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    • 2. 发明专利
    • Off-hook detection in a reverse-powered environment
    • AU2020100949A4
    • 2020-07-16
    • AU2020100949
    • 2020-06-05
    • ADTRAN GMBH
    • BOUDREAUX RUSTYSHINDEL BILLROBERTS BRIANROBINSON STEVEJOFFE DAN
    • H04M19/08H04L12/28H04M11/06
    • Abstract A method is suggested for detecting an off-hook phone, comprising (i) determining a change in a loop current of a loop connected to the phone and a reverse-powered network element, (ii) changing a source impedance for a short duration and determining a response, and (iii) depending on the response either detecting the off-hook phone and dropping the power delivery towards the network element or not detecting the off-hook phone and not dropping the power delivery towards the network element. Also, an according device for detecting an off-hook phone and a computer program product that enables performing the steps of the method are provided. Fig. 3 SZt 0- 0 o: a, 0o (a) ~~ (1 F- ) 0 3: d) = Cb ) 0~ 0~ a,) 0 0- s U -~~ 0o l - C o 0CDU 75 o0 o0 CUD - - - C =~ U) U) (10 CO) C- co 0 >P (1 0 a, -T 0~ a (1 0 C) U) C- C- a ,- 7a5 0 CU 0a) -M 0 E D- C~ 0- UC ) CD 70 -0 '- M~ 0 > a,)l DCD 0 - CD a,) U) E aU ) - ~ C) 0JC~ CD mt 0) 0 C C ) 0) IC) 0 U) X0I I II 0)) a, Co C/)o CD- U) U)- (1 - > C C- a, U) 72 0 ,- C- aa 0~~ 0o c CU) 2 _ -CD o Co 0 0 ~~d Cl) a, C)N a,1-t0 -a 0 '-) C- C- t3 CU a, -0a 0 :3 00- 0C) 0 U CU >, CU a, U C) U) U) U) Clo 0- Zc 3: C) C ) CD-a CNJ C)) SI =0o o ( 1 ) =) C) 0 m(0 U) U)0 m 0 0) cJ) c ) E 0 U :7