JPH024055A - Private line exchange connection system - Google Patents

Abstract

PURPOSE:To dispense with a dialing by outputting call information from a network control unit device and inputting it to a digital exchange in response to a trigger signal detected from a signal received from data terminal equipment through a private line. CONSTITUTION:When a call is generated to a caller side data terminal 2, a transmission request RS signal is sent to a subscriber side modem 5, and a carrier CD signal is sent through a private line 4 to an exchange side modem 5'. When the CD signal is detected, the modem 5' sends the CD signal to a network control unit NCU 6. The NCU 6 executes the call to a PBX 8A, reads an incoming destination dial number from a built-in dial memory, and sends it to the PBX 8A. Next, it is connected through PBXs 8A and 8B and a public switching network 13 to a terminal 2' to be called. When the terminal 2' responds, the response is executed to the NCU 6 in a reverse sequence, and a call is started between a DET 2 and the 2'. Thus, the dialing is made unnecessary, a connection is executed in a short time, and a call efficiency is improved.

Description

[Detailed Description of the Invention] [Summary] Dedicated line switching connection system in which the dialing information of the dedicated line is output on the exchange side in response to a call trigger signal.It is necessary to send the dialing information from the subscriber side to the exchange side. a data line terminating device capable of outputting a detection signal of a trigger signal received from a data terminal device via a dedicated line to a digital exchange, and in response to the detection signal, A network control device capable of outputting call information to the digital exchange is provided, and the data terminal device sending out the trigger signal is configured to perform an exchange connection to the receiving data terminal device corresponding to the call information.

[Industrial application field]

The present invention relates to a leased line exchange connection system in which dial information for a leased line is output on the exchange side in response to a call trigger signal.

When communicating between terminals in a switched communication network, it is essential that the calling terminal specify the address of the called terminal. There are several methods for determining such address 1. For example, there is a system in which all or part of the address is registered in advance and the address information is used when making a call. One example is when a data terminal device is connected to an exchange via a dedicated line.

[Prior Art] A conventional method for connecting a calling data terminal device connected to a dedicated line to a specific destination terminal device is to connect a data terminal device (DTE) 2 on the subscriber side and A network control device (NC) is connected to the data circuit terminating equipment (DCE) 3.
LJ) 7 is interposed, and the data line termination device 3 is connected to the exchange side 11 via the dedicated line 4.
Under software control, the network control device 7 of the calling subscriber sends dial information for a specific called terminal set there to the called subscriber connected to the called subscriber, or to the called subscriber via the switched communication network. In-channel transmission is required.

On the exchange side 11, there are a data line termination device 3, a network control device 7, and a private branch exchange 8A.

[Problem to be solved by the invention]

In the above method, the calling subscriber network control device 7 responds to a transmission request from the data terminal device 2 and uses the specific called terminal device dialing information set therein to send a message via the data line termination devices 3, 3. Since the system is designed to transmit incoming data to the terminal device, depending on the transmission speed of the data line terminating device 3, in-channel transmission from the network control device 7 is necessary to receive dial information and have the terminal device successfully receive the dial information. It becomes necessary to change the signal speed of dial information as well. Furthermore, since it is necessary to transfer the dial information to the exchange side, a time loss occurs due to the time required for the transfer, resulting in a decrease in line usage efficiency. In addition, in this conventional system, regarding the transmission path setting for a call, etc., between the data terminal device 2 and the data line terminating device 3 on the subscriber side, and between the data line terminating device 3 and the private branch exchange 8A on the exchange side 11. It is also an essential requirement to provide network control devices 7, 7 as connection mediating means between the network and the network.

The present invention was created in view of such problems, and provides a dedicated line switching connection method that allows a call to be received at a specific receiving terminal without requiring the transmission of dial information from the subscriber side to the exchange side. Its purpose is to provide.

[Means for Solving the Problems] FIG. 1 shows a block diagram of the principle of the present invention. As shown in FIG. 1, the present invention includes a data line termination device 3 capable of outputting a detection signal of 1 to RIGA signals received from a data terminal device via a dedicated line to a digital exchange 9; A network control device 6 capable of outputting call information to the digital exchange 9 in response to the signal is provided, and the data terminal device sending out the trigger signal is exchange-connected to the incoming data terminal device corresponding to the call information. It consists of

[For production]

The call information that causes the digital exchange 9 to perform switching processing is transmitted from the network control device 6 that responded to the detection when it is detected that a trigger signal has been transmitted to the data line termination device 3 via the dedicated line. It is given to the digital exchange 9.

Therefore, there is no need to provide the call information sending function on the terminal device side. The time spent transmitting call information to the exchange is also eliminated, improving line usage efficiency.

〔Example〕

FIG. 2 shows an embodiment of the invention. In this figure, components that are the same as those shown in FIG. 1 are given the same reference numerals and their explanations will be omitted. 5 is modem (MODEM)
It is. The network control device 6 has a configuration shown in FIG. 3. In FIG. 3, 10 is a modem ink face;
2 is a control unit, 14 is a dial memory, and 16 is a PBX interface. Modem ink face 10 is CCI
It has an ink face configuration defined in TT Recommendation V, 24 100. The control unit 12 controls the dial memory 1
It controls the reading and sending of the dial information of No. 4, and controls the transmission and reception of signals between the modem interface IO and the ink face No. 2 of the PBX ink faces 16, which has the same configuration as the above-mentioned V and 24100. The dial information sent from the control unit 12 is the V of the CCITT recommendation of the PBX interface 16 as described above.

24 through the ink face 30 having an interface configuration defined by 200.

In this configuration, when a call occurs at the data terminal device 2 on the calling subscriber side, R3 is sent from the data terminal device 2 on the calling subscriber side.
A signal (transmission request signal) (100 in FIG. 3) is sent to the subscriber side modem 5. A carrier signal (102 in FIG. 3) is transmitted from the modem 5 to the exchange side 11. When the modem 5 on the exchange side that receives the gear carrier signal detects the carrier signal, it transmits the CD signal (carrier detection signal) (fourth
104) in the figure is sent to the network control device 6.

In the network control device 6, the control unit 12 that receives the CD signal via the modem ink face 10 transfers the call to the private branch exchange 8A via the ink face 30 of the PBX interface 16 (see FIG. 4). 106), a notification that the connection is in progress is sent to the data terminal device 2 on the calling subscriber side via the exchange side modem 5 and the subscriber side modem 5. This is the R from the network control device 6 to the modem 5 on the exchange side.
3 signal on/off, carrier signal on/off from exchange modem 5 to subscriber side modem 5, and CD signal on/off from subscriber side modem 5 to calling subscriber side data terminal device 2. (108, 1 in Figure 4)
10, 112).

After the network control device 6 makes a call to the private branch exchange 8A, it reads the destination terminal dial information from its dial memory 14 and sends it to the private branch exchange 8A via the ink face 30. Then, when a normal call path connection sequence is established between the private branch exchange 8A and the terminating data terminal device 2 via the private branch exchanges 8A, 8B and the public switched network 13, and the terminating data terminal device 2 responds to it,
A response is returned from the incoming data terminal device 2 to the private branch exchange 8A via the public switched network 13 and the private branch exchange 8B (118 in FIG. 4). When the private branch exchange 8A receives this response, a connection completion signal is sent to the network control device 6 (12 in Fig. 4).
0). Upon reception of the connection completion signal, the R3 signal, carrier signal, and CD signal, which had been turned on/off, are turned on (fourth time 122, 124, 126). As a result, a communication path is formed between the data terminal device 2 on the calling subscriber side and the incoming data terminal device 2, and data communication begins (
128 in Figure 4).

When the data communication ends, the R3 signal sent from the calling subscriber's data terminal device 2 is turned off, and the subscriber modem 5, which responds to the R3 signal turning off, turns off the carrier signal (the fourth 130.132 in the figure). C that was being sent from modem 5 on the exchange side when the carrier signal was turned off.
The D signal also switches off (134 in Figure 4). In response to this transition of the CD signal to OFF, the network control device 6 sends a disconnection signal to the private branch exchange 8A (136 in FIG. 4).
). That campus traffic 1#! The terminal 8A initiates a normal disconnection sequence for the communication path established with the incoming data terminal 2 (138 in FIG. 4). Response from incoming data terminal device 2 in response (140 in FIG. 4)
When the private branch exchange a8A receives this, it begins processing to release the communication path from there to the originating data terminal device 2. It starts with sending a restoration signal from the private branch exchange 8A to the network control device 6, the network control device 6 turns off the R5 signal in response to the restoration signal, the modem 5 on the exchange side turns off the carrier signal in response to the turning off of the R3 signal, and so on. Then, the subscriber side modem 5 responds to the carrier signal being turned off by causing the CD signal to be turned off, thereby completing the communication path release process (see 144, 146 and 148 in FIG. 4).

Note that the destination of the call is changed by changing the registration of the dial information in the dial memory described above. The above-mentioned trigger signal does not necessarily need to be a carrier signal.

〔Effect of the invention〕

As described above, according to the present invention, it is only necessary to send a trigger signal for calling from the terminal side to the exchange side, which simplifies the configuration of the terminal device and increases the cost advantage. Furthermore, since the transmission time consumed by calling information is eliminated, line usage efficiency is improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a diagram showing an embodiment of the present invention, Fig. 3 is a configuration diagram of a network control device, Fig. 4 is a diagram showing a signal sequence, and Part 5 is FIG. 2 is an explanatory diagram of a conventional dedicated line switching connection system. 6.7 is a network control device (modem ink face 10, control unit 12, dial memory 14, PBX interface 1
6) and 9 are digital exchanges (private branch exchange 118A).

Claims (1)

[Claims] (1) A data line termination device (3) capable of outputting a detection signal of a trigger signal received from a data terminal device via a dedicated line to a digital exchange (9)
and a network control device (6) capable of outputting call information to the digital exchange (9) in response to the detection signal, and a network control device (6) capable of outputting call information to the digital exchange (9) in response to the detection signal; A dedicated line switching connection method characterized by switching connections to terminal equipment.