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This paper analyzes the connecting points of Main Distribution Frames
(MDF), which are installed between outside plants and inside plants (s
ervice nodes). This paper also proposes a connecting system for forthc
oming FITL (Fiber In The Loop) networks. NTT has developed the Subscri
ber Line Cross-Connecting Module (LXM) for the FITL network and will c
ontinue to introduce LXMs and deploy optic subscriber networks in big
cities throughout Japan.