KR100320275B1 - Analog trunk interface device for satellite communication system - Google Patents

Abstract

The present invention relates to an analog trunk interface device for a satellite communication system that allows a satellite communication system to be coupled to an analog trunk such as a PABX private exchange. The present invention relates to a plurality of E / M interfaces for connecting to a private switching network or a PSTN network. DTMF detection means for detecting the DTMF signal and outputting the number data corresponding thereto, DTMF generating means for outputting the DTMF signal corresponding to the number data, hook detection means for detecting the hook signal, and hook signal based on a predetermined control signal. Hook generating means for generating and transmitting, switching means for establishing a communication path between the E / M interface and the satellite communication system based on a predetermined control signal, a bus interface for performing an interface function with the satellite communication system, and the plurality of E / M information storage that stores information data about external network connected to E / M interface And controlling the time switching unit to switch the information data applied from the bus interface with the corresponding E / M interface based on the control data applied from the bus interface, and to control the data applied from the E / M interface to the time switching unit. It characterized in that it comprises a control means for controlling to send to the interface.

Description

Analog trunk interface device for satellite communication system

The present invention relates to a satellite communication system using satellites, and more particularly, to an analog trunk interface device for a satellite communication system that allows a satellite communication system to be coupled to an analog trunk such as a PABX private exchange.

Recently, with the rapid development of communication technology, satellite communication, which enables subscribers who are located at remote sites to make calls through satellites, has become increasingly common. Since such satellite communication does not require a separate signal line for a call, It is mainly used as a long distance communication between countries or as a communication method in a mountainous country such as Korea.

1 shows an overall system configuration of a general satellite communication system.

In the figure, reference numeral 1 is a satellite having a plurality of communication channels, 2 is a central control station for controlling the entire satellite communication system, and 3 (3A, 3B) is an exchanger (11A, 11B) or a telephone (12A, 12B). And interface functions with terminals such as data terminals 13A and 13B and facsimile 14A and 14B such as a computer, and the call function between the various terminals through data transmission / reception with the central control station 2. It provides a base station.

In the drawings, reference numeral S denotes a service channel for transmitting and receiving control data, and T denotes a traffic channel for transmitting and receiving data or voice.

In the above configuration, in the normal state, the central control station 2 transmits a control message through a service channel and then, based on a response message transmitted from the base station 3, that is, communication of the base station 3 It performs a polling function to check the available capacity or the utilization status of the communication channel. When there is a call request from a specific base station, for example, the base station 3A to a terminal having jurisdiction over the base station 3B, it is determined whether the base station 3B is in a state in which communication is possible based on the information obtained in the polling process. When the communication is possible, the two base stations 3A and 3B can directly communicate with each other through the available traffic channel T of the satellite.

Subsequently, when the communication between the base stations 3A and 3B is terminated and the call termination signal is applied through the service channel S from the base station 3A, the central control station 2 receives the call for both base stations. By executing the call termination process, the traffic channel T provided to both base stations 3A and 3B is released.

On the other hand, in the base station 3, as shown in FIG. 1, an exchange 11A or a telephone 12A, a facsimile 14A, a data terminal 13A, or the like is connected. It is coupled through a telephone interface card (Trunk Interface Port) for interworking with a telephone data card and a public switched network (PSTN) that can simultaneously access data communication subscribers.

In addition, each of these terminals is set differently according to the type of device, the signal processing or the transmission and reception method, the TDC is an analog trunk (Ear and Mouth: hereinafter referred to as E / M) on the subscriber board It is configured to implement the private exchange interface function by implementing some functions.

However, in the telephone and the private exchange, the type of signal between the base station and the corresponding terminal is set differently, so that the hardware configuration required is also different. In other words, for the telephone, the ring signal or the tone signal must be supplied according to the on / off of the hook switch or a call from another terminal, whereas in the exchange, such a signal is unnecessary, so that the ring functions to interface with the telephone. Although the signal generating means and the tone generating means are provided, the ring signal generating means or the generating means as described above is unnecessary when performing interface with the exchanger.

Accordingly, the TDC of the conventional satellite communication system implements hardware devices such as ring signal generating means and tone generating means in one board to accommodate both telephone and private switching network, and also, telephone mode and private switching network. It is configured with a switch for selectively driving the devices used according to the mode.

That is, the subscriber matching board (TDC) is set to the operation mode based on a predetermined control signal, the operation in the telephone mode is not performed in the situation set in the private switch mode.

Therefore, even in the case of performing the private exchange interface function, since the subscriber board provided with an unnecessary device such as a ring generating means is used, there is a problem of relatively increasing the manufacturing cost.

In addition, the subscriber registration board of the conventional satellite communication system is configured to accommodate the most four subscribers in one subscriber registration board, which is inefficient operation compared to the device configured to accommodate many types of subscribers There was.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to realize an analog trunk interface device for a satellite communication system that can accommodate analog trunks such as a plurality of PABX private exchanges on one board.

1 is a system schematic diagram showing a general satellite communication system.

Figure 2 is a block diagram showing the internal configuration of the analog trunk interface apparatus according to the present invention.

FIG. 3 is a flowchart for explaining the operation of a call request from an external network in the apparatus of FIG. 2; FIG.

FIG. 4 is a flowchart for explaining the operation of the call request from the internal network in the apparatus of the configuration of FIG. 2. FIG.

*** Explanation of symbols for the main parts of the drawing ***

51: E / M interface (511 to 518), 52: DTMF detection unit,

53: DTMF generating unit, 54: hook detecting unit,

55: hook generating unit, 56: time switching unit,

57: bus interface, 58: E / M information storage,

59: processor.

Analog trunk interface device for a satellite communication system according to the present invention for achieving the above object is a plurality of E / M interface for connecting to a private switching network or PSTN network, DTMF to detect the DTMF signal and output the corresponding number data Detecting means, DTMF generating means for outputting a DTMF signal corresponding to the number data, hook detecting means for detecting a hook signal, hook generating means for generating and sending a hook signal based on a predetermined control signal, and based on a predetermined control signal. Switching means for establishing a communication path between the E / M interface and the satellite communication system, a bus interface for performing an interface function with the satellite communication system, and information data about an external network connected to the plurality of E / M interfaces. The time based on the E / M information storage means stored therein and the control data applied from the bus interface. And controlling means for controlling the data to be applied from the bus interface to the corresponding E / M interface and to transmit the data to the bus interface from the E / M interface. It is done.

That is, according to the above, by implementing an analog trunk interface device that can accommodate a plurality of analog trunks for connection with analog trunks in the satellite communication system, it is possible to more efficiently perform the interface function with the external network. .

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the internal configuration of an analog trunk interface device for a satellite communication system according to an embodiment of the present invention.

In the figure, reference numeral 51 denotes an E / M interface for connecting with a private switching network or a PSTN network, which is equipped with eight E / M interfaces on one board, and each E / M interface connects with one channel, It transmits and receives 8Kbps data per channel. That is, one E / M interface is fixedly connected to a specific external network.

Reference numeral 52 denotes a DTMF detection unit for detecting a DTMF signal applied to the time switching unit 56 to be described later and outputting number data corresponding thereto, and 53 for outputting a DTMF signal corresponding to the input number data. DTMF generator 54 is a hook detector for detecting a hook signal applied from the E / M interface 51, 55 generates a hook signal based on a predetermined control signal applied from the processor 59 to be described later. It is a hook generating part which sends out to the E / M interface 51. FIG.

On the other hand, reference numeral 56 is a time switching unit for establishing a communication path between the plurality of E / M interface 51 and the bus interface, which is based on the control signal of the processor 59 to be described later The data received from the interface 51 is transmitted to the internal interface 57 which will be described later, and the data applied from the internal interface 57 is transmitted to the E / M interface 51.

In addition, reference numeral 57 denotes a bus interface that performs an interface function between the satellite communication system and the E / M interface device, which transmits / receives control data between the main PCM highway (MPH) and the processor, and the satellite communication system. It performs an interface function for transmitting and receiving information data between the UPH (Utility PCM Highway) and the time switching unit 56 of the data bus.

In addition, reference numeral 58 is an E / M information storage unit that stores information data on the external network connected to each of the E / M interfaces 511 to 518, and 59 is a processor for controlling operations of the entire apparatus. This controls the time switching unit 56 based on the control data applied from the bus interface 57 to control the switching of information data applied from the bus interface 57 with the corresponding E / M interface. The data applied to the time switching unit 56 from the / M interface 51 is controlled to be transmitted to the bus interface 57.

Next, the operation of the apparatus having the above-described configuration will be described with reference to the flowcharts shown in Figs.

Fig. 3 shows the operation of the E / M interface device when there is a call request from an arbitrary private switching network. The subscriber of the private switching network picks up the telephone and the hook signal of the calling party is connected to the corresponding E / M interface combined with the private switching network. When applied, the hook signal received by the hook detection unit 54 coupled with the E / M interface is applied to the processor 59 so that the processor 59 can identify from which E / M interface 51 the hook signal is detected. do. Here, the hook detector 54 and the hook generator 55 are coupled in series with the respective E / M interfaces 51. That is, the eight wires corresponding to the eight E / M interfaces 51 are connected to the hook detection unit 54.

That is, when a predetermined hook signal is detected from the hook detection unit 54 (ST1), the processor 59 recognizes the corresponding E / M interface of the calling party through the detected hook signal, and based on this, the corresponding E / M A predetermined control signal is applied to the time switching section 56 to establish a call path between the interface and the bus interface 57 (ST2).

Meanwhile, the time switching unit 56 switches the corresponding E / M interface based on the E / M interface information applied from the processor 59, which is coupled with the E / M interface having one channel. There are a number of terminals corresponding to the E / M interface, and the bus interface 57 accommodating 64 channels is combined with one bus to transmit data in a TDM manner.

Subsequently, the processor 59 detects the DTMF signal from the data applied from the time switching unit 56 through the DTMF detecting unit 52 and outputs the number data corresponding thereto (ST3), and the DTMF detecting unit 52 detects the DTMF signal. The number data is applied to the time switching unit 56 and transmitted to the bus interface 57, thereby performing call processing based on the DTMF signal received from the satellite communication system.

Thereafter, when the call between the calling party and the called party is terminated and predetermined call release request data is received from the calling party or the called party (ST4), the processor 59 transmits the corresponding E / M through the time switching unit 56. The predetermined control data is generated and applied to release the communication path with the interface.

On the other hand, Figure 4 is a flowchart for explaining the operation of the E / M interface device when there is a request from the subscriber to the private exchange of the internal communication system of the satellite communication system, through the UPH which is the control bus of the satellite communication system When call request control data is applied to the processor 59 (ST11), the processor 59 generates a DTMF signal corresponding to the number data from data subsequently received through the DTMF generating unit 53, and then the time switching unit 56 ) Is applied (ST12).

Subsequently, the processor 59 searches for the E / M interface 51 corresponding to the number data of the called party received through the E / M information storage unit 58 (ST13), and the corresponding E / M interface 51. A predetermined control signal is applied to the time switching unit 56 so as to switch (ST14).

In addition, the processor 59 controls to transmit the hook signal to the E / M interface of the called party through the hook generating unit 55 based on the E / M information storage unit 58 search result in step ST13 ( ST15).

Thereafter, when predetermined call cancellation request data is applied from the calling party or the called party (ST16), the processor 59 controls the time switching unit 56 to establish a connection between the corresponding E / M interface 51 and the satellite communication system. The channel is released (ST17).

That is, by installing a plurality of E / M interface devices for the PSTN connection using a private exchange or an analog trunk can be switched to form a communication path with the satellite communication system.

Therefore, by implementing an analog trunk interface device that can accommodate a plurality of analog trunks for connection with analog trunks in the satellite communication system, it is possible to more efficiently perform the interface function with the external network.

In addition, this invention is not limited to the said Example, It can variously deform and implement within the range which does not deviate from the technical summary of this invention.

As described above, according to the present invention, an analog trunk interface device capable of accommodating a plurality of analog trunks on one board for connection with an analog trunk in a satellite communication system can effectively interface with an external network. Will be able to perform

Claims (3)

Multiple E / M interfaces for connecting to a private switching network or a PSTN network, DTMF detecting means for detecting a DTMF signal and outputting number data corresponding thereto; DTMF generating means for outputting a DTMF signal corresponding to the number data; Hook detecting means for detecting a hook signal, Hook generating means for generating and sending a hook signal based on a predetermined control signal; Switching means for establishing a communication path between the E / M interface and the satellite communication system based on a predetermined control signal; A bus interface for performing an interface with a satellite communication system, E / M information storage means for storing information data for the external network connected to the plurality of E / M interface, Control the time switching unit to switch the information data applied from the bus interface with the corresponding E / M interface based on the control data applied from the bus interface, and also convert the data applied from the E / M interface to the time switching unit to the bus interface. Analog trunk interface device for a satellite communication system comprising a control means for controlling the transmission. The method of claim 1, The E / M interface is an analog trunk interface device for a satellite communication system, characterized in that one channel is assigned to a specific external network. The method of claim 1, And said hook detecting means, hook generating means, and switching means are coupled in series to said E / M interface, respectively.