| 摘要 |
An upstream PCM link accommodated in a new switch is bridged to a downstream PCM link accommodated in an old switch in the normal operating condition. A test unit sends the number of a subscriber to be tested to an old and new switches. The old switch sends call control information corresponding to the directory number of a subscriber to be tested as a normal call process. A test call control information monitor in the new switch monitors whether or not the call control information is properly received through a call control information extractor provided in the new switch as a standard component. Thus, a board-to-board test can be conducted by combining a normal call function in the old switch and a standard call control information extracting function of the new switch with a plurality of subscriber signals multiplexed in physical links in the PCM link without excessively increasing a load of the switch.
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