SWITCH DEVICE, AND METHOD FOR CONTROLLING FRAME TRANSMISSION/RECEPTION

摘要

Wireless line termination units (21, 22) transmit and receive frames through wireless lines (51, 52), respectively. Line termination units (25, 26) transfer frames to the wireless line termination units (21, 22), respectively. Wireless lines (51, 52) are treated as a single virtual line. A wireless monitoring unit (272) monitors the state of the wireless lines (51, 52), and instructs, in accordance with the redundancy mode, the wireless line termination units (21, 22) to discard received frames and to transfer replicated frames to the other wireless line termination unit. A communication path controller (273) sets the line termination units (25, 26) as an active system or a standby system according to the result of monitoring of the state of the wireless lines by the wireless monitoring unit (272). A switch core (271) transfers, to the line termination unit that acts as the active system, frames that are to be transmitted.