JPH0418741B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In a fault detection method for a paging signal output device, a fault is detected based on whether or not additional information of the paging signal output device is received, which is input to a control unit of a subscriber circuit. .

[Industrial application field]

TECHNICAL FIELD The present invention relates to a fault detection method for a calling signal output device.

A telephone switching system is provided with a calling signal output device that sends a calling signal to a telephone terminal connected via a subscriber circuit.

However, if this call signal output device fails, the function of the system itself is impaired, so it is necessary to detect this failure by some means.

[Conventional technology]

Conventionally, failures in a calling signal output device have been detected by providing a failure detection circuit in the device itself. In this fault detection method, when a fault is detected by the above-mentioned detection circuit, it is notified to an external display or central control unit.

[Problem that the invention seeks to solve]

However, the conventional system requires a separate failure detection circuit as described above. It is also necessary to provide a signal line to notify the display or central control unit of a failure. Therefore, there is a problem that the mounting space becomes larger and the cost also increases.

Furthermore, in order to detect non-mounting, a circuit for detecting non-mounting is required in addition to the above-mentioned fault detection circuit, which further increases the mounting space and cost.

[Means for solving problems]

An object of the present invention is to solve the above-mentioned problems, and to determine whether or not the additional information is in a predetermined pattern by analyzing the additional information from the calling signal output device in a control unit (for example, a processor) of the subscriber circuit. The goal is to detect failures without installing new circuits.

The principle will be explained as follows based on FIG.

That is, phase information RGP0 and RGP1, which is a type of additional information sent from a paging signal output device, such as a ring generator, is used. This phase information is
As disclosed in Japanese Patent Application No. 59-136555 filed on July 3, 1980, it is used for relay control of calling signal transmission.

Of the above phase information, RGP0 is sent out at regular intervals, and RGP1 is sent out continuously. By inputting these RGP0 and RGP1 to the processor of the subscriber circuit, it is first determined whether RGP1 has been detected within a certain period of time (A-1). If there is a failure in the timing circuit (A-2), even if RGP1 is detected and the RGP1 counter in the processor exceeds the allowable value, RGP0 is not detected (A-2). RGP0
Even if it is detected, if it is outside the allowable range of the RGP1 counter (A-3), it is assumed that a failure has occurred in the timing circuit, and the respective processing is attempted.

[Effect]

The above additional information is originally used for relay control of the calling signal output device (calling signal sending circuit). Therefore, according to the present invention, a fault can be detected by the processor in the subscriber circuit decoding this additional information generated by the paging signal output device, so there is no need to provide a special circuit, and the mounting space and cost can be saved. Increase is avoidable.

〔Example〕

Hereinafter, the present invention will be explained by way of examples with reference to the accompanying drawings.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

The apparatus shown in FIG. 2 is comprised of a linkage generator 1, a network 2, a central control unit 3, a subscriber circuit 4, a display 5, and a telephone terminal 6.

The ring generator 1 forms a calling signal output device (calling signal sending circuit) and provides the subscriber circuit 4 with the following information:
It sends out a paging signal IR and phase information RGP0 and RGP1, which is a type of additional information. RGP0 indicates a periodic signal, and RGP1 indicates a continuous signal.

The configuration of the subscriber circuit 4 is as shown in FIG.
It consists of a processor 41, an RTP 42, a flip-flop 43, a transformer 44, a transistor 45, etc., and receives the calling signal IR from the ring generator 1 and sends it to the telephone terminal (), as well as phase information.
A failure is detected by receiving RGP0 and RGP1 by the processor 41 ().

The processor 41 is composed of an RGP0 register 411, an RGP1 register 412, an additional information detection/judgment processing section 413, etc. shown in FIG. When notified, the abnormality is displayed on the display 5.

In addition, the above calling signal IR and phase information RGP0 and RGP1
As mentioned above, these are disclosed in Japanese Patent Application No. 59-136555, and the relationship between these three will be briefly explained.

That is, the ringing signal IR and the phase information RGP0, RGP1 are all output by the linkage generator 1. The IR becomes the ring tone of the telephone terminal 6. The phase information is input to the processor 41 in the subscriber circuit 4, which selects the phase of the ringing tone and activates a switch l (FIG. 3) to create the correct phase for the telephone terminal 6.
Turn on/off.

As shown in Figure 6A, the IR is a normal ringtone of 900
Two types of patterns: m seconds on, 100 m seconds off (PHASE #0 selection or PHASE #2 selection:
50ms OFF→900ms ON→50ms OFF;
1 second in total) and 350 msec on, 200 msec off,
Two types of patterns: 350ms on, 100ms off (PHASE #1 selection or PHASE #3 selection:
50ms OFF→350ms ON→200ms OFF→
350ms ON → 50ms OFF; 1 second in total). The phase information RGP0 and RGP1 are used for phase identification and for operating the ring tone transmission open/close switch r1 to the telephone terminal 6 during the ring tone pause between phases (for noise reduction).

As shown in FIG. 6B, the phase information RGP0 is 4
This is a signal that outputs low-level pulses at intervals of seconds.
In the time interval of 4 seconds, the above 4 PHASE
A calling signal IR is composed of #0 to #4.
As shown in FIG. 6C, the phase information RGP1 is a 20 Hz signal. Here, RGP0 is, for example, 20Hz
Used to reset the counter that counts RGP1 periodically (every 4 seconds), and outputs the ring tone of the telephone terminal while the reset counter counts RGP1 for the first 20 counts, and then outputs the ring tone for the next 20 counts. During this period, the telephone terminal's ring tone is stopped and this process is repeated sequentially. In addition, RGP0 is 4
RGP1 outputs low-level pulses at second intervals.
Periodically reset the counter that counts the
For example, this is to accurately control sending and stopping of a ring tone of a telephone terminal. Ring generator 1
If a failure occurs in RGP0 and RGP1, the signals of RGP0 and RGP1 will be disturbed and the count results will no longer match.

Also, if the linkage generator is not implemented,
Both RGP0 and RGP1 will no longer be output.

By detecting these in the subscriber circuit 4, it is possible to notify the central control unit 3 of a failure or non-installation of the linkage generator 1.

This method allows the function to be realized without providing any additional failure or non-mounting detection circuit, and has the effect of reducing costs and mounting space.

Hereinafter, the operation of the present invention using the phase information RGP0 and RGP1 will be explained based on FIGS. 2 and 5.

First, according to an instruction from the central control device 3 to the processor 41 of the subscriber circuit 4 (), the ringer current IR from the ringer generator 1 is pattern-controlled (FIG. 6A), and sent to the telephone terminal 6 via the subscriber circuit 4. Sent to ().

Phase information for this pattern control at the same time
RGP0 and RGP1 are sent to the processor 41 ().

Here, the processor 41 executes the judgment processing section 4.
13, it is determined whether a failure has occurred in the linkage generator 1 (FIG. 4).

As shown in FIG. 5, in monitoring the phase information RGP1, the processor 41 reads RGP1 from the RGP1 register 412 (B-1). If it is not detected within a certain period of time, the processor 41 detects the unimplemented or calling signal sending circuit. (B-2, B
-3, B-4, B-5).

Also, if RGP1 is detected, the RGP1 counter is updated and the clock counter is cleared (B-
2, B-6, B-7). On the other hand, when monitoring the phase information RGP0, read the RGP0 register 411 (C
-1) If there is no change, check the upper limit of the RGP1 counter, and if RGP0 cannot be read from the RGP0 register 411 even if the upper limit is exceeded, it is determined that there is a failure in the timing circuit of the linkage generator 1 (C -2, C-7, C-8, C-
9).

Furthermore, even if RGP0 is read, the upper and lower limits of the RGP1 counter are checked, and if they are outside the allowable range, it is determined that a failure has occurred in the timing circuit as well (C
-2, C-3, C-4, C-9).

If the above failure is detected, the processor 41
The central control device 3 is notified and the result is displayed on the display 5 ().

Other than the above, it is determined that the ring generator 1 is operating normally (C-5, C-6).

〔Effect of the invention〕

As described above, according to the present invention, failures can be detected by the processor in the subscriber circuit analyzing this additional information generated by the paging signal output device.Therefore, there is no need to provide a special circuit, and the implementation space and costs are reduced. can be avoided from increasing.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is a block diagram of a subscriber circuit, Fig. 4 is a block diagram of a processor, and Fig. 5 is a block diagram of an embodiment of the present invention. The operation explanatory diagram, FIG. 6, is a waveform diagram of the present invention. 1...Linkage generator, 2...Network, 3...Central control unit, 4...Subscriber circuit, 5
...Display, 6...Telephone terminal.

Claims (1)

[Scope of Claims] 1. In a system having a ringing signal output device that transmits phase information for controlling sending and stopping of a ringing signal to a control unit of a subscriber circuit, the control unit in the subscriber circuit controls the phase information. A method for detecting a fault in a calling signal output device, comprising monitoring information and detecting a fault in the calling signal output device based on the presence or absence of the phase information. 2. A fault detection method for a calling signal output device according to claim 1, wherein the phase information consists of a continuous signal and a periodic signal, and the fault location is identified based on the presence/absence relationship of the two types of phase information.