Fujitsu Corporation

Hiroaki Shirai

Shigeki Yamada

Shuji Kimura

Hiroichi Nara

Akira Maruyama

Toshiyuki Iino

Kazunori Hanaeda

An exchange changes a route of a transmission path to bypass a malfunctioning switch. The transmission path is formed in a switch network including a plurality of switches for transmitting communication information. The switch network is provided with a plurality of inputs and a plurality of outputs so that the transmission path is formed between one of the inputs and one of the outputs by routing the switches in the switch network. A malfunctioning switch detecting unit detects a location of the malfunctioning switch in the switch network. The route of the transmission path is changed by switching one of the inputs and outputs connected to the transmission path based on predetermined routing information which indicates a route to bypass the malfunctioning switch in relation to the inputs or the outputs of the switch network.

Exchange for changing a route of a transmission path to bypass a malfunctioning switch

A digital signal transmission system having monitor equipment including a serial/parallel (S/P) converter and a parallel/serial (P/S) converter both. The S/P converter is checked by the aid of a first monitor signal generating circuit that parallel distributes a pass pattern signal given at the input side of the S/P converter to respective individual channel lines for achieving a pass pattern check. The P/S converter is checked with the aid of a second monitor signal generating circuit that receives respective pass pattern signals given, at the input side of the P/S converter, to a multiplexed channel line sequentially at every frame to achieve a pass pattern check.

Digital signal transmission system having monitor equipment

Growing community of inventors

Kawasaki, Japan

Hiroaki Shirai