JPH0752969B2 - Dial pulse transmission control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dial pulse transmission control method in a time-division exchange device and the like, and is particularly suitable for controlling the transmission of dial pulses under the control of a microprocessor. And a dial pulse transmission control method.

[Conventional technology]

In the conventional dial pulse transmission method, for example, 168 to 1 of "Telephone exchange signaling method" (published by Telecommunications Association, written by Tatsuyuki Suzuki)
As described on page 70, during the impulse transmission by the operation of the dial pulse transmission relay (hereinafter referred to as the A position relay), the operation during the impulse is performed for the purpose of preventing the impulse distortion due to the termination of the communication path side and L and C. There is a dial pulse operation holding relay (hereinafter, referred to as a C position relay) for holding the. More specifically, it is operated by a hardware logic as described on pages 185 to 188 of "Crossbar basic circuit" (published by Telecommunications Association, Reijiro Fukutomi and Motojiro Shiromizu).

[Problems to be solved by the invention]

However, even if the C position relay keeps its operation until the transmission of all dialed numbers is completed, no trouble occurs, but the operation and the number of times of restoration are large. This is because the operation and recovery timing of the C position relay are performed by hardware logic, and it is not possible to identify the last digit dial pulse transmission, or there is a large amount of hardware for identifying that fact. Therefore, there is no choice but to adopt a logic such that the operation is performed only while sending the dial pulse of each digit, but the interval between digits is restored. Therefore, for example, when dialing a Japanese area code (usually 10 digits), since the operation and recovery are repeated 10 times, the number of times of operation of the C position relay becomes large, and as a result, the above C position relay is inevitably used. It required a relatively expensive one that can withstand the number of operations.

An object of the present invention is to provide a dial pulse transmission control method capable of significantly reducing the number of times of operation and restoration of a C position relay associated with dial pulse transmission as compared with the prior art, without relying on a large amount of hardware logic.

[Means for solving problems]

The purpose is to operate and restore the dial pulse transmission relay a predetermined number of times according to each dial digit, so that the dial digit having the desired number of digits can be obtained through the contacts of the dial pulse transmission relay. When the dial pulses are sequentially transmitted, the microprocessor keeps the operation during the dial pulse for preventing impulse distortion under the control of the microprocessor every time the dial number and the digit number as the transmission unit are received and stored. Relay
During the period from the start of the transmission of the dialed digits over the number of transmission digits of the transmission unit to the completion of the transmission, the operation is continuously performed, and after the completion of the transmission of the dialed numbers of the transmission unit, a certain timing is waited for and then the restoration is resumed This is achieved by sequentially transmitting the dialed digits of the desired digit while being enabled.

[Action]

The microprocessor provided in the dial pulse transmission device is provided as a substitute for a large amount of hardware logic, and a peripheral circuit in the device is realized by a program stored in ROM (herein called firmware to be distinguished from software). Is controlled. That is, at the start of dial pulse transmission for a transmission numeral (generally a plurality of digits) as a transmission unit stored in a transmission numeral buffer having an N-digit capacity, the A position relay is operated, and thereafter the C position relay is operated. Let After this, the firmware sends a dial pulse by operating and restoring the A position relay in accordance with the sent number in the sent number buffer. However, when the N-th digit in the sent number buffer has been sent, the firmware updates the C It is designed to take a certain timing to restore the position relay. If there are N + 1 or more transmission numbers, the second transmission number is stored in the transmission number buffer during this timing, and the numbers are transmitted in the same manner as above. If the second sending digit cannot be stored in the sending digit buffer within that timing, the C position relay is controlled to be restored after the end of the timing. More specifically, for example, assuming that the capacity of the sending numeral buffer is 4 digits, and a case where a 10-digit dialed numeral is sent, in this case, the sending numeral buffer has 4 digits. When the numeric, 4-digit, and 2-digit dialed numbers are transferred promptly without any delay, those 10-digit dialed numbers can be sent continuously with the C position relay operating continuously. Is. However, for example, when the two-digit number as the last transmission unit is slightly delayed and is transferred to the transmission-number buffer after a certain timing, the C-position relay is once restored and then the two-digit number as the last transmission unit is C. The position relay is again sent in a continuously operated state. After the 2-digit number is transmitted, the C position relay is restored after waiting for a certain timing. In this way, after waiting for a certain timing, C
The position relay is restored for the first time, even if the transfer of the succeeding sent digit to the send numeral buffer is delayed, the C position relay is continuously operated as much as possible and the succeeding sent digit is also sent. It's nothing but an excuse.

〔Example〕

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

The telephone is accommodated in the time division private branch exchange through the terminal interface unit 1 on the terminal side, and further, through the terminal interface control unit 2, the time division exchange switch 3, the terminal interface control unit 2, and the terminal interface unit 1, the public telephone network. It is designed to be housed in. The central control system device also comprises a control processing device 5, a memory device 6, etc., and a time-division exchange switch 3 and various terminal interface devices 1 are connected to a common bus by an exchange program (software) stored in advance in the memory device 6. The exchange process is performed by way of the line 4.

The dial pulse transmitting device according to the present invention is installed in a station line trunk as the terminal interface device 1 on the public telephone network side, and an internal configuration of an example of the station line trunk is shown in FIG.

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

As shown in the figure, the trunk line trunk is a microprocessor 8 which executes firmware in the memory 9 under the control of the central control system software via the terminal interface control device 2, the time division exchange switch 3 and the common bus 4 shown in FIG. , A position relay A which operates under the control of the above firmware, B which operates while the main line trunk is in use
A position relay B, a C position relay C directly related to the present invention, a two-wire / four-wire conversion hybrid circuit 10, an analog-digital conversion codec 11, a PCM highway interface circuit 12, and the like.
In the figure, c and a are contacts of relays C and A, respectively, and CO, R and L are capacitors, resistors and coils.
The dial digit sending operation in the central office trunk shown in FIG. 2 will be described below with reference to FIG. 1 showing the flow of the dial pulse sending processing according to the present invention in the microprocessor. The extension accommodated in the private branch exchange will be described. When the customer wants to connect with the subscriber accommodated in the central office and dials the desired subscriber number, the central control system software can recognize that the call is to the central office by analyzing the dial information. ing. Based on the recognition result, the control processing device 5 is provided with the microprocessor 8 in the central line trunk.
On the other hand, after transmitting a series of numbers to be transmitted and the number of digits to be transmitted, it is instructed to start transmitting the numbers to be transmitted. These are received and stored in the microprocessor 8 by the processes 13 to 15. However, when the transmission start instruction is received, the microprocessor 8 executes a predetermined procedure (firmware).
According to the procedure, first, in step 16, the A and B position relays A and B are operated to start the central office switch. After this, in step 17, the C position relay C is operated, and after prepausing, 1 is set in the register in step 18,
Subsequently, in step 19, the A position relay A is restored and operated only the number of times corresponding to the first digit in the transmission numeral buffer, and the loop between the terminals AO and BO is interrupted to transmit the dial pulse to the central office switch. ing. When the transmission of this first number is completed, it is determined in step 20 whether the value in the register and the number of digits to be received and transmitted match. If they do not match, the value in the register is updated by +1 in step 21. Then, after the minimum pause is performed, the second number is transmitted in the same manner as in the case of the first number by the process 22. Similarly, after the third digit and subsequent numbers, the coincidence between the value in the register and the number of received / transmitted digits is determined by the processing 24 and 27 each time it is sequentially transmitted. In this determination, the value in the register and the number of received / transmitted digits are determined. If they coincide with each other, it is judged that all the reception and transmission numbers have been transmitted, and the C position relay C is restored by the post-processing 29 for the first time at a constant timing T.
However, if it is known by the process 28 that the second transmission number is transmitted from the central control system software during the timing T, the restoration of the C position relay C is interrupted and the same method as the first transmission is performed. The second reception / transmission number is transmitted by the number of transmission digits. After this, a fixed timing is taken as in the case of the first time, but if the third transmission number is not transmitted from the central control system software during this timing T, wait for the end of the timing T. The C position relay C is to be restored.

〔The invention's effect〕

As described above, in the case of the present invention, since the C position relay is controlled by the microprocessor provided in the dial pulse transmitting device, the final digit number of transmission can be easily determined. Therefore, it is not necessary to restore the relay, and therefore it is possible to operate until the completion of digit transmission, and it is possible to reduce the number of operations of the C position relay. As a result, in selecting the C position relay, a cheaper one with a short operation / recovery life can be used, and the number of attachments peculiar to the C position relay is unnecessary, so that the dial pulse can be economically transmitted. There is an effect.

[Brief description of drawings]

FIG. 1 is a diagram showing a flow of a dial pulse transmitting process according to the present invention by a microprocessor, FIG. 2 is a diagram showing a configuration of an office line trunk including a dial pulse transmitting device according to the present invention, and FIG. FIG. 1 is a diagram showing a configuration of a time division private branch exchange to which the present invention is applicable. 8: Microprocessor, A: A position relay, B: B position relay, C: C position relay.

Claims (2)

[Claims] 1. A dial number having a desired number of digits through a contact of the dial pulse transmitting relay by operating and restoring the dial pulse transmitting relay a predetermined number of times according to each dial number. Is a dial pulse transmission control method in the case of being sequentially transmitted as a dial pulse, wherein the microprocessor controls the transmission dial number and the transmission digit number as a transmission unit every time it is received and stored. , The dial pulse in-motion holding relay for preventing impulse distortion is continuously operated during the period from the start of transmission of dial digits over the transmission digit number of the transmission unit to the completion of the transmission. After waiting for a certain timing from the completion of sending the dialed digits, the dialed digits of the desired digit can be sent out sequentially while the restoration is possible. Iyaruparusu transmission control method. 2. When a transmission dial number and a transmission digit number as a next transmission unit are received and stored at a fixed timing, the operation holding relay during dial pulse is continuously operated in a state in which the operation is continued. While the dial pulse is sent to the sending unit, when the sending dial number and the sending digit number as the next sending unit are received and stored after a certain timing, the operation holding relay during dial pulse in the restored state is in the working state again. The dial pulse transmission control method according to claim 1, wherein the dial pulse is transmitted to the next transmission unit in the state of being placed.