| Day 1 |
| 1. Fiber Optic Testing Overview: |
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Basic Field Tests |
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- Continuity/Polarity
- Visual End-Face Inspection
- Attenuation/Insertion Loss
- Reflectance
- Standards Certification – Tier 1 and Tier 2 Requirements
- Fiber Characterization
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Field Test Equipment: Use and Application |
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- Visual Fault Identifier
- Optical Fiber Identifier
- Microscope
- Attenuation Test Set
- Certification Test Set
- OTDR
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Review of Consumables and Materials Required |
| 2. Insertion Loss testing: |
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- Explain the basic system configuration for insertion loss testing.
- Explain the use of jumpers during insertion loss testing.
- Develop an attenuation loss budget.
- Explain the proper application of the 1 and 2 jumper reference.
- Explain the proper application of the mandrel wrap for MM testing with a LED light source.
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| 3. Attenuation Test Set Fundamentals: |
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- Explain the keys and functions on the Noyes Power Meter and OLTS power sources.
- Mathematically evaluate jumper performance with the attenuation test set.
- Use the reference key to evaluate jumper performance with the attenuation test set.
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| 4. OTDR Fundamentals: |
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- List applications for OTDR testing.
- Explain the basic principle of operation for an OTDR.
- Explain Rayleigh Scattering
- Explain Fresnel Reflection
- Explain pulse width of the OTDR
- Explain “Dead Zone” of the OTDR
- Explain Measurement Range and Dynamic Range
- Explain the difference in 2-point verses LSA insertion loss measurements
- Explain the need for Launch and Receiving cables with OTDRs.
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| 5. Basic Trace Interpretation: |
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Identify the following events in an OTDR trace: |
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- Mated connector pair
- Dead zone
- Fusion splice
- Mechanical splice
- Angled connector pair
- Microbend/Macrobend
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| 6. Advanced Trace Interpretation: |
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- Identify and explain the occurrence of a ghost reflection.
- Identify and explain the occurrence of a gainer.
- Identify and explain the occurrence of an exaggerated loss.
- Explain the proper technique for splice loss estimation with an OTDR.
- Explain the difference between optical distance and cable sheath distance.
- Explain techniques for reconciling cable sheath distance and optical distance.
- Explain anomalies resulting from an optical distance in excess of OTDR range.
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| 7. OTDR Practicals: |
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- Check set-up parameters.
- Set-up OTDR with Launch Cable
- Position A and B cursor to reference system
- Determine system length
- Compare 2-pt loss verses LSA loss assessment of fusion splice and connectors
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| 8. Explain procedures for identifying and troubleshooting a cross-splice. |
| 9. Explain procedures for isolating a fault and reconciling optical/sheath distance in links with various cable types and constructions. |
| 10. Explain the basic fiber optic system records required to effectively troubleshoot a network. |
| 11. Prepare and build a “restoration jumper” for outside plant field repair. |
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Required Materials (provided with course by AFL) |
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- OSP Loose Tube or ADSS Cable – Length dependent on network topology. Typically based on network fiber count and span/access length (50’ to 200’)
- Splice Closures or Enclosures - (2) two Sealed or Weathertight
- Splice Trays – number dependent on fiber count
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Build “restoration jumper” by preparing fiber optic cable into splice closures and splice trays. |
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| Day 2 |
| Restoration Drill Outline: |
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- Define Drill scenario to participants
- Define Drill rules and safety requirements
- Develop hypothetical outage condition – Usually on unused pair of actual network
- Measure power output of transmitter card
- Measure receive power at receiver card
- Define simulated outage as a specific splice point or location in existing network
- Measure optical distance to splice and correlate sheath distance using “correction” factor
- Mobilize to splice point to perform simulation
- Simulate a field repair with “restoration” jumper on two dummy cables.
- Complete field repair and system reset is simulated
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| Restoration Drill Assessment: |
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This is the review and recommendations phase of the class. As a group the drill is review by all participants and a discussion of what went well and what did not go well is discussed. A list of corrective actions is developed with assignments of team leaders to correct deficiencies. A further refinement of the Restoration Drill is also discussed for the next simulation that is run in the future. A list of missing materials and equipment is developed to improved performance. |
