Why transmission lines are connected in parallel

EP0165516B1 - Call signal transmission arrangement - Google Patents

Call signal transmission arrangement Download PDF

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Publication number
EP0165516B1
EP0165516B1EP85106674AEP85106674AEP0165516B1EP 0165516 B1EP0165516 B1EP 0165516B1EP 85106674 AEP85106674 AEP 85106674AEP 85106674 AEP85106674 AEP 85106674AEP 016555516 B11EP
Authority
EP
European Patent Office
Prior art keywords
signal
ringing signal
resistor
ringing
detecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85106674A
Other languages
English (en)
French (fr)
Other versions
EP0165516A2 (de
EP0165516A3 (en
Inventor
Kenji Takato
Shoji Nojiri
Yoshimi Iijima
Kenichi Ogawa
Yasuo Fujitsu Dai 5 Ichiga-Ryo Miyazaki
Mitsutoshi Ayano
Kiyoshi Shibuya
Atsuo Serikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP108502 / 84priority Critical
Priority to JP59108502Aprioritypatent / JPH065846B2 / yes
Priority to JP59136555Aprioritypatent / JPH0318782B2 / yes
Priority to JP136555 / 84priority
Priority to JP203011 / 84priority
Priority to JP59203011Aprioritypatent / JPH0644782B2 / yes
Application filed by Fujitsu LtdfiledCriticalFujitsu Ltd
Publication of EP0165516A2publicationCriticalpatent / EP0165516A2 / de
Publication of EP0165516A3publicationCriticalpatent / EP0165516A3 / en
Application granted granted Critical
Publication of EP0165516B1publicationCriticalpatent / EP0165516B1 / de
Anticipated expirationlegal-statusCritical
Expired - Lifetimelegal-statusCriticalCurrent

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Classifications

    • H-ELECTRICITY
    • H04 — ELECTRIC COMMUNICATION TECHNIQUE
    • H04M — TELEPHONIC COMMUNICATION
    • H04M19 / 00 — Current supply arrangements for telephone systems
    • H04M19 / 02 — Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialing tone or busy tone
    • H04M19 / 026 — Arrangements for interrupting the ringing current

Claims (21)

1. Call signal transmission arrangement, with
- a transmission line (10, 11) connected to a telephone set (5);
- A generator device (9) for generating a continuous ringing signal;
- a switching device (RL) operatively connected between the transmission line (10, 11) and the generator device (9) in order to interrupt the continuous ringing signal;
- a switching control device (8) connected to the switching device for changing the continuous ringing signal into an intermittent ringing signal and for transmitting the intermittent ringing signal on the transmission line by controlling the switching device (8), the intermittent ringing signal having a signal period and has a no-signal period;
- a loop detection device (13), which is connected to the transmission line, to detect an off-hook state of the telephone set (5) during the no-signal period in the intermittent ringing signal and to generate a first output signal (LP);
- a doorbell triggerfassay device (14), which is connected to the transmission line, to detect an off-hook state of the telephone device (5) during the signal period in the intermittent ringing signal and to generate a second output signal (RTP); and
- a reset device in the switching control device (8) for resetting the switching device (RL) when the second signal indicates a non-hung state, in order to stop the transmission of the intermittent ringing signal on the transmission line, characterized by
- A logical OR gate device (18) which is operative to the loop detection device (13), to the bell trigger detection device (14) and to the switching control device (8) for transmitting a status signal (ST) to the switching control device (8), consisting of a logical sum of the first output signal (LP) and the second output signal (RTP) is connected, and
- Monitoring means in the switching control device (8) for performing a test operation in order to check the status signal (ST) of the logical OR gate device (18) in a predetermined time interval after the switching device has been reset, and in order to close the switching device (RL) again activate and put the intermittent ringing signal back on the transmission line if the status signal (ST) reflects an off-hook state of the telephone device (5) after a predetermined number of test operations.
2. call signal transmission arrangement according to claim 1, characterized in that
the continuous ringing signal has a voltage level which is superimposed on a DC voltage;
- The switching device has a bell signal transmission relay (RL); and
- The switching control device has a relay shutdown control device (8) to de-energize the bell signal transmission relay when the voltage level of the continuous bell signal crosses the level of the DC voltage immediately after a bell trigger signal has been detected by the bell trigger detection device.
3. Call signal transmission arrangement according to claim 2, further characterized by
- a phase signal generating means (91, 92, 93, 94) connected to the generating means (9) for generating a continuous ringing signal to generate a phase signal having a predetermined phase angle of each of the repeated phases of the interrupted ringing signal; and
- A locking device (8), which is connected to the ringing trigger detection device (14) and between the phase signal generating device (91, 92, 93, 94) and the ringing signal transmission relay (RL), in order to reactivate the ringing trigger signal generated by the ringing triggering detection device to a lifting operation of the telephone device (5 ) to lock out, and to output a relay drive signal in response to the phase signal, immediately after buffering the bell trigger signal, whereby the bell signal transmission relay (RL) is de-energized at the intersection of the level of the continuous bell signal and the DC voltage.
4. Call signal transmission device according to claim 1, further characterized by
- A generator device (3, 8) for generating an interrupted ring signal, which is connected between the generator device for generating a continuous ring signal and the switching device (RL) in order to generate an interrupted ring signal with a predetermined number of repeated phases, each phase having one A non-signal state and a signal state, wherein the signal period in the intermittent ringing signal is constituted by one of the repeated phases and the non-signal period in the intermittent ringing signal is constituted by the remaining phases of the repeated phases;
- and wherein the switching control device (8) switches on or off a ring signal transmission relay (RL) in response to the non-signal state of the interrupted ring signal during an off-hook state of the telephone device (5) in order to control the transmission of the one of the repeated phases of the interrupted ring signal;
the arrangement further comprising:
- a phase signal generating means (91, 92, 93, 94) connected to the generating means for generating a continuous ringing signal for generating a phase signal representing a predetermined phase angle of each of the repeated phases of the interrupted ringing signal; and
- a locking device (81), which is connected to the ringing trigger detection means (14) and is connected between the phase signal generating device (91, 92, 93, 94) and the ringing signal transmission relay (RL), in order to detect a lifting operation of the Telephone set (5) generated ringing trigger signal, and to output a relay drive signal in response to the phase signal, immediately after the ringing trigger signal has been locked, the ringing signal transmission relay (RL) is turned off at the intersection of the level of the continuous ringing signal and the DC voltage.
5. call signal transmission arrangement according to claim 4, characterized in that the phase of the phase signal is advanced with respect to the phase of the continuous ringing signal by the switch-off time of the ringing signal transmission relay (RL).
6. Ring signal transmission arrangement according to claim 1, characterized in that the continuous ringing signal has an alternating current component superimposed with a direct current component, and that the bell triggering detection device (14) comprises:
- A ring signal detection resistor (R0) which is connected to the switching device (r10, rl1) for passing the continuous signal;
- an alternating current suppressing means (OP1, R7, C1) operatively connected to the ringing signal detection resistor (R0) for respectively suppressing signal changes in the continuous ringing signal based on the alternating current component occurring at the ringing signal detection resistor; and
- a detection device (OP1, R5, R6) connected to the ringing signal detection resistor (R0) for respectively detecting changes in the direct current component from the changes in the continuous ringing signal appearing on the ringing signal detection resistor (R0) during the off-hook operation.
7. Ring signal transmission arrangement according to claim 6, characterized in that the detection device comprises an operational amplifier (OP1) which uses a voltage as the first and second input signal which occurs across the two ends of the ring signal detection resistor (r0) and has an output (V0).
8. call signal transmission arrangement according to claim 7, characterized in that the alternating current suppression device comprises an integrator (OP1, R5, C1), which is connected to the ring signal detection resistor (R0).
9. call signal transmission arrangement according to claim 7, further characterized by
- a first resistor (R.s) connected between the first input of the operational amplifier (OP1) and one end of the ring signal detection resistor (R0);
- a first capacitor (C1), which is connected between the first input and the output of the operational amplifier (OP1); and
- a second resistor (R7) parallel to the first capacitor (C1) is switched and the direct current component is selectively applied to the first resistor (Rs) wins, with the first resistance (R5) and the first capacitor (C1