JPS6014595A - Dc signal relaying system of digital network - Google Patents

Abstract

PURPOSE:To reduce amount of software processing by converting row of dial pulses to specified pattern, sending it out to an outgoing trunk through a digital network and relaying by hardware to reproduce to original dial pulse by the outgoing trunk. CONSTITUTION:When a subscriber's circuit 1 receives dial pulse corresponding to a telephone number, for instance ''123-4567'', an outgoing trunk corresponding to office number ''123'' is selected by a central processing unit 4. Accordingly, what is necessary for selected outgoing trunk is only ''4567'', and it is unnecessary part for call processing by software. Accordingly, this is sent out to a relevant outgoing trunk as a DC signal through a network 2. Such a DC signal is transmitted to specified pattern is inputted to a pulse row detecting circuit 32 through the network 2 and becomes output corresponding to the specified pattern, and a relay A operates to open and close a contact (a). Thus, telephone number ''4567'' is reproduced in an outgoing trunk 3 and sent out to a junction line.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a system for relaying DC signals in a digital exchange by hardware.

Prior Art and Problems In general, in a digital switching network in which subscriber circuits and outgoing trunks are connected by a digital network, this digital network uses digital coding (for example, PC
Only AC signals represented by M-encoded audio signals are transferred.

Therefore, in conventional space-division networks, DC signals such as dial pulses from subscribers and dial pulses between trunks, which were relayed by the network itself, were relayed by software in conventional digital networks. There was a problem that the amount of processing increased.

Purpose of the Invention The purpose of the present invention is to convert the dial pulse train into a specific pattern and send it to the outgoing trunk via the digital network, focusing on the fact that there is generally no need for audio signals to pass through the network while receiving dial pulses. The purpose is to reduce the amount of software processing by using hardware to reproduce the original dial pulse on the outgoing trunk.

Structure of the Invention According to the present invention, a predetermined DC signal from one of devices interconnected via a digital network is converted into a specific pattern, and the converted specific pattern is digitally encoded as an AC signal. A DC signal relay system for a digital network is provided, which is characterized in that the DC signal is transmitted to the network by being incorporated into a train, and the other device detects the specific pattern and reproduces the DC signal.

Embodiments of the Invention The present invention will now be described by way of embodiments with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of an apparatus for implementing the relay system of the present invention. In the apparatus shown in FIG. 1, a subscriber circuit 1 and an outgoing trunk 3 are interconnected via a digital network 2.

Further, reference numeral 4 is a central processing unit. The subscriber circuit 1 is connected to the telephone interface circuit 11, and the outgoing trunk 3 is connected to the telephone interface circuit 11.
are the inter-station interface circuit 31 and the pulse train detection circuit 3
2 and relay A, respectively.

According to the present invention, when a dial pulse train is received by the subscriber circuit 1, data of four PCM times is sent to the network 2 as a certain specific pattern, e.g. The system detects a pattern of 1, reproduces it as a dial pulse, and sends it to the trunk line.

This takes advantage of the fact that a part of the dial pulse is not necessary for software processing and can be sent out as a DC signal via the network 2. For example, when subscriber circuit 1 receives a dial pulse corresponding to telephone number 123-4567, central processing unit 4 selects the outgoing trunk corresponding to station number 123. Therefore, what is needed for this selected outgoing trunk is not all 123-4567, but only 4567, and since this is still an unnecessary part for call processing by software, this is sent as a DC signal via network 2. \outgoing trunk, the software does not need to relay this 4-digit number, which reduces the amount of processing.

Next, in order to transmit such a DC signal in a digital pattern in the network 2, the fact that there is no need to pass the audio signal while receiving the signal pulse is utilized.

The telephone interface circuit 11 outputs 1 when the loop is broken.
When a loop detection signal (FIG. 2 (1)) that becomes 0 when the call is in progress, that is, when the loop is closed, is output to the central processing unit 4 and the Nantes gate 12, the data in the digital network 2 is transmitted as shown in FIG. 2 ((1)). 2). In FIG. 2 (2), ■ is an audio signal, for example, a PCM code, and 1 is aul data. The signal converted into a specific node in this way is sent to the node string detection circuit 32 via the network 2.
When the output shown in FIG. 2 (3) corresponding to the specific pattern is input, relay A operates to open and close contact a (FIG. 3 (4)).

As a result, the dial number string that has been digitally encoded and transmitted through the network 2, ie, the telephone number 4567 in the previous example, is reproduced on the outgoing trunk 3 and sent to the trunk line. In this embodiment, the specific pattern is described as pattern 1, but the present invention can be practiced with other patterns as well.

Effects of the Invention According to the present invention, the dial clock string is sent from the subscriber circuit 1 to the outgoing trunk 3 via nodeware rather than through software processing as in the conventional case. The amount of processing is reduced, and the amount of software processing as a whole is reduced.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an apparatus for implementing the DC signal relay system according to the present invention, and FIG. 2 is a waveform diagram of each part of FIG. 1. DESCRIPTION OF SYMBOLS 1... Subscriber circuit, 2... Digital network, 3... Outgoing trunk, 4... Central processing unit, 11...
...Telephone interface circuit, 12... Nantes gate, 31... Interoffice interface circuit, 32...
・/(Russ train detection circuit.

Claims (1)

[Claims] A predetermined DC signal from one of the devices interconnected via a digital network is converted into a specific pattern, and the converted specific pattern is incorporated into a digitally coded string of the AC signal to be transmitted to the network. 1. A DC signal relay system for a digital network, characterized in that the DC signal is transmitted and the other device detects the specific pattern and reproduces the DC signal.