JPH0465599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage program control automatic switching system that uses an auxiliary device (trunk) developed exclusively for crossbar automatic switching in the storage program control automatic switching system.

In recent years, the development of storage program control type automatic switching equipment has been remarkable, and it is replacing the conventional crossbar automatic switching equipment and occupying the mainstream.

On the other hand, as crossbar automatic exchanges have expanded their services over the years, a wide variety of different or special auxiliary devices have been developed, and they continue to operate with high quality. Great efforts are also being made to expand the services of storage program controlled automatic exchanges.

However, it is possible to reuse trunks that have already been developed using a conventional crossbar automatic switch without changing the control device using the storage program of a storage program control type automatic switch, or by making changes that are less than the amount required for new development. Since this was not possible, it was necessary to develop a new trunk specifically for storage program control type automatic exchanges.

Hereinafter, based on the relay system diagram of a conventional storage program control automatic switching system shown in Figure 1 and the relay system diagram of a conventional crossbar automatic switching system shown in Figure 2, the trunk control system between a crossbar automatic switching system and a storage program control system automatic switching system will be explained. The differences will be explained using an example of an outgoing trunk to a trunk line.

In FIG. 1, 1 is a communication network, 2 is a subscriber,
Reference numeral 3 indicates an outgoing trunk dedicated to the storage program controlled automatic switching system, 4 indicates a control device based on the storage program, and 5 indicates a scanner. Further, in FIG. 2, reference numeral 6 indicates a communication path network, 7 indicates a subscriber, 8 indicates an outgoing trunk for exclusive use of a crossbar automatic exchange, and 9 indicates a common control unit marker.

In FIG. 1, when a subscriber 2 lifts up the handset and dials an access code to the trunk line, the communication path network 1
The subscriber 2 and the outgoing trunk 3 are connected via. At this time, connection confirmation information is sent from the trunk 3 through the scanner 5 to the control device based on the storage program. Selection of the trunk 3 is carried out autonomously based on the trunk vacant/busy information stored in the control device 4 according to the storage program. Recovery of the subscriber 2 is detected by the trunk 3, and the call termination information is sent via the scanner 5 to the control device 4 based on the storage program.The communication network 1 is restored under the control of the control device 4 based on the storage program, and the call termination information is sent to the control device 4 based on the storage program. 2
and the outgoing trunk 3 is disconnected.

In Figure 2, when subscriber 7 lifts the handset and dials the access code to the trunk line, marker 9
The subscriber 7 and the outgoing trunk 8 are connected via the communication path network 6 under the control of the subscriber 7 . At this time, trunk idle busy information and connection confirmation information are sent from the trunk 8 to the marker 9. Subscriber 7 is restored using trunk 8.
However, in the case of a crossbar automatic switch, the trunk 8 autonomously restores the communication path network 6, so the marker 9 is not involved.

As mentioned above, the trunk control method (in this example, the control method for outgoing trunks) is completely different between the storage program control type automatic switching system (exemplified in Figure 1) and the crossbar automatic switching system (exemplified in Figure 2). For this reason, it has conventionally been thought that a new trunk (in this example, the dedicated outgoing trunk 3 in FIG. 1) dedicated to the storage program control type automatic switching system must be developed.

An object of the present invention is to replace trunks that have already been developed with conventional crossbar automatic switching systems without changing the control device using the storage program of the storage program control type automatic switching system, or with a smaller amount of changes than required for new development. It is an object of the present invention to provide an automatic exchange using a storage program control method, which enables reuse of the stored program.

The outline of the present invention will be explained below with reference to FIG.

FIG. 3 is a relay system diagram of a storage program control type automatic exchange to which an embodiment of the present invention is applied.
In Figure 3, 1, 2, 3, 4 and 5 are the first
These are exactly the same as 1, 2, 3, 4 and 5 shown in the figure, and 8 is exactly the same as 8 shown in FIG. Note that 10 indicates an interface device.

That is, the storage program control automatic switching system of the present invention uses an outgoing trunk 8 dedicated to the crossbar automatic switching system, and has an interface device 10 installed between the trunk 8 and the scanner 5.

As already mentioned in the explanation of FIG. 1, the control device 4 based on the storage program collects connection confirmation information,
The configuration is such that control can be performed once call termination information is obtained. On the other hand, the outgoing relay trunk 8 dedicated to the crossbar automatic exchange has a connection confirmation information function as described above, and is also configured to be able to retrieve call termination information. The details will be described later.

In general, crossbar automatic switching systems use a hardwired logic system, and therefore have more information in the trunk than automatic switching systems using storage program control, which concentrates most of the functions in the software, so information necessary for software control is required. can be taken out. Therefore, by installing the interface device 10 between the trunk 8 and the scanner 5, a trunk dedicated to the crossbar automatic switching system can be used for the storage program control type automatic switching system.

Hereinafter, embodiments of the present invention will be described in detail based on FIGS. 4, 5, and 6.

Figure 4 shows an example of a circuit for an outgoing trunk dedicated to an automatic switching system using storage program control.
1 and B1 are connected to the communication path network, and terminals A2 and B2 are connected to the trunk line. Terminals BT1 and BT2 are connected to the control device 4 by the storage program shown in Fig. 3 from this trunk.
This is a terminal that sends connection confirmation information and call termination information to the
is connected to Sukiyana. Terminals P1 and P2 are terminals for transmitting call information from the control device 4 to the main trunk according to the storage program. To explain this in conjunction with the relay system diagram of FIG. 1, after the access code dialing of the subscriber 2 of FIG. 1 is completed, the control device 4 according to the storage program of FIG. Accordingly, if the trunk is vacant, it autonomously selects this trunk and connects it to the communication path network 1. As a result, the subscriber is connected to terminals A1 and B1 in FIG. 4 via the communication network, and relay A is operated by the subscriber's closed circuit. By closing contact ^a0 , a closed circuit is created between terminals A2 and B2 through wire L, and the other device is activated via the relay wire. In addition, when contact ^a2 is closed, the earth at terminal BT2 is connected to resistor R2 and diode.
RECT and is sent to the scanner via the terminal BT1, the scanner detects this using a known method, and transmits it as connection confirmation information to the control device 4 based on the storage program. On the other hand, a control device 4 based on an accumulation program
In order to indicate that this trunk is busy, first operate the connector relay
A potential is created between 1 and P2. This potential causes current to flow through contact x to relay B during a call, and relay B operates. In this example, a self-holding type is used for relay B, and if the above-mentioned potential is instantaneous, relay B will self-hold. Note that relay B has a characteristic that it can be restored by instantaneously passing a current in the opposite direction to the current direction during operation. After connecting to the call route network, if the subscriber dials, relay A
is intermittent, and contact a ⁰ connects terminals A2 and B2 on the relay line side.
Pulse relay is performed by intermittent closed circuits in between.
It should be noted that during pulse relay, the illustrated relay C operates to disconnect the communication network during pulse relay from the relay line as shown in the figure, and to correct pulse relay distortion, etc., but this method is well known and will not be described here. do.

Next, when the call ends and the subscriber hangs up the handset, relay A is restored. When contact ^a0 is opened, the relay line side is opened. The scanner detects the opening of contact ^a2 and transmits it as call termination information to the control device 4 according to the storage program. When the control device 4 based on the storage program receives the call termination information, it again activates the connector relay
Since it is added instantaneously between 2 and 2, relay B is restored. Subsequently, the control device 4 according to the storage program restores the communication network.

Fig. 5 shows an example of a circuit of an outgoing trunk dedicated to a crossbar automatic exchange as a different switching system, with terminals A1, B1, and C1 connected to the communication path network (crossbar switch in this example), and terminals A2 and B2 connected to a trunk line. Connected. Terminals BT1 and BT2 are terminals that send trunk busy information and connection confirmation information from this trunk to the marker. If there is a closed circuit between terminals BT1 and BT2, it indicates that this trunk is empty, and this closed circuit When the call is disconnected, the connection confirmation information indicates that the call path network has been connected, and the disconnection continues during the call thereafter. Note that terminals BT1 and BT2
When the circuit becomes closed again, the call termination information indicates that the call has ended on this trunk, but the crossbar automatic switch disconnects the crossbar switch holding ground to terminal C1 and autonomously restores the crossbar switch. (publicly known), so this call termination information is not used. To explain this in conjunction with the relay system diagram of FIG. 2, after the access code dialing of the subscriber 7 of FIG. 2 is completed, the marker 9 of FIG. 2 performs a busy test of the outgoing relay trunk 8. Specifically, the fifth
Test the closed circuit of terminals BT1 and BT2 in the figure, and if there is a closed circuit, this trunk is empty and is captured. Next, marker 9 operates the communication path network (crossbar switch), so terminals A1, B1, and C in FIG.
1 and the subscriber are connected. Note that the terminal C1 is a known crossbar switch holding terminal. Relay A is activated by the subscriber's closed circuit. Also contact a ⁰
By closing, a closed circuit is created between the terminals A2 and B2 through the wire L, and the other station is activated via the relay line. In addition, relay B is operated by contact a ¹ , and contact b ⁰
At the same time, by releasing the ground air to terminal C1 and holding the crossbar switch, contact ^b2 is opened to terminal BT.
1. Disconnect the closed circuit of BT2 and send connection confirmation information to the marker. The subsequent pulse relay operation is the fourth one.
It is similar to the figure. When the call ends and the subscriber puts down the handset, relay A is restored. The relay line side is opened by contact a ⁰ , and relay B is restored by opening contact a ¹ . By opening contact ^b0 , the ground air at terminal C1 is cut off and the crossbar switch is restored. Terminal BT1,
In BT2, a closed circuit is formed again when the contacts b ² and c ² are restored. Although the closure of this closed circuit can be call termination information, this information is not used since crossbar switch recovery is performed autonomously from the trunk as described above. In addition, terminals BT1 and BT2
Since the closed circuit continues while the trunk is empty, it is used for subsequent marker trunk busy tests.

FIG. 6 shows a circuit according to an embodiment of the present invention. In the figure, the outgoing trunk (5th
3) is surrounded by a dash-dot line and marked as an interface device, and the portion surrounded by a dash-dot line is the interface device 10 in FIG. Further, as explained in FIG. 5, the functions of the terminals BT1 and BT2 in FIG. 5 are as follows.

(1) Closed circuit closed state… Trunk empty display information (2) Closed circuit disconnected… Call path network connection completion information (3) Closed circuit open state… Trunk busy display information (4) Closed circuit re-established… Call End information "Return to (1)." In addition, as shown in Figure 6, terminal BT2 is connected to the ground, and terminal BT1 is connected to the relay SC of the interface device, so that the information in (4) above is taken out to the relay SC. , contact sc is used in the same way as contact a ² in Fig. 4 to match the electrical conditions with the scanner, and
This constitutes a circuit between terminals BT1 and BT2 of the interface device shown in the figure. Further, this contact sc and the contact ^a2 in FIG. 4 have opposite logic. In the case of the storage program controlled automatic exchange explained in this example, of the information (1) to (4) above, only (2) connection completion information and (4) call termination information are used. Ru. It should be noted that the terminal C1 in FIG. 5 is not used in the case of an automatic exchange using storage program control, since it is unnecessary. In addition, in the storage program controlled automatic switching system of this example, a signal is sent to the terminals P1 and P2 in FIG.
In the case of the crossbar automatic switch shown in the figure, the fifth
Since the relay B shown in the figure is operated and restored by wiring, there is no need to use terminals P1 and P2.

To explain the operation of FIG. 6 in accordance with the relay system diagram of FIG. 3, after the access code dialing of the subscriber 2 of FIG. 3 is completed, the control device 4 according to the storage program of FIG. If the trunk is empty according to the trunk empty/busy information, the main trunk is autonomously selected and connected to the communication path network 1. As a result, terminal A of the outgoing trunk dedicated to the crossbar automatic switch in Figure 6
1, a subscriber is connected to B1 via a communication network,
Relay A shown in Fig. 5 is operated by the subscriber's closed circuit, and the closing of contact ^a0 causes the terminal A to pass through the wire ring L.
A closed circuit is created between 2 and B2, and the other party's device is activated via the relay wire. Also, relay B is connected by contact ^a1.
operates, and terminals BT1 and BT2 are opened by opening contact ^b2 .
Since the closed circuit between them is disconnected, the relay SC of the interface device shown in FIG. 6 is restored. Furthermore, relay SC
is in an empty state and a closed circuit is formed between terminals BT1 and BT2, so it is always operating, so the contact sc is always open. Next, by closing the contact SC due to the restoration of the relay SC, the ground air at the terminal BT2 is sent to the scanner via the resistor R, the diode RECT, and the terminal BT1.The scanner detects this using a known method, and the control device uses the storage program. 4 as connection confirmation information. As shown in Figure 5, relay B operates according to wiring logic and has a slow recovery characteristic, so terminals corresponding to terminals P1 and P2 in Figure 4 are not provided in Figure 6, but are determined by the storage program. Even if the control device 4 side controls the virtual terminals P1 and P2, there will be no problem in the operation. This indicates that there is no need to make any changes to the control device 4 based on the storage program, and is a major feature of the present invention.

Next, when the call ends and the subscriber puts down the handset, relay A in Figure 5 is restored, contact ^a0 is opened to restore the trunk line side, and contact ^a1 is opened to restore relay B.
will be restored. When the contacts b ² and c ² are restored, a closed circuit is reconfigured between the terminals BT1 and BT2 shown in FIG. 5, and thereby the relay SC of the interface device shown in FIG. 6 is reactivated. In addition, the closed circuit of terminals BT1 and BT2 of the interface device is disconnected by opening the contact SC due to relay SC operation, so the scanner detects this and transmits it as call end information to the control device 4 based on the storage program, and controls the communication using the storage program. The device 4 restores the communication path network that receives the call termination information.

As described above, by applying the present invention, it becomes possible to use a storage program control automatic switching system with a different switching system, such as the trunk of a crossbar automatic switching system, with almost no modification (in this embodiment, no modification is required). (without any modifications), the development work efficiency is significantly improved, and high-quality trunks can be used in storage program control type automatic exchanges. Further, as explained in the embodiments, the present invention has many advantages and effects, such as being able to be implemented without changing the control device due to the storage program.

[Brief explanation of the drawing]

FIG. 1 is a relay system diagram of a storage program control type automatic exchange, FIG. 2 is a relay system diagram of a crossbar automatic exchange, and FIG. 3 is a relay system diagram of a storage program control type automatic exchange showing an embodiment of the present invention. Fourth
FIG. 5 is a circuit diagram of an outgoing trunk dedicated to a storage program control automatic switching system, FIG. 5 is a circuit diagram of an outgoing trunk dedicated to a crossbar automatic switching system, and FIG. FIG. 3 is a circuit diagram of an interface device of an exchange. Explanation of symbols, 1...Call network, 2, 7...Subscriber,
3... Outgoing relay trunk dedicated to the storage program control automatic switching system, 4... Control device using the storage program, 5... Scanner, 6... Call path network (crossbar switch in this example), 8... Outgoing trunk trunk dedicated to the crossbar automatic switching system, 9...Common control device (marker),
10...Interface device.

Claims (1)

[Claims] 1. A means for autonomously disconnecting the holding power of the communication path when the communication ends, and an idle call indicating the status of the switching system, in which the setting and opening of the communication path are controlled by a control device based on a storage program. A storage program control system that accommodates a crossbar exchange type trunk having a closed circuit closing/opening means for outputting information or connection confirmation information, and an interface device disposed between a control device based on the storage program and the trunk. In the automatic exchange, the interface device identifies the communication status based on the idle busy information or connection confirmation information output from the trunk, and when it recognizes the termination of the communication, it instructs the control device based on the storage program to terminate the communication. An automatic switching system controlled by a storage program, wherein the storage program control device transmits the information and, when receiving the communication termination information, performs processing to open the communication path.