device for protecting verkehrskarten low / high order in a transmission device for synchronous digital hierarchy

摘要

A protecting device for low-order/high-order service board in synchronous digital transmission equipment is composed of a stand-by high-order/low-order service board arranged in service region, a group of low-order/high-order producing buses arranged in backplate for connected to low-order/high-order interface board, and a low-order/high-order protecting board inserted in the slot of said interface board for connecting the low-order/high-order protecting bus with with the bus of said stand-by service board.