Line initialization method, device, and system

A central office device, comprising:

• a releasing module, configured to:
• when a new line is added, release at least one resource unit that is on a line at a Showtime stage, wherein on the line at the Showtime stage data is transmitted on a remaining resource unit that is obtained after the at least one resource unit is released;
• a basic initialization module, configured to perform basic initialization on the new line by using the at least one resource unit or a subset of the at least one resource unit, to transmit data on the new line after the basic initialization by using the at least one resource unit or the subset of the set the at least one resource unit;
• and
• a crosstalk cancellation initialization module, configured to perform crosstalk cancellation initialization on the line at the Showtime stage and the new line by using all resource units, to enable the new line to be initialized to a line at the Showtime stage, wherein all the resource units comprise the at least one resource unit and the remaining resource unit.

A central office device, comprising:

• a processor, a communications interface, a memory and a bus, wherein the processor, the communications interface and the memory are configured to communicate with one another by using the bus;
• wherein the communications interface is configured to connect to a client device by using a new line and a line at a Showtime stage;
• wherein the memory is configured to store a program;
• and
• wherein the processor is configured to execute the program to:
• when a new line is added, release at least one resource unit that is on a line at a Showtime stage, wherein on the line at the Showtime stage data is transmitted on a remaining resource unit that is obtained after the at least one resource unit is released,
• perform basic initialization on the new line by using the at least one resource unit or a subset of the at least one resource unit, to transmit data on the new line after the basic initialization by using the at least one resource unit or the subset of the at least one resource unit, and
• perform crosstalk cancellation initialization on the line at the Showtime stage and the new line by using all resource units, to enable the new line to be initialized to a line at the Showtime stage, wherein all the resource units comprise the at least one resource unit and the remaining resource unit.