PURPOSE: To improve multiplexing efficiency by storing communication control information controlling ATM communication to be communicated between ATM exchanges in a surplus area and transmitting it in the case when a generated ATM cell has the surplus area.
CONSTITUTION: When a cell control means 1 receives data from LAN or a computer, a communication control information detection part 5 detects control information or communication from the pertinent data. A cell generating part 6 generates the ATM cell by dividing the pertinent data into data of fixed-length and adding an ATM header to each of them. A control part 4 discriminates whether the ATM cell has the surplus area or not and when it has, communication control information detected by the detection part 5 is stored in the surplus area and transferred to the ATM exchange 2. A cell resolving part 7 removes the ATM header from the ATM cell and combines fixed-length data from which the ATM header is removed so as to restore the pertinent LAN data or computer data. Thus, the congestion of the exchange 2 can be surpressed to minimum.
Kenji Tanaka
Sekihata
Hiroyuki Hatta
Furuya Reiko
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