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.
Summary of Contents for MOTOWI 4 PTP 600 Series
Page 1: ...PTP 600 Series User Guide MOTOROLA POINT TO POINT WIRELESS SOLUTIONS ...
Page 2: ......
Page 24: ...22 List of Equations 462HEquation 1 Path Loss 955H63 463HEquation 2 Link Loss 956H91 ...
Page 113: ...111 8 3 3 Detailed Counters Page Figure 53 Detailed Counters Page ...
Page 221: ...219 Figure 136 Disarm Following TDD Synchronization ...
Page 227: ...225 Figure 142 Diagrammatically Showing the E1 T1 Connections ...
Page 228: ...226 Figure 143 Two E1 T1 120 Ohms signal Balanced to PTP600 Interface ...
Page 230: ...228 Figure 144 Typical Mast Installation with the addition of the E1 T1 cable ...
Page 233: ...231 Figure 146 Surge Arrestor ALPU ORT Connection Illustration ...
Page 237: ...235 Figure 149 QPSK 0 63 Single Payload Figure 150 QPSK 0 87 Single Payload ...
Page 238: ...236 Figure 151 16 QAM 0 63 Single Payload Figure 152 16 QAM 0 87 Single Payload ...
Page 239: ...237 Figure 153 64 QAM 0 75 Single Payload Figure 154 64 QAM 0 92 Single Payload ...
Page 240: ...238 Figure 155 256 QAM 0 81 Single Payload Figure 156 16 QAM 0 63 Dual Payload ...
Page 241: ...239 Figure 157 16 QAM 0 87 Dual Payload Figure 158 64 QAM 0 75 Dual Payload ...
Page 242: ...240 Figure 159 64 QAM 0 92 Dual Payload Figure 160 256 QAM 0 81 Dual Payload ...
