To improve workability in the mounting and demounting of an optical connector, and to correspond, even in the case of constitution having no redundancy without increasing the size.
The size of a shelf body 21 is miniaturized, by mounting a DS 3 interface connector required only in the case of constitution, having no redundant length on an extended shelf 22 in a customer interface section 25, and the shelf body can be removed in the case of a redundant structure. Optical fibers 28 can be mounted and demounted, without extracting plug-in unit by introducing the optical fibers 28 to and from the plug-in unit in oblique mounting from a device front, fiber trays 29 are mounted to a central section and a lower section respectively to the height of the shelf body 21, the width of the upper sections of the fiber trays is made smaller than lower sections and openings are formed in the longitudinal direction, and the optical fibers 28 extracted from the plug-in unit from the openings are housed.
JOKO KENJI
SHIRAGAMI TAKASHI
