| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate the execution of wiring work and connection switching work without entailing a cost increase and an increase in the size of an optical wiringboard. SOLUTION: A plurality of cable side optical fibers 9 on an optical cable 46 side are switchably connected to device side optical fibers 11 on a transmission device side. An extra length absorption region 31 for absorbing the extra lengthy of the optical fibers j by curvilinear wiring is provided with a plurality of curve forming sections 41 for curving the optical fibers j hooked from above. Lower curving parts 60 turned upward below the curve forming sections 41 are formed at the optical fibers j hooked and hung down to the curve forming sections 41.</p> |
