JPS63132594A - Dial pulse sending-out control system - Google Patents

Abstract

PURPOSE:To decrease the number of times of an operation of a C position relay and to use an inexpensive C position relay by setting the C position relay to an operating state while there is a digit numeral to be sent out by a microprocessor provided on a dial pulse sending-out device. CONSTITUTION:When an extension contained in a private branch exchange equipment dials a desired subscriber's number, a controlling processor 5 transmits a series of sending-out numerals and sending-out digit numbers, etc., to a microprocessor 8 in a main wire trunk, and thereafter, instructs to start to send them out. The microprocessor 8 starts an office exchange by operating A and B position relays A, B, and thereafter operates a C position relay C, takes a prepause, and thereafter sets '1' to a register, operates the relay A and sends out a dial pulse of the first numeral to the office exchange. Thereafter, a value by the register and the received sending-out digit number, and unless they coincide with each other, the value by the register is updated by +1, and thereafter, whenever a second numeral and the following numerals are sent out successively in the same way, the coincidence of the value by the register and the received sending-out digit number is decided. If they coincide in this decision, it is decided that sending-out of all the received sending-out numbers has been completed, and after taking a prescribed timing, the relay C is released.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dial pulse sending control method in a time division switching device, etc., and particularly relates to a dial pulse sending control method suitable for devices equipped with a microprocessor. be.

[Conventional technology]

In the conventional dial pulse sending method, for example, 16
As described on pages 8 to 170, during impulse transmission, a C position relay is provided at the end of the communication path side, and for the purpose of preventing impulse distortion due to C, a C position relay is provided which maintains operation during impulse transmission. More specifically, it operates based on the hardware logic described in 185-188 of ``Crossbar Basic Circuit'' (Published by Telecommunications Association, written by Reiji Fukutomi and Motoji Shiromizu). ing.

[Problem that the invention seeks to solve]

However, even though the C position relay does not cause any trouble even if its operation is maintained until the transmission of all dialed digits is completed, the number of times it operates and recovers is unnecessarily large. This is because the operation and recovery timing of the C position relay is performed by hardware logic, and since it requires a large amount of hardware to identify the last digit dial pulse transmission, each digit The system had no choice but to adopt a logic in which it operates only while dial pulses are being sent, but restores between digits. Therefore, for example, when dialing a Japanese area number (usually 10 digits), the operation and recovery are repeated 10 times, so the number of operations of the C position relay becomes large. This required a relatively expensive device that could withstand the number of operations.

An object of the present invention is to keep the C-position relay operating while dialing digits are being sent out, and to resume operation once the sending of the final digit is completed, thereby reducing the number of operations of the C-position relay to about 1 compared to the conventional one.
The purpose of the present invention is to provide a dial pulse sending control method that can reduce the number of dial pulses to about 710.

[Means for solving problems]

The above object is achieved by leaving the C position relay active while there are digits to be sent out by the microprocessor.

[For production]

The microprocessor included in the dial pulse sending device is RO? Peripheral circuits within the device are controlled by an integrated program (herein referred to as firmware to distinguish it from software). That is, N
When starting dial pulse transmission for the sending digits stored in the sending digit buffer with digit capacity, the dial pulse sending relay (generally referred to as the A position relay) is operated, and then the C position relay is operated. .

After this, the firmware sends out a dial pulse by operating and restoring the A position relay according to the sending digits in the sending digit buffer, but when the sending of the Nth digit in the sending digit buffer is completed, the firmware
A certain timing is required to restore the position relay. If there is a sending number of N+1 digits or more, the second sending number is stored in the sending number buffer during this timing, and the number is sent in the same manner as above. If the second transmitted number is not stored in the transmitted number buffer within that timing, control is performed to restore the C position relay after waiting for the end of that timing.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3, taking a time-sharing private branch exchange system as an example.

As shown in FIG. 3, the time-division private branch exchange system uses the time-division exchange switch 3 as the center, and via the time-division switch 3 and the terminal interface control device 2 by the PCM highway.
It is composed of various terminal interface devices 1 connected to a common bus 4 of the central control system and various devices of the central control system. The central control system device also includes a control processing device 5, a memory device 6, etc., and controls the time division exchange switch 3 and various terminal interface devices 1 by an exchange program (software) stored in advance in the memory device 6. Then, the exchange process will be performed.

Now, the dial pulse sending device according to the present invention belongs to the above-mentioned terminal interface device 1, and its internal configuration is shown in FIG. 2, using a central office line tonk as an embodiment of the present invention.

The central office line trunk is an interface device between the time division private branch exchange and the central office exchange, which is used when the extension line of the time division private branch exchange equipment communicates with the subscriber accommodated in the central office exchange. ing. That is, when a connection is desired to a subscriber accommodated in a central exchange, the private branch exchange sends out a dial pulse corresponding to the subscriber's number, just as if it were a telephone.

As shown in the figure, the central office line trunk includes the terminal interface control device 2 shown in FIG. ,
A-position relay A for sending dialed numbers that operates under the control of the above firmware, B-position relay 81 that operates while the main office line trunk is in use, C-position relay C that operates while sending dialed digits, 2-wire to 4-wire conversion hybrid circuit 10, analog - It is composed of a digital conversion copier 11, a PCM highway interface circuit 12, etc. Note that in the figure, c and a are the contacts of relays C and A, respectively, and Co, R, and L are capacitors, resistors, and wires, respectively. Below, referring to FIG. 1 showing the flow of dial pulse sending processing according to the present invention in a microprocessor, the operation of sending dialed digits on the office line trunk shown in FIG. 2 will be explained. When a subscriber wishes to connect to a subscriber housed in the central exchange and dials the desired subscriber number, the central control system software analyzes the dialing information and
It is possible to recognize that the call is to the central office exchange. Based on this recognition result, the control processing device 5 instructs the microprocessor 8 in the office line trunk to start transmitting the transmitted digits after transmitting a series of transmitted digits, the number of transmitted digits, etc. These are received and stored in the microprocessor 8 through processes 13 to 15, but when the microprocessor 8 receives a transmission start instruction, the microprocessor 8 first selects the A, B position relay A through a process 16 according to a predetermined procedure (firmware).

B is operated to start up the central office exchange. After this, the C position relay C is activated by process 17, and after taking the pre-pose, 1 is set in the register by process 18.
is set, and then in process 19, the A position relay A is restored and activated the number of times corresponding to the first digit in the sending digit buffer, and the loop between terminals AO and BO is interrupted, thereby sending dial pulses to the central office exchange. It is supposed to be done. When the sending of the first digit is finished, it is determined in process 20 whether the value in the register matches the number of received and sent digits, and if they do not match, the value in the register is updated by +1 in process 21. After that, the second digit is sent out in the same way as the first digit in process 22. 3rd below
Similarly, each time the numbers are sequentially transmitted, the match between the value in the register and the number of received and transmitted digits is determined in process 24.26, but in this determination, the value in the register and the number of received and transmitted digits are determined to match. If so, it is determined that all received and transmitted numbers have been transmitted, and only then is the post-processing 29 performed at a certain timing T to restore the C position relay C. However, if it is found in the process 28 that a second transmission number has been transmitted from the central control system software during timing T, the recovery of the C position relay C is interrupted and the same method as the first transmission is performed. The second reception and transmission number is transmitted for the number of digits to be transmitted. After this, a fixed timing is taken as in the first case, but if the third transmission number is not sent from the central control system software during this timing T, the system waits for the end of that timing T. C position relay C is the one that will be restored.

〔Effect of the invention〕

As explained above, in the case of the present invention, since the C position relay is controlled by the microprocessor included in the dial pulse sending device, the final number of digits to be sent can be easily determined. There is no need to restore the relay, so it is possible to operate it until the number transmission is completed, and it is possible to reduce the number of times the C position relay operates. As a result, when selecting a C-position relay, it is possible to use a cheaper one with a short operating life, and since there is no need for an attached circuit specific to the C-position relay, the dial pulse can be transmitted economically. There is.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the flow of dial pulse sending processing according to the present invention by a microprocessor, FIG. 2 is a diagram showing the configuration of a central office line trunk as a dial pulse sending device according to the present invention, and FIG. , is a diagram showing the configuration of a time division private branch exchange device to which the present invention is applicable. 8...Microprocessor, A...A position relay, B...B position relay, C...C position relay. Agent Patent Attorney Tadashi Akimoto Figure 1 Figure 2 + 2 11 IQ Figure 3

Claims (1)

[Scope of Claims] 1. A dial pulse sending control system that sends out dial numbers by operating an A position relay according to the dial numbers under the control of a microprocessor included in a dial pulse sending device, comprising: A dial pulse sending control method characterized in that a C position relay is kept in an operating state under the control of a microprocessor from the start to the end of sending dial digits or until the sending of numbers for each plural digit is completed. 2. The C position relay is controlled to be restored after a certain timing from the time when all the dial digits for which the number of digits to be sent is known have been sent, and the next dial digit to be sent is determined during the above-mentioned certain timing. The dial pulse sending control system according to claim 1, wherein when a new occurrence occurs, restoration of the C position relay is interrupted.