JPS61131667A - Signal transmission control system - Google Patents

Abstract

PURPOSE:To make the subscriber circuits small and to make a system economical by providing plural numbers of subscriber circuits with the change-over means for switching call signal to and from howler signal in common. CONSTITUTION:In order to transmit a call (r) signal to a subscriber 4, a line processor 5 periodically energizes an SG relay 14 of a subscriber circuit 1 corresponding to a subscriber 4 and transmits the call signal (r) supplied from a common circuit 8 via a contact switch 16 to the subscriber 4 via a trip circuit 9 and a resistor 10. When the subscriber 4 takes upward a handset, the trip circuit 9 detects it and sends the signal to the processor 5. On the other hand, when a howler signal (h) is sent to the subscriber 4 where the handset remains unhooked, the processor 5 makes sure all the subscriber circuits 1 that a common circuit 8 is used in common do not transmit the call signal, energizes the SW relay 15 installed in the common circuit 8, and supplied the howler signal to subscriber circuit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a signal transmission control system in a subscriber circuit of a digital exchange.

In digital exchanges, since high-level signals cannot be transmitted through the communication channel network, the subscriber circuit is equipped with a function to send out a paging signal or a howler signal.

It should be noted that the subscriber circuit is the circuit that is required in the largest number among the circuits constituting the digital exchange, and therefore it is desired that the subscriber circuit be constructed as compact and economically as possible.

[Conventional technology]

FIG. 2 is a diagram showing an example of a conventional signal transmission control system.

In FIG. 2, each subscriber circuit 1 is provided with an RG relay 2 for sending out a calling signal and an HW relay 3 for sending out a howler signal. When the line processor 5 periodically energizes the RG relay 2 of the corresponding subscriber circuit 1 in order to send a ringing signal r to the subscriber 4, the RG contacts 6 and 7
operates periodically, and when activated, a call signal r supplied from a common circuit 8 is sent to a trip circuit 9 and a resistor 1.
0 to subscriber 1, and stops sending out the ringing signal r when rg contacts 6 and 7 are in the restored state. If the subscriber 4 lifts the handset (off-hook) while the rg contacts 6 and 7 are in operation, the trip circuit 9 detects the off-hook and notifies the line processor 5 to that effect. The line processor 5 that has received the notification stops energizing the RG relay 2 and stops sending out the call signal r. Further, when the subscriber 4 raises the handset while the rg contacts 6 and 7 are restored, the power supply monitoring circuit 11 detects the off-footer, notifies the line processor 5 to that effect, and stops sending out the ringing signal r.

On the other hand, in order to send a howler signal to the subscriber 4 who is off the hook, when the line processor 5 energizes the HW relay 3 of the corresponding subscriber circuit 1, the hW contacts 12 and 13
becomes operational and sends a howler signal to subscriber 4,
Reminds people to take the phone off the hook. When the subscriber 4 notices that the handset has been disconnected and puts the handset down (on-hook), the howler signal sending device (not shown) detects the on-footer, causes the line processor 5 to stop energizing the HW relay 3, and sends the howler signal. stop sending out the data.

[Problem to be Solved by the Invention 3] As is clear from the above explanation, in the conventional signal transmission control system, the RG relay 2 and H
Since it is necessary to provide the W relay 3, there is a risk that miniaturization and economicalization of the subscriber circuit 1 will be impaired.

It is also possible to remove the function of transmitting howler signals from each subscriber circuit 1 and transmit low-level howler signals from a signal tone generating device connected via the communication path network.
There is a risk that the subscriber 4 will not notice this, and this cannot be a sufficient solution.

[Means for solving problems]

The problem is that in a subscriber circuit having a function of transmitting a paging signal and a howler signal, a plurality of subscriber circuits are provided with switching means for switching either the paging signal or the howler signal and supplying the same to each of the subscriber circuits. A transmitting means for transmitting a paging signal or a howler signal supplied from the switching means to the subscriber is provided in common to each of the subscriber circuits, and when none of the subscriber circuits is in a paging signal transmitting state, The problem is solved by the present invention, characterized in that the switching means is set to a Howler signal supply state.

[Effect]

Particularly, according to the present invention, the switching means between the calling signal and the howler signal is provided in common for a plurality of subscriber circuits, and the signal sending means provided in each subscriber circuit is commonly used for the calling signal and the howler signal. , miniaturization and economicalization of subscriber circuits are promoted. Note that while any subscriber circuit is sending out a calling signal, it is impossible to send out a howler signal, but since the sending of a howler signal is not required to be as real-time as sending out a calling signal, it is not possible to send out a howler signal. By sending out a howler signal when the caller circuit does not send out a calling signal, convenience is not compromised.

〔Example〕

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

FIG. 1 is a diagram showing a signal transmission control system according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 1, each subscriber circuit 1 is provided with only an SG relay 14 as a signal sending means, and the common circuit 8
An SW relay 15 is provided in common to a plurality of subscriber circuits 1 as signal switching means.

In FIG. 1, SW relay 15 normally located in common circuit 8
is in a restored state, and a ringing signal r is being supplied to each subscriber circuit 1 via the SW contact 16.

In order to send the calling signal r to the subscriber 4 in such a state, the line processor 5 connects the SG relay 1 of the subscriber circuit 1 to which it corresponds.
When 4 is energized periodically, sg contacts 17 and 18 are activated periodically, and when the sg contacts 17 and 18 are activated, the common circuit a to 3 is activated.
The ringing signal r supplied via the W contact 16 is sent to the subscriber 4 via the trip circuit 9 and the resistor 10, and the sg
When contacts 17 and 18 are in the recovery state, the ringing signal r
stop sending. Note that when the subscriber 4 lifts the handset (off-hook) while the sg contacts 17 and 18 are operating, the trip circuit 9 detects the off-hook and notifies the line processor 5 to that effect. When the line processor 5 receives an on-hook notification from the subscriber circuit (2) which is sending the ringing signal r, it determines that the corresponding subscriber 4 has responded, stops energizing the SG relay 14, and sends the ringing signal r. stop sending.

Further, when the subscriber 4 raises the handset while the sg contacts 17 and 18 are restored, the power supply monitoring circuit 11 detects the off-hook, notifies the line processor 5 to that effect, and stops sending out the calling signal r.

On the other hand, when sending a howler signal to the subscriber 4 who is off the hook, the line processor 5 confirms that all the subscriber circuits l sharing the common circuit 8 are not in the sending state of the calling signal r. Above, the SW relay 15 provided in the common circuit 8 is energized.

As a result, the SW contact 16 becomes operational, and each subscriber circuit 1 is supplied with a Howler signal R instead of the ringing signal r. In this state, when the line processor 5 energizes the SG relay 14 of the corresponding subscriber circuit 1, the SG contacts 17 and 18 become operational, and the trip circuit 9 and the resistor 10
A howler signal is sent to the subscriber 4 via the telephone to alert the subscriber to take off the telephone receiver. When the subscriber 4 who notices that the handset has been disconnected puts down the handset (on-hook), the trip circuit 9 detects the on-hook and notifies the line processor 5 to that effect. When the line processor 5 receives an on-hook notification from the subscriber circuit 1 that is currently transmitting a howler signal, it determines that the corresponding subscriber 4 has recovered, and the SG of the subscriber circuit 1
The energization of the relay 14 and the SW relay 15 of the common circuit 8 is stopped, and the transmission of the howler signal is stopped.

As is clear from the above description, according to the present embodiment, the ringing signal r and the howler signal R are connected to the S
The signals are switched by the W relay 15 and supplied to each subscriber circuit 1, and each subscriber circuit 1 is provided with only one SG relay 14 which is shared for sending out the calling signal r and the howler signal r. The circuit 1 can be made smaller and more economical.

Note that FIG. 1 is only one embodiment of the present invention, and for example, the signal switching means and the signal sending means are not limited to relays (there are many modifications to the structure realized by electronic switching elements). However, the effects of the present invention remain the same in either case.

〔Effect of the invention〕

As described above, according to the present invention, the switching means between the calling signal and the howler signal is provided in common to a plurality of subscriber circuits, and the signal sending means provided in each subscriber circuit sends out both the calling signal and the howler signal. Since the subscriber circuit is shared by multiple users, the subscriber circuit can be made smaller and more economical.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a signal transmission control system according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a conventional signal transmission control system. In the figure, 1 is the subscriber circuit, 2 is the RG relay, and 3 is the H
W relay, 4 is subscriber, 5 is line processor, 6 and 7 are rg contacts, 8 is common circuit, 9 is trip circuit, 1
0 is a resistor, 11 is a power supply monitoring circuit, 12 and 13 are hw
Contact, 14 is SC relay, 15 is SW relay, 16 is s
W contact, 17 and 18 are SW contacts, h is Howler signal,
r indicates a calling signal. brown 2nd

Claims (1)

[Claims] In a subscriber circuit having a function of sending out a calling signal and a howler signal, a plurality of subscriber circuits are provided with switching means that switches between the calling signal and the howler signal and supplies the same to each of the subscriber circuits; Each subscriber circuit is provided with a sending means for sending the calling signal or howler signal supplied from the switching means to the subscriber, and when none of the subscriber circuits is in the calling signal sending state, the switching means is set to the howler signal. A signal transmission control method characterized by setting a signal supply state.