METHOD FOR CARRYING OUT LOOPBACK TEST

- 25 -METHOD FOR CARRYING OUT LOOPBACK TEST ABSTRACT OF THE DISCLOSURE The present invention discloses a method for carrying out a loopback test in a data communication system, which is comprised of a first data communication station, a second data communication station and a transmission line conne...

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Hauptverfasser:	AKAGI, SHIGEYUKI, SHIBUYA, TAKAHIRO, MAEJIMA, HIROSHI, FUJIMURA, NORIAKI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CALCULATING COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY PHYSICS TRANSMISSION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Zusammenfassung:	- 25 -METHOD FOR CARRYING OUT LOOPBACK TEST ABSTRACT OF THE DISCLOSURE The present invention discloses a method for carrying out a loopback test in a data communication system, which is comprised of a first data communication station, a second data communication station and a transmission line connected therebetween. The first data communication station transmits a succession of a first pseudo-random noise signals, a loopback test signal and a second pseudo--random noise signal to the second data communication station by utilizing a usual information data channel, and requires no special channel for carrying out the loopback test. When the second data communication station detects the first pseudo-random noise signal, it sends back the forthcoming loopback test signal to the first data communi-cation station in order to check the coincidence of the transmitted and the sent back loopback test signals. The second pseudo-random noise signal denotes the finsihing of the loopback test.