KR940006745B1 - Digital switching system - Google Patents

Abstract

a subscriber circuit having a subscriber controller for transmitting and receiving a control signal, and a subscriber exchange for transmitting and receiving audio PCM (pulse code modulation) or information communication data; a central control circuit having a central controller for exchanging a control signal with the subscriber controller, and a central exchange for transmitting and receiving the audio PCM or information communication data; and a composite signal multiplex line for transmitting a system control signal, an ISDN signalling signal, the audio PCM data and the information communication data between the subscriber circuit and the central control circuit, thereby suppressing an occurrence of an electromagnetic wave.

Description

Digital Easy Exchange System

1 is a block diagram of a conventional digital simple switching system.

2 is a block diagram of a digital simplified exchange system according to the present invention.

3 is a block diagram of a composite signal multiplexing line used in the digital simplified switching system of FIG.

* Explanation of symbols for the main parts of the drawings

10: central control unit 20: central exchange unit

30: subscriber circuit unit 32: subscriber control unit

34: subscriber switching unit 40: control signal multiplexing line

50: switched signal multiplex line 80: mixed signal multiplex line

The present invention relates to a digital simple switching system for providing call reception and data communication between trunk lines or extension subscribers. Particularly, the control signal and data signal exchange are implemented as a single line capable of complex signal transmission. The present invention relates to a digital simplified exchange system in which the unit is integrated to increase the efficiency of the system and reduce the size thereof.

In general, the digital simplified switching system is a family of switching systems using a new technology, and serves as a digital circuit switching for voice and data transmission. Digital simplified switching system uses PCM (Pulse Code Modulation) and TDM (Time Division Multiplexing) through the switching network. In this system, the direct exchange of PCM signals used in the transmission system without converting them into analog form is required. It is possible.

A block diagram of such a conventional digital simple exchange system is shown in FIG. The digital simplified exchange system exchanges voice signals and data signals with control units 10 and 32 that receive and process control signals such as call initiation, call termination and dialing signals input to a terminal (not shown) through a subscriber line. The state consists of exchange sections 20 and 34. The controller controls the subscriber control unit 32 to receive the control signal transmitted from the terminal through the subscriber line and the control signal transmitted from the subscriber control unit 32 to process the control signal necessary for the system operation again. It is divided into a central control unit 10 for supplying to 32, and the subscriber control unit 32 and the central control unit 10 is connected by a control signal multiplexing line 40. In addition, the switching unit is divided into a subscriber switching unit 34 under the control of the subscriber control unit 32 and a central switching unit 20 under the control of the central control unit 10, the subscriber switching unit 34 ) And the central switching unit 20 are connected by a switching signal multiplexing line 50 for exchanging voice signals and data signals.

The operation of the conventional digital simple exchange system having such a configuration is as follows. Subscriber control unit 32 receives control signals such as call start, call termination and dialing signals input from the trunk line or extension terminal and sends them to central control unit 10 through control signal multiplexing line 40. The central control unit 10 receives and analyzes the transmitted control signal and then supplies the control signal necessary for the system operation to the central switching unit 20 and the subscriber control unit 32 through the control signal multiplexing line 50. Then, the central exchanger 20 exchanges voice and data signals with the subscriber exchanger 34 through the exchange signal multiplexing line according to a control signal supplied from the central controller 10. In addition, the subscriber exchange unit 34 exchanges a voice signal and a data signal through the switch signal multiplexing line 50 under the control of the subscriber control unit 32, and transmits and receives a data signal with the subscriber terminal through the subscriber line.

As such, the conventional simplified digital switching system separates the multiplexed line for transmitting the control signal and the multiplexed line for transmitting the data signal, thereby increasing the number of lines in the back plane of the exchange system, thereby increasing the circuit board of the system. The larger the size, the larger the connector for the line connection, and the higher the occurrence of electromagnetic waves. In addition, there is a problem that the efficiency of the system is lowered because the control unit and the exchange unit is operated separately.

Accordingly, the present invention is a digital simple switching system for providing call connection and data communication between trunk lines or extension subscribers, and implements the exchange of control signals and data signals as a single line capable of complex signal transmission and exchanges with a control unit. It is an object of the present invention to provide a digital simple exchange system in which the unit is integrated to increase the efficiency of the system and reduce its size.

In order to achieve the above object, the present invention is a digital simple switching system for providing a call connection and data communication between a CO line or a station subscriber, the subscriber control unit for transmitting and receiving a control signal and a subscriber to transmit and receive voice PCM or information communication data A central control circuit section comprising a subscriber circuit section including a switching section, a central control section for exchanging control signals with the subscriber control section, and a central exchange section for exchanging voice PCM or information communication data with the pressure paper exchange section, and the subscriber circuit section and the central control circuit section. And a complex signal multiplexing line composed of a plurality of channels for complex transmission of system control signals, ISDN signaling signals, voice PCM data, and information and communication data.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a digital simplified switching system according to the present invention, and FIG. 3 is a block diagram of a composite signal multiplexing line used in the digital simplified switching system of FIG. As shown in FIG. 2, the digital simplified switching system according to the present invention includes a central control circuit unit 60 composed of a central control unit 62 and a central exchange unit 64, a subscriber control unit 72 and a subscriber exchange unit ( A main line or internal subscriber circuit section 70 composed of 74 and a composite signal multiplexing line 80 connecting the central control circuit section 60 and the subscriber circuit section 70 are provided. The bit rate of the composite signal multiplexing line is 4.096 MHz, the configuration of which is shown in FIG. As shown, one frame consists of eight sub-frames.

One sub frame is composed of a plurality of channels having a transmission rate of 64 KB or 16 KB, and has one channel of high-level data link channel (HDLC) having a transmission rate of 64 KB and a 64 KB transmission rate. Like one channel for ISDN (Integrated Services Digital Network) signaling, it has a 64KB transmission rate and consists of six channels for exchanging voice PCM or telecommunication data. One channel for ISDN signaling is composed of three ISDN D-channels having a full speed of 16 KB and one channel for maintenance of a composite signal multiplexing line. Accordingly, one frame of the composite signal multiplexing line includes 8 HDLC channels for transmitting control signals, 24 D-channels for ISDN signaling, 8 channels for maintaining the line, and voice PCM or telecommunication data. It consists of 48 channels to exchange. Control signals and data exchange between the subscriber circuit unit 70 and the central control circuit unit 60 through the composite signal multiplexing line 80 having such a configuration are performed as follows. When a control signal such as a call initiation, call termination and dialing signal is supplied from a CO line or an extension terminal (not shown) to the subscriber control unit 72 of the CO line or extension subscriber circuit unit 70, the subscriber control unit 72 displays the subscriber control unit 72. The control signal is transmitted to the central controller 62 through the HDLC of the composite signal multiplexing line 80. The central control unit 62 of the central control circuit unit 60 receives and analyzes the control signal transmitted from the subscriber control unit 72 and transmits the control signal necessary for the system operation to the subscriber control unit 72 again through HDLC.

At the same time, the central control unit 62 controls the central switching unit 64 to exchange voice PCM or information communication data with the subscriber switching unit 74 of the subscriber circuit unit 70. The central switching unit 64 transmits data to the subscriber switching unit 74 through a voice PCM or an information communication data channel of a mixed signal multiplexing line under the control of the central control unit 62, and also to the subscriber switching unit 74. Receive data from On the other hand, the subscriber control unit 72 of the subscriber circuit unit 70 receives a control signal necessary for the system operation transmitted from the central control unit 72 and controls the subscriber switching unit 74 according to the control signal, thereby multiplexing the composite signal Receives data from the central switching unit 64 via the voice PCM or telecommunication data channel of the line 80 and sends it to the subscriber line or receives data from the subscriber line and exchanges the central exchange via the voice PCM or telecommunication data channel. Will be sent to the negative.

In this way, the subscriber control unit 72 and the central control unit 62 exchange control signals through the HDCL, and the subscriber switching unit 74 and the central switching unit 64 are the subscriber control unit 72 and the central control unit 62, respectively. Send and receive voice PCM or telecommunication data through voice PCM or telecommunication data channel under the control of.

As described above, the digital simple switching system according to the present invention has a complex signal multiplexing line capable of transmitting a system control signal, an ISDN signaling signal, voice PCM data, and information communication data. By reducing the number of lines in the circuit, connectors for connecting the circuit boards and lines used in the system can be miniaturized, and electromagnetic waves can be suppressed. Can be.

Claims (2)

In the digital simple switching system for providing call connection and data communication between CO lines or extension subscribers, the subscriber control unit 72 transmits and receives a control signal and the subscriber switch unit 74 transmits and receives voice PCM or information communication data. Subscriber circuitry 70; A central control circuit unit 60 including a central control unit 62 for exchanging control signals with the subscriber control unit 72, and a central exchange unit 64 for exchanging voice PCM or information communication data with the subscriber exchange unit 74; ; The subscriber circuit unit 70 and the central control circuit unit 60 between the multiple signal multiplexing line 80 composed of a plurality of channels for complex transmission of system control signals, ISDN signaling signals, voice PCM data and information communication The digital simple exchange system characterized by the above-mentioned. 2. The system of claim 1, wherein one frame of the composite signal multiplexing line comprises: eight HDLC channels for transmitting a control signal; 24 D-channels for ISDN signaling; Eight channels for maintenance of the track; A digital simplified exchange system comprising 48 channels for exchanging voice PCM or telecommunication data.