| 摘要 |
PROBLEM TO BE SOLVED: To reduce a capacity of a buffer memory, to decrease a cell delay and to conduct quickly a restoration processing in the case that synchronization is disturbed by reducing a residence of cell in a buffer memory in a rate conversion buffer control system of a subscriber interface section of an ATM asynchronous transfer mode exchange. SOLUTION: A rate conversion buffer of a subscriber interface section of an ATM exchange is provided with a timing discrimination means 11 discriminating a phase relation of read request signals from a common section in duplicate and a timing decision means 12 to decide a read timing according to a discrimination result signal from the timing discrimination means 11. Then an ATM cell is read out of buffer memories of an active system and a standby system depending on the timing decided by the timing decision means 12.
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