Motorola PTP 500 User's Guide Page 70
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Wireless operation Chapter 1 Product description
phn-1115_006v000
1-30
Sep 2010
Synchronized networks
TDD synchronization can be used to relax constraints on the frequency planning of
PTP 500 networks. Synchronization has the following benefits:
• Allows tighter frequency re-use, and thus wider channel bandwidth.
• Allows more convenient collocation of units on a single mast.
• Allows use of smaller or lower performance antennas.
• Reduces inference, resulting in use of more efficient modulation modes.
NOTE
TDD synchronization is not supported in the PTP 300 Series.
In a correctly designed synchronised network, all links are configured with the same
TDD frame duration, and the TDD frame contains guard periods longer than the
propagation delay between the most distant interfering units.
Each synchronized unit is assigned to one of two phases. A master ODU can be
assigned to either phase. A slave ODU must be assigned to a different phase from the
associated master ODU. The phase is set by suitable configuration of TDD Frame
Offset.
TDD synchronization eliminates RF interference between units in the same phase. This
means that frequency planning in a synchronized network is concerned only with
interference between units in different phases. Frequency planning is still necessary,
but the number of potential interference paths to be considered is halved. Frequency
planning in a synchronized TDD network has approximately the same level of
complexity as frequency planning in a Frequency Division Duplex (FDD) network.
TDD synchronization
Additional hardware
To synchronize PTP 500 links, one PTP-SYNC unit is required for each master ODU.
The PTP-SYNC unit is connected in line in the drop cable between the PIDU Plus and
the ODU, and is collocated with the PIDU Plus.
NOTE
TDD synchronization is not supported in the PTP 300 Series.
- PTP 300 and PTP 500 Series 1
- Important safety information 3
- PIDU Plus 4
- Cable measuring card 4
- Non-Motorola power supply 4
- Alternative DC supplies 4
- Primary disconnect device 5
- External cables 5
- Grounding PTP-SYNC 5
- RF exposure near the antenna 5
- Minimum separation distances 5
- Safety 6
- USA specific information 8
- Contents 10
- Contents 11
- List of Figures 20
- List of Figures 21
- List of Tables 25
- List of Tables 27
- About This User Guide 29
- Revision history 30
- General information 31
- Special key sequences 32
- Contacting Motorola 33
- Reporting problems 35
- Repair and service 35
- Warranty 36
- Security advice 37
- Warnings 38
- Cautions 38
- Caring for the environment 39
- Overview 42
- Typical deployment 43
- System components 44
- Product variants 45
- Outdoor unit (ODU) 46
- ODU interfaces 47
- Mounting brackets 48
- Network connection 48
- PIDU Plus description 49
- PIDU Plus interfaces 49
- Outdoor connections 53
- Indoor connections 54
- Cable grounding kits 54
- PTP-SYNC unit 56
- PTP-SYNC unit interfaces 57
- Wireless operation 59
- Channel selection 60
- Link mode optimization 61
- Link symmetry 61
- PTP 300 62
- PTP 500 62
- OFDM and channel bandwidth 63
- Spectrum management 63
- Measurement analysis 64
- Statistical summary 64
- Adaptive modulation 65
- Radar avoidance 67
- Security 68
- Region codes 68
- PTP networks 69
- TDD synchronization 70
- PTP LINKPlanner User Guide 71
- Advantages of PTP-SYNC 72
- Ethernet bridging 73
- Management network 74
- Back-to-back links 75
- Protocol model 76
- Telecoms circuits 78
- Fixed frequency operation 79
- Further reading 79
- System management 80
- SNMPv3 security 82
- Downgrade of the license key 85
- AES license 86
- Critical security parameters 87
- Capacity upgrades 87
- Software upgrade 87
- Recovery mode 88
- Spectrum planning 90
- Available spectrum 92
- Channel bandwidth 93
- Site planning 94
- Maximum cable lengths 95
- Wind loading 95
- Wind speed statistics 96
- Link planning 97
- Path loss considerations 98
- Standards 102
- Lightning protection zones 102
- R56: Standards And 103
- Basic requirements 104
- Grounding cable requirements 104
- ODU requirements 105
- Data network planning 120
- Back to back links 121
- ‘Green Ethernet’ switches 121
- Network management planning 122
- Supported alarms 123
- Enabling SNMP 124
- Security planning 125
- Chapter 3 Legal information 129
- Definitions 130
- Grant of license 130
- Conditions of use 131
- Title and restrictions 132
- Confidentiality 132
- Right to use Motorola’s name 133
- Transfer 133
- Updates 133
- Maintenance 133
- Disclaimer 134
- Limitation of liability 134
- U.S. government 135
- Term of license 135
- Governing law 135
- Assignment 135
- Survival of provisions 136
- Entire agreement 136
- Third party software 136
- OpenSSL 141
- Hardware warranty 151
- Limit of liability 152
- Installation inventories 154
- Kit contents 160
- Regional variants 160
- ODU specifications 165
- ODU environmental 166
- PIDU Plus specifications 167
- PIDU Plus electrical 168
- Indoor CAT5e cable 170
- Antenna specifications 171
- PTP-SYNC specifications 179
- PTP-SYNC electrical 180
- Timing inputs 180
- Wireless specifications 182
- Licenses and region codes 184
- Available spectrum settings 188
- Data network specifications 206
- System management data 207
- Email alerts 208
- Safety compliance 209
- Electromagnetic compliance 210
- Radio certifications 211
- Compliance with regulations 212
- Deployment and operation 213
- Registration of links 213
- Electromagnetic energy 217
- Power density exposure limit 218
- Calculation of power density 218
- PTP 54300 and PTP 54500 221
- PTP 58300 and PTP 58500 222
- Notifications 224
- Data rate calculations 229
- Procedure 230
- Example 231
- Data throughput capacity 232
- Range adjustment curves 239
- Chapter 5 Installation 241
- Preparing for installation 242
- Preparing tools 243
- Safety precautions 244
- Assembly 245
- Installing the ODU 253
- Mounting the ODU 255
- Installing the PIDU Plus 266
- Installing a PTP-SYNC unit 269
- Mounting the PTP-SYNC unit 270
- Mounting the GPS receiver 274
- Configuring QoS 294
- Generating a new license key 298
- Entering a new license key 298
- PTP500-04-01.DLD2) 301
- Task 6: Configuring security 304
- Task 7: Setting passwords 306
- Starting installation wizard 308
- Task 9: Barring channels 325
- Task 10: Aligning antennas 326
- Aligning antennas 327
- Method #3: graphical install 333
- Disarming the units 334
- Connecting to the network 338
- Setting the real-time clock 339
- Starting SNMP wizard 343
- Start SNMP wizard 352
- Chapter 7 Operation 361
- Web-based management 362
- Menu navigation bar 363
- Using the menu options 364
- Viewing the system summary 366
- Alarm display 367
- Viewing the system status 371
- Histogram data 379
- Managing spectrum 380
- Barring a channel 383
- X axis and Y axis 385
- Channel states 385
- Key metrics 387
- Managing performance 398
- System histograms 400
- System counters 402
- Checking detailed counters 405
- Downloading diagnostic data 410
- Rebooting the unit 412
- Using recovery mode 413
- Selecting a recovery option 414
- Upgrading software image 416
- Erasing configuration 418
- Chapter 8 Troubleshooting 421
- Testing link end hardware 422
- Power LED is off 425
- Power LED is flashing 426
- No Ethernet activity 428
- Irregular Ethernet activity 428
- Connection is not 100 BaseT 428
- Test ping packet loss 430
- Testing the radio link 434
- Some activity 435
- Testing PTP-SYNC 437
- SYNC units 438
- Testing a telecoms link 439
- Glossary 441
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