| 摘要 |
<p>The present invention relates to a digital time switch having equipement in several parallel working planes. The digital time switch is included in a telecommunication system which operates with pulse code modulation and time multiplex. The invention is intended to solve the technical problem of detecting and accurately localizing errors or faults in a multi-plane unit. In a multi-plane unit (10) having sections (12) of equipment (11) in three parallel working planes (A, B, C), there is generated for each one of corresponding parallel sections (12) at corresponding locations a cmpressed version of the data signal (IN) entering the section and/or of the data signal (OUT) leaving the section. Corresponding cmpressed data signals (CO) are then compared, and an alarm is given when the comparison shows that there is a difference between the compressed data signals (CO) compared.</p> |
