| 摘要 |
PROBLEM TO BE SOLVED: To remove a flow cell through the use of a general flow control field existing in a header by transmitting/receiving a signal cell, retrieving the general flow control field against a maintenance cell and removing the floating cell. SOLUTION: The general flow control processing logic 31a of a processor part 31 inspects the general flow control field of the transmitted cell, generally processes the maintenance cell when it is the normal cell and abolishes it when it is the floating cell. Remote defect recognition cells and continuity inspection cells, which are generated from respective terminals, are treated in the same way as remote relay cells. The continuity inspection cell and the remote defect recognition cell among signal/meter signal cells, an inter-subscriber communication cell, remote relay cells and the maintenance cells between the subscriber and a network by a cell relay and an add/drop function part 32. A processing for a warning recognition signal cell and a system management cell in the maintenance cells is executed by an ATM hierarchy processing part 34 and the processor part 31. |
