JPS5830295A - Subscriber's circuit - Google Patents

Abstract

PURPOSE:To reduce the load imposed on the exchange processing program and improve the processing capacity, by installing a function of originating register to the subscriber's circuit. CONSTITUTION:An originating register circuit which receives the pulsing signal from telephone sets and delivers the dial tone or the busy tone to subscribers, is installed to a subscriber circuit which is the interface circuit of an electronic private automatic branch exchange and a telephone set. That is to say, the subscriber's circuit has an originating register 16 which contains, for example, a control section 33, a DC loop detecting element 31, a DC loop detecting and pulsing signal counting circuit 32, an audible signal tone sending circuit 35, and a gate circuit 34 for sending signal to central control unit CC, in addition to the normal function (such as sending audible ringing signal, answer detecting circuit, etc.). Therefore, the subscriber's circuit can execute the calling detection, dial tone connection, pulsing signal reception, and, as occasion demands, busy tone sending under the direct control of the central control equipment without requiring any switches.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a subscriber circuit for a stored program controlled private branch exchange.

The main function of conventional subscriber circuits is to detect the status of the terminal device, and does not have the function of receiving or counting dial signals. Conventionally, the function of receiving and counting such dial signals has been performed by a calling register. This calling register stores the number of devices calculated based on traffic based on the system's call volume on the trunk side, and when a subscriber makes a call, the empty calling register and the subscriber circuit are connected via a switch. . This transmission register has the functions of transmitting a dial tone and receiving a selection signal, as well as the function of transmitting a busy tone in response to the received selection signal.

Conventionally, the reason why one transmitting register is accommodated in the trunk side for the required number of devices is that the physical quantity of the transmitting register itself is large, so the method of installing registers corresponding to subscriber circuits has been considered from both economic efficiency and miniaturization. The reason is that it was not done. However, when the conventional method is adopted in an electronic exchange using the storage program control method, the selection signal received by the 5 transmission registers,
In particular, the process of counting dial pulse information by program requires a large number of program dynamic steps, which results in a reduction in traffic processing capacity when the call volume is large. Therefore, a distributed control method has been adopted to improve the performance of the central control section of the switching equipment, but establishing the switching processing using a distributed control method also has disadvantages from an economic standpoint in the case of a small-capacity switching method. Currently, there are more cases where 6 is adopted as a large-capacity exchange method.

The purpose of the present invention is based on the background that in today's technology, the adoption of microprocessors for hardware, that is, the establishment of hardware by firmware, is attracting attention from the standpoint of both miniaturization and economic efficiency. This was established because it became easier to provide register functions. According to the present invention, the fact that the subscriber circuit has the function of a calling register means that the number of calls made to the main body of the exchange, that is, the number of calls, can be reduced, and a device that can improve processing performance can be provided.

With the present invention, the subscriber circuit, in addition to the conventional functions such as monitoring the subscriber's DC loop, sending a ring tone, detecting a ground button, etc., also has the functions of sending a dial tone or a busy tone and counting a selection signal. do.

Next, an embodiment of the present invention will be described with reference to the drawings in comparison with a conventional system.

FIG. 1 shows a conventional subscriber circuit system. In the figure, there is a subscriber circuit 2 on each line of a switch 1, and a calling register 3 on the trunk side. When a subscriber's call is detected, the central control processing unit (CC) 4
connects the subscriber circuit 2 and the transmission register 3, and outputs the transmission tone DT.
is sent to the calling subscriber. Thereafter, the selection signals are received in the transmitter register 3 and counted under program control in the central controller 4. On the other hand, the @ figure shows a configuration example in which the switch does not transmit a DC signal, and the 0N10FF signal of the DC loop detected by the subscriber circuit 12 is condensed by the digital switch 15 and received by the register 16. (2) As in the figure, the selection signals are counted under the control of the central controller ccl 4.

In the latter case, the dial tone DT is transmitted from the tone trunk 13 to the subscriber. In both conventional examples shown in Figures AJ and B, the busy tone BT is also transmitted to the subscriber via the switch if necessary.

FIG. 2(a) and @ show an embodiment of the present invention, and in the relay system shown in FIG. Under the control of , the processes of call detection 1, dial tone connection 2, selection signal reception, and if necessary, busy tone transmission are executed, and the switch 20 is not used. To explain in detail using FIG. 0, the subscriber circuit includes a control section 33. DC loop detection element 31. DC loop detection and selection signal counting circuit 32. An audible signal sound sending circuit 35 and a signal sending game) I circuit 34 to the central control unit are built-in. Here, other functions as a subscriber circuit,
That is, the ring tone sending, response detection, earth button detection circuit, etc. are omitted because they are not related to the present invention. After the subscriber 80B's call is detected by the DC loop detection element 31, it is returned from the signal sending gate as a scan result for the call scan order from the central controller (CC).

After detecting a call, the central control unit (CC) sends an order to start the call register function to the corresponding subscriber circuit, and the subscriber circuit controller 33 connects the dial tone and after receiving the first digit. , and performs selection signal counting processing for the number of digits specified by the central control unit. When the register function is performed by the joining circuit, the central control unit only periodically performs an identification scan to indicate completion of reception of the selection signal, and does not perform any processing related to the number of 1-choice signals tl'. When the reception of the selection signal is completed, the received numeric information is scanned from the subscriber circuit, analyzed by a numeric analysis program in the central control unit, and the subsequent connection processing is started. When it is necessary to send out a busy tone, a busy tone transmission order is similarly sent to the subscriber circuit control section and sent to the subscriber from the audible signal advance transmission tB circuit. On the other hand, the function within the subscriber circuit as a register shall automatically end upon completion of receiving the number of digits designated by the central control unit. Further, in this embodiment, a maximum of four digit numbers are counted and sent back in parallel from %16 signal sending gate circuits.

According to the present invention, it is possible to provide a subscriber circuit that can reduce the processing load of an exchange processing program and help improve processing performance in both the centralized control method and the distributed control method.

[Brief explanation of the drawing]

1), @ is a conventional system diagram, 2m) is a relay system diagram according to the present invention, and FIG. 20 is a circuit diagram of an embodiment of the present invention. 1.11.20...Switch, 2,12.21...
Subscriber circuit, 4, 14, 22°°° central control unit (CC
), 3, 16... Transmission register, 13... Tone trunk, 15... Digital switch, 31... DC loop detection element, 32... DC loop detection and selection signal counting circuit, 33... Control unit, 34... inertia sending game) circuit, 35... audible signal sending circuit. (△) Sugar 1 diagram (A) 1 To CC (8) Figure 2

Claims (1)

[Claims] In the subscriber circuit, which is an interface circuit between the electronic automatic private branch exchange and the motive, there is provided a sub-path of a transmitting register for receiving an IL telephone or motive selection signal and transmitting a dial tone or a busy tone to the subscriber. A subscriber circuit featuring: