摘要 |
Method and apparatus that verifies integrity of communications facilities leased from another network. An idle signal is routed to the lessor network at a first point of interface and should be returned from the lessor network at a second point of interface. If the idle signal is not returned, it indicates a failure of integrity in the leased transmission facilities. If the idle signal is not returned, the type of signal that is returned may indicate a type of error that has occurred, such as equipment failure or allocation of the facility for a different purpose.
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