JP2001231057A - In-band ringer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-band ringer that can test entire lines from an exchange in a station leading to subscriber's terminals. SOLUTION: A current sensor 170 of the in-band ringer detect the current of a signal sent to a 4WS 11 and gives the detected current to a control section 180. The control section 180 discriminates whether or not a signal sent to the 4WS 11 is a signal for measuring conductors and allows a built-in switch drive circuit 181 to close a relay switch 162 in a switch section 161 to throw a relay switch 163 to the position of a terminal A and to throw relay switches 165, 166 in a switch section 164 to the position of a terminal A, when the signal sent to the 4WS 11 is the signal for measuring the conductors. Through the switching above, a line 20 and the 4WS 11 are physically connected and the signal for measuring the conductors is sent to a line loop configured with the lines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an in-band ringer for transmitting a tone ringer signal such as a dial signal using a signal in a voice frequency band.

[0002]

2. Description of the Related Art An in-band ringer is a device that converts a tone ringer signal such as an outgoing call signal, an incoming call signal, and a dial signal into a signal in a voice frequency band (0.3 to 3.4 KHz) and transmits the signal to a dedicated line. is there. Inbandlinger is OD
The exchange in the office and the terminal device in the home can be connected through three types of interfaces: (Office Data) interface, extension interface and office line interface.

[0003] When a line is laid between the exchange in the office and the terminal device in the house, various line tests are performed to confirm the line state. The line test equipment is used for such a line test, and is usually installed in a station to perform conductor measurement for checking a line disconnection or the like and level measurement for measuring a line transmission loss. Do.

[0004]

However, by disposing the above-mentioned in-band ringer on the line between the exchange and the terminal device, the line is physically disconnected.
Therefore, even if a test signal is transmitted from the line test device, the line state cannot be confirmed between the in-band ringer and the terminal device. For this reason, there is a demand for an in-band ringer that can test the entire line from the exchange in the office to the terminal device in the house.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned conventional problems and to provide an in-band ringer capable of testing an entire line from an intra-office exchange to a home terminal.

[0006]

In order to achieve the above object, an in-band ringer according to the present invention is arranged on a line connecting a station and a home, and detects a signal for a line test from the station. Signal transmission means, a signal transmission means for connecting a signal line on the office side and a signal line on the inside of the house to enable transmission of the signal for the line test between the station and the house, and the signal detection means Control means for controlling the signal transmission means so that the signal line on the station side and the signal line on the inside of the house are connected only when a signal for the line test is detected. .

In particular, when the line test signal is a DC signal having a predetermined current value, the signal transmission means includes a signal line having a switch for connecting and disconnecting the signal line between the station and the home. Preferably, the signal control means controls the switch.

[0008] Preferably, the control means connects a signal line between the station and the inside of the house when the line test signal continues for a predetermined time.

Further, when the line test signal is an AC signal having a predetermined frequency, it is preferable that the signal transmission means can output the signal at the same signal level as the input signal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings. FIG. 1 is a diagram showing a configuration of an embodiment of an in-band ringer according to the present invention that enables conductor measurement. The in-band ringer 100 shown in FIG.
The four-wire office line 10 (that is, the transmission line (4W
S) 11 and the receiving side line (4WR) 12) and the two-wire home inside line 20 are connected.

The in-band ringer 100 is connected to a central office line 20 from an exchange (not shown) connected to the office line 10.
This enables the conductor measurement of the entire line to the terminal device (not shown) connected to the terminal. The signal for conductor measurement is a DC signal that continues at a predetermined current value (for example, 1 mA) for a predetermined time (for example, several ms) or more, and is transmitted from a line test device (not shown) installed in the station via an exchange. 4W
It shall be transmitted to S11.

The in-band ringer 100 includes two-line-to-four-line line converters 110, 120, 130, a loop-back unit 140,
It is configured to include diodes 141, 142, 143, 144, and a DC monitoring unit 150. The two-wire-to-four-wire line converters 110, 120, and 130 convert between the four-wire office-side line 10 that performs transmission in each direction and the two-wire home inside line 20 that performs reciprocal transmission. , And each is composed of a transformer and a capacitor.

The in-band ringer 100 includes a signal line 160, switch units 161 and 164 provided on the signal line 160, and a current value for enabling conductor measurement of the entire line from the exchange to the terminal device. It is configured to include a sensor 170 and a control unit 180.

The signal line 160 enables a DC signal to be transmitted between the 4WS 11 and the home inside line 20, and the lines are connected or disconnected by turning on and off the switches 161 and 164. The current value sensor 170 is disposed on the signal line 160, detects the current value of the signal transmitted from the exchange to the 4WS 11, and sends the detected value to the control unit 180.

The control unit 180 determines whether the signal transmitted to the 4WS 11 is a DC signal for conductor measurement or an audio signal based on the current value detected by the current value sensor 170, The switches 161 and 164 are controlled according to the result of the determination. Specifically, the control unit 180
If the current value detected by the current value sensor 170 indicates a predetermined value continuously for a predetermined time or more, it is determined that the signal is a conductor measurement signal, and the built-in switch driving circuit 181 Then, the relay switch 162 in the switch section 161 is closed, the relay switch 163 is switched to the terminal A side, and the relay switches 165 and 166 in the switch section 164 are switched to the terminal A side.

Here, as described above, the signal for conductor measurement is a DC signal that has a predetermined current value and continues for a predetermined time or more. On the other hand, the audio signal may exceed the predetermined current value only for a short time. Therefore, the control unit 180
Only when the current value detected by the current value sensor 170 indicates a predetermined value for a predetermined time or more, that is, when the signal transmitted to the 4WS11 is a conductor measurement signal, the switch unit 161 and 164 are physically connected to the 4WS 11 and the inside line 20.

By such a switching operation, the 4WS 11
And the home inside line 20 are physically connected, and a signal for conductor measurement is transmitted to a line loop formed by these lines.

When a predetermined time has elapsed since the 4WS 11 and the home inside line 20 were physically connected, the control unit 180 controls the switch unit 161 by using the built-in switch driving circuit 181. Is opened, the relay switch 163 is switched to the terminal B side, and the relay switches 65 and 166 in the switch section 164 are switched to the terminal B side. By such a switching operation, the connection between the home inside line 20 and the 4WS 11 is released, and the signal for conductor measurement does not flow in the in-band ringer 100 for a long time.
0 can be maintained.

As described above, the in-band ringer 100
When a signal for conductor measurement is transmitted from the exchange to the 4WS 11, the 4WS 11 and the home inside line 20 are physically connected, and a line loop is formed by these lines.
That is, the conductor test signal sent from the switchboard is
The signal is transmitted through the 4WS 11 and the inside line 20 to reach the terminal device, and is returned by the terminal device, transmitted through the inside line 20 and 4WS 11 and returned to the exchange. Therefore, conductor measurement of the entire line from the exchange to the terminal device can be performed.

When a signal for conductor measurement is transmitted to the 4WR 12, the 4WR 12 and the inside line 20 are physically connected in the same manner to form a line loop. Conductor measurement of the entire circuit becomes possible.

By the way, in the above-described embodiment, a case has been described in which the conductor measurement of the entire line from the exchange to the terminal device can be performed. However, the level of the entire circuit from the exchange to the terminal device can be measured. A band ringer can also be configured. FIG. 2 is a diagram showing a configuration of an embodiment of the in-band ringer according to the present invention that enables level measurement. The in-band ringer 200 shown in FIG.
Similarly to the above-described in-band ringer 100, between the 4-wire office line 10 (that is, the transmission line (4WS) 11, the reception line (4WR) 12) and the 2-wire home inside line 20. It is connected.

The in-band ringer 200 is connected to an in-house line 20 from an exchange (not shown) connected to the office line 10.
This makes it possible to measure the level of the entire line to a terminal device (not shown) connected to the terminal. The signal for level measurement is an AC signal of a predetermined frequency (for example, 1020 KHz), which is transmitted from a line test device (not shown) installed in the station via an exchange and transmitted to the 4WS11.

The in-band ringer 200 is, like the conventional in-band ringer, a two-wire line-to-four-wire line converter 2.
10, 220, 230 and the hybrid transformer 240. 2-wire line-to-wire line converters 210, 220, 230 and hybrid transformer 24
0 performs conversion between the 4-wire office line 10 in which transmission is performed in each direction and the 2-wire home inside line 20 in which reciprocal transmission is performed. 2-wire line-to-wire line conversion unit 21
Reference numerals 0, 220, and 230 each include a transformer and a capacitor.

The in-band ringer 200 includes A / D converters 250 and 260 and a D / A converter 2 in order to measure the level of the entire line from the exchange to the terminal device.
70, 280, digital signal processor (DSP)
290 are included.

The A / D converter 250 receives 4WS from the exchange.
11 is converted into a digital signal and transmitted to the DSP 290. On the other hand, the D / A converter 270 converts the digital signal sent from the DSP 290 into an AC analog signal and sends it to the home inside line 20. The A / D converter 260 is connected to the inside line 20 of the house.
Is converted into a digital signal and transmitted to the DSP 290. On the other hand, the D / A converter 280 converts the digital signal sent from the DSP 290 into an AC analog signal and sends it to the 4WS 11.

FIG. 3 is a block diagram showing a detailed configuration of the DSP 290. As shown in the figure, the DSP 290 is configured to include a frequency detector 291 and amplifiers 292 and 293. The frequency detection unit 291 is provided for the A / D converter 25.
The frequency of the digital signal transmitted from 0 is detected. D
When the frequency value detected by the frequency detecting unit 291 indicates the value of the signal for level measurement, that is, when the signal transmitted to the 4WS 11 is the signal for the level test, the SP 290 determines the frequency detecting unit 291. Is transmitted to the amplifier 292.

The gain of the amplifier 292 is set in advance so as to compensate for the conversion loss caused by the A / D converter 250 and the D / A converter 270. The amplifier 292 amplifies the digital signal transmitted from the frequency detector 291. The amplified digital signal is converted into an AC analog signal by a D / A converter 270, and
Is transmitted to

Then, the AC analog signal transmitted to the home inside line 20 is turned back by the terminal device in the house and
The signal is input to the D converter 260, converted into a digital signal by the A / D converter 260, and input to the amplifier 293. The amplifier 293 includes an A / D converter 260 and a D /
A gain that compensates for the conversion loss caused by the A converter 280 is set in advance. This amplifier 293 has an A / D
The digital signal input from converter 260 is amplified.
The amplified digital signal is converted into an AC analog signal by the D / A converter 280 and transmitted to the 4WS 11.

As described above, in the in-band ringer 200, the signal for level measurement transmitted from the exchange is:
The signal is transmitted through the 4WS 11 and the inside line 20 to reach the terminal device in the house. The terminal device is turned back, transmitted through the inside line 20 and the 4WS 11 and returned to the exchange. Therefore, the level of the entire line from the exchange to the terminal device can be measured.

When the signal for level measurement is transmitted to the 4WR 12, the signal for level measurement is transmitted to the 4WS 11 and the inside line 20 in the same manner.
The signal folded back by the terminal device in the house is transmitted to the inside line 2 of the house.
By transmitting the data to the 0 and 4WS 11, the level of the entire line from the exchange to the terminal device can be measured.

The embodiment of the present invention has been described with reference to the drawings. However, it is apparent that the present invention is not limited to the matters described in the above embodiments, and that changes, improvements, and the like can be made based on the description in the claims.

[0032]

As described above, according to the present invention, only when a signal for a line test from a station is detected, the signal line on the station side and the signal line on the inside of the house are connected to each other, so that It is possible to test the entire line from the exchange to the terminal device at home.

In particular, when the line test signal from the station is a DC signal having a predetermined current value, the signal line between the station and the home is connected to connect the line from the exchange in the office to the terminal device in the home. The entire conductor can be measured. Also, when the line test signal from the station is an AC signal of a predetermined frequency, the signal can be output at the same signal level as the input signal, so that the exchange in the station and the terminal device at home can be output. Level measurement for the entire line up to

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of an in-band ringer according to the present invention that enables conductor measurement.

FIG. 2 is a diagram showing a configuration of an embodiment of an in-band ringer according to the present invention that enables level measurement.

FIG. 3 is a block diagram illustrating a detailed configuration of a DSP in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Station-side line 11 4WS 12 4WR 20 Residential inside line 100 In-band ringer 110,120,130 Two-wire line-four-wire line conversion part 140 Loopback part 141,142,143,144 Diode 150 DC monitoring part 160 Signal Line 161 Switch section 162, 163 Relay switch 164 Switch section 165, 166 Relay switch 170 Current value sensor 180 Control section 181 Switch drive circuit 200 In-band ringer 210, 220, 230 Two-wire line-four-wire line conversion part 240 Hybrid Transformer 250, 260 A / D converter 270, 280 D / A converter 290 DSP 291 Frequency detector 292, 293 Amplifier

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 5K019 AA02 AC01 AC04 BA05 BA52 BA62 BB01 BB31 CA03 CB05 CC02 CC10 CD01 CD08 CD10 DA01 DB06 DC02 EA02 5K027 AA00 BB04 EE15 EE16 FF02 GG06 GG08 KK03 LL05 MM04 AB03 AD07 CB01 CB09 5K051 AA09 BB01 CC01 DD07 DD12 EE01 EE07 FF01 HH16 HH22 HH25 JJ02 LL02

Claims (4)

[Claims] 1. An in-band ringer arranged on a line connecting a station and a home, a signal detecting means for detecting a signal for a line test from the station, a signal line on the office side and a signal line on the inside of the home. A signal transmitting means for enabling transmission of the signal for the line test between the station and the home; and only when the signal for the line test is detected by the signal detecting means, the station side And a control means for controlling the signal transmission means so that the signal line is connected to the signal line on the inside of the house. 2. The signal for a line test is a DC signal having a predetermined current value, and the signal transmission unit includes a signal line having a switch for connecting and disconnecting a signal line between the station and the house. The in-band ringer according to claim 1, wherein control means controls the switch. 3. The apparatus according to claim 1, wherein the control unit connects a signal line between the station and the inside of the house when the signal for the line test continues for a predetermined time. Inband ringer. 4. The signal for a line test is an AC signal of a predetermined frequency, and the signal transmission means can output the signal at the same signal level as an input signal. The in-band ringer described in 1.