Patent
1975-02-21
1977-07-19
Claffy, Kathleen H.
H04J 314
Patent
active
040370542
ABSTRACT:
In an exchange of a telecommunication network, which operates according to pulse code modulation (PCM) techniques, a circuit arrangement is described for monitoring the performance of a plurality of PCM couplers. The incoming and outgoing lines for the exchange are connected to the couplers, and the couplers are interconnected. An additional coupler is provided, and the input thereof is connected to the inputs of each of the other PCM couplers. The outputs of the additional coupler and the other couplers are connected, respectively, to inputs of a comparator which produces an error signal output. The error signal is used as the basis for determining whether the tested couplers are operating properly. Central control apparatus connects the additional coupler as a test unit or as a substitute for a defective coupler.
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Claffy Kathleen H.
Kemeny E. S.
Lett Gerald L.
Siemens Aktiengesellschaft
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