Transmission apparatus with control circuit/relay within each card providing connection to related card output depending on related slot ID/ redundancy/non-redundancy, working/protection signals

A transmission apparatus in which a plurality of cards are inserted into a plurality of card slots, comprising:

• a shelf including a working card slot and a protection card slot, the working card slot supplying a first slot ID to a first card inserted in the working card slot, and the protection card slot supplying a second slot ID to a second card inserted in the protection card slot;
• a control logic circuit, provided within each of the first and second cards, which receives one of the first slot ID or the second slot ID, a redundancy/non-redundancy R/N signal and a working/protection W/P signal, and outputs a control signal depending on the related slot ID, the R/N signal and the W/P signal;
• and
• a line connection relay, provided within each of the first and second cards, which connects either a working line or a protection line to an output of the related card in accordance with the control signal supplied by the control logic circuit.