JPS58107765A - Digital terminal accommodation system - Google Patents

Abstract

PURPOSE:To display connecting state to a terminal, by providing a means detecting and discriminating audible signal generated at a digital tone generator for subscriber circuits of a digital converter, and transmitting a code in response to the result of discrimination to a digital terminal. CONSTITUTION:When a digital terminal 5 makes a call, a digital tone generator DTG1 of an outgoing register trunk and a digital subscriber circuit 11 are connected through a digital switch network 2, and an audible sound signal being a connecting state display signal from the generator DTG1 is transferred to the subscriber circuit as the repetition of digital pattern information. A digital tone pattern detector 12 in the circuit 11 detects and discriminates that the input signal is a dial tone with the pattern matching method and generates the specific code corresponding to the dial tone. This code is transferred to the terminal 5 via a subscriber line 7 to display that the outgoing trunk is assured with the print means at the terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for accommodating digital terminals in a digital telephone exchange.

When accommodating digital terminal equipment in a telephone exchange, the problem is how to make the digital terminal equipment detect and identify a connection status display signal expressed as an audible sound signal in the telephone.

Conventionally, when a new digital terminal device is installed in a digital telephone exchange that generates an audible signal indicating the connection status using a digital tone generator, the configuration is as follows. , some kind of ingenuity is required for identification.

First, for the general telephone set (installation) 4 shown in FIG. After passing through the network (D8WN) 2, it is converted into an analog signal by a decoder (DEC) 3 and transferred to the device 4, where it is detected and identified as an audible connection status display signal. On the other hand, for digital terminal (D'!”) 5, DT5
directly f! depending on the connection status. A code generator (CG) 6 that generates a code in a format that can be woven is prepared, and the output of this CG 6 is sent to the DSWN 2 and the digital subscriber@(
The connection status is detected by transferring the data to DT5 via DSL7.

I am being identified. However, when the connection status display signal is detected in this way, l#! In a separate configuration, it is necessary to classify multiple types of subscriber terminals in advance, and it is also necessary to use different procedures for sending connection status display signals depending on the class of subscriber terminals, and call processing software The prerequisite is to make changes and additions to a certain degree. This has the disadvantage of increased design costs, especially when the number of digital terminal subscribers is small.

There is also a configuration for accommodating digital terminals as shown in FIG. Here, TFL4 is the same as the configuration described in FIG. 1 mentioned above. On the other hand, regarding DT5,
The digital pattern of the audible sound signal indicating the connection status created by the TGI is converted to analog via the DSWN2 and DEC3, and then the analog audible sound signal is detected through the DSL7 and the attached analog subscriber@(ASL)9. However, in this configuration, there is no need to classify the accommodation of subscriber terminals on the call processing software 9, DS for calls to TJT5
In addition to the L7, the 0ASL9 for transmitting audible sound signals and the DEC3 associated therewith are required, which inevitably increases equipment costs.

An object of the present invention is to detect this audible tone signal in the form of a digital signal in a subscriber circuit of a digital telephone exchange in which an audible tone signal indicating the connection status is generated by a digital tone generator. By providing a means for separating and a means for transmitting a code in a format that can be directly recognized by the digital terminal according to the identification result, and accommodating the digital terminal through this subscriber circuit, it is possible to achieve a simple configuration and exchange processing software. The purpose is to provide a digital terminal accommodating method that does not require any changes.

The digital terminal accommodating method according to the present invention is such that, in a digital telephone exchange that uses a digital tone generator to generate an audible signal indicating the connection state between terminal devices accommodated in a communication path network, the audible signal is converted into a digital signal format. The digital terminal equipment is accommodated in the communication path network via a subscriber circuit that has a function of identifying the digital terminal equipment and transmitting a code in a format that can be directly recognized by the digital terminal equipment according to the identification result. - Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram showing an embodiment of the digital terminal accommodating system according to the present invention. In this embodiment, a digital tone generator (DTG) for the general telephone set 4 is used.
) The audible sound signal indicating the connection state created in step 1 passes through the digital switch network (D8WN) 2, is converted into an analog signal by the decoder (DEC) 3 and is transferred, and is detected as an audible sound by TgL4. be identified. On the other hand, when the connection status is displayed on the digital terminal (DT) 5, it is as follows. Now, as an example, PCM24
CH/J-1aw (/J=255) OP 350) 1z/440Hz in CM exchange, signal output -11
,0dBm dial tone. When a call from DT5 is detected and a calling starter trunk (not shown) is secured, D'I'G1 and digital subscriber circuit (DLC) 11 are connected via D8WN2. be done.

At this time, the audible sound signal of the connection status il1 display signal output from I) TGI is, for example, a repetition of the digital pattern information (hexadecimal display) shown in FIG. 4, but this repetition pattern is transferred to DLCll through D8WN2. The digital tone pattern detector (DTPD) 12/d built into the 0DLCI 1 detects and identifies that the input No. 4g pattern is a dial tone using a pattern matching method, and responds to the dial tone. Generate a specific code. This specific code is transferred to the DT 5 through the digital joining welding (DSL) 7.

L) Upon reception of this specific code, T5 indicates, for example, by printing means, that a calling register trunk has been secured.With such a configuration, even if the subscriber terminal is a telephone with analog signal format, digital Even when the device is a signal type terminal device, a digital tone generation source can be used as the source of the audible sound signal indicating the connection status, and there is no need to distinguish between the terminal devices in the exchange processing software. Therefore, digital terminal equipment can be accommodated in the digital telephone exchange without changing the software, and an increase in installation costs can be avoided, especially when it is desired to newly accommodate a small number of digital terminal equipment. Further, the subscriber line connecting the terminal equipment and the digital switch network only needs to be one used for telephone calls, and the analog subscriber line IiI! is used for transmitting audible signals. It is not necessary to install them in parallel.

As described above, the present invention enables the accommodation of digital terminals in a digital telephone exchange in which an audible tone signal indicating the connection status is generated by a digital tone generator without requiring redundant subscriber lines and decoders. This can be done without changing the processing software.

[Brief explanation of the drawing]

Fig. jg1 and Fig. WJ2 are block diagrams showing an example of a conventional digital terminal accommodation system, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is a block diagram showing an example of a conventional digital terminal accommodating system. This shows the pattern information of the digital tone. 1...Digital tone generator, 2...-
・Digital switch network, 3... Decoder, 4... General telephone, 5... Digital terminal, 7... Digital subscriber line, 11
...Digital subscriber circuit, 12...
Digital To-7 pattern detector. No. 1 No. Z Fig. 3 Ward No. 4 ■ 52 ■ 55 C5 ■ I) D C2 De

Claims (1)

[Claims] In a digital telephone exchange that uses a digital tone generator to generate an audible tone signal indicating the connection status between terminal devices accommodated in a communication path network, the audible tone signal is identified in a digital signal format, and the digital terminal device is directly A digital terminal accommodating system, characterized in that the digital terminal equipment is accommodated in the communication path network via a subscriber circuit having a function of transmitting a recognizable code according to the identification result.