Installation, Testing, Troubleshooting and Safety
What this domain covers
Pathway support, installation limits, field testing, fault isolation, and the safety rules that apply on a premises cabling job.
Pathways and installation
Support horizontal cable per TIA-569, typically every 1.5 m (5 ft) and within 300 mm of a box; use J-hooks rather than tight ties. Maintain bend radius: 4x outside diameter for copper installed, 10x for fiber installed and 20x during pulling; observe manufacturer pull tension, about 25 lbf for 4-pair copper. Keep separations from power circuits, firestop every penetration, and label per TIA-606.
Testing
Copper is tested as a permanent link or channel; fiber with an OLTS for loss, an OTDR for events, a VFL for breaks, and an inspection scope for endfaces. Calibrate and reference testers before use, and save results as records.
Troubleshooting
Start at the physical layer: inspection, cleaning, polarity, pinout, length, and bends. On an OTDR, a non-reflective event indicates a splice; a reflective event indicates a connector or break. Compare against the loss budget rather than guessing.
Safety
Follow NFPA 70E for electrical work, use PPE and lockout/tagout, follow ladder and fall-protection rules, treat confined spaces as permit-required, and never look into a fiber or connector; use a VFL to check for light. Keep SDS information available.
Worked example
An OTDR on a 12 km singlemode span shows a 0.9 dB non-reflective event at 6.2 km and no other anomalies. Non-reflective means splice, not connector. The 0.9 dB exceeds the 0.3 dB splice limit, so the splice is defective; re-cleave and re-fuse it, then retest with a launch cable long enough to move the first dead zone past the near connector.
Traps
Testing through dirty connectors; using the wrong reference method; skipping tester calibration; leaving penetrations unsealed; working live; unsafe ladder placement.