Fujitsu Corporation

Tomohisa Furuta

Takashi Suzuki

Kouji Tanonaka

Yasuo Takami

An SDH transmission system including a container selection unit for selectively extracting a specific virtual container VC-m of a particular hierarchy from among the uppermost layer virtual containers VC-4 obtained from a demapping circuit that is a part of the SDH transmission system, and a path overhead processing unit for processing the path overhead of the specific virtual container VC-m obtained from the container selection means. Whereby, it is possible to extract and check the path overhead of the through path and to facilitate maintenance and inspection.

SDH transmission system

A tributary interface, which performs interfacing between a high order transmission system and itself and includes a working tributary interface and a protection tributary interface as a pair for time slot interchanging with respect to the high order transmission system, is constructed so that the working tributary interface and the protection tributary interface can be operated independently. Thereby, in a time slot interchange unit of the SDH transmission system, the number of interfaces operable at a lower order side is temporarily increased so as to be able to cope with a request for temporarily increasing the number of interfaces from a user.

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Osaka, Japan

Tomohisa Furuta