KR100227616B1 - Facsimile/voice data interface apparatus in the subscriber line board of value added communication system - Google Patents

Abstract

According to the present invention, a subscriber line board capable of simultaneous access to four channels in a supplementary communication system enables simultaneous access to eight channels so that a subscriber line board of a supplementary communication system can provide high quality voice and fax services. / Voice data interface device.

It is an object of the present invention to allow 8 channels to be simultaneously connected to one subscriber line board and to process multiple channels of fax data without loss of data in sequence, and to access the processed fax / voice data asynchronously. By providing an interface device with improved processing speed, it is possible to provide more high quality products by enabling more subscribers to access and improving service speed.

As a result, it is effective to simplify the system's high performance and size, and improve the processing speed, so that it can be applied to the design of boards of 8 channels or more in the future.

Description

Fax / Voice Data Interface Device on Subscriber Line Board of Additional Communication System

According to the present invention, a subscriber line board, which allows only four channels to be simultaneously connected in an additional communication system, allows eight channels to be simultaneously connected, thereby facilitating the provision of a high quality note and fax service in the subscriber line board of the additional communication system. / Voice data interface device.

In general, the subscriber line board of the developed additional communication system is designed to be connected to 4 channels, that is, 4 subscribers per board.

This is configured as shown in FIG.

That is, the CPU 5 recognizes the fax data coming through the PCM highway 1 and sends a synchronization signal to the fax data processing section 3 via the synchronization processing section 4.

The fax data processing unit 3 performs processing appropriately for an accumulator (not shown) and gives an interrupt INT1 to the CPU 5 to report completion of transmission.

The CPU 5 recognizes this signal and reads the data from the fax data processing section 3 and stores it in the memory 6.

Then, the data is recorded in the common memory 8 through the voice / fax data storage device connecting unit 7 by a polling method. At this time, when data recording is completed in the common memory 8, the voice / fax data storage device connecting unit 7 gives an interrupt INT2 to the CPU 5 and reports the completion of recording.

Accordingly, the CPU 5 transmits the data write completion report of the common memory 8 to the control board information exchange memory 9.

With this information, the control board reads data from the common memory 8 and stores it in the storage device.

The above description is a data recording process and the playing process is performed in the reverse order.

Here, the voice data and the fax data are mutually exclusive so that one side is in an ON state and the other side is necessarily in an OFF state.

In other words, when the voice compression unit 2 operates, the fax data processing unit 3 does not operate.

As described above, the four-channel subscriber line board is very slow because four channels per board are the maximum simultaneous receiving channels, and the fax data processing process is performed through several processes.

In addition, since the common memory 8 is accessed in a synchronous manner, access is possible only at the time of self, but not otherwise.

In addition, when the CPU 5 accesses the data of the fax data processing unit 3 and receives and processes the interrupt signal, the data is lost when the number of fax modems used (one per channel) is increased. In addition, when the speed of the modem is increased, difficulty in interrupt processing also occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to simultaneously process 8 channels to one subscriber line board and process multiple data without loss of data during fax processing of several channels. The purpose of the present invention is to provide a high-quality product by enabling the access of the fax / voice data asynchronously to provide an interface device that improves the processing speed, thereby enabling more subscriber access and improving the service speed.

In order to achieve the above object, there is provided a fax / voice data interface device in a subscriber line board of an additional communication system, comprising: a PCM highway for simultaneously transmitting and receiving PCM data, which is voice / fax data, through several channels; A voice compressor for compressing voice data received through the PCM highway; A UART which asynchronously transmits / receives the fax data received through the PCM highway and generates an interrupt when the transmission preparation to the storage device is completed; A fax data processing unit which processes the fax data received through the UART and sends the data back to the UART according to a modem speed, but is equipped with as many subscribers as possible with simultaneous service; A synchronization processor for providing a synchronization signal to output data processed by the voice compression unit and the fax data processing unit in accordance with a synchronization signal; CPU for reading the fax data stored in the UART when the interrupt occurs in the UART while controlling the synchronization processor to generate a synchronization signal for operating the voice compression unit and the fax data processor when PCM data is received through the PCM highway. Wow; A memory for storing data read from the CPU; A voice / fax data accumulator connecting unit for asynchronously connecting the data read from the CPU to the accumulator side by the CPU; A dual port RAM for recording data read from the CPU through the voice / fax data accumulator connection unit and simultaneously being read by a control board and stored in an accumulator; And a control board information exchange memory for exchanging information for data transmission and reception between the CPU and the control board.

1 is a block diagram of a fax / voice data interface device in a subscriber line board of a general supplementary communication system.

2 is a block diagram of a fax / voice data interface device in a subscriber line board of the present invention.

* Explanation of symbols for main parts of the drawings

10: PCM Highway (Pulse Coded Modulation Highway)

20: voice compression unit

30: UART (Universal Asynchronous Receiver Transmitter)

40: fax data processing unit 50: synchronization processing unit

60: CPU (Central Processing Unit) 70: Memory

80: voice / fax data storage device connection 90: Dual Port RAM

100: control board information exchange memory

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

2 is a block diagram of a fax / voice data interface device in a subscriber line board of an additional communication system of the present invention, the configuration of which includes a PCM highway 10, a voice compression unit 20, and a UART 30 (general purpose asynchronous transceiver). And a fax data processing unit 40, a synchronization processing unit 50, a CPU 60, a memory 70, a voice / fax data storage device connection unit 80, a dual port RAM 90, and control And a board information exchange memory (100).

The PCM highway 10 transmits and receives PCM data, which is voice / fax data, simultaneously through several channels. In the present invention, the PCM highway 10 includes eight channels.

The voice compressor 20 compresses the voice data received through the PCM highway 10.

The UART 30 asynchronously transmits and receives the fax data received through the PCM highway 10 to generate an interrupt INT1 when the transmission preparation to the storage device is completed.

The fax data processing unit 40 processes the fax data received through the UART 30 and sends it back to the UART 30 according to the modem speed, and is connected as many as the number of subscribers that can be processed simultaneously. That is, in the present invention, since eight subscribers can be used simultaneously, eight fax data processing units 40 are mounted.

The synchronization processor 50 provides a synchronization signal so that the data processed by the voice compression unit 20 and the fax data processor 40 are output in accordance with the synchronization signal.

When the PCM data is received through the PCM highway 10, the CPU 60 may generate a synchronization signal from the synchronization processor 50 so that the voice compression unit 20 and the fax data processor 40 may operate. When the interrupt INT1 occurs in the UART 30 while controlling, the fax data stored therein is read.

The memory 70 stores data read from the CPU 60, and does not store the fax data read during the recording operation.

The voice / fax data accumulator connecting unit 80 asynchronously connects the data read from the CPU 60 to the accumulator side by the CPU 60.

The dual port RAM 90 records the data read from the CPU 60 through the voice / fax data storage device connection unit 80 so that the dual port RAM 90 can be read by the control board and stored in the storage device. At this time, since the dual port RAM 90 can access one resource from two ports, the dual port RAM 90 can be accessed at any time. In other words, the recording operation of the voice / fax data storage device connection unit 80 and the access operation for the reading operation of the control board are simultaneously possible.

The control board information exchange memory 100 exchanges information for data transmission and reception between the CPU 60 and the control board.

Operation of the present invention having the configuration as described above is as follows.

The CPU 60 transmits a synchronization signal to the fax data processor 40 through the synchronization processor 50 so that the fax modem can receive the PCM signal received through the PCM highway 10.

The PCM data is received by the fax data processing unit 40 via the UART 30.

Then, the fax data processing unit 40 sends the fax data received by the synchronization signal of the synchronization processing unit 50 to the UART 30 according to the modem speed, and the UART 30 to the CPU 60 according to the buffer size. Report the completion of transmission by notifying interrupt (INT1).

Accordingly, the CPU 60 reads data from the UART 30 and asynchronously the dual port RAM 90 via the voice / fax data storage device connection unit 80 directly without storing the data in the memory 70. ).

Since the dual port RAM 90 can access one resource from two ports, the dual port RAM 90 can be accessed at any time unlike the method of exchanging information after writing a memory used in the related art.

Therefore, since the information exchange between the control board and the CPU 60 is not necessary, the control information exchange memory 100 is not operated in the recording operation. Instead, a constant message format should be constructed on the data itself, which may be by the designer's definition or by the given format.

The above description is the recording process, and the reproduction process proceeds in the reverse order.

As described above, according to the present invention, it is effective to simplify the system's high performance and size, and it is also applicable to the case of designing a board of 8 channels or more in the future because the processing speed is improved.

Claims (1)

A fax / voice data interface device in a subscriber line board of an additional communication system, comprising: a PCM highway for simultaneously transmitting and receiving PCM data, which is voice / fax data, through several channels; A voice compressor for compressing voice data received through the PCM highway; A UART which asynchronously transmits / receives the fax data received through the PCM highway and generates an interrupt when the transmission preparation to the storage device is completed; A fax data processing unit which processes the fax data received through the UART and sends the data back to the UART according to a modem speed, but is equipped with as many subscribers as possible with simultaneous service; A synchronization processor for providing a synchronization signal to output data processed by the voice compression unit and the fax data processing unit in accordance with a synchronization signal; CPU that reads the stored fax data when an interrupt occurs in the UART while controlling the synchronization processor to generate a synchronization signal for operating the voice compression unit and the fax data processor when PCM data is received through the PCM highway. Wow; A memory for storing data read from the CPU; A voice / fax data accumulator connecting unit for asynchronously connecting the data read from the CPU to the accumulator side by the CPU; A dual port RAM for recording data read from the CPU through the voice / fax data accumulator connection unit and simultaneously being read by a control board and stored in an accumulator; And a control board information exchange memory for exchanging information for data transmission and reception between the CPU and the control board.