JPS5895456A - Detection system for hooking signal - Google Patents

Abstract

PURPOSE:To substitute a dial signal for a hooking operation, by converting a dial pulse signal to a signal having the width of a hooking signal with hardware in a subscriber loop monitor circuit. CONSTITUTION:In a subscriber loop monitor circuit, a hooking signal is detected with a dial signal by selecting either one of the output signal of a means, which generates pulses having a certain time width and are operated by the loop disconnection due to a dial pulse or hooking, and the dial pulse in a state discriminating means which discriminates the dial pulse counting state or the busy state. In the state discriminating means is executed to expaud EXP the order from a control program and to set a flip flop FF to discriminate the state. Pulses having a certain time width operated by the loop disconnection are generated by a monostable multivibrator MM. On a basis of the state of the FF, a selecting circuit SEL selects either one of the dial pulse and the pulses having a certain time width.

Description

[Detailed description of the invention] The present invention relates to a hooking signal detection method.

Loop monitoring of subscribers in automatic exchanges using the storage program control method is carried out by scanning the signals of the loop monitoring circuit at regular intervals.

Generally, the subscriber loop on/off signal means a dial pulse, hooking, subscriber response, or subscriber recovery, but in the case of dial pulse, the loop on/off time width is short, and it also means hooking, subscriber response, or subscriber recovery. Since it is long in the case of subscriber restoration, the scanning period times of f are different and are often monitored by separate programs.

FIG. 1 is a circuit diagram of a conventional subscriber loop monitoring circuit.
Figure 1 <a> shows a method in which the loop of participating devices is monitored by relay A in telephone trunk TK through switch SW, and the information at contact point a is the gate signal G that arrives at the scanning period.
The result for ATE is returned as 8CAN. FIG. 2(b) shows that the subscriber's loop is detected by the loop detection photocoupler PC in the subscriber circuit LC, and FIG.
), it is output as a 5CAN result.

Therefore, with a slow-cycle hooking detection program, dial pulses cannot be detected accurately, so instead of hooking signals, dial pulses (for example, %II
dial) could not be used.

The above problem did not exist in crossbar type exchanges; in crossbar type exchanges, hooking operations were performed using dial pulses, but in electronic exchanges using an accumulation program control system, hooking operations using dial pulses were allowed. I haven't. Therefore, when performing a 7-tick operation using a dial pulse in an electronic exchange system, there is a drawback that due to the inexperience of the hooking operation, it is not processed as a 7-took fc#), and the process is mistakenly shifted to the recovery process. The purpose of this is to eliminate these drawbacks of the conventional one and to convert the dial pulse signal to 7 in hardware in the adder loop monitoring circuit.
By converting the signal to a signal with the width of a dialing signal, it is possible to substitute a dial signal for a seven-tracking operation.

According to the present invention, the subscriber loop monitoring circuit includes a state identifying means for determining whether dial pulses are being counted or a call is in progress, a pulse generating means that operates when the loop is broken due to dial pulses or cutting, and an output of the state identifying means. There is obtained a hooking signal detection system characterized in that the method includes means for selecting either a radial pulse or an output signal of the pulse generating means as a signal.

That is, in order to realize the present invention, one subscriber loop monitoring circuit (
For example, in the subscriber circuit (the same applies even if the telephone trunk is collapsed), a flip flop is provided to identify whether dial pulses are being counted or a call is in progress, and the subscriber's loop information is stored while dial pulses are being counted. is directly output as a scanning result to the control program, making it possible to count dial pulses. Also, during a call, even if a dial pulse arrives, there is no need to count the dial pulses, so a monostable multivibrator is used to extend the dial pulse as a 7-pulse signal with a certain width or more to detect hooking. The dial pulse can be detected as a 7-king signal by programming (slow cycle activation).

Similarly, even after transitioning to a call, it is necessary to count dial pulses following the 7 lagging operation, but in this case, the identification flip-flop is again set to count dial pulses.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, showing a case where the subscriber loop monitoring circuit is provided in the subscriber circuit, and FIG. 3 shows a waveform diagram of each part thereof. In FIG. 2, the MMH monostable multivibrator, FF is a flip-flop, AND is an AND circuit, EXP is an expansion circuit, and SEL is a selector.

Set by expanding the order from the flip-flop FFi control program with the order expansion circuit EXP,
Reset t1 The output of the flip-flop FF (FIG. 3(d)) indicates that the dial pulse is being counted when the signal is %l, and when it is the signal %Hl, it indicates otherwise. Meanwhile, the subscriber's loop is detected by the optocoupler PC, resulting in (
3(a)) is input to a monostable multivibrator MM, and the multivibrator MM is constant 1! as shown in FIG. 3(b). Output the T+ signal and input it to AND. Input the loop detection result (Fig. 3 (a)) as is into the AND other input, and
An output signal as shown in Figure (C) is generated so that the recovery conditions can be monitored. Here, the output of the flip-flop FF (
3(d)) becomes the selection signal of the selector SEL, and the subscriber loop information (FIG. 3(a)) itself or the A
-ND gate output (FIG. 3(C)) is selected, and the scan result SCAN for the scanning signal GATE from the control program is output (FIG. 3(e)). In FIG. 3(e), T indicates the hooking detection pulse width, ll'l indicates the recovery detection width, P indicates the period of pulse reception, F indicates the hooking time, and H indicates the backward and forward time. In this way, depending on the set/reset state of the flip-flop, it is possible to output the dial pulse as it is as a scanning result during dial pulse counting, and to convert the dial pulse into a hooking signal and output it during a call. Therefore, even if the scanning period of the hooking detection program is slowed down, hooking operation using dial pulses is possible.

As explained above, the present invention detects picking in an automatic exchange using an accumulation program control method by converting a dial pulse into a picking signal in a subscriber loop monitoring circuit, thereby substituting a 7-picking operation with a long-term pulse. FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a waveform diagram of each part thereof.

Placement...Subscriber, SW...Switch, A
-...Subscriber loop monitoring relay, a...
A relay contact, GATE...Scanning signal from control program, 8CAN...Scanning result, PC
...Photocoupler, MM ... Monostable multivibrator, AND - ...AND game), FF +++++ identification flip-flop, EXP
......Order expansion circuit, 5EL-...Selector.

5 (AN (of) SW Figure 1 Figure 2 Ward 3

Claims (1)

[Claims] a state identifying means for determining whether the subscriber loop monitoring circuit is counting dial pulses or during a call; a pulse generating means that operates when the loop is broken due to dial pulses or hooking; and means for selecting one of the output signals of the pulse generating means and the output signal of the pulse generating means.