| 摘要 |
An input cell processing portion 11 and an output cell processing portion 12 in a line interface 10 execute a normal ATM process and an insertion/divergence process etc with respect to an input cell flow and an output cell flow. A cell buffer 40 is constructed on an external memory device to accumulate a template (format) of ATM cells to be processed. The input cell processing portion 11 or the output cell processing unit 12 in the line interface 10 judges whether a necessity for inserting the network management cell might arise or not when processing the input cell flow. Upon detecting herein that the insertion necessity arises, the management cell template previously held on the cell buffer 40 is read, and, after a necessary data replacing process has been executed thereon, the management cell is inserted into the input cell flow or the output cell flow.
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