JPS6325756B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a switching connection processing system in a distributed controlled time division switch. FIG. 1 is a block diagram showing an example of the configuration of a distributed control type time division switch. In the same figure, the exchange E _x
are terminals 10 ₁ , 10 _o and terminals 11 ₁ , 11 _n
are interface devices 10 and 11, respectively.
It is connected via an interface device 20 to trunks 20 ₁ and 20 _k that accommodate the switch and connect it to other exchanges. Each interface device 10,1
1 and 20 are time division communication path 1 and communication highway 1
00, and the central control device 2 is connected to the control devices 10 _c , 11 _c , 2 in each interface device.
_0c and a system bus 101. Further, the time division communication path 1 has a control line 102.
It is controlled by the central control device 2 via. Figure 2 shows an example of a signal sequence between an exchange and a terminal in terminal interconnection, and the signals exchanged between exchange terminals include a monitoring signal (in Figure 2, S _i1 , S _i2 ,
S _i3 , S _j1 , S _j2 , S _j3 ) and other signals (hereinafter referred to as connection control signals. In Fig. 2, C ₁₁ , C ₁₂ , C ₁₃ ,
C ₁₄ , C ₂₁ , C ₃₁ , C ₃₂ , C ₃₃ , C ₃₄ ).
The following table shows the signal names and their meanings.

【table】

[Table] By the way, in conventional distributed control type time division switching equipment that performs the above switching connection processing, the monitoring function for receiving monitoring signals and the signal transmitting and receiving function for transmitting and receiving connection control signals are arranged corresponding to the terminals. The configuration is as shown in Figure 3. That is, in FIG. 3, the same symbols as in FIG. 1 indicate the same parts, and 1
0 _f and 11 _f are demultiplexing circuits, K _Ti and K _Tj are monitoring circuits for the originating terminal, CH _Ti and CH _Tj are signal transmission/reception circuits with the originating terminal, I _Ti and I _Tj are insertion circuits for the originating terminal, and G _i and G _j are gate circuits, and terminals 10 _i and 11 _j are respectively interface devices 1 that accommodate the terminals.
0 or 11, and transmission and reception of connection control signals with the terminal is also executed by the interface device. FIG. 4 is a signal sequence diagram illustrating the flow of information between each block in the configuration of FIG. explain. In FIG. 3, when the terminal 10 _i makes a call,
The control device 10 _c in the interface device 10 receives the call request signal S _i1 from the monitoring circuit K _Ti , and sends the call analysis request signal p ₁ along with caller information to the system bus 101 in order to confirm whether or not the call is possible. The data is sent to the central control device 2 via the host computer. The central control device 2 performs analysis based on the caller information and returns the result to the control device _10c as _a call analysis response signal p2. The control device 10 _c sends a selection signal sending enable signal C ₁₁ to the terminal 10 _i through the signal transmitting/receiving circuit CH _Ti . Thereafter, the control device _10c transmits the selection signal _C21 to the signal transmitting and receiving circuit.
When received via CH _Ti , it sends a numeric analysis request signal p ₃ together with the received selection signal to the central control unit 2 in order to identify the destination. Central control device 2
analyzes the selection signal, controls the time division communication path 1 via the control line 102, sets a communication path, and sends the communication to the interface device 11 in which the destination terminal is accommodated via the system bus 101. An incoming call request signal _p4 is sent along with the accommodation location of the called terminal. The interface device 11 receives the incoming call request signal.
p ₄ is received, and the signal transmitting/receiving circuit CH _Tj sends an incoming call signal C ₃₁ to the terminal 11 _j . Terminal 11 _j is
When an incoming call acceptance signal S _j1 is sent in response, the interface device 11 receives it via the monitoring circuit K _Tj and sends an incoming call response signal p ₆ to the interface device 10 via the system bus 101. Also,
The control device 11 _c sends the originating ID signal C ₃₂ to the terminal 11 j, and after completion of sending, the control device 11 _c sends the originating ID sending completion signal p ₇ to the interface device 10, and also sends the originating ID signal C 32 to the gate circuit G _j and the insertion circuit I _Tj. to connect the time division communication path 1 and the terminal _11j . On the other hand, the control device 10 of the interface device 10
When _c receives the incoming call response signal p ₆ , terminal 10 _i
The destination ID signal _C12 is sent to the destination. Further, upon receiving the caller ID transmission completion signal _p7 , the gate circuit G _i and the insertion circuit I _Ti are switched to connect the terminal 10 _i and the time division communication path 1. As a result, the terminals are connected to each other and enter a communicating state. In the communicating state, the terminals 10 _i and 11 _j are connected to the monitoring circuit K _Ti of the interface device 10, respectively.
and is constantly monitored by the monitoring circuit K _Tj of the interface device 11. When the control device 11 _c receives the recovery request signal S _j2 from the terminal 11 _j via the monitoring circuit K _Tj , it sends the recovery request signal p ₁₁ to the interface device 10, and also sends the recovery request signal p 11 to the gate circuit G _j and the insertion circuit I _Tj. , restore the original state, and switch to terminal 1.
_1j , a recovery confirmation signal C ₃₃ and a ready signal C ₃₄ are sent out from the signal transmitting/receiving circuit CH _Tj . Also, terminal 1
1 When _j recovers and returns the destination terminal ready signal S _j3 , it sends the destination terminal recovery notification signal p ₁₄ to the central controller 2.
Send out. On the other hand, when the control device _10c of the interface device 10 receives the recovery request signal _p11 ,
The gate circuit G _i and the insertion circuit I _Ti are switched, and a disconnection instruction signal C ₁₃ is sent to the terminal 10 _i , and a communication path restoration request signal p ₁₂ is sent to the central control unit 2.
When the central control unit 2 receives the communication path restoration request signal _p12 , it controls the time division communication path 1 and restores the communication path. Furthermore, upon receiving the disconnection confirmation signal S _i2 from the terminal 10 _i , the control device 10 _c transmits a ready signal C ₁₄
is sent back to terminal _10i . When the terminal returns the originating terminal ready signal S _i3 , the control device 10 _c sends the originating terminal recovery signal p ₁₃ to the central control device 2. As explained above, all signal transmission and reception between interface devices is performed via the system bus, which increases the amount of communication on the system bus. Since monitoring is performed by an interface device, conflicts in exchange processing often occur due to differences in the detection times of state changes at both the originating and receiving terminals, and invalid processing is therefore performed. The present invention improves these conventional drawbacks, and its purpose is to minimize the difference in detection time of state changes between the originating and receiving terminals, and to reduce conflicts in switching connection processing caused by this. . Another object of the present invention is to reduce the amount of communication on the system bus. Examples will be described in detail below. FIG. 5 is a block diagram of main parts showing an example of a distributed control type time-division switching system implementing the method of the present invention. The same reference numerals as _{in FIG} .
K _Nj is a monitoring circuit of the destination terminal, and terminals 10 _i , 1
The monitoring circuits K _{Ni and} K _Nj are connected to the outputs from the multiplexing and demultiplexing circuits 10 _f and 11 _f , respectively, corresponding to the number of demultiplexing circuits 10 f and 11 f. Furthermore, FIG. 6 shows the signal flow between each block in the configuration of FIG. 5 when the sequence of FIG. do. When the terminal _10i makes a call and the incoming call request signal p4 is sent via the system bus 101 to the interface device 11 in which the called terminal is accommodated in the same way as in the conventional method explained in FIGS. 3 and ₄ . , control device 11
_C sends an incoming call signal C ₃₁ to the destination terminal 11 _j and closes the gate circuit G _j so that the signal from the terminal 11 _j is transmitted to the time division communication path 1. The terminal 11
_j responds and sends back an incoming call acceptance signal S _j1 , this signal S _j1 is sent to the monitoring circuit K _Ni of the interface device 10.
It can be detected by Therefore, the conventional system bus 1
01, the time required for the control device _10c to detect a response is shortened compared to the case where the interface device 10 on the originating side receives the incoming call response signal _p6 via the signal p6. When the control device _10c receives the incoming call acceptance signal _Sj1 , it sends out an incoming ID signal _C12 to the terminal _10i , and
A sender ID signal sending instruction signal _p9 is sent to the interface device 11 via the system bus 101. When the control device _11c of the interface device 11 receives the sender ID signal transmission instruction signal _p9 , the control device 11c sends the sender ID to the terminal _11j.
Send signal C ₃₂ to interface device 10.
Returns ID sending completion signal _p7 . Furthermore, the insertion circuit I _Tj is switched so that the signal from the communication highway 100 is sent to the terminal 11 _j . When the control device _10c of the interface device 10 receives the sender ID sending completion signal _p7 , the gate circuit Gi _and the insertion circuit
Switch I _Ti to terminal 10 _i and call highway 10
Connect 0. As a result, the terminals are connected to each other,
The state is in communication. During communication, the interface device 10 constantly monitors the terminals 10 _i and 11 _j . Terminal 11 _j
sends out the recovery request signal S _j2 , the interface device 10 detects it with the monitoring circuit K _Ni and sends out the gate circuit G _i
Then, it restores the insertion circuit I _Ti and sends a restoration request signal p ₁₁ to the interface device 11 via the system bus 101. It also sends a communication path restoration request signal _p12 to the central control device 2. Thereafter, operations similar to those in FIGS. 3 and 4 are performed. In this configuration example, since changes in the status of the destination terminal are monitored by the originating terminal interface device via the time-division communication path, compared to the conventional system bus, Changes in the status of both terminals can be detected more quickly, and conflicts in switching connection processing caused by changes in the status of both originating and receiving terminals can be reduced. FIG. 7 is a block diagram of main parts showing another example of a distributed control type time division switch implementing the method of the present invention.
The same symbols as in FIG. 5 indicate the same parts, CH _Ni ,
CH _Nj is a signal transmission/reception circuit with the destination terminal, I _{Ni and} I _Nj are circuits inserted into the destination terminal, and monitoring circuits are installed at the outputs of the demultiplexing circuits 10 _f and 11 _f corresponding to the terminals 10 i and 11 _j .
K _Ni , K _Nj and signal transmitting/receiving circuits CH _Ni , CH _Nj are connected, and insertion circuits I _Ni , I _Nj are further connected to inputs of multiplexing/demultiplexing circuits 10 and 11, and signals from terminals 10 _i and 11 _j are connected. and the output from the signal transmitting/receiving circuits CH _Ni and CH _Nj . FIG. 8 shows the signal flow between the blocks realizing the signal sequence shown in FIG. 2 in the configuration shown in FIG. 7, and the operation of this embodiment will be explained below with reference to the same figure. . When the terminal _10i makes a call and the incoming call request signal _p4 is sent via the system bus 101 to the interface device 11 in which the destination terminal is accommodated as in the conventional system, the control device _11c calls the insertion circuit I. _Tj and I _Nj , connect the destination terminal 11 _j and time division communication path 1,
A connection completion signal _p8 is sent back to the interface device 10. Control device 10 _c of interface device 10
sends an incoming call signal C ₃₁ to the destination terminal 11 _j by the signal transmitting/receiving circuit CH _Ni , and when the terminal 11 _j responds and returns an incoming call acceptance signal S _j1 , the control device 10 _c
is detected by the monitoring circuit K _Ni , and terminals 10 _i and 1
1 _j , the called ID signal C ₁₂ and the calling ID signal respectively.
C ₃₂ into the signal transmitter/receiver circuits CH _Ti and CH _Ni , respectively
Send from Furthermore, the insertion circuits I _Ti and I _Ni are switched to connect the terminal 10 _i and the time division communication path 1. As a result, the terminals are connected to each other and enter a talking state. In the busy state, both terminals 10 _i and 11 _j are monitored by the interface device 10, and the operation after receiving the recovery request signal S _j2 from the terminal 11 _j is the same as in the previous embodiment. In this configuration example, since changes in the status of the destination terminal are monitored by the originating terminal interface device via the time-sharing communication path, the terminal status is monitored by the originating terminal interface device via the time-sharing communication path. This makes it possible to detect changes in the originating and receiving terminals more quickly, reducing contention in exchange connection processing due to the detection of state changes at both the originating and terminating terminals, and also making it possible to exchange signals with the terminating terminal from the signal transmitting/receiving circuit of the interface device that accommodates the originating terminal. Therefore, the number of system bus signals is reduced compared to the conventional method. As can be seen from the above description, according to the present invention,
After setting a call path for a time-division call path, the called terminal is connected to the called terminal monitoring circuit provided on the calling terminal side via the call path, and changes in the status of the called terminal are monitored via the time-shared call path to the calling terminal interface. Because it is monitored by a device, it is faster to detect changes in the status of both originating and receiving terminals than when detecting via the conventional system bus, and it is possible to reduce conflicts in exchange connection processing due to the detection of status changes on both originating and receiving terminals. . In addition, if it is connected to the signal transmission/reception circuit for the destination terminal provided on the originating terminal side,
Since signals can be exchanged with the destination terminal from the signal transmitting/receiving circuit of the interface device that accommodates the originating terminal, the number of signals on the system bus is reduced compared to the conventional system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of a distributed control type time division switch; FIG. 2 is a diagram showing an example of a signal sequence between a switch and a terminal in terminal interconnection;
FIG. 3 is a block diagram of a device implementing a conventional distributed control type time-division switching system. 5 and 7 are main block diagrams showing different embodiments of the apparatus implementing the system of the present invention, and FIG. 6 shows the signal sequence between the exchange and the terminal when terminals are interconnected in the embodiment of FIG. 5. FIG. 8 is a diagram showing an example of a signal sequence between an exchange and a terminal when terminals are interconnected in the embodiment of FIG. 7. _Ex ... exchange, 1... time division communication path, 2... central control unit, 10, 11, 20... interface device, 10 _f , 11 _f ... demultiplexing circuit, 10 _c , 11 _c ,
20 _c ...control device, K _Ti , K _Tj ...monitoring circuit of originating terminal,
K _Ni , K _Nj ...Monitoring circuit for the destination terminal, CH _Ti , CH _Tj ...Signal transmission/reception circuit with the originating terminal, CH _Ni , CH _Nj ...Signal transmission/reception circuit with the destination terminal, G _i , G _j ...Gate circuit, I _Ti ,
I _Tj ...Insertion circuit to the originating terminal, I _Ni , I _Nj ...Insertion circuit to the destination terminal, 10 ₁ , 10 _i , 10 _o , 11 ₁ , 11 _j ,
11 _n ...terminal, 20 ₁ ,20 _k ...trunk, 100
...Call highway, 101...System bus, 10
2...Control line.

Claims (1)

[Scope of Claims] 1 Consists of a time division communication path, an interface device connected to the time division communication path and connecting a plurality of terminals or trunks, and a central control device that controls the entire exchange, and each interface device In a distributed control type time-division switching system in which exchange connection processing is distributed and controlled by a control device within the interface device and the central control device, each interface device includes a signal transmitting/receiving circuit for the originating terminal and a signal transmitting/receiving circuit for transmitting and receiving signals with the originating terminal. A calling terminal monitoring circuit for receiving a monitoring signal from a terminal and a receiving terminal monitoring circuit for receiving a monitoring signal from a terminating terminal are provided for each terminal, and after setting a call path for the time-division call path, a calling terminal monitoring circuit for receiving a monitoring signal from a terminal is provided. The terminating terminal is connected to the terminating terminal monitoring circuit on the originating terminal side, and exchange connection control is performed by passing a part of the monitoring signal in addition to the call signal within the time-division communication path. Distributed controlled time division switching system. 2 Consists of a time-division communication path, an interface device connected to the time-division communication path and connecting a plurality of terminals or trunks, and a central control device that controls the entire exchange. In a distributed control type time division switching system in which exchange connection processing is distributed and controlled by a central controller, each interface device includes a signal transmitting/receiving circuit for the originating terminal, which sends and receives signals to and from the originating terminal, and a monitoring signal from the originating terminal. A calling terminal monitoring circuit for receiving signals, a receiving terminal monitoring circuit for receiving monitoring signals from a receiving terminal, and a signal transmitting/receiving circuit for the receiving terminal for transmitting and receiving signals with the receiving terminal are provided for each terminal, and the time-division communication path is After setting a call path, the called terminal is connected to the called terminal monitoring circuit and the called terminal signal transmitting/receiving circuit on the calling terminal side via the call path, and the time-division call path is used to transmit call signals and some other signals. A distributed control time division switching system characterized in that switching connection control is performed by passing a monitoring signal and a connection control signal.