JPH02288493A - Caller subscriber recognition information transmission circuit - Google Patents

Abstract

PURPOSE:To allow an exchange to recognize a caller subscriber even when a call comes from a subscriber system PCM transmitter by detecting whether inputted caller subscriber recognition information comes from a tip side or a ring side, generating a corresponding control signal and switching a current the same value as the detected current so as to be sent to the exchange. CONSTITUTION:A current detection means 2 detects a current flowing to the tip side and the ring side, a recognition information generating means 3 recognizes whether a caller subscriber resides in the tip side or the ring side, generates caller subscriber recognition information having corresponding frequency and sends it to an exchange side via a PCM transmission line. At the exchange side, the caller subscriber recognition information inputted by a control signal generating means 4 in the exchange is used to detect whether the caller subscriber resides in the tip side or the ring side and the corresponding control signal is sent to an interface means 5 to connect the internal switch in a prescribed way. Thus, even when a common subscriber telephone service is called via the subscriber system PCM transmitter, the exchange recognizes the caller subscriber.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a calling subscriber recognition information transmission circuit used in recognizing a calling subscriber using a differential automatic number identification method in a joint subscriber telephone service. The purpose of the present invention is to enable the calling subscriber to be recognized by the exchange even if the joint subscriber telephone service is provided via a subscriber-based PCM transmission device, current value detection means for detecting current values flowing through the tip side and the ring side of the subscriber line on the subscriber side of the subscriber system PCM transmission device when the subscriber line is provided via the subscriber line;

identification information generation means for determining whether the calling subscriber is on the chip side or the ring side by determining the difference between the input current values and generating calling subscriber identification information having a corresponding frequency; A control signal generating means for detecting whether the input calling subscriber identification information indicates a chip side or a ring side and generating a corresponding control signal on the exchange side of the system PCM transmission device; and the current value detecting means. and an interface means for switching the connection state of the internal switch by the control signal so as to send a current having the same value as the current value detected by the switch to the exchange.

[Industrial application field]

The present invention relates to a calling subscriber identification information transmission circuit used in a joint subscriber telephone service to recognize a calling subscriber using a differential automatic number identification method.

Joint subscriber telephone service makes subscriber lines economical.

Alternatively, in order to provide low-order telephone service, one subscriber line is shared by two or more subscribers.

As shown in Figure 3, when one subscriber line is shared by two subscribers, for example, the tip side telephone is connected to the tip side of the subscriber line, and the ring side telephone is connected to the ring side of the subscriber line. Because the number of calls must be automatically registered on the subscriber side, an identification part must be provided to identify the calling subscriber.

Here, one of the methods for identifying the calling subscriber is the differential automatic number identification method, which will be described later.
l Automatic Numberdentif
(hereinafter abbreviated as differential ANT method)
However, even if a joint subscriber telephone service using this method is provided through a subscriber-based PCM transmission device, it is necessary for the exchange to be able to recognize the calling subscriber.

[Conventional technology]

Although FIG. 4 shows a block diagram of a conventional example, it is also an explanatory diagram of the differential ANI method. Note that the chip side telephone and the ring side telephone are omitted except for the parts necessary for identifying the calling subscriber.

First, when the chip-side telephone is off-hook, the contact rl! ,,,re,□ turns on and becomes a dotted line,
The current from the + side of the DC power supply 13 (eg -48V) in the exchange is transmitted to the chip side current detector 11. Contact rj2+1
+ Resistor R+++ r11z+ Flows to one side through the ring side current detector 12. Also, the current from point A flows through resistor Rlt+R11+contact rj2. □, for example, flows through the ring side lightning current detector 12. As a result, +IT <
Becomes an IR. Here +IT is chip side current detector 1
The current +III flowing through the ring side current detector 12 is the current flowing through the ring side current detector 12.

Next, when the ring side telephone goes off-hook, the contact r2□I*rl2□ turns on and becomes the state shown by the dotted line, and the current from the + side of the DC voltage 13 flows through the chip side current detector 11. r/! 12. Resistor R21+ rA22+
It flows to one side through the ring side current detector 12. Due to this.

1, = 1. becomes.

Here, if we define a threshold value α such that +TR[,>α, when the chip side telephone makes a call, the chip side current detector 1
1. The difference between the current values of the ring-side current detector 12 is larger than α, and becomes smaller than α when the ring-side telephone makes a call.

This allows the exchange to identify which party made the call.

This method is the above-mentioned differential AN1 method.

[Problem to be solved by the invention]

In recent years, construction of digital communication networks has been progressing, but in order to economically and efficiently provide telephone, data, and various advanced and diverse services that combine these, it is necessary to convert subscriber lines to digital ones. As a result, terminal-to-terminal digital connectivity is required.

Therefore, in the case of a joint subscriber telephone service, the calling subscriber identification information must be transmitted from the subscriber side to the exchange using the differential ANI method via the subscriber PC transmission device. However, since power is supplied to this transmission device separately from the exchange side, an input/output cadence is used, and calling subscriber identification information, which is a DC signal, cannot be transmitted.

Therefore, when a joint subscriber telephone service is provided through a subscriber-based PCI transmission device, there is a problem in that the calling subscriber cannot be recognized by the exchange.

SUMMARY OF THE INVENTION An object of the present invention is to enable an exchange to recognize a calling subscriber even if the joint subscriber telephone service is provided through a subscriber-based PCM transmission device.

[Means to solve problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 2 is a current value detection means that detects the current value flowing through the tip side and the ring side of the subscriber line, and 3 is a current value detection means that determines the difference between the input current values and determines whether the calling subscriber is on the tip side or the ring side. An identification information generating means recognizes the calling subscriber and generates identification information having a corresponding frequency.

Further, 4 is a control signal generating means for detecting whether the input calling subscriber identification information indicates a chip side or a ring side and generating a corresponding control signal, and 5 is a control signal generating means for detecting whether the input calling subscriber identification information indicates a chip side or a ring side. The connection state of the internal switch is changed by the control signal so as to send a current having the same value as the current value to the exchange.

[Effect]

In the present invention, the current value detecting means 2 detects the current value flowing through the tip side and the ring side, and the recognition information generating means 3 calculates the magnitude of the difference between the current values and the threshold value as described above.

The system first recognizes whether the calling subscriber is on the tip side or on the ring side.

Generates calling subscriber identification information with the corresponding frequency and sends it to the PC.
It is sent to the exchange side via the M transmission line.

Here, the above-mentioned corresponding frequency is a predetermined frequency within the transmission band of the subscriber system PCM transmission device, and the frequency differs depending on whether the calling subscriber is on the chip side or the ring side.

The exchange side detects whether the calling subscriber is a chip side or a ring side using the calling subscriber identification information inputted by the control signal generating means 4, and sends a corresponding control signal to the interface means 5 to activate the internal switch. Set the connection to the specified state. This allows the calling subscriber recognition section of the exchange to recognize whether the calling subscriber is on the tip side or on the ring side.

That is, even if the joint subscriber telephone service is provided through a subscriber-based PCI transmission device, the calling subscriber can be recognized by the exchange.

〔Example〕

FIG. 2 shows a block diagram of an embodiment of the invention.

Here, the chip side current detector 21. The ring-side current detector 22 is a component of the current value detection means 2, and the microcomputer 311 oscillator 32. Amplifier 331 combiner 34, encoder/decoder 35. The transformer T1 is a component of the recognition information generating means 3.

Also, bandpass filters 41, 43. Detector 42, 4
4. Microcomputer 45. Amplifier 46 is a component of control signal generating means 4, transformer T2 + contact r l 4
11r1. □ indicates a component of the interface means 5.

For the tip side telephone and the ring side telephone, parts other than those necessary for identifying the calling subscriber are omitted, and the same symbols represent the same objects throughout the design. Also, ■ in the figure indicates the power supply voltage.

The operation shown in FIG. 2 will be explained below assuming that two subscribers share one subscriber line using the differential ANI method as in the conventional example.

First, when the tip-side telephone goes off-hook as described above, the ring-side current detector 2S22
More current flows than 1. Also, when the ring side telephone goes off-hook, the same current flows through the ring side current detector 22 and the chip side current detector 21, but these two current values are determined by the microcomputer (hereinafter abbreviated as MPU).
Added to 31.

The MPU 31 determines which telephone is in the off-hook state from the two current values, and transmits the first control signal if it is a tip-side telephone, and the second control signal if it is a ring-side telephone.
The system? 1) Send a signal to the oscillator 32.

Therefore, the oscillator is 9, for example, 2.5 at the time of the first control signal.
oscillates at 2.8Hz for the second control signal.
The single oscillation output is combined with the calling subscriber identification information and sent to the encoder section of the encoder/decoder 35 via the synthesizer 34.
The encoding part encodes 2.5 KIIz or 2.8 KHz information and sends it to the PCM transmission path.

On the exchange side, after being decoded by the decoder part of the encoder/decoder 47, one calling subscriber identification information is detected by a 2.5kllz bandpass filter 41 and a detector 42 or a 2.8kllz bandpass filter 43. The detection result is sent to the MPU 45.

The MPU 45 determines that when the output of the detector 42 is input, it is a call to the chip side subscriber, and when the output of the detector 44 is input, it is a call to the ring side subscriber, and sends a third control signal and a fourth control signal. Send a signal.

Here, contacts rj24+rj in the interface means
24□ are both turned on as shown by the dotted line when the third control signal is applied, and when the fourth control signal is applied, the contacts r24. 5, the current detectors 11 and 12 in the calling subscriber recognition unit can recognize the chip side subscriber call and the ring side subscriber call as in the conventional case.

Thereafter, the calling subscriber dials and calls the other party, and then starts a conversation.

Incidentally, the MPU 31.45 transmits the signals from the subscriber side to the exchange side at a timing such that the off-hook information→dial signal→voice signal is transmitted in this order. Also, 2.5KIIz is used when a call is made from a subscriber on the chip side, and 2.8KIIz is used when a call is made from a subscriber on the ring side. This is to avoid the frequency bands that are

This allows the joint subscriber telephone service to be
The calling subscriber can be recognized by the exchange even if the service is provided through the M transmission equipment.

〔Effect of the invention〕

As described in detail above, the present invention has the advantage that even if a joint subscriber telephone service is provided through a subscriber system r'cM transmission device, the calling subscriber can be recognized by the exchange.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of a communal telephone system, and FIG. 4 is a block diagram of a conventional example. In the figure, 2 is a current value detection means, 3 is a recognition information generation means, 4 is a control signal generation means, and 5 is an inkfels means. Switchboard exchange name (in the boiling point; I psa entry t PcM ke (d' Nanso Flo Entry Ministry, 1st rule Hikaru Mitsuro's welfare book 07 record 1st b)

Claims (1)

[Claims] In a joint subscriber telephone service, when an exchange uses a differential automatic number identification method to determine whether a calling subscriber is on the tip side or the ring side of a subscriber line, When a joint subscriber telephone service is provided via a subscriber-based PCM transmission device, a current value is provided on the subscriber side of the subscriber-based PCM transmission device to detect the current value flowing through the tip side and the ring side of the subscriber line. detection means (2); recognition information generation means for determining whether the calling subscriber is on the chip side or on the ring side by determining the difference between the input current values and generating calling subscriber identification information having a corresponding frequency; (3) is provided, and the switch side of the subscriber system PCM transmission equipment is provided with a control system that detects whether the input calling subscriber identification information indicates the chip side or the ring side, and generates a corresponding control signal. a signal generating means (4); and an interface means (5) in which the connection state of the internal switch is switched by the control signal so as to send to the exchange a current having the same value as the current value detected by the current value detecting means. What is claimed is: 1. A calling subscriber identification information transmission circuit comprising: