FIG. 13 is a schematic structural diagram of a transmitter according to an embodiment of the present invention. It should be understood that, the transmitter 1300 in FIG. 13 can implement steps executed by the transmit end in FIG. 9. To avoid repetition, details are not described herein again. The transmitter 1300 in FIG. 13 a memory 1310, configured to store a program. The transmitter 1300 also includes a processor 1320, configured to execute the program. When the program is executed, the processor 1320 is configured to: obtain a to-be-transmitted service stream, where the service stream is to be transmitted using a target virtual connection supported by a physical connection group between a transmit end and a receive end, the physical connection group includes multiple physical connections and supports at least one virtual connection, and the target virtual connection is any one of the at least one virtual connection; determine, from total bandwidth resources of the multiple physical connections and according to timeslot configuration tables used by the multiple physical connections, a timeslot bandwidth resource that belongs to the target virtual connection, where a timeslot configuration table used by each physical connection is used to indicate a virtual connection to which each timeslot bandwidth resource obtained by dividing a bandwidth resource of each physical connection belongs; and transmit the service stream to the receive end by using the timeslot bandwidth resource that belongs to the target virtual connection, where a field that is used to identify content of a timeslot resource configuration timeslot configuration table in an overhead code block transmitted over each physical connection is used to transmit only a timeslot resource configuration timeslot configuration table currently used by each physical connection.
