| 摘要 |
In a system for transmitting data cells from a transmitter (1) to a receiver (2,3) each cell comprises a fixed format head containing address information and a free format time slice of predetermined duration. The cells may be transmitted on an or cat network (4) in which case the cells are routed by an optical switch (5) which reads the header and is transparent to the f: format time slice. Second level cells are formed comprising a second level header and a time slice filled with a number of first ~el cells.
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