KR100330868B1 - Apparatus of Multiplying and Demultiplying Highway in the Switching System - Google Patents

Abstract

The present invention relates to a highway multiplexing and demultiplexing apparatus in an exchange system, and more particularly, to exchange and convert multiple 2M highways and 8M highways into multiplexing and demultiplexing in a PBX (Private Branch Exchange) system. The present invention relates to a highway multiplexing and demultiplexing device in a system.

The present invention provides a timing and address control unit for performing timing control and address control of highway multiplexing and demultiplexing by receiving a clock signal; A multiplexer which multiplexes 2M highways applied from subscribers of the switching system according to timing and address control of the timing and address control unit and outputs the multiplexed 2M highways to the switching unit of the switching system via the 8M highway; And a demultiplexer for demultiplexing the 8M highway applied from the switching unit according to the timing and address control of the timing and address controller and outputting the demultiplexer to the subscriber unit via the 2M highway.

Description

Highway multiplexing and demultiplexing device in an exchange system {Apparatus of Multiplying and Demultiplying Highway in the Switching System}

The present invention relates to a highway multiplexing and demultiplexing apparatus in an exchange system, and more particularly, to a multiplexing and demultiplexing apparatus in a switching system in which a conversion between a 2M highway and an 8M highway is separated into multiplexing and demultiplexing in a PBX system. .

A typical 2M highway encodes voice data at 64 (Kbps) in a PBX system, and multiplexes 32 encoded coded data by TDM (Time Division Multiplexing) to serial data at 2.048 (Mbps). To convert to form. When four of the 2M highways are multiplexed by the TDM scheme, the 2M highways have a serial data format of 8.192 (Mbps), which is called an 8M highway.

Here, the 2M highway is used in most functional blocks of the PBX system, and the 8M highway is used for a function such as switching over 512 × 512.

Then, as shown in the configuration of the multiplexing and demultiplexing apparatus in the conventional PBX system, as shown in FIG. 1, the subscriber unit 10 using the 2M highway and the serial data of the 2M highway are largely connected to the 8M highway. A highway converter 20 converts data into serial data of 8M highway into serial data of 2M highway, and a switching unit 30 using 8M highway in consideration of switching capacity and speed.

The subscriber unit 10 includes an A / D converter 11 for converting an analog subscriber signal into a digital signal and applying the same to the highway converter 20, and the highway converter 20. And a D / A converter 12 for converting a digital signal applied from the analog signal into an analog signal and applying the same to an analog subscriber. At this time, the digital signal transmitted and received between the subscriber unit 10 and the highway converter 20 is serial data of 2M highway.

The highway converting unit 20 is applied from the subscriber unit 10 under the control of the control unit 21 for controlling the conversion operation between the serial data of the 2M highway and the serial data of the 8M highway, and the control unit 21. Converts serial data of 2M highway into serial data of 8M highway and applies it to the switching unit 30 and converts serial data of 8M highway applied from the switching unit 30 to serial data of 2M highway And a switching chip 22 applied to the magnetic part 10.

Here, the switching chip 22 uses 'PEB2045' of Siemens, for example, the configuration of which is shown in Figure 2, the microprocessor interface (Interface) to interface the switching control of the control unit 21 (Micro A processor interface 22-1, a switching information memory 22-2 for storing switching information according to switching control applied through the corresponding microprocessor interface 22-1, and an external clock. A timing controller 22-3 that receives a clock signal from the generator and controls timing of performing a serial / parallel or parallel / serial conversion operation according to timing control applied through the corresponding microprocessor interface 22-1; 2M highway serial data applied from the subscriber unit 10 or 8M highway applied from the switching unit 30 according to timing control of the timing controller 22-3. Serial to parallel converter (22-4) for converting serial data into parallel data, and applied from the serial / parallel converter (22-4) according to timing control of the timing controller (22-3). An input buffer 22-5 for storing the parallel data, and address control information of the corresponding switching information memory 22-2 and the corresponding input buffer 22-5 according to timing control of the timing controller 22-3. Voice data memory 22-6 for storing parallel data of the same, and an output buffer 22 for reading parallel data from the voice data memory 22-6 in accordance with timing control of the timing controller 22-3. -7) and the parallel data read from the output buffer 22-7 is converted into serial data of 2M highway according to the timing control of the timing controller 22-3, and is output to the subscriber unit 10 or 8M. The serial data of the highway A bottle / serial converter for outputting to the positioning unit (Parallel to Serial Converter; 22-8).

In addition, the switching unit 30 includes a switching chip 31 to switch the 8M highway serial data applied from the highway conversion unit 20 to the highway conversion unit 20.

The operation of the highway multiplexing and demultiplexing apparatus in the conventional PBX system configured as described above will be briefly described as follows.

First, the switching chip 22 provided in the highway converter 20 is initialized. The multiplexing function of converting the 2M highway applied from the subscriber unit 10 into the 8M highway and outputting it to the switching unit 30 is performed. Initialize to perform, and at the same time converts the 8M highway applied from the switching unit 30 to 2M highway to initialize the demultiplexing function to output to the subscriber unit (10).

In addition, the switching chip 22 is formed so that switching can be performed so that each channel of the 2M highway and the 8M highway corresponds to one-to-one in software.

Accordingly, the switching chip 22 is operated according to the switching control of the controller 21 provided in the highway converter 20 to perform the multiplexing and demultiplexing functions.

As described above, in the related art, the switching operation is performed in software so that each channel of the 2M highway and the 8M highway correspond one-to-one, and the operation is complicated. In addition, the timing controller performs timing of multiplexing and demultiplexing operations according to a clock signal. When the input of the clock signal becomes unstable by switching, the switching function may not be performed. In this case, it was inconvenient to reconfigure the switching chip so that switching of the channels of the 2M highway and the 8M highway can be performed in a one-to-one correspondence. .

In order to solve the problems described above, the present invention is to separate the conversion between the 2M highway and 8M highway by multiplexing and demultiplexing between the switching unit using the 8M highway and the subscriber unit using the 2M highway in the PBX system By simplifying the operation by eliminating the part that is processed by software, the switching function can be restored immediately without reconfiguring the switching chip even if the input of the clock is unstable and the input of the clock is normal again. There is a purpose.

In addition, another object of the present invention is to implement the highway multiplexing and demultiplexing function only in hardware so that the cost can be sufficiently implemented in a small space and lower cost than a conventional commercial chip.

1 is a block diagram illustrating a highway multiplexing and demultiplexing apparatus in a conventional Private Branch Exchange (PBX) system.

FIG. 2 is a block diagram illustrating a switching chip in the highway converter of FIG. 1. FIG.

FIG. 3 is a block diagram illustrating an apparatus for multiplexing and demultiplexing a highway in an exchange system according to an exemplary embodiment of the present invention. FIG.

Explanation of symbols on the main parts of the drawings

40: Timing and Address Controller

50: Multiplexer

60: demultiplexer

51, 61: input buffer

52, 62: Voice Data Memory

53, 63: Output Buffer

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

In the switching system according to the embodiment of the present invention, the multiplexing and demultiplexing apparatus of the highway is implemented only in hardware, for example, a PLD (Programmable Logic Device) and SRAM (Static Random Access Memory) are implemented using a conventional commercial chip. It is possible to implement a sufficiently low cost and a small space, as shown in Figure 3, it comprises a timing and address control unit 40, a multiplexer 50, and a demultiplexer 60.

The timing and address controller 40 receives a clock signal from an external clock generator to control the timing of the highway multiplexing operation of the multiplexer 50 and the highway demultiplexing operation of the demultiplexer 60. An address signal is generated and applied to the multiplexer 50 or the demultiplexer 60 to perform an address control operation.

The multiplexer 50 receives 2M highway serial voice data from a subscriber using 2M highway, and the 2M highway serial voice data is applied according to the timing control and the address control of the timing and address control unit 40. It multiplexes and converts 8M highway serial voice data to the switching unit using 8M highway.

In addition, the multiplexer 50 includes a first input buffer 51, a first audio data memory 52, and a first output buffer 53. Here, the first input buffer 51 temporarily stores 2M highway serial voice data applied from the subscriber unit according to the timing control of the timing and address control unit 40, and then stores the first voice data memory 52. Record on The first voice data memory 52 stores and outputs 2M highway serial voice data applied from the first input buffer 51 according to the timing control and the address control of the timing and address controller 40. The first output buffer 53 temporarily stores the voice data output from the first voice data memory 52 according to the timing control of the timing and address control unit 40 and converts the voice data into 8M highway type serial voice data. Output to the switching unit.

The demultiplexer 60 receives 8M highway serial voice data from the switching unit, and demultiplexes the corresponding 8M highway serial voice data according to timing control and address control of the timing and address control unit 40. It converts 2M highway serial voice data and outputs it to the subscriber unit.

In addition, the demultiplexer 60 includes a second input buffer 61, a second audio data memory 62, and a second output buffer 63. The second input buffer 61 temporarily stores the 8M highway serial voice data applied from the switching unit according to the timing control of the timing and address control unit 40 and writes it to the second voice data memory 62. give. The second voice data memory 62 stores and outputs 8M highway serial voice data applied from the second input buffer 61 according to the timing control and the address control of the timing and address controller 40. The second output buffer 63 temporarily stores the voice data output from the second voice data memory 62 according to the timing control of the timing and address control unit 40 and converts the voice data into 2M highway type serial voice data. Output to the subscriber.

Referring to the operation of the highway multiplexing and demultiplexing apparatus in the switching system according to an embodiment of the present invention.

First, when 2M highway serial voice data is applied from the subscriber unit using 2M highway to the multiplexer 50 or 8M highway serial voice data is applied from the switching unit using 8M highway to the demultiplexer 60. The external clock generator applies the clock signal to the timing and address controller 40.

Accordingly, the timing and address controller 40 receives a clock signal from an external clock generator to perform timing control for the highway multiplexing operation of the multiplexer 50 and generates an address signal to generate an address signal. 50) to perform an address control operation or to perform timing control for the highway demultiplexing operation of the demultiplexer 60, and simultaneously generate an address signal and apply the address signal to the demultiplexer 60 to perform an address control operation. Perform a control action.

First, the execution of the highway multiplexing operation of the multiplexer 50 will be described as follows.

The multiplexer 50 stores the 2M highway serial voice data applied from the subscriber unit according to the timing control and the address control of the timing and address control unit 40 and multiplexes the 8M highway serial voice data to the switching unit. It will play a role.

That is, under the timing control of the timing and address control unit 40, the subscriber's 2M highway serial voice data is input to the first input buffer 51 provided in the multiplexer 50 and temporarily stored. The first audio data memory 52 provided in the multiplexer 50 records the data.

At this time, the first voice data memory 52 stores 2M highway serial voice data applied from the first input buffer 51 according to the timing control and the address control of the timing and address control unit 40.

When the first voice data memory 52 outputs the stored voice data according to the timing control and the address control of the timing and address control unit 40, the first output buffer 53 is configured to output the first voice data. The voice data output from the data memory 52 is temporarily stored and then output to the switching unit as serial voice data of 8M highway type.

Second, the performance of the highway demultiplexing operation of the demultiplexer 60 will be described below.

The demultiplexer 60 stores the 8M highway serial voice data applied from the switching unit according to the timing control and the address control of the timing and address controller 40 and demultiplexes the 2M highway serial voice data into the subscriber. It will serve as a negative output.

That is, the 8M highway serial voice data of the switching unit is input to the second input buffer 61 provided in the demultiplexer 60 and temporarily stored according to the timing control of the timing and address controller 40. The second audio data memory 62 provided in the multiplexer 60 records the data.

At this time, the second voice data memory 62 stores 8M high-speed serial voice data applied from the second input buffer 61 according to the timing control and the address control of the timing and address control unit 40.

When the second voice data memory 62 outputs the stored voice data according to the timing control and the address control of the timing and address control unit 40, the second output buffer 63 generates the second voice data. The voice data output from the data memory 62 is temporarily stored and output to the subscriber unit as 2M highway type serial voice data.

As described above, according to the present invention, even if the input of the clock is unstable and the clock input is unstable and the clock input is normalized again, the switching function can be directly restored without the need to reconfigure the switching chip. Demultiplexing can be implemented in PLD and SRAM, which is less expensive than conventional commercial chips and can be implemented in a small space.

Claims (3)

In the highway multiplexing and demultiplexing apparatus in a switching system, A timing and address controller which receives a clock signal and performs timing control and address control of highway multiplexing and demultiplexing; A first input buffer for storing 2M highway voice data of a subscriber unit according to timing control of the timing and address control unit, and a 2M highway voice applied from the first input buffer according to timing control and address control of the timing and address control unit; A first voice data memory for storing and outputting data, and temporarily storing voice data output from the first voice data memory according to timing control of the timing and address controller, and then switching to 8M highway type voice data. A multiplexing unit including a first output buffer to output to the multiplexer; A second input buffer for storing 8M highway voice data of the switching unit according to timing control of the timing and address control unit, and an 8M highway voice applied from the second input buffer according to timing control and address control of the timing and address control unit; A second voice data memory for storing and outputting data, and temporarily storing voice data output from the second voice data memory according to timing control of the timing and address controller, and then subscribing to the 2M highway type voice data. Highway multiplexing and demultiplexing apparatus in the switching system comprising a demultiplexer comprising a second output buffer for output to the self. delete delete