PUBLIC TELEPHONE SYSTEMS, AUTOMATIC EXCHANGE, SWITCHING SYSTEMS, SIGNAL TRANSMISSIONS (TELEPHONY)
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BTTELEPHONY + TELEPHONE ENGINEERING (TELECOMMUNICATIONS)
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UDC621.395.3
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Descriptor GERÖFFENTLICHE FERNSPRECHANLAGEN, VERMITTLUNGSÄMTER, SCHALTWERKE, SIGNALÜBERTRAGUNGEN (TELEFONTECHNIK)
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Descriptor ENGPUBLIC TELEPHONE SYSTEMS, AUTOMATIC EXCHANGE, SWITCHING SYSTEMS, SIGNAL TRANSMISSIONS (TELEPHONY)
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Descriptor FRETÉLÉPHONES PUBLICS, CENTRALE TÉLÉPHONIQUE, COMMUTATION, TRANSMISSIONS DE SIGNAL (TÉLÉPHONIE)
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NTECHO CANCELLATION + ECHO SUPPRESSION (TELEPHONY)
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NTAUTOMATIC EXCHANGES (TELEPHONY)
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NTSIGNAL TRANSMISSION + PULS TRANSMISSION (TELEPHONY)
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NTOVERLOAD (TELEPHONY)