With reference to any one of the fourth aspect or the foregoing implementations of the fourth aspect, in another implementation of the fourth aspect, the management channel is a management channel of the physical connection group, the multiple physical connections in the physical connection group share the management channel of the physical connection group, and content of the timeslot configuration tables used by the multiple physical connections and/or the content of the configuration table of the physical connection group are/is transmitted by using the management channel of the physical connection group.
Most fields in an overhead area are fields used for a management channel, or are occupied by a management channel. However, these fields are not fully used. In the embodiments of the present invention, a first field is defined in an overhead code block of each physical connection. The first field indicates an identifier of a timeslot configuration table used by a current physical connection, and is used to transmit, when the timeslot configuration table changes, content of a changed timeslot configuration table to a receive end using the management channel. That is, a specific field needs to be defined only for the identifier of the timeslot configuration table in the overhead area, and the content of the timeslot configuration table is transmitted over the management channel. This effectively reduces a waste of overhead resources, and provides higher flexibility.