KR960015598B1 - Isdn subscriber control method in the isdn - Google Patents

Abstract

initializing every device and a memory in a subscriber board; receiving the data related with call process and maintenance from a common memory(CM); performing a maintenance function; transmitting the data related with call process received from a terminal to the CM; transmitting the result data related with maintenance to the CM; performing the function related with CRC(Cylic Redundancy Check); controlling the input/output of the terminal; performing an interrupt operation; and performing the timer operation for flag setting for performing the CRC operation.

Description

Subscriber Control Method of Integrated Telecommunication Network in Electronic Switching System

1 is a block diagram of a device to which the present invention is applied,

2 is a flowchart illustrating a subscriber control method according to the present invention;

3 is a detailed flowchart of FIG.

The present invention relates to a method for controlling an integrated subscriber station (ISDN) subscriber of an electronic switching system.

In the existing analog subscriber, only voice information could be transmitted. However, as communication services are diversified, data transmission is also required. There is a need for subscriber control in an ISDN exchange that has emerged as a solution to the simultaneous transmission of voice and data.

The present invention devised to meet the above requirements is to perform the call processing related functions and maintenance functions of the subscriber line using a microchip (MCU) as a firmware to control the subscriber board (firmware) In addition, the purpose of the present invention is to provide a subscriber control method for an integrated telecommunication network of an all-electronics exchange that provides a service for improving subscriber performance by interworking with a test apparatus for performing basic functions of ISDN subscriber and reliability of subscriber line.

The present invention to achieve the above object, the first step of initializing the various elements and memory in the subscriber board; A second step of receiving call processing-related data and maintenance-related data from a common memory (CM; Commom Memory) which is a data transmission / reception area with an upper board IDPA (ISDN D-Channel Processing Board Assembly); Performing a maintenance related function of receiving and receiving the received call processing related data from the terminal; Transmitting a call processing related data received from the terminal to the CM; A fifth step of transmitting the maintenance related result data to the CM; A sixth step of performing a CRC (Cyclic Redundancy Check) related function; A seventh step of controlling input and output of the terminal; An eighth step of performing an interrupt operation for controlling activation and deactivation of a terminal, reception, control of a function of directly transmitting and receiving D-channel information with a terminal, and a maintenance related function; And a ninth step of performing a timer operation for setting a flag for performing a CRC and a normal operation of the subscriber board.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

FIG. 1 is a block diagram of a device to which the present invention is applied. As shown in the drawing, the configuration of the device to which the present invention is applied is controllable for 8 lines, and the B channel data received from each line is converted into a line interface. Channel including an IEC (ISDN Echocancellation Circuit) to receive subscriber control data and voice information (il-n; n is 1 to 8), EPIC acting as a switch receiving the voice data and line control data through the IEC (Extend PCM Interface Controller) (3), a phase locked loop (PLL) (2) connected to the IEC, the EPIC (3) and the PLL (2) connected to an external TSU (Time Switch Unit) TSU interface unit 4, D-channel data is input via the IEC and is connected to the EPIC (ISDN D Channel Exchange Controller (IDEC) 5, the CPU 10 is connected to the IDEC (5), Connected to the CPU 10 and connected to an external RS232 interface. Multi-Function Peripheral (MFP) 11, a clock reset unit 6 connected to the CPU 10 to reset the clock, a MAP decoder 7 connected to the EPIC 3, and the MAP decoder 7 ROM 8 connected to the RAM 8, RAM 9 connected to the ROM 8, DPRAM 12 connected to the MFP 11 and RAM 9, and an external IDPA connected to the DPRAM 12. A system bus interface 13 is connected to the ISDN D-Channel Processing Board Assembly.

Briefly looking at the effect on the configuration, the data reception from each line is accumulated in the DPRAM 12, which is a communication means with the IDPA, the upper board under the control of the CPU 10. Data transmission to each line is performed through the reverse path when received for each channel, the present invention is mounted and executed in the ROM (8), ISDN subscriber board is a board that is closely related to the user by the request of the user It should be possible to perform call processing, control of various devices related thereto, and maintenance functions related to reliability of subscriber line. The maintenance function of the track is made at the request of the operator in order to receive the user's failure and prevent the failure.

2 is a flowchart illustrating a subscriber control method according to the present invention.

First, initialization of various devices and memories in the subscriber board, receiving call processing-related data and maintenance-related data from a common memory (CM; Commom Memory), which is a data transmission / reception area with an IDPA corresponding to a higher board, and receiving received call processing Process of performing maintenance-related functions transmitted / received to the terminal, transmitting call processing-related data received from the terminal to the CM, transmitting the performed maintenance-related result data to the CM, performing process of the CRC (Cyclic Redundancy Check) Terminal I / O control process, receiving and activating the terminal, receiving and activating the terminal and D-channel information, and performing an interrupt operation to control maintenance related functions. It consists of timer work process for setting flags for CRC execution.

3 is a detailed flowchart of FIG.

Initialization of various devices and memories in the subscriber board is performed by initializing various ports and registers in a one-chip micro computer unit (MCU), an IEC_Q (ISDN Echocancellation Circuit; 2B1Q), which performs digital subscriber and "U" interface functions. Extended PCM Interface Controller (EPIC) to control IEC-Q through PCM interface function and IOM2 (ISDN Oriented Modular 2nd generation) interface to form B-channel call, IDEC (ISDN D-Channel) Initialization of various devices such as Exchange Controller, initialization of CM, which is a data transmission / reception area with IDPA, initialization of a lamp indicating activation status of each subscriber, initialization of a timer of 40ms period, and initialization of various buffers used in this operation. .

Receiving data from the CM is carried out according to the operation method determined by using the CM in common with IDPA. In terms of the operation method, in the same memory area, the transmitting part writes data using a write cell and the receiving part receives data using a read cell. Each buffer of data is composed of seven buffers, which are modular 7 and are operated in a circular manner by write and read cells. From the point of view of the subscriber board, the data reception uses the read cell to find the receiving buffer pointer among the 7 receive buffers and reads the buffer flag. If there is a data transmitted by IDPA, the data is received and the call processing part is used for transmission to the terminal. It is transferred to the subscriber station transmission buffer area and once moved to the maintenance execution buffer area for maintenance.

The data transmission process from the transmit buffer area to the terminal is performed for each subscriber. If the subscriber line activation request is performed, the data is transmitted to IEC-Q using EPIC through IOM2 interface. Log data is transferred. If the length of the data frame to be sent to the subscriber line is 32 bytes or less, everything is performed in the transmission routine performed in the general work routine without going through the interrupt routine. However, in case of more than 32 bytes, only the first 32 bytes are made in the general work routine, and the remaining data is transmitted by IDEC TXFIFO empty interrupt in 32 byte units. The reason why the data is divided into 32 byte units is that the size of the transmission buffer in IDEC is 32 bytes.

The management of the transmit buffer area is managed by the same method as CM operation by putting 8 buffers per subscriber and modular write (modular 8), and the buffer pointer is modified every time data is written by IDEC. Is modified when the transmission of one frame is finished.

The process of performing maintenance-related functions per line is requested to drive and dismantle the relay to perform the IN / OUT-TEST of the subscriber line, to request and release the CRC to check the operation status of the subscriber line, and to the subscriber line that is inactive. Loop back test and release request for performance measurement, and reference value change and inquiry request for error rate applied to CRC test.

The CRC related function is performed as a basic function only for the subscriber which is activated by 1 second unit. First, if the 1 second flag controlled by the timer interrupt is set and checked, the result of CRC execution for the near end (NEAR_END) is read from the IEC-Q via EPIC. If an error occurs, the counter is incremented. Is compared with the reference value of the error number, which indicates the occurrence rate of the error for 1 second, and if it is higher than the threshold value, an alarm for error seconds and a threshold exceeded is reported as a higher value, and the CRC result is returned to a serious error number, that is, more than 69 errors in one second. If it occurs, it is regarded as a serious error of error, and if it is higher than the reference value, the counter for the serious error is increased. If the value of the counter is higher than the reference value, an alarm for a serious error of error is reported. The CRC test request reports the measurement on the CRC that has been performed so far to the upper part and the measurement on the CRC for the time required from the upper part to the upper part. After the execution of NEAR_ND, CRC function for the far end (FAR_END) is performed in the same way, and then the user is transferred to the next subscriber. The loopback test is to test the performance of the line for the inactive subscribers and is performed using the test apparatus. In the present invention, only the path is connected to each part (Line Terminator, Network Terminator).

The method 50 for transmitting the call processing data received from the terminal to the CM finds a buffer pointer using a read cell that is modular 24 and stores a flag to read a flag using a data receiving buffer in which data received by an interrupt of IDEC is stored. When new data is received, the data is transmitted in mode when the data can be written by reading the buffer flag by using the write cell of the CM and reading the buffer flag according to the CM operation method. The size of one buffer cell of the CM is 272 bytes. If the total length of the frame is smaller than this, the data of several frames may be transmitted to one buffer cell.

The transmission of the maintenance related result data to the CM is performed in the same way as the transmission of call processing related data.

Terminal I / O related control enables the monitoring of the status of subscriber board through the terminal even on-line. It checks the status of various devices, adds and deletes print statements, and displays status values of each buffer. ) And other necessary information.

The process of the status of the subscriber line, such as activation and deactivation of the subscriber, is controlled through the IOM2 interface by the EPIC, and the reception of the result is transmitted to the EPIC through the IOM2 interface. Other states of the line that can be monitored via the EPIC include activation of the U-interface only, frame loss, and loss of synchronization with the U-interface.

Direct transmission and reception of D channel information necessary for handset and call processing is controlled through IDEC and is carried on D channel of IEC-Q. The method of transmitting and receiving data through IDEC is as follows.

All data receiving operations are interrupted. If the length of the received data frame is more than 32 bytes, the data is received by IDEC's RXFIFO full interrupt. Received data is stored in a temporary buffer for each subscriber, and subscriber number, frame length, and primitive are added by IDEC's RXFIFO end interrupt indicating that the data has been received for the frame. It is moved to the data receiving buffer area that is used for all subscribers. The data transmission job transmits D channel data when the data can be transmitted by checking the line status of the frames stored in the data transmission buffer area composed of modular 8 for each subscriber and the line is busy. ), Go to the next subscriber.

The timer work process modifies the contents of a specific address every 40msec to inform the upper board IDPA that the present invention is operating normally, and sets a flag for the CRC test that is counted and performed in 1 second unit. .

Therefore, the present invention as described above performs basic functions related to call processing of ISDN subscribers included in the exchange and performs CRC for measuring BER (Bit Error Rate), ES (Error Second), etc. It has the function, and it is effective to perform maintenance function in conjunction with ISDN test equipment to measure the quality of the line for the ISDN line code.

Claims (1)

A first step of initializing various elements and memories in the subscriber board; A second step in which a data transmission / reception area with an upper board IDPA (ISDN D_Channel Processing Board Assembly) receives call processing related data and maintenance related data from a common memory (CM; Commom Memory); Performing a maintenance related function of transmitting and receiving the received call processing related data to the terminal; Transmitting a call processing related data received from the terminal to the CM; A fifth step of transmitting the maintenance related result data to the CM; A sixth step of performing a CRC (Cyclic Redundancy Check) related function; A seventh step of controlling input and output of the terminal; An eighth step of performing an interrupt operation for controlling activation and deactivation of a terminal, reception, control of a function of directly transmitting and receiving D-channel information with a terminal, and a maintenance related function; And a ninth step of performing a timer job for setting a flag for performing a CRC and the subscriber report is operating normally.