consult.
Chapter 2: Description
This chapter describes the physical equipment making up the integrated DECT system (base
stations and mobiles).
Chapter 3: Deployment principles
This chapter describes the deployment method for a given installation, i.e. definition of the radio
coverage, the number of base stations and the dimensioning of the system.
Chapter 4: Implementation of hardware on NeXspan C/S/L/D
This chapter describes the interface cards to be used in a NeXspan C/S/L/D and the wiring
layout between the device and the DECT base stations.
Chapter 5: Implementation of hardware on Aastra X series
This chapter describes the interface cards to be used in AXD, AXL, AXS, AXS12 and AXS6
devices, and the wiring layout between the device and the DECT base stations.
Chapter 6: Implementation of hardware on NeXspan 50
This chapter describes the interface cards to be used in a NeXspan 50 and the wiring layout
between the NeXspan 50 and the DECT base stations.
Chapter 7: Implementation of hardware on NeXspan 500
This chapter describes the interface cards to be used in a NeXspan 500 and the wiring layout
between NeXspan 500 and the DECT base stations.

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Chapter 8: Multi-site synchronisation
This chapter describes the principles and specific features of synchronisation for multi-site
networks.
Chapter 9: Checking the installation
Describes the preliminary operations common to NeXspan C/S/L/D, NeXspan 50 and NeXspan
500 devices before programming and implementing the DECT installation.
Chapter 10: Programming for NeXspan C/S/L/D PBXs
This chapter describes the programming steps to put in service the integrated DECT service for
NeXspan C/S/L/D PBXs.
Chapter 11: Programming for NeXspan 50/NeXspan 500 PBXs
This chapter describes the programming steps to put in service the integrated DECT service for
NeXspan 50 and NeXspan 500 PBXs.
Chapter 12: Programming for Aastra X series PBXs
Describes the programming steps to implement the integrated DECT service for AXD, AXL, AXS,
AXS12 and AXS6 PBXs.
Chapter 13: Multi-site programming
This chapter describes the specific programming steps to put in service the integrated DECT
service for a multi-site network.
1.2 Audience
This document is for installers whose tasks are to:
• Carry out a study into positioning base stations, and system traffic flow
• connect base stations to the distribution frame,
• Start up the IP DECT system and put it into service.
1.3 Reference documents
Standards related documents
DECT standards (ETSI standards):
• ETS 300-175: Digital European Cordless Telephone Common Interface
• ETS 300-176: Digital European Cordless Telephone approval test specification
• ETS 300-444: Digital European Cordless Telephone General Access Profile
Electromagnetic compatibility:
System components comply with the following safety and electromagnetic compatibility
recommendations:
• ETS 300-329 : Radio Equipment Systems; Electromagnetic Compatibility for Digital
Enhanced Cordless Telephone.
• EN 60950 :Security of data processing equipment
• EN 50081-1 : Electromagnetic Compatibility - Transmission.

AMT/PTD/TR/0020/2/7/EN 10/2008 Page 1-14
• EN 50082-1 : Electromagnetic Compatibility - Immunity.
Documents about iPBXs earlier than R5.1
• NeXspan C/S/L/D Operating Manual - Volume 1 (AMT/PTD/PBX/0046*)
• NeXspan C/S/L/D Operating Manual - Volume 2 (AMT/PTD/PBX/0052*)
• NeXspan C/S/L/D Operating Manual - Volume 3 (AMT/PTD/PBX/0053*)
• Installation Manual for NeXspan 50 release R4.1 clusters, shelves, cards and terminators
(AMT/PTD/PBX/0027*).
• Installation manual for NeXspan 50 - Release R4.1 (AMT/PTD/PBX/0028*)
• Installation manual for NeXspan 500 release R4.2 clusters, shelves, cards and terminators
(AMT/PTD/PBX/0030*)
• Installation manual for NeXspan 500 - Release R4.2 (AMT/PTD/PBX/0031*)
• NeXspan NeXspan 50/NeXspan 500 Operating Manual - Volume 1 (AMT/PTD/PBX/0008*)
• NeXspan NeXspan 50/NeXspan 500 Operating Manual - Volume 2 (AMT/PTD/PBX/0009*)
• NeXspan NeXspan 50/NeXspan 500 Operating Manual - Volume 3 (AMT/PTD/PBX/0010*)
• NeXspan NeXspan 50/NeXspan 500 Operating Manual - Volume 4 (AMT/PTD/PBX/0011*)
• NeXspan NeXspan 50/NeXspan 500 Operating Manual - Volume 5 (AMT/PTD/PBX/0012*)
• Installation and Maintenance Manual - NeXspan C/S/L/D Range (AMT/PTD/PBX/0058*)
Documentation on iPBX release R5.1 and later
• Aastra Management Portal AXD – AXL – AXS – AXS12 – AXS6– Aastra 5000 Server
Operating Manual (AMT/PTD/PBX/0080)
• AXD - AXL - AXS - AXS12 - AXS6 - Aastra 5000 Server Installation and Maintenance Manual
(AMT/PTD/PBX/0058)
• A5000 Multi-site management (AMT/PTD/PBX/0081)
Terminals related documents
• M900 M901 M902 User Guide (PS8348*)
• M910/M915 User Guide (AMT/PUD/TR/0001*)
• M920 M921 M922 User’s Guide (PS10419*)
• A142d User guide

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1.4 Abbreviations
AC Authentication Code
ADPCM Adaptative Differential Pulse Code Modulation
ARI Access Right Identity
DCK DECT Ciphering Key
CRC Cyclic Redundancy Checking
DECT Digital Enhanced Cordless Telecommunications
EIC Equipment Installation Code
EMC Equipment Manufacturer Code
F1 PBX range including M6501 R/L IP PBX, M6501 RM IP PBX and
Succession 6500 Media Gateway
F2 M6540 IP PBX range
F4 PBX range including MC6530, MC6530E, MC6550, and M6550 IP PBX,
NeXspan 50 and NeXspan 500
F6 PBX range comprising NeXspan D (XD), NeXspan L (XL), NeXspan S (XS) and
NeXspan C (XC)
FPS Fixed Part Subnumber
GAP Generic Access Profile
IPEI International Portable Equipment Identity
IPUI International Portable User Identity
LAL Location Area Level
PLL Permanent Logical Link
PARI Primary ARI
PARK Portable Access Right Key
PARK{y} PARK with PLI y
PBX Private Branch eXchange
PLI Park Length Indicator
PSN Portable Serial Number
PUN Portable User Number
PUT Portable User Type
RFPI Radio Fixed Park Identity
RPN Radio Port Number
RSSI Radio Signal Strength indicator
SARI Secondary ARI
UAK User Authentication Key
UCT1 Central processing unit card - 1st generation
UCT2 Central processing unit card - 2nd generation

AMT/PTD/TR/0020/2/7/EN 10/2008 Page 1-16
1.5 Definitions
1.5.1 Definitions concerning deployment
• Coverage area:
The coverage area refers to the space within which the user of a mobile must be able to transmit
and receive calls. This area can include coverage both inside and outside a building.
• Base station
The base station is made up of an omnidirectional transceiver. The base station radio coverage
area (called a "radio area") is, in free space, spherical and centred on the base station. A base
station must belong to a trunk group (in the MMCs).
• Overlapping base stations:
Base stations with the same radio coverage (3 base stations maximum). Each base station
manages a certain number of mobiles, depending on their distribution.
• Examples:
case 1: B1, B2, and B3 are remote base stations located 30 to 50 cm from each other.
They constitute a single radio area. A mobile terminal detects the three base stations
with the same radio level. The configuration below shows three co-located base stations.
B1
B2
B3

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• case 2: ¨B1, B2, and B3 are base stations, each with its own radio area. Each time a
cordless handset is located at the intersection of these three areas, it recognises the
three base stations with the same radio level.
• Case 3: B1, B2, and B3 are remote base stations located 30 to 50 cm from each other.
They constitute a single radio area. B4 and B5, are base stations, each with its own radio
area. Each time a cordless handset is located at the intersection of these three areas, it
recognises the five base stations with the same radio level.
• Radio coverage:
The radio coverage of a site is the area where a cordless handset user must be able to transmit
and receive calls. Radio coverage can be indoors or outdoors, and on a horizontal or vertical
plane.
B1
B2 B3
B4 B5
B1
B
2
B3
Building A
Building B
Building C
Radio coverage

AMT/PTD/TR/0020/2/7/EN 10/2008 Page 1-18
• Radio area:
The radio area is the basic element in radio coverage. The radio area is the zone in which a base
station transmits and receives signals. However, depending on the traffic conditions (number of
simultaneous calls required within the same office), it may be necessary to install multiple base
stations adjacent to one another covering virtually the same radio area. In this case, they are
referred to as overlapping base stations. The size of each radio area varies according to the
topology.
The limits of a radio area correspond to the limits of the radio range of the base station in the
radio area. These limits are determined by the following two criteria:
1. Indicator of error rate in the transmission of the radio signal (CRC). The value of this indicator
must be 40H. If its value is lower, the limit of the radio area is reached.
2. The radio signal strength indicator (RSSI). If this level drops below 3DH while the CRC is still
at 40H, the limit of the radio area is reached.
Example:
• Radio area centre
Location of a base station or antenna serving a radio area.
• Radio range
The distance between the radio area centre and its perimeter. The radio range depends on the
environment.
• Trunk group (in the DECT sense):
A group of base stations (8 maximum). A trunk group must be associated with a cell. Note that
the notion of a DECT trunk group used here is different from that usually associated with a PBX.
• Cell:
The cell, to the PBX, represents a set of base stations. It constitutes the basic mobile roaming
entity. The PBX recognizes the cell in which a given mobile is located and not the radio area (that
is, the base station on which the mobile is locked). When the PBX sends a message to a mobile,
it broadcasts it to all base stations in the cell. Consequently, a cell generally represents a
homogeneous space.
One cell contains a maximum of 8 base stations. For an initial installation, the recommendation is
to limit the number of base stations to between 4 and 6 per cell, to allow for future expansion.
CRC < 40H
Base station
Movement of a mobile
RSSI < 3DH

Page 1-19 10/2008 AMT/PTD/TR/0020/2/7/EN
• Roaming:
mechanism for changing the channel for a cordless handset during communication or when no
call is set up (roaming).
• Handover:
mechanism for changing the base station during communication.
Figure 1-1: Example of deployment
++
+
++
+++
+ :DECT base
8-base station cell
radio area
centre of radio area
(3 overlapping base stations

AMT/PTD/TR/0020/2/7/EN 10/2008 Page 1-20
1.5.2 Overlapping radio areas
The radio coverage of a site is established by positioning basic radio areas next to each other.
However, to guarantee quality of service for the entire site, the radio areas must overlap on the
horizontal and vertical axes. This overlap is required so the roaming and handover phases take
place in good radio conditions.
During deployment you must measure the significant values (CRC/RSSI) of the radio area
studied and note them on the site plan. These measurements must be taken on the horizontal
and vertical axes. The six measurements must indicate the following three values: the CRC, the
RSSI, and the distance between the point where the measurement was taken and the base
station concerned.
Figure 1-2: Overlapping radio areas
Examples of representation of these measurements:
The graphs below show the change in the RSSI level according to the distance from the base
station studied. The graphs are linked to the chosen direction. To determine whether the overlap
of the two radio areas is correct, you must have the two measurements in both directions for the
plan concerned (for example on horizontal axle of base station 1, right direction – base station 2,
left direction). The graphs are shown side by side to be able to check that the intersection point
of the two curves is situated above the lower level (3DH) of the area limit. It is also necessary to
make sure that the CRCs of each curve are on each side of the intersection point.
These conditions allow you to ensure quality of service for roaming and handover.
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RSSI < 3DH
CRC <
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