DATA TRANSMISSION APPARATUS AND DATA TRANSMISSION METHOD

摘要

When receiving a marker cell indicative of a timing of switching between current use and reserve use, system switching control section 280-1 in first transmission path interface section 270-1 that is for current use in the initial state notifies system switching control section 280-2 for reserve use of the contents of reading order table and reading pointer. Until marker cells are detected in buffers for all quality classes after receiving a marker cell, read section 276-1 for current use continues to read cells based on the reading order table and reading pointer, while read section 276-2 for reserve use abandons cells based on the reading order table and reading pointer notified from system switching control section 280-2. Then, when marker cells are detected in the buffers for all the quality classes in the system for current use, switching is performed from the current use to reserve use.