Transmission apparatus and method

A transmission apparatus, comprising: N Ethernet MAC Support Access Control ports (RS101-1, ..., RS101-N), where each Ethernet MAC port corresponds to a physical encryption layer interface, where the encryption layer interfaces physical layer interfaces that correspond to any two different Ethernet MAC ports are distinct from each other, K Ethernet physical layer interfaces (103-1, ..., 103-K), where each Ethernet physical layer interface corresponds to one interface physical scrambling layer, wherein the physical scrambling layer interfaces that correspond to any two different Ethernet physical layer interfaces are distinct from each other, and a connecting device (102), wherein both N and K are positive integers; wherein the connection device is configured to control a time division interconnect bus in the connection device or a time division and space division switching matrix in the connection device, to implement a connection between a time slot of the physical encoding layer interface and a time slot of the physical scrambling layer interface, wherein when the connecting device is configured to control a time division interconnect bus in the connecting device, the N Ethernet MAC ports are separately connected to the time division interconnect bus in the connecting device, using the corresponding physical encoding layer interfaces, and the K Ethernet physical layer interfaces are separately connected to the time division interconnect bus in the connecting device, using corresponding physical scrambling layer interfaces; and when the connecting device is configured to control a time division and space division switching matrix in the connecting device, the N Ethernet MAC ports are separately connected to the time division and space division switching matrix. space on the connecting device, using the corresponding physical encoding layer interfaces, and the K Ethernet physical layer interfaces are separately connected to the time division and space division switching matrix in the connecting device, using corresponding physical scrambling layer interfaces.