Patent ID: 6052061
Filing Date: 2000-04-18
Classification: H04M,H04Q

Abstract:
A signal switching system, comprising:a common section having a pair of working and protection interface circuits;a plurality of channel sections, each having a working interface circuit connected to the working and protection interface circuits of said common section respectively via both working and protecting cables through which a data signal is transmitted from one of the working and protection circuits and connected to said pair of working and protection interface circuits of the common section via detection cable, a potential level on the detection cable being changed when the working cable connecting the working interface circuit of the channel section to the working interface circuit of the common section is disconnected or slipped; anda control circuit for controlling, for each channel section, the data signal to flow via the protection cable connected between the working interface circuit of the common section and the working interface circuit of the channel section, when said potential level is changed.