JPS6228916B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching system for a time-sharing telephone exchange.

A conventional telephone exchange has a configuration as shown in FIG. 1, for example. That is, in the figure, 10 is an incoming line trunk group, 12 is an outgoing line trunk group, and 14 is an outgoing line trunk group.
a, 14b are digital-analog (analog-digital) converters, 16 is a main switch network, 18 is a main switch network control circuit, 20 is a signal sending trunk group, 22 is a signal receiving trunk group, 24a, 24b
2 indicates a trunk control circuit, and 26 indicates a central control unit.

In such a conventional configuration, when a call occurs on the accommodating line, a plurality of signals are transmitted that are necessary for the call connection process, and the receiving trunks 20 and 22 and the line where the call originates connect the lines to each other. Main switch network 1
6, and information transmission and reception for call processing is performed. Once the call setup is complete, the call is
The lines accommodating the called party are connected to each other via the main switch network 16, and a call is started. When the call ends, post-processing is performed to connect the line and each trunk via the main switch network 16 and restore the line. Therefore, according to the conventional method, it is necessary to reconnect the main switch network multiple times when a call occurs, making the control extremely complicated, and when adding lines or changing the signal method used up to that point. When adding and using a different line signaling system, it is necessary to change the main switch network, which is the main component of the exchange, and the hardware and software of the control processing unit such as the central control unit that controls the main switch network. It was necessary to do it.

Therefore, the present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a system that has great flexibility in adding lines, changing or adding signal systems, and is simple in configuration and control. The purpose is to provide a new exchange method.

A feature of the present invention that achieves the above-mentioned object is that, in a trunk group accommodating multiple lines, an auxiliary switch network separate from the main switch network that interconnects the lines, trunks for call connection processing, and signal processing for these are provided. and when a call occurs on the accommodating line, the call line is connected to the call connection processing trunk via the auxiliary switch network and the call setting process is performed within the trunk group, and the main Only line connection information is transferred between the processing device that controls the switch network and the signal processing device of the line where the call originates, and the main switch network connects the lines that accommodate the calling and called calls respectively. The reason lies in the fact that only the The present invention will be explained in detail below with reference to Examples.

FIG. 2 is a block diagram showing a schematic configuration of a time division type switching system as an embodiment of the present invention. In the figure, 28 is a group of incoming line trunks for detecting selection signals, monitoring signals, etc. from the previous station;
0 is a group of outgoing line trunks that send out selection signals, monitoring signals, etc. to subsequent stations, and 32a and 32b are analog
A group of analog-to-digital (digital-to-analog) converters that perform PCM conversion; 34 is a time-division main switch network; 36a and 36b are, for example, TSCN (trunk scanning device), SD (signal distribution device), RC (relay drive device); ) etc. trunk control circuit, 38a, 3
8b is a small capacity time-sharing auxiliary switch network; 40a;
40b is a trunk group for call connection processing necessary in the connection process, such as an MF (multi-frequency signal) transmission/reception trunk, a DT (dialing tone) transmission/reception trunk, an RBT (ringing tone) transmission trunk, etc.; 42a and 42b are trunk groups 40a, 42b, respectively; Control device for 40b, 44a, 4
4b is a signal processing device; 46 is a control circuit for the main switch network 34; 48 is a processing device for controlling the main switch network;
Reference numeral 50 indicates a central control unit, reference numerals 52 and 54 indicate metallic return incoming and outgoing line groups, and 56a and 56b indicate input and output time division multiplex highways to the main switch network 34, respectively.

Next, in the switching operation of this embodiment, when a call is generated on the incoming line _52-1 of the LM system using a multi-frequency code in the selection signal, this line is transferred to the outgoing line 54 of the LM system.
The case of connecting to _-1 will be explained.

When an activation signal is sent to the incoming line _52-1 from the preceding station, the incoming line trunk _28-1 detects the activation signal and sends an activation completion signal to the preceding station. The signal processing device 44a is the trunk control circuit 3
When this activation is known through the call connection processing trunk group 40a, an empty MF receiving trunk 4 is selected from the call connection processing trunk group 40a.
0a _-1 , and connects the path between this MF reception trunk 40a _-1 and the incoming line 52 _-1 via the analog-to-digital converter 32a _-1 in which this incoming line is accommodated and the time division multiplex highway 56a. It is set to go through the divided auxiliary switch network 38a. When a path between the incoming line 52 _-1 and the MF reception trunk 40a _-1 is set, the signal processing device 44a generates an IRT (incoming register trunk) capture signal via the trunk control circuit 36a and the incoming line trunk 28 _-1 . (off signal) is sent to the previous station. Next, a KP signal (cligent sign) is sent from the previous station to confirm reception operation.
When the KP signal is sent, this KP signal is received by the MF receiving trunk 40a _-1 via the path of the analog-to-digital converter 32a _-1 and the auxiliary switch network 38a. When the signal processing device 44a learns of this KP signal reception via the trunk control device 42a,
An IRT capture completion signal (ON signal) is sent from the incoming line trunk 28 _-1 to the preceding station via the trunk control circuit 36a.

Following the above operations, when the MF selection signal is sent from the previous station, this selection signal is sent to the analog-to-digital converter 32a _-1 and the auxiliary switch network 38a.
The information such as called party information is received by the MF receiving trunk 40a _-1 via the path of the trunk controller 4.
2a to the signal processing device 44a. Thereby, the signal processing device 44a notifies the central control device 50 of calling party information, called party information, etc.
Based on the obtained called party information, the central control unit 50 notifies the called party number and other information to the signal processing unit 44b in which the called party's line is accommodated.
Based on the obtained information, the signal processing device 44b controls the trunk control circuit 36b for the outgoing line trunk _30-1 corresponding to the outgoing line _54-1 where the called party is accommodated.
A command is given through the terminal to cause the downstream station to send a start signal. The signal processing device 44b further includes an outgoing line 54.
_-1 accommodated time division multiplex highway 56b
and the empty trunk group 40b for call connection processing.
The time division auxiliary switch network 38b is controlled to establish a path to connect the MF sending trunk 40b _-1 .

The start-up completion signal and IRT capture signal from the downstream station are received by the outgoing line trunk _30-1 , and this reception is sent to the signal processing device 44b via the trunk control circuit 36b.
When the signal processor 44b recognizes the MF sending trunk 40 via the trunk controller 42b,
b _-1 , auxiliary switch network 38b, highway 56b, digital-to-analog converter 32
The KP signal is sent to the downstream station via the path b _-1 and the output line 54 _-1 . Upon receiving the IRT acquisition completion signal from the downstream station via the outgoing line trunk 30 _-1 and the trunk control circuit 36b, the signal processing device 44b
The called party number given from the central control device 50 is given to the MF sending trunk 40b _-1 via the trunk control device 42b, and a selection signal is sent to this trunk 40b _-1 .
The data is sent to the subsequent station via the auxiliary switch network 38b, the digital-to-analog converter 32b _-1 , and the outgoing line trunk _30-1 . When the transmission of the selection signal is completed, the signal processing device 44b switches to the auxiliary switch network 38b.
The outgoing line _54-1 is connected to the trunk that receives RBT (ring tone) and BT (busy tone) from the trunk group 40b for call connection processing by controlling the trunk group 40b for call connection processing, and receives an audible signal from the subsequent station. enter the state.

If the called party is empty and an RBT is sent from the downstream station, the signal processing device 44b transmits the aforementioned RBT.
It learns that it is being called through the receiving trunk and trunk control device 42b, and sends the calling party number, information that it is being called, etc. to the signal processing device 44a via the central control device 50. Signal processing device 4
4a receives this information, finds an empty RBT sending trunk from among the call connection processing trunk group 40a, and controls the auxiliary switch network 38a to connect this RBT sending trunk, the auxiliary switch network 38a, and the digital-to-analog Conversion device 32
a _-1 , RBT via the path of ingress trunk 28 _-1
is sent to the caller.

When there is a response from the downstream station, the outgoing line trunk 30
_-1 , the signal processing device 44b learns of this response via the trunk control circuit 36b, and thus the signal processing device 44b sends information such as the called party number and the response to the central control device 50, and also sends information such as the called party number and the response to the central control device 50. The aforementioned path of network 38b is released.

When the central control unit 50 receives the above information, it sends information such as a calling party number response to the signal processing unit 44a, and also sends information such as a calling party number response to the main switch network control processing unit 48 to accommodate the calling party and the called party. Sends the terminal number (highway number and channel number). As a result, the processing device 48 controls the main switch network 34 via the control circuit 46, and sets a communication path within the main switch network. On the other hand, the signal processing device 44a communicates via the trunk control device 42a.
It controls the RBT transmission trunk and stops the transmission of RBT and opens the path of the auxiliary switch network 38a.

Through the above operations, a communication path is set between the line 52 _-1 and the line 54 _-1 , and a communication state is established.

When a disconnection signal comes from the previous station, the signal processing device 4
4a learns of this disconnection via the incoming trunk _28-1 and trunk control circuit 36a, and conversely enters into a recovery process via the trunk control circuit 36a and trunk _28-1 , and informs the central controller 50 that the calling party Sends information such as number and disconnection. This results in
The central control device 50 sends information such as the called party number and disconnection to the signal processing device 44b, and further sends information about the terminal number and path opening to the main switch network control processing circuit 48. Based on this information, the processing circuit 48 releases the communication path of the main switch network 34 via the control circuit 46. Furthermore, the signal processing device 44b sends a disconnection signal from the trunk _30-1 to the subsequent station via the trunk control circuit 36b, and thereafter performs recovery processing independently.

As described above, in this embodiment, the physical level processing that depends on the line signaling system is performed within the trunk group provided corresponding to the line, and the main switch network and the processing device of the main switch network Only a simple line connection is made between the central control unit and other processing units, and only logical level processing is performed between the central control unit and other processing units.
Therefore, when different line signaling systems are combined, or when a new line signaling system is added, for example, in this embodiment it is an LM line, but it is also possible to combine LD lines, SR lines, subscriber lines via an aggregation stage, etc. Alternatively, even if a new switch is added, the main switch network, central control unit, etc. can be used in common without making any physical changes. That is, it is possible to provide an exchange with excellent control, configuration, expandability, and universality.

In the above embodiment, an auxiliary switch network, a trunk group for call connection processing, a trunk control device, and a signal processing device are provided separately for the incoming line and the outgoing line, but only one set of these is provided,
It may be possible to share it between input and output lines. In this case, the flow of information between the signal processing devices via the central control device is eliminated, so the burden on the central control device is reduced. Conversely, by reducing the capacity of the signal processing device and auxiliary switch network, a trunk control circuit, an auxiliary switch network, a trunk group for call connection processing, a trunk control device, It is also possible to have a configuration in which a signal processing device and a signal processing device are provided. It is also possible to adopt a configuration in which the central control device and the main switch network control processing circuit are shared. It is clear that various configurations of the main switch network can be applied in addition to the above-described embodiments.

As explained in detail above, according to the system of the present invention, the auxiliary switch network provided in a trunk group accommodating multiple lines, its processing device, and the trunk for call connection processing depend on the line signaling system. All the connection processing is performed, and the main switch network and the processing device that controls it are made to perform only the connection processing of the communication path between two lines, which does not depend on the signaling system.
Even if the signal system is changed or added, there is no need to change the main parts such as the main switch network or the central control unit, and this provides the excellent convenience of extremely high flexibility and expandability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional exchange, and FIG. 2 is a block diagram of an embodiment of the present invention. 28... Incoming line trunk group, 30... Outgoing line trunk group, 32a, 32b... Analog-digital converter group, 34... Main switch network, 36a,
36b... Trunk control circuit, 38a, 38b...
...Auxiliary switch network, 40a, 40b...Trunk group for call connection processing, 42a, 42b...Trunk control device, 44a, 44b...Signal processing device, 46
...Control circuit, 48...Main switch network control processing circuit, 50...Central control unit, 52...Input line group, 54...Output line group, 56a, 56b...Highway.

Claims (1)

[Claims] 1. In a time division switch, an auxiliary switch network separate from the main switch network that connects the lines, trunks for call connection processing, and signal processing equipment for these are provided and accommodated in a trunk group that accommodates multiple lines. When a call occurs on a line, the call line is connected to the call connection processing trunk via the auxiliary switch network, the call setting process is performed within the trunk group, and the main switch network is controlled. Only line connection information is transferred between the device and the signal processing device of the line where the call has occurred, and the main switch network is configured to connect only the lines that accommodate the calling and called calls respectively. An exchange method characterized by the following.