Grandstream Networks DP750 Guida di riferimento rapido

Grandstream Networks, Inc.

DECT Deployment Guide

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DECT Deployment Guide

Table of Contents

INTRODUCTION.............................................................................................................4

GRANDSTREAM IP DECT SOLUTION .........................................................................5

SITE PLANNING AND CONSIDERATIONS...................................................................7

Wireless Range......................................................................................................................................7

Site Survey and Interference Factors ....................................................................................................7

Capacity Planning ..................................................................................................................................9

DEPLOYMENT GUIDE .................................................................................................10

Using Multiple Base Stations ...............................................................................................................10

Cell Coverage ...............................................................................................................................10

Single Floor Buildings ...................................................................................................................10

Multi Floor Buildings .....................................................................................................................12

Using DECT Repeater .........................................................................................................................12

Pairing DP760 with DP750 Base Station .....................................................................................12

Deploying DP760 Repeater ..........................................................................................................14

ON-SITE MEASURING.................................................................................................16

Installing Base Station .........................................................................................................................16

Using Handset for Reception Measurement........................................................................................16

Test Calls and Optimization .................................................................................................................17

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DECT Deployment Guide

Table of Tables

Table 1: DP750 Specifications Overview ......................................................................................................6

Table 2: DP720 Specifications Overview ......................................................................................................6

Table 3: DP760 Specifications Overview ......................................................................................................6

Table 4: Radio Attenuation for different Materials .........................................................................................8

Table 5: Number of Concurrent Calls............................................................................................................9

Table 6: RSSI Values Evaluation.................................................................................................................16

Table of Figures

Figure 1: Attenuation Phenomenon ..............................................................................................................8

Figure 2: High Traffic Area ............................................................................................................................9

Figure 3: Single Floor Building Deployment................................................................................................ 11

Figure 4: Wide Area Deployment ................................................................................................................12

Figure 5: Enable Repeater Mode ................................................................................................................13

Figure 6: DECT Repeater Status on DP750 ...............................................................................................13

Figure 7: 5 Repeaters in Star ......................................................................................................................14

Figure 8: DP760 Deployment......................................................................................................................15

Figure 9: RSSI Information..........................................................................................................................17

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DECT Deployment Guide

INTRODUCTION

Most enterprise networks are including more and more wireless technologies on their infrastructure and

with the well-known WiFi standard for wireless data transmission, DECT technology sits as the most reliable

solution for on premises telephony systems which are managed by local PBX. This guide illustrates the

steps and recommendations to setup a DECT system using our DP750 base station, DP720 handset and

the repeater DP760. Beside DECT and wireless aspects, it also addresses network requirements, capacity

planning and measuring methods to ensure good coverage and call quality on customers sites.

Deployment of base stations and repeaters is a central aspect of any DECT phone solution. To successfully

deploy the DECT phone system, the deployment concepts, recommendations and methods explained in

this guide shall be followed.

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DECT Deployment Guide

GRANDSTREAM IP DECT SOLUTION

About DECT

DECT stands for Digital Enhanced Cordless Telecommunications. DECT is a digital wireless technology

which was originated in Europe that’s why earlier DECT used to stands for Digital European Cordless

Telecommunication, but is being adopted increasingly worldwide especially America, for cordless

telephones. DECT has been especially designed and specified to interwork with many other types of

network which allows communication, such as the PSTN (conventional telephone networks), ISDN (new

digital and data phone networks), GSM (mobile phone networks) and more. DECT has been developed for

short distance communication and large number of user which make them ideal for home cordless phones

and small medium size enterprises.

Some DECT Properties:

•Audio codec: G.726.

•Net bit rate: 32 kbit/s.

•Frequency: 1880 MHz–1900 MHz in Europe, 1920 MHz–1930 MHz in the US.

•Carriers: 10 (1,728 kHz spacing) in Europe, 5 (1,728 kHz spacing) in the US.

•Channel allocation: dynamic.

•Average transmission power: 10 mW (250 mW peak) in EU, 4 mW (100 mW peak) in the US.

Advantages of DECT:

•High Subscriber Density.

•1.8Ghz Frequency Band specially allocated for DECT devices.

•Interference Free Communication.

•Faster and secure communication.

Grandstream IP DECT Solution

Grandstream offers a reliable IP DECT solution based on the combination of DP750 base station and

DP720 handset along with a powerful DECT repeater DP760 which helps increase the coverage range

when needed, the following tables list the major specifications of these devices:

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DECT Deployment Guide

Table 1: DP750 Specifications Overview

Table 2: DP720 Specifications Overview

Table 3: DP760 Specifications Overview

For more details, technical specifications and configuration please refer to the following link:

http://www.grandstream.com/products/ip-voice-telephony/cordless-ip-phones

DP750

5 DP720 handsets.

10 SIP accounts.

10 Lines.

5 Concurrent calls.

PoE power support.

300m range outdoor / 50m range indoor.

DP720

DECT Cordless HD.

1.8 inch (128x160) TFT color LCD.

250 hours standby / 20 hours talk time.

15 languages embedded.

10 accounts.

10 lines.

5 ring modes.

DP760

5 Stations in star.

2 Concurrent HD calls

PoE power support.

300m range outdoor / 50m range indoor.

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DECT Deployment Guide

SITE PLANNING AND CONSIDERATIONS

DECT deployment assessment is essential to determine elements necessary to achieve the overall

expectations of the user. This includes site survey, determination of type and architecture of the building

along with considering interference factors and finally the estimated traffic in the covered area. The following

sections will cover in more details most of these considerations.

Wireless Range

The DP750 base station sends the wireless signal in all directions making the wireless coverage in a ring

shape.

The wireless range of a DP750 base station and DP760 Repeater are the following:

- Up to 50m indoors.

- Up to 300m outdoors.

Obviously with obstructing objects the range is less than the above values.

Notes:

- For better synchronization between the base and the repeater, we highly recommend a wide

overlapping area.

- Also for better signal quality, we recommend installing the DP750 unit horizontally with LEDs facing

towards usage area. For example, if you mount it on the ceiling, it is better to have LEDs face down.

Site Survey and Interference Factors

Site survey is the process where a number of requirements and information are collected from the user as

well as any conditions that may affect the network and that should be considered during the deployment.

Begin the site survey by interviewing the user representative familiar with the full expectation of coverage

and performance of IP DECT phone solution. While asking for the following requirements:

•Planned radio coverage area.

•Capacity in terms of the number of users, handsets and connections.

•Known problem areas and what to do about them.

•Any future change on the building.

•Expected traffic behavior (hours of high density).

•Also, it is recommended to request a building plan to help in the planning process.

Another criterion that should be taken into consideration during information gathering is the interference

factors, which includes the type of material existing on the coverage area and the potential existence of

neighboring wireless signal sources and networks which can affect the performance of the planned DECT

telephony system.

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DECT Deployment Guide

Figure 1: Attenuation Phenomenon

The following table gives some general guidelines on the degree to which certain materials will obstruct the

radio signal. Users need also to check if there are neighboring wireless networks operating on the same

frequency band.

Table 4: Radio Attenuation for different Materials

Materials

Degree of Attenuation

Example

Air

None

Open Space

Wood

Low

Door, floor.

Plastic

Low

Partition.

Glass

Low

Un-tinted windows, partition.

Tinted Glass

Medium

Tinted windows, partition.

Living Creatures

Medium

Crowds, plants.

Bricks

Medium

Walls.

Ceramic

High

Tiles.

Concrete

High

Walls, floors, pillars.

Metal

Very High

Metal cabinet.

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DECT Deployment Guide

Capacity Planning

The following table resumes the number of concurrent calls supported on DP7xx

Table 5: Number of Concurrent Calls

DP750 base station

5 calls

DP760 repeater

2 calls

To avoid insufficient user experience through congested DECT network, the capacity for the DECT network

must be large enough to guarantee that the subscribers can be reached in high density traffic. A cell is at

full capacity when the number of connections required for each base station is larger than the number of

possible connections. Due to different usage patterns, the number of base station required to fulfil this

demand of voice channels may vary.

Note: The total capacity in the coverage area of a base station is always limited to the capacity of a single

base station.

To obtain more capacity in high traffic areas, users could install parallel base stations next to each other

where the cell size remains constant but the number of possible connections increases.

The DECT standard provides 120 radio channels that can be shared by several base stations. In practice,

approximately only one quarter of these channels can be used since neighboring channels interfere with

one another. Knowing that, the distance between base stations should be greater than a minimum of 2

meters.

Also note that using a large number of DECT base stations in a small area can affect the performance due

to the interference factor described above.

Figure 2: High Traffic Area

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DECT Deployment Guide

DEPLOYMENT GUIDE

This chapter contains the notion of cell coverage and the consideration to be taken when planning the

deployment of base stations around the site to achieve better quality.

Using Multiple Base Stations

Cell Coverage

As described before, the cell of a DP750 is ideally in a ring shape. But in real world situations, many

obstructions can affect the signal and the coverage doesn’t reach all intended distance. Thus, prior

measurements need to be performed in order to guarantee full coverage of the site.

For good coverage, users are recommended to place base stations at appropriate height (around 2m) and

near to the center of the site as much as possible while maintaining good signal quality in far critical points.

Single Floor Buildings

When deploying a single floor building, first we recommend that you get an existing building plan to help

you have better vision of the site. The process consists of the following steps.

Step 1: Critical points identification

Critical points are dead spots where the radio signal can hardly reach, such as a corner of a room, lifts and

stairwells. Please refer to following in order to determine and identify the critical points for placing the

deployment base stations.

1. Select the first critical point T1 located in the corner area of the site.

2. Select a nearby critical point adjacent to the first one and name it T2.

Step 2: Placement of the first base station

1. Place the temporary base stations on the critical points.

2. Measure the radio coverage and mark the limit of the radio coverage far from the 2 critical points.

3. Determine the intersection point of the two temporary coverage cells.

4. The intersection point P1 will indicate the best placement for the permanent base station since from

this point we can cover the critical points along with neighboring areas.

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