With reference to any one of the third aspect or the foregoing implementations of the third aspect, in another implementation of the third aspect, the management channel is used to transmit the content of the timeslot configuration table and/or the content of the configuration table of the physical connection group by using an Ethernet packet, and synchronization headers of the M overhead code blocks are used for synchronization of the Ethernet packet.
With reference to any one of the third aspect or the foregoing implementations of the third aspect, in another implementation of the third aspect, some fields of the overhead code block transmitted over each physical connection are used for the management channel.
With reference to any one of the third aspect or the foregoing implementations of the third aspect, in another implementation of the third aspect, the management channel is a management channel of each physical connection. Different physical connections in the physical connection group correspond to different management channels. Content of a timeslot configuration table used by any physical connection in the physical connection group and/or the content of the configuration table of the physical connection group are/is transmitted by using a management channel corresponding to the any physical connection.