OFC Lab With 24 Trainees and Six Splicers
An ITI in Rajasthan runs a Telecom Technician course with 24 trainees in a 4-hour practical slot. The OFC lab has six fusion splicers, three OTDRs, two cleavers, one joint chamber and a 100 m fibre spool. The current scheme lets trainees work in groups of four and submit one joint report per group. During the last batch, two trainees broke fibre ends while cleaving, one splicer's blade was worn, and the OTDR was returned with a dirty connector. The assessor must certify each trainee against NSQF outcomes for splicing, OTDR trace interpretation and safety. The principal wants no additional equipment this year and a plan that keeps all 24 trainees engaged for the full slot.
1. Design a station-rotation plan for the 4-hour slot that gives every trainee hands-on time on splicing, OTDR and safety without buying equipment. Include timings, group sizes and supervision.
Read the worked answer
Use four stations of six trainees each, rotating every 45 minutes after a 10-minute briefing and ending with a 15-minute debrief. Station A: splicing, with six trainees each on a splicer, supervised by the instructor; each trainee strips, cleans, cleaves, splices and protects at least two fibres. Station B: OTDR, with three pairs sharing three OTDRs; each trainee gets at least 15 minutes of hands-on setting IOR, pulse width and range, then interprets a stored trace. Station C: joint chamber and closure practice, with six trainees working on the 100 m spool under supervision, focusing on slack, bend radius and protection. Station D: safety and fault-finding, using a laser-safety briefing, fibre-scrap handling, connector inspection and a written fault scenario. Rotate A–B–C–D so every trainee completes all four. The instructor and a lab assistant supervise; the worn cleaver is removed from service before the session. This keeps all 24 engaged for four hours and gives each trainee direct contact with the core tools.
2. Write an assessment rubric for the splicing and OTDR tasks that allows individual certification, even though reports are group-based. Include safety as a gate.
Read the worked answer
Assess each trainee individually at the station, not through the group report. Splicing rubric: PPE and laser safety (gate), fibre preparation and cleanliness, cleave quality, splice loss (target at or below 0.10 dB, with 0.05 dB typical), splice protection and tray management, and housekeeping. OTDR rubric: correct IOR and range, pulse width choice, launch/receive fibre and connector care, event table interpretation (splice loss, connector loss, reflectance, end-to-end loss), and a short oral explanation of an anomalous trace. Safety is a pass/fail gate: any looking into a fibre or OTDR port, or disposal of fibre scraps in general waste, fails the practical regardless of splice quality. Use a four-level rubric (not yet competent, developing, competent, competent with distinction) with descriptors, and record the evidence per trainee. The group report can carry the theory and joint results, but the assessor signs the individual checklist after observing the hands-on task.
3. Justify how you would handle the damaged cleaver and contaminated OTDR connector, including maintenance, budget and record-keeping, while maintaining the training schedule.
Read the worked answer
Tag the worn cleaver out of service immediately; a bad cleave angle causes splice loss and wastes fibre. Fit the spare blade if available; otherwise book a replacement blade and a connector-cleaning kit from the consumables budget, which is small compared with the cost of failed assessments. Inspect the OTDR connector with a fibre scope, clean it with lint-free swabs and isopropyl alcohol, and verify with a reference trace before use; log the contamination incident. Adjust the rotation so cleaving is supervised at one station and no trainee uses the damaged tool. Record the incident, the maintenance action and the return-to-service check in the lab register. Add a five-minute pre-session tool inspection and a post-session connector check to the standard operating procedure, and brief trainees on why fibre scraps go into a sharps container, not the bin. This maintains the schedule without normalising defective equipment.