KR0179203B1 - Order panel device using subscriber circuit in satellite communication system - Google Patents

Abstract

The present invention relates to a counterpart device using a subscriber circuit of a satellite communication system in which a subscriber interface circuit in a subscriber board can be allocated and used for maintenance, comprising: a plurality of analog subscriber interface circuits, a plurality of digital subscriber interface circuits, An order wire port for connecting an arbitrary terminal, switching means for selectively coupling the analog subscriber interface circuit or digital subscriber interface circuit and the order wire port, and controlling the switching circuit according to a control signal from the outside to control the switching circuit. And a board control means for combining and controlling a predetermined subscriber circuit among the subscriber circuits and the order wire port.

Description

Other board device using subscriber circuit of satellite communication system

1 is an overall system configuration for explaining the outline of a general satellite communication system.

FIG. 2 is a blow configuration diagram showing the configuration of the central control station 2 in FIG.

3 is a block diagram showing the configuration of the base station 3 in FIG.

Block diagram showing the configuration of the subscriber board in FIG.

Figure 5 is a block diagram showing a rudder device using the subscriber circuit of the satellite communication system according to the first embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

41: analog signal stage 42: digital signal stage

43: order wire port 47: interface port

51,52: switching unit 53: board control unit

A1 ~ A8: Analog subscriber interface circuit

D1 ~ D4: Digital Subscriber Interface Circuit

The present invention relates to the ground equipment of a satellite communication system, and more particularly, to a platter device using a subscriber circuit of a satellite communication system that can allocate and use a subscriber interface circuit in a subscriber board for maintenance.

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.

In the above-mentioned satellite communication, there are two types of PAMA (Pre Assigfment Multiple Access) method for allocating communication channels for each subscriber according to the channel allocation method, and Demand Assigfment Multiple Access (DAMA) method for allocating communication channels according to subscriber's request. In general, in the satellite communication system for communication between subscribers, many DAMA methods are adopted in consideration of the cost and the effectiveness of the communication channel.

1 is a block diagram showing the overall system configuration of a general satellite communication system according to the DAMA method.

In Fig. 1, 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). Interface between the terminals of data terminals 13A, 13B, and facsimile 14A, 14B, such as a computer, and the like. It is a base station to provide.

In FIG. 1, 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-described configuration, the central control station 2 transmits a control message through a service channel in a normal state and then communicates the state of each base station 3 based on a response message transmitted from 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. In the case of the communicable state, the available traffic channel T of the satellite is allocated to both base stations 3A and 3B so that both base stations 3A and 3B can directly communicate with each other.

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

2 is a block diagram showing the configuration of the central control station 2 described above.

In FIG. 2, reference numeral 21 denotes an antenna for transmitting and receiving the satellite 1, an uplink signal, and a downlink signal, and 22 denotes an antenna 22 using frequency polarization characteristics. Orthogonal Mode Transducer (OMT) 23 for separating and transmitting and receiving signals transmitted and received through a low noise amplifier for low noise Low Noise Amplifier (LNA), 24 is a frequency down converter (DC) for converting a frequency signal applied through the low noise amplifier 23 into an intermediate frequency signal IF of, for example, 70 MHz, and 25 is a frequency down converter. SCPC (Single Channel Per Carrier) channel unit that demodulates, decodes and outputs the intermediate frequency signal IF applied from the converter 24.

In addition, reference numeral 26 denotes an SCPC channel unit for encoding, modulating and outputting a message output from the network controller 29 to be described later, and 27 denotes an IF signal of 70 MHz from the SCPC channel unit 26, for example, 14.0 to 14.5. Frequency Upconverter (UC) for converting into microwave at GHz to generate uplink frequency signal, 28 is High Power Amplifier (HPA) for amplifying uplink frequency signal output from this frequency upconverter (27) )to be.

And, reference numeral 29 is a polling function for checking the state of each base station 3 based on a response message transmitted from the base station 3 after transmitting a control message to each base station 3 through the SCPC channel unit 26. If there is a call request from a specific base station, the base station determines whether the other base station can communicate with each other based on the information obtained in the polling process. ) Is a network control unit that performs system control such that both base stations directly communicate with each other by allocating the "

In addition, reference numeral 30 denotes a network management system for managing the overall network of the satellite communication system by the system administrator to manage the network control unit 29.

That is, in the above configuration, when the network controller 29 generates a message for each base station and outputs the message to the SCPC channel unit 26, the SCPC channel unit 26 encodes and modulates the message, for example, 70 MHz. The intermediate frequency signal is converted into an output frequency signal, and the intermediate frequency signal is converted into an uplink frequency signal of, for example, 14 GHz by the frequency increasing converter 27. The uplink frequency signal is output through the high power amplifier 28, the quadrature mode converter 22, and the antenna 21, and then transmitted to each base station 3 through the satellite 1 in FIG. .

Meanwhile, the response message received from the base station 3 through the satellite 1 to the antenna 21, that is, the downlink frequency signal of 12.25 GHz is transmitted through the orthogonal mode converter 22 and the low noise amplifier 23 to the frequency down converter. It is applied to (24) is converted into an intermediate frequency signal of 70 MHz, then applied to the SCPC channel unit 25, demodulated and decoded is applied to the network control unit 29.

Then, the network control unit 29 controls the entire communication system by controlling the status detection, call processing, etc. of each base station based on the message information from the SCPC channel unit 25.

3 is a configuration diagram showing the configuration of the base station 3 described above, which is substantially the same configuration as the central control station 2 described above. However, the base station 2 is provided with a subscriber interface board 39 (TDC: Telephone and Data Card) for providing subscribers with data transmitted / received through the SCPC channel units 35 and 36 to talk to multiple subscribers. To provide functionality.

4 is a block diagram showing the configuration of the subscriber interface board 39. The subscriber interface board 39 includes eight analog subscriber interface circuits A1 to A8 for analog subscribers and four digital subscriber interfaces for digital subscribers. Circuits D1 to D4 are provided, and separately, an order wire circuit OR for maintenance of a base station or subscriber line is provided.

The analog subscriber interface circuits A1 to A8 and the digital subscriber interface circuits D1 to D4 are connected to the analog signal terminal 41 and the digital signal terminal 42 through the first and second switching units 45 and 46. In addition to the above, it is coupled to the above-described SCPC channel units 35 and 36 through the interface port 47.

In FIG. 4, reference numeral 44 is coupled to the network controller 40 in FIG. 3 via a bus to control the subscriber interface board 39 as a whole. In particular, the first and second switching units 45 , 46) provides a call function to each subscriber.

In addition, the order wire circuit OR is coupled to the SCPC channel units 35 and 36 through the direct interface port 47 without passing through a separate switching unit and is coupled to the order wire port 43.

Here, the order wire circuit (OR) allows a system administrator or a professional repairman to perform a call or data transmission and reception with a system administrator existing in another region or system through the call circuit, and the order wire circuit (OR) The fixed occupied line corresponds to one analog subscriber interface circuit or digital subscriber interface circuit.

Therefore, the maintenance staff can connect a predetermined terminal through the order wire port 43 and then arbitrarily make a call with another region.

However, since the order wire circuit OR occupies a constant communication channel of the satellite at all times despite its extremely low frequency of use, this is very vulnerable in terms of efficiency. In addition, since the order wire circuit OR has a circuit configuration and size that is equivalent to that of the analog subscriber interface circuit, this leads to an increase in manufacturing cost and an obstacle in reducing the size of the device.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rudder board system for a satellite communication system that can execute an order wire function using a circuit unit provided for a call function.

Another apparatus for satellite communication system according to the present invention for achieving the above object is a plurality of analog subscriber interface circuits, a plurality of digital subscriber interface circuits, order wire ports for connecting any terminal, the analog subscriber interface circuit or Switching means for selectively coupling the digital subscriber interface circuit and the order wire port, and the board for controlling the switching circuit in accordance with a control signal from the outside to combine and control the predetermined subscriber circuit and the order wire port of the subscriber circuit; Characterized in that it comprises a control means.

According to the present invention having the above-described configuration, the analog subscriber interface circuit or the digital subscriber interface circuit provided to the subscriber can be assigned and used for the order wire, thereby making it possible to efficiently utilize the system.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

5 is a block diagram showing a rudder device for a satellite communication system according to Embodiment 1 of the present invention.

In FIG. 5, eight analog subscriber interface circuits A1 to A8 and four digital subscriber interface circuits D1 to D4 are provided as in FIG.

Meanwhile, in FIG. 5, the order wire circuit is omitted, and the order wire ports for the order wire function are connected to the analog subscriber interface circuits A1 to A8 and the digital subscriber through the first and second switching units 51 and 52. It is coupled to the interface circuits D1 to D8.

On the other hand, reference numeral 53 in Fig. 5 is a board control unit for controlling the subscriber interface board, which performs a normal board control function as in the conventional board control unit, and is applied from the network control unit 40 in Fig. Switching control of the first or second switching unit 51, 52 according to the control signal is used to the predetermined analog subscriber interface circuit (A1 ~ A8) or digital subscriber interface circuit (D1 ~ D4) for the order wire port Will be allocated.

In this case, the interface circuit can be allocated in a predetermined order to an interface circuit which is not used on the basis of a specific circuit, and when the order wire function is executed, the predetermined interface circuit is allocated regardless of whether the interface circuit is used or not. You can also use

Next, the operation of the apparatus having the above-described configuration will be described with reference to FIGS. 2, 3, and 5.

First, in the normal operation state, the subscriber interface board executes the normal line switching function.

That is, the board controller 53 combines the analog subscriber interface circuits A1 to A8 and the digital subscriber interface circuits D1 to D4 with the analog signal terminals 41 through the first and second switching units 51 and 52. By controlling, a call function is provided to each subscriber.

On the other hand, when an error occurs in a base station in a specific region or a communication line managed by the base station, and a repair worker dispatches to the base station, the network control unit 29 is controlled by the network management system to the base station. The control data is sent to the effect that the specific interface circuit is used for the order wire for a predetermined time.

Then, in the base station of FIG. 3, the network controller 40 receives the message and transmits the data to the board controller 44 of the subscriber interface board. The board controller 44 assigns a specific subscriber interface circuit for the order wire by switching the first or second switch 45 or 46 based on the message.

Therefore, in the above state, when the maintenance personnel couples the predetermined terminal to the order wire port 43, the allocated subscriber interface circuit is fixedly connected to thereby secure the call channel.

That is, according to the above embodiment, the order wire function can be realized without any particular difficulty without providing a specific subscriber interface circuit for the order wire.

In addition, since the normal subscriber interface circuit is used for the order wire function, the use efficiency of the device can be increased.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical scope of the present invention.

As described above, according to the present invention, it is possible to realize the other board device for the satellite communication system which can execute the order wire function by using the circuit portion provided for the call function.

Claims (1)

A plurality of analog subscriber interface circuits, a plurality of digital subscriber interface circuits, order wire ports for connecting any terminal, switching means for selectively coupling the analog subscriber interface circuits or digital subscriber interface circuits and the order wire ports; And a board control means for controlling the switching circuit in accordance with a control signal from an external device and combining and controlling a predetermined subscriber circuit among the subscriber circuits and the order wire port. Batting device.