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The Leader in Industrial Data Communication Solutions

Training:Wireless Site SurveysPN: 154-10002-001Video PN: 158-10002-001

Section:Introduction

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Data-Linc Group

Industrial grade products include: Wireless Modems

Ethernet Radio Modems Serial Radio Modems

Copper Wire Modems Dial-up/Leased Line Dedicated Wire FSK Modems

Specialty: Analog/Discrete Multiplexers 4-Port Switch Accessory Devices

Factory pre-configured for your application

Site Surveys

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Benefits of RF Site Survey

Engineered solution, by design Reduce project cost overruns and rework Minimize startup surprises and project “creep” Maximize communication effectiveness

Minimize communication faults Consistent response times Reliable operation over project lifecycle

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Who Performs the Survey?

The Customer, the Distributor Contracted third party

System Integrator Engineering Firms (Titus Engineering) Local wireless businesses

Wireless service and/or repair Some electrical shops Radio tower sellers

Data-Linc - $800/day plus expenses Skills required:

Understand Line Of Sight (LOS) requirements Ability to configure and install Data-Linc radio systems and correct

possible abnormal operation May require work at heights

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Site Survey: When?

Alternatives Analysis & Preliminary Design Theoretical Survey Physical Survey

Detailed Design Generate a Bill Of Materials

Project Startup Sustaining

Conduct Site Surveys in early stages of project

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Types of RF Surveys

Demo Only Theoretical Physical

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Example Survey Result

Station Colors Yellow – Master Blue – Existing Green – Phase 1 Red – Phase 2

Section:RF Survey Types

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Survey Type: Demo Only

Data-Linc/Distributor provide demo equipment Conducted in the field Rapid equipment setup and test For:

Small, straight forward projects Indoor or short range outdoor projects with significant LOS

interference Examples:

RF path is from building to building through interior and exterior walls

Moving equipment around obstacles in the warehouse A mile through trees

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Survey Type: Theoretical

Theoretical – Mostly performed in the office For most outdoor, multiple station projects Requires prior collection of site coordinates Only as accurate as maps and coordinates provided No visibility of trees, vegetation, buildings and other such RF

obstacles Can be performed

Manually: using maps, compass, pen and paper Semi-automatically: using RF computer programs

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Survey Type: Physical

Physical – Always performed in the field Demo only survey is a quick physical survey For almost all projects and typically uses demo equipment

Must have a repeatable plan for study of each site to Collect radio performance data Prove the theoretical study by confirming RF quality

Possible Requirements: Radios, coax and antennas to build a test network Temporary installation of “fixed” equipment A vehicle to be a radio site on wheels

Radio equipment, laptop, GPS and power A means of achieving expected antenna heights

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Survey Steps

Step 1 – Preliminary Data Collection Step 2 – RF Network Design Step 3 – Theoretical Survey Step 4 – Physical Survey Step 5 – Complete Summary Report

Section:RF Survey Steps

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Step 1 - Collect Information

Project scope and Implementation Plans Identify Key contacts Potential Competition Cost targets Timelines

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Step 1 - Collect Information (1)

Obtain Topographic Maps Identify all sites - existing and future

Station Name Station Purpose GPS Coordinates with altitude

Identify possible repeater sites Identify potential RF noise sources Identify inter-site process relationships

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Step 2 -RF Network Design

Determine RF band Determine level of redundancy Develop Network Architecture

Keep inter-site processes on the same radio network Estimate system response times Estimate data throughput requirements

Estimate amount of data Estimate data update rates

Partition network as required to Improve response times Reduce failure vulnerabilities

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Step 2 - RF Network Example

Tie

r O

ne

Net

wo

rkT

ier

Tw

o N

etw

ork

Region One

Many wireless DF1 RTUs

1 2 3 4 5 6 7 8 U D

10 Base-T 8 Port Switch

PanelView

SLC5/05 orControlLogix

Switch

SRM6210E

SRM6000

CH0 DF1

Region Two

Many wireless DF1 RTUs

1 2 3 4 5 6 7 8 U D

10 Base-T 8 Port Switch

PanelView

SLC5/05 orControlLogix

Switch

SRM6210E

SRM6000

CH0 DF1

Region Three

Many wireless DF1 RTUs

1 2 3 4 5 6 7 8 U D

10 Base-T 8 Port Switch

PanelView

SLC5/05 orControlLogix

Switch

SRM6210E

SRM6000

CH0 DF1

Central Control

PC HMI

1 2 3 4 5 6 7 8 U D

10 Base-T 8 Port Switch

Switch

SLC5/05 orControlLogix

SRM6210E

ALLEN-BRADLEY

SLC5/0X CPUFORCE

RS232

RUN

FLT

BATTRUN REM PROG

ALLEN-BRADLEY

SLC5/0X CPUFORCE

RS232

RUN

FLT

BATTRUN REM PROG

ALLEN-BRADLEY

SLC5/0X CPUFORCE

RS232

RUN

FLT

BATTRUN REM PROG

ALLEN-BRADLEY

SLC5/0X CPUFORCE

RS232

RUN

FLT

BATTRUN REM PROG

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Step 2 - Station List Example

Function Link To Name Long Lat Elev

Master NA 521/531 Chlor 123°39'24"W 48°51'49"N 106.0m

Slave Master 519 SS 123°37'59"W 48°51'42"N 12.0m

Slave Master 520 SS 123°38'10"W 48°51'42"N 10.0m

Slave Master 522/532 WPS 123°39'02"W 48°51'49"N 65.0m

Slave Master 541 TP 123°38'35"W 48°51'58"N 23.0m

Slave Master Chilco Res 123°37'51"W 48°51'04"N 151.0m

Slave Master Robert Str Res 123°39'22"W 48°51'48"N 106.0m

Rptr/Slv Master 517 PS 123°39'24"W 48°52'23"N 43.0m

Slave 517 PS 503 Chlor 123°46'17"W 48°54'41"N 148.0m

City “B” Network

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Step 3 - Theoretical Survey

Using maps and station location data For each wireless network

Plot all locations Plot desired RF links Resolve LOS issues or weak RF links by

Adjusting antenna types and height, or Convert slaves to repeater slaves, or Find new repeater sites

Repeat above steps till satisfied Create Reports

Cross-sectional Drawings Calculate RF quality for each path Make recomendations

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Step 3 - Map Example

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Step 3 – Cross-section Example

RF SourceStation

ThisLocation

Terrain Cross-

Section0.6 Fresnel Zone

Distancebetween

antennas

Minimum

clearance on RF

PathCalculated RF

Path LossCalculated Receiver

Signal Strength

Cross-Sectional Plot Explanation

The RF Path

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Step 4 - Physical Survey

Decide on test plan Apply plan consistently Determine testing technique

Radio loopback Use User Equipment

Method to record test results

Install fixed equipment Prepare mobile remote Prepare report

Record results and observations Make recommendations

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Step 4 – A Data Collection Form

This Location:    

       

  Operating Mode: Master  

  Antenna Test Height: 20 meters  

  Expected Antenna Type: Yagi  

  Estimated Final Coax Length: 75 feet  

       

RF Sources:    

  Source Name Signal Level Noise Level % Rcv Rate  

           

           

           

           

       

Notes:    

     

   

   

Conclusions:    

     

   

   

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Accessing SRM RF Path Statistics

MODEM STATISTICS

Master-Slave Distance(m) 0000796

Number of Disconnects 0Radio Temperature 30Antenna Reflected Power 0Transmit Current (mA) 0000 Local Remote1 Remote2 Remote3 J dBm dBm dBm dBmNoise 52 115Signal 75 90Rate % 855E49F2

Press <Ret> for Freq Table, <Esc> to return to main menu

From Main Menu choose option 4

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The Leader in Industrial Data Communication Solutions