GE MDS MDS iNET-II 900, Reference Manual

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05-2806A01, Rev. H iNET Series Reference Manual v
4
PLANNING A RADIO NETWORK ........................... 127
4.1 INSTALLATION PLANNING ............................................................................................. 129
4.1.1 General Requirements ...........................................................................................................129
DIN Rail Mounting Option ............................................................................................................131
4.1.2 Site Selection .........................................................................................................................131
4.1.3 Terrain and Signal Strength ....................................................................................................132
4.1.4 Antenna & Feedline Selection ................................................................................................132
4.1.5 How Much Output Power Can be Used? ...............................................................................135
4.1.6 Conducting a Site Survey .......................................................................................................136
4.1.7 A Word About Radio Interference ...........................................................................................136
4.1.8 Notes on Using 28 VDC Power Supplies ...............................................................................138
4.2 RADIO (RF) MEASUREMENTS ....................................................................................... 139
4.2.1 Antenna System SWR and Transmitter Power Output ...........................................................140
Introduction ..................................................................................................................................140
Procedure ....................................................................................................................................140
4.2.2 Antenna Aiming ......................................................................................................................141
Introduction ..................................................................................................................................141
Procedure ....................................................................................................................................141
4.3 dBm-WATTS-VOLTS CONVERSION CHART.................................................................. 143
4.4 PERFORMANCE NOTES................................................................................................. 144
4.4.1 Wireless Bridge ......................................................................................................................144
4.4.2 Distance-Throughput Relationship .........................................................................................144
4.4.3 Data Latency TCP versus UDP Mode .................................................................................145
4.4.4 Data Compression ..................................................................................................................145
4.4.5 Packets-per-Second (PPS) ....................................................................................................145
4.4.6 Station-to-Station Traffic .........................................................................................................145
4.4.7 Interference has a Direct Correlation to Throughput ..............................................................145
4.4.8 Maximizing Throughput ..........................................................................................................146
4.4.9 Placing an iNET Radio Behind a Firewall ...............................................................................147
4.5 SNMPv3 NOTES .............................................................................................................. 147
4.5.1 Overview ................................................................................................................................147
SNMPv3 Accounts .......................................................................................................................148
Context Names ............................................................................................................................148
Password-Mode Management Changes......................................................................................149
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TECHNICAL REFERENCE...................................... 153
5.1 DATA INTERFACE CONNECTORS ................................................................................. 155
5.1.1 LAN Port .................................................................................................................................155
5.1.2 COM1 Port .............................................................................................................................156