KR100529280B1 - Distributed switching type line controller and digital dispatch system with the same - Google Patents

Abstract

A distributed switching circuit controller and a digital command system employing the same are provided. The circuit controller includes one or more repeater connection boards including a dedicated line interface unit for connection with a repeater, a PCM bus interface unit for connection with a PCM bus, a command station interface unit for connection with a command station, and a PCM A PCM control board having one or more command board connection boards having a PCM bus interface for connection to a bus, a PCM control signal generator for generating control signals required for the PCM bus, and a control with the PCM bus interface. Connected via the bus to control the allocation of each PCM channel, connected via the command board and the control bus to control communications with the command station, and connected through the relay access board and the control bus to control the dedicated line With a board.

Description

Distributed switching type line controller and digital command system employing it {Distributed switching type line controller and digital dispatch system with the same}

The present invention relates to a distributed switching circuit controller and a digital command system employing the same, and more particularly, a distributed switching scheme is adopted to enable communication and supervision with a wireless communication network using a command stage and to easily increase capacity. A circuit controller and a digital command system employing the same are provided.

The dispatch system is a comprehensive wireless network management system that enables the integrated management of the wireless network efficiently by organizations using large-scale wireless communication networks, such as police, fire departments, and taxi companies.

As shown in FIG. 1, the command system is connected to a repeater 400 connected to a wireless communication network to control a call connection with the wireless communication network, and is connected to the line controller 100 to a wireless communication network. It consists of a command station (200, 300) for the call and call supervision with the connected terminal. The command posts (200, 300) are installed in the situation room of each institution or center, and are installed in the general command post (200) for monitoring and managing the wireless network comprehensively, and installed in the office space of the supervisor or conductor to monitor and manage the wireless network. There is a sub-command 300 to. Meanwhile, although only one repeater 400 is shown in the drawing, a plurality of repeaters 400 are generally installed over a large area.

In the conventional command system, without the switching between the repeater and the command post, the repeater and the command post are connected in a 1: 1 manner, and the switching between the repeater and the command post is analog, and the circuit controller and the command post are also used. BACKGROUND ART Systems that are connected by an analog line, switching between the repeater and the command station are digital, and between the line controller and the command station are VoIP (Voice over IP) systems.

The 1: 1 connection method is simple in structure, but it is difficult to apply in a system using a large number of lines and command bands, and the analog system is difficult to accommodate a large capacity and deteriorates with distance. Even in a system with a constant capacity, there is an advantage that the structure is simplified, while there is a disadvantage that it is not suitable for a large capacity system. In addition, in these systems, it is possible to make a call or monitor a call with one radio channel in one command zone, but there is a disadvantage that it is difficult to make a call or monitor a call simultaneously with multiple radio channels in one command zone. .

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and an object of the present invention is to provide a digital command system that can easily increase capacity by implementing a circuit controller in a digital distributed switching method.

Another object of the present invention is to provide a digital command system capable of simultaneously monitoring a plurality of radio channels.

The circuit repeater of the present invention for achieving this purpose is to record a call with one or more of the dedicated line interface unit having a dedicated line interface unit for connection with a repeater, and a PCM bus interface unit for connection with a PCM bus. One or more commander connection boards comprising a repeater connection board including a recording device interface unit, a commander interface unit for connection to a command station, a PCM bus interface unit for connection to a PCM bus, and a PCM bus PCM control board having a PCM control signal generating unit for generating a control signal required for the control, and connected through the PCM bus interface unit and the control bus to control the allocation of each PCM channel, and connected through the command board access board and the control bus It controls the communication with the command station and is connected through the relay connection board and the control server. It is provided with a system control board for controlling.

In addition, the PCM bus interface unit receives a PCM control signal from the PCM control signal generator via the PCM bus to generate an internal clock, and receives a PCM channel assignment control signal from the system control board via the control bus, A channel controller which loads the PCM signal on the assigned channel according to an internal clock from the generator or generates a channel control signal for extracting the PCM signal from the assigned channel, and latches the PCM data from the dedicated line interface unit or the command line interface unit. A latch for outputting the output signal from the first latch to the assigned channel of the PCM bus, a second latch for latching the PCM data of the assigned channel of the PCM bus, and a second latch for An adder for adding the output of a register, the output being coupled to one input of the adder and the output of the adder being coupled to the input A third latch for latching the output of the adder, an overflow processor that receives the output of the third latch, and determines whether the overflow occurs; and an output of the third latch at an appropriate level according to the determination result of the overflow processor. An attenuator for attenuating, and a fourth latch for latching the output of the attenuator and outputting PCM data to the dedicated line interface unit or the command line interface unit. At this time, the register, the adder, and the third latch preferably have a wider number of bits than 8 bits.

delete

On the other hand, the system control board can be configured to control the channel assignment of the PCM bus interface unit through the dual port RAM mounted on each access board.

The command station is connected to the circuit controller. The connection between the command line and the circuit controller uses an ISDN interface. Other interfaces may be used.

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

2 is a block diagram showing an internal configuration of the line controller 100 of the digital command system of the present invention.

The circuit controller 100 is provided with a control bus for exchanging control signals between boards and a PCM bus for exchanging PCM data and PCM control signals for calls between boards. In some cases, a separate bus for transmitting analog audio signals may be required, but these buses are included in the PCM bus for convenience.

As a control bus, a standard bus such as a PCI bus or an ISA bus may be used, or a control bus configured separately for the system may be used. Meanwhile, another method of speech coding may be used instead of PCM, and the present invention is not limited to a specific speech coding method.

The system control board 1100 is connected to a control bus, and transmits a control signal for channel allocation signal, PTT tone (Press-To-Talk tone) transmission, and the like for call connection to each board, and an operation signal from the command zone. A control signal such as a line signal from a wireless network is received from each board. The system control board 1100 may be configured with a general microprocessor circuit, and a main board for a personal computer may be used as it is. In this case, use a control bus that is compatible with the computer motherboard, such as a PCI bus, or use a PCI bus for the system control board 1100, and use the ISA bus for the control bus. It is necessary to provide a means for the conversion of.

As shown in FIG. 3, the PCM control board 1200 includes a PCM control signal generator 1210 for generating a signal for transmitting PCM data, and a tone generator 1220 for generating various tone signals required by the system. ). Signals required for transmission of PCM data include a PCM clock for synchronizing transmission of PCM data and a PCM frame signal for distinguishing a frame of a PCM channel. The tone generator 1220 generates a tone for the repeater PTT control required by the system and is loaded on the PCM bus.

The repeater connection board 1300 is provided with a circuit for connecting the line controller 100 and the repeater, a circuit for connecting externally received audio, and a circuit for connecting to a recording apparatus as shown in FIG. In response to the control signal from the system control board 1100 through the control bus, the voice from an external device such as a repeater is loaded on the PCM bus and serves to transmit the voice signal on the PCM bus to the external device.

Data transmission and reception with the system control board 1100 through the control bus can be performed in various ways. In the example of FIG. 4, a method of using the dual port RAM 1330 is illustrated.

The PCM bus interface unit 1340 extracts PCM data from a specific channel according to control data from the system control board 1100 and outputs the data to a D / A converter 1352 or an A / D converter. PCM data from the Analog to Digital Converter 1351 is loaded on a specific channel. The internal structure of the PCM bus interface unit 1340 will be described later.

An analog audio signal from the dedicated line interface unit 1310 is input to the A / D converter 1351 through the amplifier 1341, and the A / D converter 1351 converts it into a digital signal to thereby convert the PCM bus interface unit 1340 into the A / D converter 1351. To pass on.

The D / A converter 1352 converts the digital voice signal from the PCM bus interface unit 1340 into an analog signal and transfers the digital voice signal to the dedicated line interface unit 1310 via the amplifier 1342.

The dedicated line interface unit 1310 is provided with a circuit for interfacing with a conventional two-wire or four-wire dedicated line, and exchanges a voice signal with the repeater 400 connected through the dedicated line. The dedicated line interface unit 1310 may include a switch for selecting a 2-wire or 4-wire leased line, and may allow a 2-wire or 4-wire leased line to be selected according to control from the system control board 1100. It is also desirable to be able to adjust the amplification degree to have an appropriate signal level. Meanwhile, although only one dedicated line interface unit 1310 is illustrated in FIG. 4, a plurality of dedicated line interface units 1310 may be provided on one repeater connection board 1300.

The repeater connection board 1300 also includes an external receiving audio interface 1320 for receiving audio signals from the outside. The external receiving audio interface unit 1320 receives voice from an external device such as a reception selector and transmits the audio to the dedicated line interface unit 1310 or the PCM bus interface unit 1340.

The repeater connection board 1300 also includes a recording device interface 1325 for recording a call. The audio signal from the dedicated line interface unit 1310 and the audio signal to the dedicated line interface unit 1310 are added to the recording device interface unit 1325 by the mixer 1343.

The command board connection board 1400 is a command port interface unit 1450a..1450n for interfacing with the command station, and a dual port RAM for transmitting and receiving data between the system control board 1420 and the control unit 1410 or the command station. 1420, a PCM bus interface 1440 for interfacing with the PCM bus, a dual port RAM 1430 for transmitting and receiving control data between the system control board 1100 and the PCM bus interface 1440, and a board The control unit 1410 for controlling the operation of the. In addition, the command board connection board 1400 has an internal voice signal bus for transmitting and receiving voice signals from the board, and an internal signal signal for transmitting and receiving control signals such as a clock, an IC selection signal, a write signal, a read signal, and the like. There is a control signal bus and an internal data signal bus for exchanging data in the board, so that control and communication between the components are performed. On the other hand, it is also possible to share the internal data signal bus and the internal voice signal bus.

The command station interface unit 1450a..1450n exchanges a voice signal and a control signal with the general command station 200 or the auxiliary command station 300. As the interface between the command zone and the command zone access board 1400, an ISDN interface may be used, and a commercialized interface such as an ADSL interface or a separate dedicated interface may be used.

In addition, in FIG. 5, the control unit 1410 controls only the initialization of the IC such as an ISDN interface chip used for the command line interface unit 1450a .. 1450n and the communication with the command station is directly performed by the system control board 1100. Alternatively, communication with the command station may be performed via the control unit 1410.

Next, the configuration of the PCM bus interface units 1340 and 1440 will be described with reference to FIG. 6.

One or more PCM bus interface units are mounted for each board according to the line capacities of the repeater connection board 1300 and the command board connection board 1400. In addition, although only a circuit relating to one channel is illustrated in FIG. 6, a circuit capable of accommodating multiple channels may be mounted on one PCM bus interface unit.

The clock generator 630 generates an internal clock signal required inside the PCM bus interface from the PCM control signal assigned to the PCM bus. For convenience of drawing, the connection between the internal clock and each component is omitted, but the internal clock is connected to each component so that the data flow between the components is synchronized with the internal clock.

The PCM bus interface unit receives a control signal related to setting and releasing the PCM channel from the system control board 1100 through the control bus. 4 and 5 are configured to receive control signals through the dual port RAMs 1330 and 1430 for buffering, but other types of buffering methods may be used.

The control signal from the system control board 1100 includes a signal for loading the internal voice IN to a specific PCM channel or for loading a specific PCM channel (s) to the internal voice OUT. For example, the system control board 1100 assigns a PCM OUT of a corresponding command zone to a specific PCM channel, and assigns the same PCM channel to a PCM IN of the corresponding repeater channel in order to connect a call of a specific command zone and a specific repeater channel. Send a signal to each board. Then, the PCM signal from the PCM OUT of the command stage is transferred to the PCM IN of the corresponding repeater channel, so that the voice signal is transmitted from the command stage to the repeater channel.

That is, as shown in FIG. 7, the PCM IN signal a from the specific leased line interface unit 1310 of the leased line connecting board 1300 is transmitted to a specific channel of the PCM bus, for example, by the PCM bus interface unit 1340. The PCM bus interface unit 1440 of the command line connecting board 1400 outputs the PCM data on the 12th channel to the PCM OUT terminal a ', thereby leaving the 12th channel. The voice signal is transmitted to the commander interface unit 1450. On the contrary, the PCM IN signal b from the command line interface unit 1450 is output to the PCM OUT terminal b 'of the PCM bus interface unit 1340 of the dedicated line connecting board 1300 via the reverse path. The voice signal from the interface unit 1450 is transmitted to the dedicated line interface unit 1310.

According to such a control signal, the channel controller 620 outputs a channel control signal required inside the PCM bus interface unit. That is, if PCM IN is assigned to a specific PCM channel, the control signal for outputting the PCM IN signal from the corresponding channel is output.

According to the channel control signal from the channel controller 620, the PCM IN data is latched by the latch 615 and output to the PCM data bus at a specific channel time through the buffer 617. Thus, PCM IN data is carried on the assigned PCM channel of the PCM bus. Meanwhile, in FIG. 6, the PCM bus is preferably an 8-bit parallel bus. Therefore, eight buffers 617 and 615 are required. In addition, if the PCM IN signal is a serial signal, further means for converting it in parallel is needed.

On the other hand, the latch 601 latches data of a specific PCM channel according to the channel control signal from the channel controller 620. The latched data is added up by the adder 603 with the data stored in the register 605. An output of the adder 603 is connected to the input of the register 605 so that PCM data of various channels can be summed. For example, if you want to listen to a call made by several radios at the same time, assign several PCM channels to the PCM OUT according to the command. The adder 603 then adds the register 605 to the PCM data values of the plurality of sequentially assigned PCM channels.

This process will be described with reference to FIG. 8.

PCM frame pulses are signals that distinguish temporal frames on the PCM data bus. PCM channels are classified based on PCM frame pulses. The PCM clock is a clock for synchronization of data on the PCM data bus. On the PCM data bus, data from each channel is displayed sequentially based on the PCM frame pulses. In FIG. 8, the channels A, B, C, D, E, F, ... are shown in sequence.

The latch 601 latches the PCM data of the designated channel according to the channel control signal. FIG. 8 shows an example of a case where the audio of the A channel, the C channel, and the D channel is specified to be heard at once. That is, when the corresponding channel is reached, the latch 601 outputs the data at that time.

Register 605 is initialized to zero at the beginning of each frame. Therefore, at the beginning of the frame, the output of the latch 601, that is, the value of the A channel and 0 is added to the adder 603 to output the A value. Then, this value is stored in the register 605 again, and the value of the C channel which is the output of the latch 601 and the value of the A channel which is the output of the register 605 in the next designated channel C channel is added to the adder 603. Is added. By repeating this process, at the end of the frame, the output of the adder 603 becomes the sum of all PCM values of the designated channel, that is, A + C + D. This value is input to the attenuator 611 and the overflow processor 609 by the latch 607 after the end of each frame.

On the other hand, the register 605, the adder 603, and the latch 607 have a number of bits greater than 8 bits, for example, 11 bits, in order to prevent the overflow from being generated by sequential addition in the adder 603. Preference is given to using.

The overflow processor 609 checks whether the input PCM data can be represented by 8 bits, that is, overflows, and in the case of overflow, the attenuator 611 to attenuate the level of the signal to a level that can be represented by 8 bits. ).

Therefore, 8-bit PCM data is output from the attenuator 611, and is output to the command line or repeater side by the latch 613.

With such a configuration, it is possible to simultaneously listen to calls made in a plurality of radio channels in the command zone, and to simultaneously send out voices to multiple radio channels in one command zone.

Next, with reference to FIG. 9, the structure of a command stage is demonstrated. There is a comprehensive command zone 200 and the auxiliary command zone 300 as a command, but the two are different only in the type and size of the input means and the display, the internal configuration is very similar.

The command station includes an input unit 250 for receiving a user's operation command, and a display unit 240 for displaying a state of the system, a guide for using the operation, and the like. The input unit 250 may be a type such as a keyboard of a personal computer, a type of a button of a key-phone telephone, or may be of a type such as a touch screen. As the display unit 240, a general monitor 200 may be used in the form of a computer monitor, and the auxiliary command board 300 may use a simple LED or LCD panel.

The command station also includes a command board access board interface unit 220 for connecting to the command board access board. When ISDN is used to connect to the command board access board, a conventional ISDN interface may be used, or It is also possible to configure a separate dedicated interface circuit.

The voice data from the command board connection board interface 220 is input to the audio signal processor 230, is converted into an analog signal by the audio signal processor 230, and then amplified to an appropriate level so as to use voice using a speaker or headphones. Is converted into a signal. In addition, the user's voice is converted into an analog electric signal through a microphone provided in the audio signal processor 230, and is converted into a digital signal by a codec and then transmitted to the command board access board interface 220. .

The controller 210 exchanges commands with the system control board 1100 of the circuit controller 100 through the command board access board interface 220. That is, it controls the display unit 240 and the audio signal processor 230 according to the command from the system control board 1100, and transmits a user operation command from the input unit 250 to the system control board 1100. .

The present invention has been described above with reference to some examples, but the present invention is not limited to specific embodiments, and those skilled in the art can understand that various changes and modifications can be made without departing from the spirit of the present invention. will be.

According to the present invention, since the line controller is implemented in a digital distributed switching system, the capacity can be increased by the expansion of the connection board alone.

In addition, the PCM bus interface unit provided for each connection board has the effect that each command zone can listen to the voices of all channels at the same time and send out the voices to all channels.

1 is a block diagram showing a general connection configuration of a command system.

2 is a block diagram showing an internal configuration of a line controller of the digital command system of the present invention.

3 is a block diagram showing the internal configuration of the PCM control board.

Figure 4 is a block diagram showing the internal configuration of the repeater connection board.

5 is a block diagram showing the internal configuration of the command board connection board.

6 is a block diagram showing an internal configuration of a PCM bus interface unit.

7 is a conceptual diagram illustrating a voice call connection between a repeater access board and a command board access board.

8 is a timing diagram for explaining the operation of the PCM bus interface unit.

9 is a block diagram showing the internal structure of the command stage.

Claims (10)

A repeater connection board including a dedicated line interface unit for connecting to a repeater, and a recording device interface unit for recording a call with one or more of the dedicated line interface units including a PCM bus interface unit for connecting to a PCM bus; One or more commanding board connecting boards including a commanding interface unit for connecting to the commanding unit and a PCM bus interface for connecting to the PCM bus; A PCM control board having a PCM control signal generator for generating control signals required for the PCM bus; It is connected through the PCM bus interface unit and the control bus to control the allocation of each PCM channel, and is connected through the command board access board and the control bus to control communication with the command station, and connected through the repeater access board and the control bus. Control board to control the dedicated line Line repeater having a. The method of claim 1, wherein the PCM bus interface unit A clock generator for generating an internal clock by receiving the PCM control signal from the PCM control signal generator through the PCM bus; A channel control signal for receiving a PCM channel allocation control signal from the system control board through the control bus and loading the PCM signal to the allocated channel or extracting the PCM signal from the allocated channel according to an internal clock from the clock generator. A channel controller for generating a, A first latch for latching the PCM data from the dedicated line interface unit or the command line interface unit, a buffer for outputting the output signal from the first latch to the assigned channel of the PCM bus, A second latch for latching PCM data of an allocated channel of the PCM bus, An adder for adding the output of the second latch and register, A register having an output connected to one input of the adder and an output of the adder connected to an input; A third latch for latching an output of the adder; An overflow handler that receives the output of the third latch and determines whether the overflow occurs; An attenuator for attenuating the output of the third latch to an appropriate level according to the determination result of the overflow processor, and a fourth latch for latching the output of the attenuator and outputting PCM data to the dedicated line interface unit or the command line interface unit Line repeater comprising a. The circuit repeater of claim 2, wherein the register, the adder, and the third latch have an 11-bit width. According to claim 1, wherein the repeater connection board And an external receiving audio interface unit for receiving an external audio signal and transmitting the external audio signal to a repeater or a command station. delete The method of claim 1, The internal bus of the system control board is a PCI bus, the control bus is an ISA bus, and the circuit repeater is provided with a conversion means between the PCI bus and the ISA bus between the system control board and the control bus. Line repeater. The method of claim 1, The PCM control board further comprises a tone generating unit for generating a variety of tones to output to the PCM bus. The method of claim 1, The repeater connection board and dedicated line connection board includes a dual port RAM having one port connected to the PCM bus interface and the other port connected to the control bus. And the system control board controls the channel allocation of the PCM bus interface unit through the dual port RAM. delete One or more repeater connecting boards having a dedicated line interface for connecting to a repeater and a PCM bus interface for connecting to a PCM bus, One or more command board connection boards having a command station ISDN interface for connecting to the command station and a PCM bus interface for connecting to the PCM bus; PCM control board having a PCM control signal generator for generating a control signal required for the PCM bus, and Connected through the PCM bus interface unit and the control bus to control the allocation of each PCM channel, connected through the command board access board and the control bus to control communication with the command station, connected through the repeater access board and the control server A circuit repeater including a system control board for controlling a dedicated line, ISDN interface unit for the command board access board for access to the command board access board, An audio signal processor for outputting a voice signal from the commander access board ISDN interface through a speaker, and outputting a user voice signal input through a microphone to the commander access board ISDN interface; An input unit for receiving a user's operation input, The command zone includes a display unit for displaying information related to the connection status of the system and operation of the command station. Digital command system having a.