Monitoring optical fiber links are prone to centralized failure reports during the change of seasons from winter to spring. The reason is probably not poor quality of renovation, but rather temperature difference condensation, sand and dust, and cold shrinkage and bending that amplify hidden dangers. Inspections should focus on the location according to three types of hidden dangers.

Temperature difference condensation staring at the junction box

When the temperature is low at night and the temperature returns in the afternoon, water vapor in the box will condense on the connector end face and the surface of the equipment, lowering the light receiving power for a short time, and returning to normal in the afternoon. Such fluctuations are most easily ignored. The inspection focuses on opening the box and checking three things: whether the sealing ring is aged and deformed, whether the cable entry hole is blocked, and whether there is desiccant in the box. If the cabinet has long-term condensation, add desiccant and record the temperature of the cabinet. Observe for two consecutive weeks whether the reading stabilizes.

In windy and sandy season, check the end face first and then replace the jumper.

On windy days, dust falls on exposed jumpers and adapter end faces, causing increased insertion loss and causing occasional black screens. The inspection sequence is to clean the end face first, then measure the power again, and then check the jumper body if the reading still does not come down. The ends inside the cabinet can be replacedSingle-mode single-core armored jumpers, mouse-proof jumper pigtails, special jumpers for Internet cafes, special jumpers for cabinets, mechanically more resistant to early rat bites and repeated bending.

Cold shrinkage makes fiber coiling bends tighter

Temperature changes cause optical cables to expand and contract longitudinally at pipe openings and cabinet entrances. Jumpers that were originally neatly coiled may be bent or tightened, resulting in macrobend loss. During the inspection, the fiber coiling radii and fixed cable ties should be rechecked at these two locations. If tight bends are found, they should be recoiled before leaving; they can be used for retesting.LC-FC single mode dual core jumperCross-compare to confirm whether the original jumper is damaged.

An effective inspection method is to compare the ledger optical power: retest each core once before the season change, compare it with the activated baseline, and deal with any points with a downward trend in advance. EB-LINK technical support can assist in interpreting the retest data during working days. Tel: 0755-83179002.