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Yoichi NAGATA Masataka HIRAI Shigeyuki SEIKAI Koichi TAKAYAMA Hiroshi OSANAI
A optical cable of eight step index fibers was installed in a duct. Prior to laying the cable, four subducts were laid in the duct to allow independent laying of four cables. A cable jointing test was implemented in a manhole. A 32 Mbit/s transmission system was tested on a 5.15 km fiber link.