Aastra Cordless Phone Installation Planning

Brand: Aastra

Model: Cordless Phone

Type: Installation Planning

INSTALLATION PLANNING

INSTALLATION PLANNIN G5/1531-ANF 901 14D320131128

Cordless Phone

M WenzelmwenzelTero Silvennoinen

CORDLESS PHONE

2 5/1531-ANF 901 14 Uen D3 2013-11-28

Disclaimer

No part of this material may be reproduced in any form without the

written permission of the copyright owner.

The contents of this document are subject to revision without notice due

to continued progress in methodology, design and manufacturing.

Aastra shall have no liability for any error or damage of any kind resulting

from the use of this document.

5/1531-ANF 901 14 Uen D3 2013-11-28 3

ENERAL

1 General

1.1 Scope

This installation planning document will give an explanation of how

different factors influence on the size of the MX-ONE cordless phone

system and how acceptable values can be given to these factors. The

factors that determine the final configuration of a system are:

• Number of base stations (Radio Fixed Parts (RFPs))

• Number of portables (Portable Parts (PPs))

• Traffic requirement for the system

• Physical nature of the site

• Choose how the media gateways are synchronized.

Furthermore the system has a number of restrictions that gives limita-

tions to the configuration. These items are explained in the following

sections.

To make a system configuration, first the limitation of the system must

be known, see chapter 2 Limitations in the system on page 6.

The traffic requirements for the system are determined by the number of

portables needed, the estimated traffic generated per portable and the

Grade Of Service (GOS) accepted by the customer. For more detailed

description, see chapter 4 Traffic capacity on page 31.

In this document ‘ELU31/3’ refers to ROF 137 5412/3 and ‘ELU31/4’

refers to ROF 137 5412/4. If not mentioned specifically, ‘ELU31’ refers

to the index /4 and /3 boards, all boards are assumed to have latest FW,

co operability is only guarantied between index /3 and /4 of latest FW.

ELU31/4 has an on-board switch. The switch can be set to “index_3

mode” or “index_4 mode”. This switch must be set to index_3 mode to

have the same functionality as ELU31/3. For PCM synchronization of the

media gateway feature the switch shall be set to index_4 mode. This

feature allows media gateways to receive synchronization from the

ELU31 board.

• ELU31/4 can replace all other ELU31 versions with some limita-

tions. See section 2.

• ELU31/4 index_3_mode and ELU31/3 can coexist on the same

ring.

• ELU31/4 index_4_mode can distribute PCM synchronization to all

media gateways with the DECT synchronization ring. See chapter

CORDLESS PHONE

4 5/1531-ANF 901 14 Uen D3 2013-11-28

Introduction to the synchronization ring in CORDLESS PHONE

Installation Instruction.

• System can use one external PSTN timing source, recommended,

or use a free running MGU/2 to synchronize the master ELU31

board, thus with ring in index4_mode synchronization all media

gateways.

• ELU31/4 index_4_mode can have ELU31/3 boards as bus slave.

• All boards on the ring must be of the same ‘type’, ELU31/4

index_4_mode or a combination of ELU31/4 index_3_mode and

ELU31/3.

1.2 System Overview

Below is an architectural overview over an MX-ONE cordless phone

system with integrated DECT.

5/1531-ANF 901 14 Uen D3 2013-11-28 5

ENERAL

Figure 1: Architecture of a MX-ONE cordless phone system

Pcm synchronization in the picture above is distributed in the synchroni-

zation ring. This puts some requirement on the configuration.

• All boards in the ring must be ELU31/4 with switch set to

index_4_mode.

• All boards in the ring must be configured to enable synchronization

distribution, see CXCFC in CORDLESS PHONE command

description.

• All media gateways shall be configured to retrieve synchronization

from ELU31, except the master board. With command

Base

Portables

Location

Area

Base Base

Fixed

Part

...

ASP 113 01

station

station station

Base

station

Media gateway

PSTN

Synchronization accuracy within +/- 5 PPM

NTU or CPE

+/- 25 PPM

Synchronization ring cable

CORDLESS PHONE

6 5/1531-ANF 901 14 Uen D3 2013-11-28

trsp_synchronization, all ring member boards shall be given same

class and priority. Ring master board shall have class ‘no’, prio ‘no’.

• All involved media gateway must be equipped with MGU boards.

2 Limitations in the system

2.1 Seamless Hand over

In order to secure cordless phone functionality, the MX-ONE system

must be synchronized to the reference timing source

Synchronization between all ELU31 boards in the system are handled by

a ring structure. The ring consists of two separate electrical interfaces for

synchronization. This to get the DECT air frame synchronization

correct.

The number of ELU31 boards connected to the ring are different for

different media gateway types.

• MX-ONE Classic (LBP22 with MGU) max 1 ring member

• MX-ONE Lite (LBP24 with MGU) max 1 ring member

For a more detailed description regarding synchronization and synchro-

nization ring cable, see installation instructions for CORDLESS PHONE.

Also, if one of the parties in a call is registered on an EMG Media

Gateway, seamless external hand over is not possible. (External hand

over is possible, but not seamless).

Note: Even if only one ELU31 board is used in the ring there has to be

ring cable looped between Tx and Rx on that ELU31 board.

2.2 ELU31 Boards

The practical limitation of the number of ELU31 boards in a system is

decided by the number of portables, how much traffic each portable

generates, the Grade of Service (GOS) that is accepted by the customer

and the power consumption.

When using MX-ONE Classic with MGU, the practical and power limita-

tion is 10 ELU31 boards.

When using MX-ONE Media Gateway Classic with LSU-E, the practical

and power limit is 5 ELU31 boards per (DSU-controlled) subracks, or 15

5/1531-ANF 901 14 Uen D3 2013-11-28 7

IMITATIONS IN THE SYSTEM

ELU31 boards in a 4 subracks gateway. In a 3U box BFD 761 42/x the

number of ELU31 boards is limited to 1 due to power consumption.

ELU31/1 is a phased-out product and is service stopped. It is not recom-

mended to use ELU31/1

ELU31/2 is a phased-out product and is service stopped. It is not recom-

mended to use ELU31/2

ELU31/3 must have latest FW to inter work with ELU31/4 board.

ELU31/3 can be bus slave to a ring with ELU31/4 index_4_mode.

ELU31/4, and ELU31/3 has improved ring communication and ACDM

function. Therefore it is recommended to use these boards in the ring.

ELU31/4 index_3_mode, can be ring board or bus slave together with all

index.

ELU31/4 index_4_mode, can only operate with other index_4_mode

boards in the ring. It can be bus slave, but not recommended, in other

configurations.

2.3 Base stations

Only the following MX-ONE base stations are compatible with the

ELU31 board:

• Base station defined in document “Installation Guide Base Station”.

• BS330 (NTM/KRCNB 301 03/1, NTM/KRCNB 301 02/1,

NTM/KRCNB 301 04/1).

• BS340 (NTM/KRCNB 302 01/1).

• BS370(NTM/KRCNB 303 01/1). Not for new delivery.

The maximum number of base stations connected to one ELU31 board

is 8.

Due to the fact that the BS370 is a base station without cable connection

to the system there is no limitations to the number of BS370 base

stations connected through a radio link to a designated base station,

BS330 or BS340.

Note however that there is a limit of 8 simultaneous calls handled by the

system, for more information see chapter 4.1.1 BS370, not for new

delivery. on page 31

For configuration and upgrading of the Base station BS370, see installa-

tion instructions for CORDLESS PHONE.

CORE base station is service stopped, not recommended to use.

CORDLESS PHONE

8 5/1531-ANF 901 14 Uen D3 2013-11-28

2.4 Portables

The maximum number of portables that can be located/present in one

LIM is limited by the software to 1000.

Note: These numbers represent the maximum possible number of

portables. The number of portables that should be initiated or

located depends on the amount of traffic generated by each

portable, but the practical number of initiated or located portables

may be lower. Note also that roaming traffic is generated when

the portable is moved, even if no calls are made.

2.5 Cabling

The maximum cable length between an ELU31 board and a base station

is 1700 metres, this cable length is valid for BS330 and BS340 and 0.6

mm cable with 1 EPP. For more details about requirements on the cable

see installation instruction CORDLESS PHONE. For other cable dimen-

sions and other base station, see installation instructions for CORD-

LESS PHONE.

The maximum cable length for the synchronization ring using a cable

with wire diameter 0.6 mm is 1300 metres per segment, for more details

about requirements on the cable see installation instruction CORDLESS

PHONE.

All cables, both between the ELU31 boards and base stations as well as

for the synchronization ring, must be twisted pair cables. In areas with

high electric disturbances, shielded twisted pair cables are required. For

new installations, it is always recommended that shielded twisted pair

cables are used.

There is no theoretical limit to the number of ring segments per system.

However it is recommended that if the total cable length for one sync ring

is more than 3 km or if the sum of cable delays for one sync ring is more

than 20 microseconds a careful verification of the sync stability is

strongly recommended using the diagnostic_print commands for CTLP.

For a more detailed description see installation instructions for CORD-

LESS PHONE.

2.5.1 Power supply for BS370

The BS370 is powered by a local AC adapter and the maximum distance

between a power outlet and the BS370 is 10 metres.

5/1531-ANF 901 14 Uen D3 2013-11-28 9

IMITATIONS IN THE SYSTEM

2.6 An MX-ONE with remote GWs

Figure 2: Example of an MX-ONE exchange with a main site and

remote sites which, from the synchronization point of view,

are independent from each other. Synchronization between

the gateways within each site is distributed by

synchronization ring. Each site is synchronized by a free

running MGU index 2. This must be used when a customer

site only has SIP routes.

Note: When moving between the different sites, the PP will lose connec-

tion and drop any ongoing calls. Power off and power on the PP

is recommended to avoid ‘No System’ in the display.

If a PP is not powered off before leaving a site the portable will loose

contact with the system (the display will show No system). Once the

portable has reached a coverage area again (remote site) the portable

will regain contact with the system, and a location registration will be

made.

Media gateway1

ELU31

Media gateway 2

ELU31

MGU/2

Media gateway 3

ELU31

Media gateway 4

ELU31

Main site

Coverage

area

Synchronization ring cable

Media gateway 5

ELU31

Media gateway 6

ELU31

Remote site

Coverage

area

Synchronization ring cable

Media gateway 7

ELU31

Remote site

Coverage

area

Synchronization

ring cable

Router

Lan

network

Lan

network

Lan

network

MGU/2

CORDLESS PHONE

10 5/1531-ANF 901 14 Uen D3 2013-11-28

3 Base station planning

3.1 General

A major task when planning a cordless phone system is to define the

number of base stations required to cover an area to a satisfactory level.

This section describes how base station planning can be made in order

to gain full area coverage. The section Traffic capacity explains how

traffic requirements additionally influence the number of base stations.

Another aspect of the base station configuration is the power supply

which is explained in detail in the installation instructions for CORDLESS

PHONE.

3.2 Coverage areas

3.2.1 The radio cell

The area covered by a base station is not of a spherical shape as often

suggested in pictures. If a snapshot could be taken of its form, it would

become clear that its shape is much more irregular. The momentary size

and shape are dependent on the material of which walls and floor are

made, the position and material of furniture, machines, air-conditioning

and the position of the base station in such an environment. Because of

these unpredictable conditions it is not possible to give any hard rules on

calculating the number of base stations in a given situation.

It is not to say that base station planning is very difficult, on the contrary,

but size, architecture and structure of buildings and their influence on the

field pattern cannot be foreseen. The quickest and simplest way is there-

fore measuring. During a so-called site survey, an average cell size can

be determined, with help of a site survey tool, see chapter 3.9.1 Site

survey tool on page 22. This forms the basis of a base station plan.

The guidelines listed below will help getting a better understanding of the

local situation when base stations are being planned. See chapter 3.9

Site survey on page 21 how a site survey can be done.

3.2.2 Location area

A location area is the domain in which a portable may receive and/or

make calls as a result of a single location registration. In the MX-ONE

cordless phone system it is the area covered by one or more base

5/1531-ANF 901 14 Uen D3 2013-11-28 11

ASE STATION PLANNING

stations connected to the same ELU31 board. Thus one MX-ONE cord-

less phone system typically consists of several location areas. Moving

between location areas causes load on the system, and it is very impor-

tant to plan the system in such a way that this kind of load is minimized.

Base stations that cover the same areas shall, when possible, be

connected to the same ELU31 board. In larger areas additional ELU31

boards may be needed, and these shall, when possible, be inserted in

the same Media Gateway as the other boards that cover this area. In a

typical installation, one ELU31 board covers one floor, another ELU31

board covers the next floor and so on.

Larger LA reduce the roaming and hand over events.

3.2.3 Outdoor housing

The outdoor housing is a weatherproof protection case for the following

base stations:

BS330, BS340 and the BS370.

Typical applications are the base station coverage of car parks, large

factory sites and the like to protect the base stations from wind and

weather.

This case can be placed directly against a wall or fixed to a pole. It can

also be used, if base stations must be mounted in-house in areas with

aggressive environment (vapor, gas, liquids) or extreme dusts (industrial

plants).

3.3 Consequences of the base station type used

The following three base station types can be used in the cordless phone

system:

• BS330 base stations with a slightly directional antenna pattern.

This is the preferred base station in most installations, due to

smaller size and lower power consumption.

• BS340 base station with an omnidirectional antenna pattern (the

same signal strength in all directions). Non-standard antennas can

be used to enlarge the range of a BS340 base station, see chapter

3.5 Non-standard antennas on page 16.

• The BS370 Wireless Relay Station (WRS) is a base station without

cable connection to the system. The BS370 provides coverage

where cabling is difficult or impossible, for example, in parking

areas. The radio coverage of the BS370 is comparable to the radio

coverage of the BS340.

CORDLESS PHONE

12 5/1531-ANF 901 14 Uen D3 2013-11-28

Note: The BS370 base station is not for new delivery, product is in

passive sustaining.

For more information about transmission pattern see chapter 6 Appendix

B: Radio base station signaling pattern on page 44.

3.4 Total area coverage

The base station coverage depends on the following factors:

• The indoor cell size in offices may be in a range of 10 - 40m radius,

see figure 6 Example of maximum coverage of one base station on

page 15.

• The cell size in exhibition- or production halls is up to 200m radius

(when free line of sight).

• The outdoor cell size in free space may be up to 300m radius.

• The base stations may partially cover floors immediately above and

below as well. The useful range through floors and ceiling varies

between 0 and 8m (2 floors) radius See figure 12 Measurement of

a typical cell size. on page 23

In this section different configurations are shown. In normal environ-

ments, all these configurations are mixed, due to the building’s construc-

tion, the users movement and usual location.

Note: This section is based on standard antennas.

3.4.1 Minimum roaming and hand over traffic configuration

To keep the roaming and hand over traffic to a minimum, to avoid

roaming and hand over between floors and get best possible radio

performance it is preferred that the base stations are placed vertically

above each other, see figure 4 Example of a high call configuration.

ELU31 has 32 B-channel configuration. on page 14. This configuration

will also create a safer configuration in case a base station is out of

order.

5/1531-ANF 901 14 Uen D3 2013-11-28 13

ASE STATION PLANNING

Figure 3: Example of a minimum of roaming and hand over traffic.

ELU31 has 32 B-channel configuration.

3.4.2 High call traffic configuration

In this example there is double base station coverage such that more

B-channels are available for high call rate reasons in specific areas, see

figure 4 Example of a high call configuration. ELU31 has 32 B-channel

configuration. on page 14.

Note: The number of ELU31 boards should not be over dimensioned

without reason as it causes unnecessary load that may adversely

affect portable performance.

Note: In a configuration that maximise number of base stations to

reduce the number of external hand over and roaming events.

Can increase the number of connection hand over events done

on the board in a high mobile environment. Each connection

hand over event will use 2 B-channel temporarily.

Top f l o o r

3:rd floor

2:nd floor

Ground floor

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

ELU31

Media

Gateway

CORDLESS PHONE

14 5/1531-ANF 901 14 Uen D3 2013-11-28

Figure 4: Example of a high call configuration. ELU31 has 32

B-channel configuration.

3.4.3 Maximum coverage configuration

Below the base stations are placed in such a way that they give a

maximum of coverage in a low traffic environment. The disadvantage

with this configuration is that each floor is covered by base stations from

other floors. Users that are moving around on one floor will cause

roaming and handover traffic between the floors.

This configuration is recommended when it is desired to limit the number

of base stations, but should be used with care in configurations with

highly mobile users, see figure 5 Example of maximum coverage config-

uration. ELU31 has 32 B-channel configuration. on page 15

For maximum coverage of one floor, see figure 6 Example of maximum

coverage of one base station on page 15.

Top floor

3:rd floor

2:nd floor

Ground

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

ELU31

Media

Gateway

Base

station

ELU31

Base

station

ELU31

floor

High traffic zone,

2 base stations connected to same ELU31

placed next to each other.

Base

station

Base

station

Base

station

Base

station

ELU31

Media

Gateway

ELU31

Base

station

Base

station

High traffic zone,

2 base stations connected to same ELU31

placed next to each other.

5/1531-ANF 901 14 Uen D3 2013-11-28 15

ASE STATION PLANNING

Figure 5: Example of maximum coverage configuration. ELU31 has 32

B-channel configuration.

Figure 6: Example of maximum coverage of one base station

3.4.4 Redundancy configuration

If especially high redundancy is required, base stations may be

connected to different Servers on different floors if possible so, that

when one Server goes down or is out of order, the other will back up this

area. The disadvantages of this configuration is that it will cause more

inter Server roaming and hand overs.

A prerequisite for this configuration is that there is radio coverage

through the floors, see figure 7 Example of a redundancy configuration.

ELU31 has 32 B-channel configuration. on page 16.

Top f l o o r

3:rd floor

2:nd floor

Ground floor

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

ELU31

Media

Gateway

CORDLESS PHONE

16 5/1531-ANF 901 14 Uen D3 2013-11-28

Figure 7: Example of a redundancy configuration. ELU31 has 32

B-channel configuration.

Consider also the HLR/ULR configuration also when planing for redun-

dancy. HLR should be placed in the Server that controls the media gate-

ways that particular PP is mostly located. If there are no contact between

HLR and ULR server it will not be possible to call the PP. Also call from

PP and services like hand over can be rejected.

3.5 Non-standard antennas

Base stations BS340 and BS370 can be equipped with non-standard

antennas. The non-standard antennas may enlarge the range of a

BS340 and a BS370 base station and reduce the total number of base

stations in a cordless system.

Note: The non-standard antennas for BS370 are used to enlarge the

distance between BS370 and the assigned host base station.

Indoors

The use of non-standard antennas for indoor applications is limited to

specific situations where the radio coverage is the most important factor.

Examples in which non-standard antennas may be used are: large

production halls, long corridors (directional antennas), coverage of bad

radio spots and for expanded base station coverage. When compared to

the standard base station antennas, non-standard antennas are more

expensive, less easy to install and usually larger. These disadvantages

do normally not justify the use of non-standard antennas in an office

environment.

Outdoors

Top flo o r

3:rd floor

2:nd floor

Ground floor

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

Base

station

ELU31

Media

Gateway

ELU31

Media

Gateway

Media gateway are connected to different servers.

Or same server with backup server.

5/1531-ANF 901 14 Uen D3 2013-11-28 17

ASE STATION PLANNING

In outdoor applications good coverage is usually required instead of

capacity. Omnidirectional antennas can be used for large areas like

parking places. Directional antennas can be used for example to cover

large walking distances between buildings. For outdoor placing of base

stations, a special protection case is available for wall or pole mounting.

See chapter 3.2.3 Outdoor housing on page 11.

3.6 Absorption and reflection

The cell size is very dependent on the material of which walls, ceilings

and floors are made.

• Glass, concrete, wood and plaster all absorb and pass radio signals

in different ways.

• Metal walls and large metal cabinet rows reflect all signals,

resulting in a greatly reduced coverage behind these areas. They

can also cause reflections and bit errors.

• X-ray rooms in hospitals protected by lead walls or computer rooms

in banking buildings protected against unwanted interference do

not allow radio signals to enter.

• Exhibition halls or production halls may give reflections due to huge

metal structures. This causes interference and bit errors, which

reduces the capacity, coverage range per base station, speech

quality and the practical coverage area.

3.7 Architecture

• Central areas giving access to stairs and elevators may require

extra base stations due to heavier constructions.

• Coverage in elevators may require base stations close to or in the

elevator shaft.

• Corners and irregularities in the construction have influence.

• Physical fire walls and closed fire doors can have great influence.

3.8 Physical location of a base station

To reduce the traffic load in each Media Gateway, and between Media

Gateways, it is recommended to pay special attention to the physical

CORDLESS PHONE

18 5/1531-ANF 901 14 Uen D3 2013-11-28

location of the base stations and how they are connected to the

MX-ONE.

Base stations that cover the same or adjoining areas, should, when

possible, be connected to the same ELU31 board. When this is not

possible, the base stations should be connected to ELU31 boards in the

same Media Gateway.

When that is not possible should the ELU31 boards should be in a Media

Gateway served by same server.

The boarder between an area covered by one server and an other server

should be, if possible, where none or few persons have there working

space or where there is little movement/roaming.

Figure 8: Physical location of base stations with standard antennas

connected to the same ELU31 board

5/1531-ANF 901 14 Uen D3 2013-11-28 19

ASE STATION PLANNING

Figure 9: Example of a frequently visited area

The picture above shows an example of a frequently visited area, for

example, entrances & conference rooms, see figure 9 Example of a

frequently visited area on page 19.

This configuration will distribute the user traffic between different ELU31

boards in a highly mobile traffic area.

It is important to install the base stations with an equal distance from

where the users frequently enter the area.

Using BS370

See figure 10 Coverage of the BS370 without extra antenna on page 20

is an example with BS370 equipped with standard antennas. In this

example it is full hand over between the four coverage areas.

See figure 11 Coverage of the BS370 with an extra antenna to connect

with a host base station on page 21 shows an example with BS370

ELU31

Media

Gateway

ELU31

Entrance

Base

station

Base

station

Base

station

Base

station

CORDLESS PHONE

20 5/1531-ANF 901 14 Uen D3 2013-11-28

equipped with an extra antenna. In this example hand over is not

possible between the two coverage areas.

To get optimal performance the BS370 shall be placed in line of sight

from the designated base station.

Figure 10: Coverage of the BS370 without extra antenna

Page is loading ...

Aastra Cordless Phone Installation Planning

Aastra Cordless Phone Installation Planning

Aastra Cordless Phone Installation Planning

Related papers

Other documents