| 摘要 |
PURPOSE:To improve the reliability of the entire signal processing unit by forming a signal processing circuit section physically as (n+1) or (n+2) spare constitution and making the connection between a subscriber line and the signal processing unit programmable. CONSTITUTION:In addition to elastic storage devices 111-1-111-j, k-set of elastic storage devices 112-1-112-k are provided. An optical subscriber line signal is connected to an optional channel of an optional Lap D processor (120-1-120-k). Similarly, an optional channel of an optional Lap D processor (120-1-120-k) is connected to an optional subscriber line signal. If any Lap D processor is faulty, a connection control information data in a control memory 115 of a time switch 114 is rewritten and assigned to a line of a Lap D processor not in use. Thus, the high reliability of the signal processing unit is attained.
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