JPS5939191A - Control signal distributing system - Google Patents

Abstract

PURPOSE:To simplify a digital exchange and to transmit control information at a high speed, by adding an identification code to voice and line control information and selecting either the voice information or the line control information read out from a control memory based on the identification code. CONSTITUTION:The line control information (d) transmitted from the central controller CC to each subscriber circuit LC is stored in a prescribed address L of a control memory CM. Each address of the memory CM is provided with an area storing the identification code (i) in addition to the areas storing the readout address of a channel memory SPM and the information (d). Further, a selecting circuit SEL3 is provided between the memory SPM and a selecting circuit SEL2, and the circuit SEL3 is controlled with the identification code (i) read out together with the read-out address and the information (d) from the memory CM. Then, the voice information read-out from the memory SPM and the line control information read-out from the memory CM are selected with the identification codes (d), (i), allowing to transmit the control information at high speed without reducing the allocated line.

Description

DETAILED DESCRIPTION OF THE INVENTION ta) Technical Field of the Invention The present invention relates to a control signal distribution system, in particular, a method for distributing control signals from a one-stage time division switch having a channel memory and a control memory to a line corresponding section.
This invention relates to a control signal distribution system in a digital exchange that transmits digitized voice information and line control information via a time division multiplex communication path.

lb) Prior Art and Problems FIG. 1 is a diagram showing an example of a conventional control signal distribution system in this type of digital exchange.

In FIG. 1, a one-stage time-division switch TSW divides the differential f-digitized voice information that arrives via a multiplexing circuit MPX from a subscriber circuit LC accommodated as a line corresponding section into a number of hands. The circuit CNT sequentially stores the write address in the communication path memory SPM according to the write address supplied from the control memory CM, and stores the communication path memory S in accordance with the successive addresses supplied from the control memory CM.
The signal is output from the PM and sent to the corresponding subscriber circuit LC via the selection circuit 5EL2, the time division multiplexing path HW and the demultiplexing circuit DMPX. Also, control signal holding memory SSM
is provided independently of the subscriber circuit LC via a selection circuit SEL 2, a time division multiplexing channel HW, and a demultiplexing circuit DMPX after once multiplying the line control information d transmitted from the central control unit CC. The signal distribution device SD sends the received line control information d to the line control information register RE of all subscriber circuits LC.
Distribute to G. The number of signal distribution devices SDO is limited to one to a few in order not to overwhelm the number of accommodated subscriber circuits, and is used by all subscriber circuits LC in a time-sharing manner. Therefore, there is a limit to the transmission speed of the line control information d that can be transmitted by the signal distribution device SD. FIG. 2 is a diagram showing another example of a conventional control signal distribution system.

In FIG. 2, in order to transmit line control information d faster than the above-mentioned limit to the special subscriber circuit SLC accommodated in the address of the multiplexer/demultiplexer circuit DMPX, the multiplexer circuit MPX
A high-speed signal distribution device HSD is accommodated in place of the subscriber circuit LCO accommodated at a predetermined address K of the central control device CC.
high-speed line control information d having the same transmission speed as the voice information transmitted from the communication channel memory SPM is stored at a predetermined address K of the communication path memory SPM, and a subsequent address is stored by the central controller CC at a predetermined address L of the control memory CM. It can be transmitted to the special subscriber circuit 1iSLC designated by K and accommodated at a predetermined address L of the demultiplexer circuit DMPX.

As is clear from the above explanation, in the conventional control signal distribution system, when the line control information d is time-divisionally transmitted to all subscriber circuits LC via the control signal holding memory SSM and the signal distribution device SD, has a limit on transmission speed,
In order to transmit high-speed line control information d that exceeds this limit, a dedicated high-speed signal distribution device H3D is connected to the required number of subscriber circuits 1.
．． It is necessary to accommodate the subscriber circuits in place of C, which has the disadvantage of impairing the economic efficiency of the digital exchange and reducing the number of accommodated subscriber circuits.

(C1 Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional control signal distribution system as described above, without impairing the economic efficiency of the digital exchange, and without reducing the number of accommodated lines.
The object of the present invention is to realize a control signal distribution system capable of transmitting high-speed line control information.

(d) Structure of the Invention This object is to transfer digitized voice information and line control information from a one-stage time division switch having a communication path memory and a control memory to a line corresponding section via a time division multiplex communication path. In the transmitting digital exchange, the following address to which an identification code indicating that the address is a subsequent address in the communication path memory is added, and the line control information to which an identification code indicating that it is line control information is added are stored in the control memory. either the voice information read from the call path memory based on the read response stored in a predetermined area of the control memory or the line control information read from the control memory; This is achieved by providing a selection circuit that selects based on the identification code and sends it to the time division multiplex channel.

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

FIG. 3 is a diagram showing a control signal distribution system according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 3, high-speed line control information d transmitted from the central controller CC to each subscriber circuit LC is stored at a predetermined address L of the control memory CM. Each address of the control memory CM is provided with an area for storing a 1-bit identification code i, in addition to an area for storing the next address of the communication path memory SPM and the high-speed line control information d itself. When storing the successive address in the control memory CM, the central control unit CG adds an identification code i (for example, logical value 0) indicating that it is a successive address, and also stores the high-speed line control information d in the control memory CM. When storing it in the CM, an identification code i (for example, a logical value l) indicating that it is high-speed line control information d is added. Further, a selection circuit 5EL3 is provided between the call path memo IJSPM and the selection circuit 5EL2. The selection circuit 5EL3 is controlled by an identification code i read out from the control memory CM together with a read address and high-speed line control information d,
When the identification code i with the logical value 0 is read out, based on the read address read out at the same time, audio information read out from the speech path memory SPM is selected and transmitted to the selection circuit 5EL2, and the identification code with the logical value l is selected. When the code i is read out, the high speed line control information d read out at the same time is selected and transmitted to the selection circuit 5EL2. The high-speed line control information d transmitted to the selection circuit 5EL2 is transmitted to the special subscriber circuit SLC accommodated at a predetermined address L of the demultiplexing circuit DMPX via the time division multiplexing channel HW.

As is clear from the above description, according to this embodiment, the high-speed line control information d is added with an identification code i' (logical value 1) by the central controller CC, and then addressed to a predetermined address in the control memory CM. stored in L and via the selection circuit 5EL3,
Like the voice information, it is transmitted to the corresponding special subscriber circuit SLC via the time-division multiplexing channel HW. Therefore, the same high-speed line control information d as the voice information can be transmitted, and there is no need to accommodate the required number of high-speed signal distribution devices HSD in the multiplexing circuit MPX, as shown in FIG.

Note that FIG. 3 is only one embodiment of the present invention, and for example, the line corresponding section is not limited to the subscriber circuit LC, and many modifications to the trunk circuit etc. may be considered, but any Even in this case, the effects of the present invention remain the same. Furthermore, the configurations of the one-stage time division switch TSW and the subscriber circuit LC are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention will not be affected in any case. It doesn't change.

(f) Effects of the Invention According to the present invention, a control signal distribution method is provided in the digital exchange that can transmit high-speed line control information without impairing economic efficiency or reducing the number of accommodated lines. It can be realized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional control signal distribution method, FIG. 2 is a diagram showing another example of a conventional control signal distribution method,
FIG. 3 is a diagram showing a control signal distribution system according to an embodiment of the present invention. In the figure, 'r s w is a one-stage time division switch, LC
is a subscriber circuit, SLC is a special subscriber circuit, MPX is a multiplexing circuit, DMPX is a demultiplexing circuit, S)) M is a channel memory, CM is a control memory, SSM is a control signal holding memory, CNT is a counting circuit, 5EL1.5EL2 and 5E
L3 is a selection circuit, REG is a line control information register, SD
is a signal distribution device, [ISD is a high-speed signal distribution device, C
C is the central control unit, d is the line control information, i is the identification code,
K and L indicate addresses. CC Ya I Figure 5W CC/ Figure 2 SW Figure 3

Claims (1)

[Claims] In a digital exchange that transmits digitized voice information and line control information from a one-stage time division switch having a communication path memory and a control memory to a line corresponding section via a time division multiplex communication path, the communication path The successive address to which an identification code indicating that it is a successive address of the memory is added, and the line control information to which an identification code indicating that it is line control information are added are stored in a predetermined area of the control memory, Based on the successive address read from memory, either the voice information read from the communication path memory or the line control information read from the control memory is selected based on the identification code, and the time division multiplexing is performed. A signal distribution system characterized by providing a selection circuit for sending out signals to a communication path.