174
11 Lightning
Protection
EMD
(
Lightning
) damage is not covered under warranty
The recommendations in this user manual when installed correctly give
the user the best protection from the harmful effects of
EMD
However 100% protection is neither implied nor possible
11.1 Overview
The idea of lightning protection is to protect structures, equipment and people against
lightning by conducting the lightning current to ground via a separate preferential solid path
and by reducing the electromagnetic field.
The following should be treated as a guide only, the actual degree of lightning protection
required depends on local conditions and weather patterns and applicable local regulations.
Full details of lightning protection methods and requirements can be found in the international
standards IEC 61024-1 and IEC 61312-1, the U.S. National Electric Code ANSI/NFPA No.
70-1984 or section 54 of the Canadian Electric Code.
11.1.1 Lightning Protection Zones
The installation of the ODU can be classified into two different lightning protection zones.
Zone A — In this zone a direct lighting strike is possible.
Zone B — In this zone a direct lightning strike is unusual, but the un-attenuated
electromagnetic
fi
eld is still present.
The zones are determined using the ‘rolling sphere method’, an imaginary sphere, typically 50
meter in radius is rolled over the structure. All structure points that contact the sphere, (Zone
A) indicate the zone where a direct strike is possible. Similarly points that do not contact the
sphere indicate a zone (zone B) where a direct strike is less likely.
Содержание MOTOWI 4 PTP 600 Series
Страница 1: ...PTP 600 Series User Guide MOTOROLA POINT TO POINT WIRELESS SOLUTIONS ...
Страница 2: ......
Страница 24: ...22 List of Equations 462HEquation 1 Path Loss 955H63 463HEquation 2 Link Loss 956H91 ...
Страница 113: ...111 8 3 3 Detailed Counters Page Figure 53 Detailed Counters Page ...
Страница 139: ...137 Figure 75 Spectrum Management as seen from the Master Figure 76 Spectrum Management as seen from the Slave ...
Страница 183: ...181 Figure 114 Surge Arrestor ALPU ORT Connection Illustration Note Cable screens have been sleeved ...
Страница 220: ...218 14 3 2 2 Confirm Settings and Reboot ODU Figure 135 Confirm TDD Synchronization Configuration Parameters ...
Страница 221: ...219 Figure 136 Disarm Following TDD Synchronization ...
Страница 227: ...225 Figure 142 Diagrammatically Showing the E1 T1 Connections ...
Страница 228: ...226 Figure 143 Two E1 T1 120 Ohms signal Balanced to PTP600 Interface ...
Страница 230: ...228 Figure 144 Typical Mast Installation with the addition of the E1 T1 cable ...
Страница 233: ...231 Figure 146 Surge Arrestor ALPU ORT Connection Illustration ...
Страница 237: ...235 Figure 149 QPSK 0 63 Single Payload Figure 150 QPSK 0 87 Single Payload ...
Страница 238: ...236 Figure 151 16 QAM 0 63 Single Payload Figure 152 16 QAM 0 87 Single Payload ...
Страница 239: ...237 Figure 153 64 QAM 0 75 Single Payload Figure 154 64 QAM 0 92 Single Payload ...
Страница 240: ...238 Figure 155 256 QAM 0 81 Single Payload Figure 156 16 QAM 0 63 Dual Payload ...
Страница 241: ...239 Figure 157 16 QAM 0 87 Dual Payload Figure 158 64 QAM 0 75 Dual Payload ...
Страница 242: ...240 Figure 159 64 QAM 0 92 Dual Payload Figure 160 256 QAM 0 81 Dual Payload ...
