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PTP 800 Series User Guide Testing the ODU and IF cable
phn-2513_004v000 (Oct 2012)
5-67
Measuring distance to fault
The distance to fault (DTF) test is used as a means of characterizing the cable installation,
but can also be used to determine the location of a fault in an installation.
Before performing this test, ensure that the test equipment is set up as described in Test
preparation on page 5-61.
To measure distance to fault, proceed as follows:
1
Select the ‘DTF-return loss’ mode of the cable analyzer (Figure 80).
2
Select ‘DTF Aid’.
3
Use the up/down key to select and set the following:
Cable type - select LMR400 (similar to CNT-400) or LMR600 (similar to
CNT-600) as appropriate.
F2 - select the highest frequency possible for the greatest resolution, 1600 MHz.
D1 and D2 - set as appropriate for the specific installation.
4
Recalibrate the instrument.
5
Before connecting the ODU, obtain a plot of DTF loss. Compare it to an example
of a good installation (Figure 86).
6
Connect the ODU.
7
Observe the effect of the ODU connection on the DTF plot. Compare it to an
example of a good installation (Figure 87).
8
Keep a copy of the DTF plots so that they can be compared with subsequent
plots to determine if there is any degradation with time.
The absolute readings of DTF should be read with care, as many different variables affect
both distance and amplitude accuracy.
- Cambium 1
- PTP 800 Series 1
- User Guide 1
- Accuracy 2
- Copyrights 2
- Restrictions 2
- License Agreements 2
- High Risk Materials 2
- Important safety information 3
- Electrical safety 4
- Primary disconnect device 4
- External cables 4
- RF exposure near the antenna 4
- Thermal safety 4
- Contents 5
- Contents 10
- PTP 800 Series User Guide 11
- List of Figures 17
- List of Figures 18
- List of Tables 23
- List of Tables 24
- About This User Guide 31
- General information 32
- Purpose 33
- Cross references 33
- Feedback 33
- Problems and warranty 34
- Security advice 36
- Warnings 37
- Cautions 37
- Caring for the environment 38
- Licensing requirements 39
- Overview 42
- System components 45
- Link types 46
- Compact modem unit (CMU) 48
- CMU interfaces 49
- Further reading on the CMU 52
- Outdoor unit (ODU) 53
- ODU interfaces 54
- Further reading on the ODU 57
- Indoor RF unit (IRFU) 58
- Transceivers 59
- Branching unit 59
- IRFU availability 59
- IRFU configuration options 60
- 1+1 Tx MHSB / Rx SD 63
- IRFU interfaces 65
- Further reading on the IRFU 66
- Antennas and couplers 67
- Remote mounting kits (RMKs) 69
- Coupler mounting kits 70
- RFU to CMU connections 74
- CMU to network connections 74
- Wireless operation 77
- Modulation modes 78
- Maximum receive power 79
- Maximum transmit power 80
- Security 80
- Management network 83
- Out-of-band local management 84
- In-band quality of service 85
- Source address learning 85
- Wireless link down alert 85
- Protocol model 86
- Protocol layers 89
- System management 91
- User account management 92
- Identity-based user accounts 92
- Password complexity 92
- Installation wizard 93
- Configuration pages 93
- RADIUS authentication 93
- Email alerts 94
- SNMPv3 security 96
- System logging (syslog) 99
- AES license 100
- Login information 101
- Flexible capacity upgrades 101
- Software upgrade 102
- Recovery mode 102
- 1+1 Hot Standby overview 104
- Primary and secondary units 105
- Single antenna per end 105
- Bridging in 1+1 links 106
- Receive Diversity 107
- FIPS 140-2 110
- FIPS 140-2 mode 111
- Link planning 114
- Site selection 115
- Wind loading 115
- Maximum IF cable length 115
- Power supply considerations 116
- PTP LINKPlanner 117
- Standards 119
- Lightning protection zones 120
- Basic requirements 121
- Grounding cable requirements 121
- Data network planning 130
- VLAN membership 131
- IP interface 131
- Layer 2 control protocols 132
- Priority schemes 132
- Ethernet priority scheme 132
- IP/MPLS priority scheme 132
- Fast Ethernet port shutdown 133
- Security planning 134
- SNMP security mode 137
- RADIUS attributes 140
- Planning 1+0 links 142
- Choosing Ethernet switches 155
- Planning 2+0 links 161
- Ordering components 169
- Ordering antennas 171
- Ordering ODUs 181
- – 38805 MHz 700 MHz 192
- Ordering RMKs and waveguides 197
- Ordering OMKs 202
- Ordering capacity upgrades 209
- Acceptance of this agreement 212
- Definitions 212
- Grant of license 212
- Conditions of use 213
- Title and restrictions 214
- Confidentiality 214
- Right to use Cambium’s name 215
- Transfer 215
- Updates 215
- Maintenance 215
- Disclaimer 216
- Limitation of liability 216
- U.S. government 217
- Term of license 217
- Governing law 217
- Assignment 218
- Survival of provisions 218
- Entire agreement 218
- Third party software 218
- NET SNMP 221
- Hardware warranty 230
- Limit of liability 231
- Equipment specifications 234
- ODU specifications 237
- IRFU specifications 240
- Waveguide flanges 242
- Waveguide flange diagrams 244
- Coupler losses and isolation 248
- Protection cable 249
- Fiber-Y kit specifications 250
- Wireless specifications 251
- Data network specifications 303
- Ethernet bridging 304
- Syslog message formats 305
- Event messages 306
- Standard SNMP MIBs 309
- Interfaces 311
- Counters 311
- Notifications 313
- Electromagnetic compliance 314
- Compliance testing 315
- European Union notification 317
- Thailand notification 317
- Radiation hazard assessment 318
- Calculation 319
- Distances from antenna 319
- FCC method 320
- Chapter 5: Installation 323
- Preparing for installation 324
- Preparing personnel 325
- Preparing inventory 325
- Preparing tools 325
- Unit pre-configuration 326
- Installing antennas and ODUs 327
- Attaching coupler to antenna 343
- Attaching ODUs to coupler 346
- Attaching coupler to RMK 348
- Attaching antenna to pole 352
- Preparing IF cables 360
- Crimping a connector 363
- Hoisting the main IF cable 371
- Using the hoist line 373
- Testing the ODU and IF cable 382
- Test preparation 383
- Testing cable loss 384
- Expected cable loss 388
- Measuring distance to fault 389
- DTF return loss example 390
- Preparation 392
- Grounding the IRFU 396
- Connecting power to the IRFU 398
- Installing the CMU 399
- Mounting the CMU 400
- Wall mounting 401
- Rack mounting 401
- Grounding the CMU 402
- ODU-based deployments 404
- IRFU-based deployments 404
- Replacing IRFU components 417
- Replacing a transceiver 419
- Remove the transceiver 420
- Install the new transceiver 421
- Replacing a branching unit 422
- Reinstall the transceiver 423
- Replacing filters 424
- Replacing a fan assembly 425
- Replacing an RF cable 426
- Remove the RF cable 427
- Install the new RF cable 427
- Updating the ARP table 433
- Out-of-band management 436
- In-band management 437
- Generating a new license key 451
- Entering a new license key 451
- Task 5: Configuring security 456
- Configuring AES encryption 457
- Configuring HTTPS/TLS 460
- Using the Security Wizard 461
- Step 1: Enter key of keys 463
- Step 3: User security banner 464
- Setting user account options 470
- Setting password complexity 473
- Changing own user password 476
- Starting Installation Wizard 491
- Configuring SNMPv3 agent 505
- Configuring SNMPv1/2c agent 514
- Task 10: Configuring syslog 522
- Task 12: Aligning antennas 526
- Prerequisites for alignment 527
- Aligning protected antennas 527
- Aligning dual-polar antennas 527
- Aligning a pair of antennas 528
- Step 6: Aligning antennas 528
- Preparing for alignment 529
- Aligning one end 530
- Aligning the other end 531
- Post-alignment actions 531
- Step 7: Completing alignment 533
- Connecting to the network 542
- Setting the real-time clock 543
- HTTPS key size warning 551
- Chapter 7: Operation 553
- Web-based management 554
- Using the menu options 556
- Viewing the system summary 558
- Viewing the system status 559
- Status attributes 561
- Logging out 566
- Managing alarms and events 567
- Alignment mode 568
- Data port disabled warning 568
- Data port fiber status 569
- Data port status 569
- Encryption Enabled Mismatch 569
- FCC capacity check 569
- Fips Operational Mode Alarm 570
- Link name mismatch 570
- Management port status 571
- Protection Interface Status 572
- RFU Common IF Synth Lock 572
- RFU Common RF Synth Lock 572
- RFU Fan 572
- RFU High Temperature 573
- RFU RF Switch 573
- RFU RF Switch Cable 573
- RFU Rx IF Synth Lock 573
- RFU Rx RF Synth Lock 574
- RFU Status 574
- RFU Tx IF Synth Lock 574
- RFU Tx RF Synth Lock 574
- SNTP Synchronization Failed 575
- Unit Out Of Calibration 575
- Wireless link status 575
- Managing email alerts 576
- Managing SNMP traps 576
- Viewing system status 588
- Viewing alarms and faults 588
- Forcing protection switches 589
- Example 590
- Example 595
- Replacing the CMU on site 601
- Managing security 603
- Displaying login information 604
- Disabling AES encryption 604
- Changing AES encryption keys 605
- Unprotected link 606
- 1+1 Hot Standby link 606
- Changing the log-out timer 608
- Managing performance 609
- Viewing diagnostics 614
- Downloading diagnostic data 616
- Maintaining the system 618
- Licensed capabilities 619
- Upgrading software 620
- Rebooting 621
- Using recovery mode 623
- Selecting recovery option 624
- Upgrading software image 626
- Erasing configuration 628
- Downgrading PTP 800 software 629
- Chapter 8: Troubleshooting 631
- CMU out of service 633
- Check IP network connection 637
- Check browser settings 638
- Installing the link 639
- Transmitter status 640
- Antenna alignment 640
- Check waveguide and antennas 641
- Check link status 641
- Check IRFU status LEDs 642
- Glossary 645
- Glossary 646
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