Patent
1984-10-26
1986-09-16
Schreyer, Stafford D.
1791752R, H04M 328
Patent
active
046124217
ABSTRACT:
Apparatuses which are, for example, used in telephone central exchanges or transmission arrangements have become increasingly more complicated. Interruptions in the transmission path within the apparatus can be detected with the aid of a test arrangement which comprises at least one transmitter, at least one receiver, and a control device. To that end, the transmitted test signal is compared with the received test signal. To reduce the cost and design efforts of the test arrangement and to avoid the use of switches which are susceptible to trouble, transmitters or receivers are arranged in the modules at the inputs or outputs of the modules. Signals from the control device can also be used for producing the test signal and to control the evaluation. The control device ends the test cycle when the transmitted test signal is received in the receiver. The transmission of useful signals and the test signal can be effected simultaneously.
REFERENCES:
patent: 3937908 (1976-02-01), Funk et al.
Spath Gunther
Zeder Werner
Briody Thomas A.
Goodman Edward W.
Schreyer Stafford D.
Streeter William J.
U.S. Philips Corporation
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