求翻译：稳定48小时后，对光缆进行绝缘及电气性能测试，待测试合格后进行回填，并把所有挖出的土全部回填至光缆沟上，使缆沟成凸形。是什么意思？

Stable after 48 hours, insulation and electrical performance testing of fiber optic cable to be tested after backfilling, and all backfilling all excavated soil on the fiber optic cable trench, cable trench into convex.

After 48 hours, and stability of the fiber optic cable insulation and electrical performance tests, to be tested after the backfilling and dug out all of the all fiber optic cable trench backfill to the cable and a male.

After the stable 48 hours, carry on the insulation and the electrical specification test to the optical cable, after wait the test qualified to carry on the backfill, and the earth complete backfill which all digs out to the light cable channel on, cause the cable channel to become the convexity.

Stable after 48 hours, cable insulation and electrical performance testing, test after passing the backfilling, and all backfill soils all excavated to the cable on the Groove, cable Groove into a convex shape.

正在翻译，请等待...