JP2667823B2 - Connection between telecommunications carriers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to communication between first-class telecommunications carriers, and particularly to a method for connecting telecommunications carriers effective for connection to police and fire stations. is there. [Prior art] Conventionally, the interconnection between the telephone network of NTT (Nippon Telegraph and Telephone Corporation) and the telecommunications facilities of the first-class telecommunications carriers and the interconnection between the first-class telecommunications carriers are relays. It is envisaged to do so via a bureau. However, in this method, a business operator who does not have a line with the police and fire stations and cannot make a special number connection within its own network adds a complicated function to a relay station or the like so that the service to be provided is not limited. There is a need. This will be described with reference to an example shown in FIG. FIG. 3 shows a case where the A company and the B company are connected via the relay exchanges 4 and 5 and a police station and a fire station are present in the A company network. It is the same as before that the subscriber 1 in the Z1 area in the A business network can connect to the police and the fire station by the connection route 8 passing through the subscriber exchange 2. Now, it is assumed that the subscriber 7 in the B operator network is also in the Z1 area. In order to connect the subscriber 7 to the police and fire stations in the A company network Z1 area, a route 9 is required.
That is, the route is from the subscriber 7 to the subscriber line exchange 6 to the relay exchange 5 to the relay exchange 4 to the subscriber line exchange 2 to the police station and the fire station 3. In order to realize this connection, (1) it is necessary to send an identification number (for example, a message area number) indicating the accommodation area of the calling subscriber from the calling side (B operator network) to the receiving side (A operator network). There is. (2) The transit exchange 4 of the operator A network needs a translation / relay function for determining to which area of the subordinate local network to connect based on the identification number. (3) The subscriber line exchange 2 in the network of the operator A translates the incoming call from the transit exchange 4 and identifies whether or not this is a call to the police or fire station. In the case of a call to a stand, a function of connecting to a line corresponding to the stand is required. References regarding such an alternate connection between an NTT network and a first-class telecommunications carrier include, for example, “To understand the NTT communication network”, edited by the Telecommunications Association of Ohm Co., Ltd. ( Pages 347 to 3 of the first edition published on March 25, 1985)
There are 49 pages. [Problems to be Solved by the Invention] When interconnecting via a relay station according to the conventional method, the above-mentioned functions are connected to the inter-enterprise transit exchange which interconnects, and the lines to the police and fire stations. It must be added to all the local exchanges of the owning operator. SUMMARY OF THE INVENTION An object of the present invention is to provide a connection method between telecommunications carriers that can provide special services such as police and fire stations by a simple means to a company that cannot make a special number connection within its own network. is there. [Means for Solving the Problems] According to the present invention, a special trunk circuit is provided to achieve the above-mentioned object, and one of the trunk circuits is provided with a line for a police station or a fire station.
Communication between telecommunications carriers is performed by connecting the other end to the local network trunk circuit or subscriber terminal of the business operator and the other end to the local network subscriber terminal of the B business operator who does not have the above-mentioned line. In this trunk circuit, there are provided circuits for performing paging signal detection, response signal transmission, dial tone detection, response reversal signal detection, loop closing, dial transmission, call path closing, and control functions thereof. [Operation] First, attention is paid to the fact that the networks of the businesses to be interconnected are in the same district (administrative district), and that the subscribers are accommodated in the networks of the respective businesses. In FIG. 3, since the subscriber of the A company can directly connect to the police and fire stations by dialing 11X (X = 0 or 1) for calling the car, the trunk circuit or the subscriber accommodated in this local network By connecting the terminal and the subscriber terminal housed in the local network of the B company via a special trunk circuit, connection to the police and fire stations becomes possible. That is, when the subscriber of the B company dials (11X), this number is translated by the exchange of the B company, the subscriber line accommodating the trunk circuit is selected, and incoming connection is established.
The trunk circuit detects an incoming call and closes a loop to transmit a signal from a trunk circuit or a subscriber terminal of the local network of the operator A. Next, it detects the dial tone sent from the local network subscriber terminal of the A company and sends out the dialed digit 11X. As a result, the local network of the company A is connected to the police and fire stations as well as the general subscribers. When the trunk circuit detects a response signal sent from the local network subscriber terminal of the operator A, the communication line is closed to perform a call between the operators A and B. If answered, the B operator's subscriber and the table operator can make a call via this trunk circuit. Embodiment One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a relay system centered on a trunk circuit 10 for connecting a network between a company A and a company B, and detailed functional blocks in the trunk circuit 10. FIG. 2 shows the connection operation sequence including the trunk circuit 10. In FIG. 1, 10 is a trunk circuit according to the present invention, 11 is a subscriber circuit, 12 is an exchange switch, 13 is a loop closing / dial pulse transmission circuit, 14 and 17 are response inversion signal detection circuits, 15
Is a call signal detection circuit, 16 is a dial tone detection circuit, 18
Are these control circuits. Others are the same as FIG. Hereinafter, the operation of FIG. 1 will be described with reference to FIG. First, when the subscriber 7 in the company B dials 11X, this number is translated and exchanged within the local office to make the subscriber circuit 1
1. The call arrives at the subscriber circuit 11 connected to the trunk circuit 10 via the exchange switch 12. The trunk circuit 10 receives the call signal sent from the subscriber circuit 11, and detects this by the call signal detection circuit 15 (FIG. 2 (a)). This result is sent to the control circuit 18, and the control circuit 18 sends OFF-HOOK information to the loop closing / dial pulse sending circuit 13 (FIG. 2 (b)). The subscriber circuit 11 of the operator A network detects a call when the loop is closed on the trunk circuit 10 side, and as a result, sends a dial tone to the trunk circuit 10. The trunk circuit 10 detects this by the dial tone detection circuit 16 (FIG. 2 (c)) and sends the result to the control circuit 18. The control circuit 18 sends an instruction to send a dial digit (11X) to the loop closing / dial pulse sending circuit 13 (FIG. 2 (d)), and the digit is sent to the subscriber circuit 11 of the A business network. And call stand 3. When the base 3 responds, a response inversion signal is sent from the subscriber circuit 11 of the operator A network to the trunk circuit 10 and detected by the response inversion signal detection circuit 17 (FIG. 2 (e)). The control circuit 18 receives this and sends an OFF-HOOK signal (FIG. 2 (f)), and sends a response signal to the subscriber circuit 11 of the B operator network. On the other hand, since the subscriber's circuit 11 of the B operator's network sends a response inversion signal, the trunk circuit 10 detects this by the response inversion signal detection circuit 14 (FIG. 2 (g)). Further, the calling signal is stopped by this, and the trunk circuit 10 detects this by the calling signal detecting circuit 15. (Fig. 2 (h)). Then, the control circuit 18 receives this detection result,
The communication path is closed (FIG. 2 (i)). As described above, the subscriber 7 of the B operator and the table 3 of the A operator are connected to the subscriber 7 -subscriber circuit 11 -exchange switch 12 -subscriber circuit 11 -trunk circuit 10 (above B operator network) -subscription. The communication state is established on the route of the user circuit 11-switch 12-unit 3 (A business network). In the case of police and fire stations, two types of special functions other than the general call function are required: last party release and recall. The former can be realized by distinguishing between the OFF-HOOK state of the subscriber 7 and the OFF-HOOK state of the table by the trunk circuit 10.
That is, when both the subscriber 7 and the stand 3 are in the OFF-HOOK state, the communication path and the trunk circuit 10 are restored. For this reason, the subscriber circuit 11 connected to the trunk circuit 10 of the carrier B transmits the ON / OFF-HOOK state of the subscriber 7, so that if the subscriber 7 is OFF-HOOK, an inverted signal is transmitted to the trunk circuit 10. If 7 is ON-HOOK, a positive polarity signal is sent. The response inversion signal detection circuit 14 in the trunk circuit 10 detects this (FIG. 2 (j)), and the control circuit 18 turns on the base 3 side.
Under the condition of the / OFF-HOOK signal (FIG. 2 (k)), it is determined whether or not the trunk circuit is to be restored. Next, recall is realized as follows. Subscriber now 7
Is ON-HOOK. At this time, in the trunk circuit 10, the response inversion signal detection circuit 14 detects this. Control circuit 18
In response to this, the switch is operated to disconnect the call signal detection circuit 15 from the subscriber circuit 11 of the B operator network (first switch).
Figure (l)). The recall signal from the table 3 becomes a call signal from the subscriber circuit 11 of the operator A network. The call signal is detected by the call signal detection circuit 15 and transmitted to the control circuit 18. In response to this, the control circuit 18 turns ON-HOOK OF
Convert to F-HOOK signal. Subscriber circuit of B carrier network 11
Detects ON-OFF of the loop and sends a calling signal to the calling subscriber 7. When the subscriber 7 answers, a call can be made again between the subscriber 7 and the operator of the table 3 on the communication path. As described above, the embodiment of the present invention has been described with respect to the case where the connection between the subscriber terminals is performed via the trunk circuit according to the present invention, but the exchange on the side of the business having no police fire stand is connected to the subscriber terminal. Needless to say, the same service can be performed by replacing the trunk circuit. [Effects of the Invention] According to the present invention, it is possible to realize a local network service between operators by simple means. Especially the police,
It is easy to realize socially essential functions such as fire fighting.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of the present invention, FIG. 2 is a diagram for explaining the connection operation sequence of FIG. 1, and FIG. 3 is a conventional example. 10 trunk circuit 13 loop closing / dial pulse transmission circuit 14, 17 response inversion signal detection circuit 15 ringing signal detection circuit 16 400 Hz sound detection circuit 18 control circuit

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) References JP-A-62-281588 (JP, A)                 JP-A-63-9399 (JP, A)                 JP-A-63-164790 (JP, A)

Claims (1)

(57) [Claims] In a method for interconnecting first and second telecommunications carrier networks, each having a different communication network, the first telecommunications carrier network (A) having one line and the one line are connected to each other. The second telecommunications business network, comprising: a second telecommunications business network (B) having no such circuit; and a circuit including a trunk circuit having a dial transmission function for interconnecting the telecommunications business networks. The exchange side of the local network sends a call signal when the subscriber dials, and sends an answer signal based on the OFF-HOOK information to the trunk circuit when receiving OFF-HOOK information from the trunk circuit. And a circuit for performing a call signal stop, when the exchange side of the first telecommunications carrier network receives a dial digit designating a platform from the trunk circuit,
A circuit for sending a dial tone to the trunk circuit;
A circuit for transmitting a response signal of the first telecommunications carrier network when receiving a dialed digit from the trunk circuit, the trunk circuit comprising: A call signal detection circuit for detecting a call signal, a circuit for sending a call signal to the first telecommunications carrier network when the call detection signal is detected by the detection circuit, When a dial tone is detected from the telecommunications carrier network, the dial digits are sent to the first telecommunications carrier network, and a dial for designating a table is called to call the table from the first telecommunications carrier network. A transmitting circuit and an OFF-HOO when detecting a stand response signal from the first telecommunications carrier network.
A circuit for transmitting K information to the second telecommunications carrier network; and a first and a second telecommunications system when detecting a response signal and a call signal stop transmitted from the second telecommunications carrier network. A circuit that closes the communication path of the telecommunications carrier network, and a control circuit that controls the operation of the call signal detection circuit, the call signal transmission circuit, the dial digit transmission circuit, the OFF-HOOK transmission circuit, and the communication path closing circuit. And connecting a trunk or a subscriber terminal of an exchange of the second telecommunications carrier network to be communicated to a terminating terminal of the trunk circuit, and connecting the other of the second terminal to an originating terminal of the trunk circuit. A subscriber terminal of an exchange of the first telecommunications carrier network is connected, and communication between the first and second telecommunications carrier networks is enabled by the trunk circuit. Connection method.