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H04Q1/00—Details of selecting apparatus or arrangements
H04Q1/18—Electrical details
H04Q1/30—Signalling arrangements; Manipulation of signalling currents
H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
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Computer Networks & Wireless Communication
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Monitoring And Testing Of Transmission In General
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DE197525477861975-10-24Schaltungsanordnung zur Auswertung der Leitungszustandskrlterien bei einem nach dem CCITT-System R2 arbeitenden Ubertragungskanal in Fernmelde-, insbesondere Fernsprechanlagen
ExpiredDE2547786C2
(de)
Schaltungsanordnung zur Auswertung der Leitungszustandskrlterien bei einem nach dem CCITT-System R2 arbeitenden Ubertragungskanal in Fernmelde-, insbesondere Fernsprechanlagen
Schaltungsanordnung zur Auswertung der Leitungszustandskrlterien bei einem nach dem CCITT-System R2 arbeitenden Ubertragungskanal in Fernmelde-, insbesondere Fernsprechanlagen