JP2000022826A - Digital conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital exchange system where the load of a main controller can be reduced and mass data can be transferred between auxiliary controllers. SOLUTION: A main controller 1 sets different time channels in an A controller 5 and a B controller 10 through a TDSW(time dividing switch) control part 4 and TDSW 33. A channel K which is set in the A controller 5 and a channel L which is set in the B controller 10 are connected. Thus, the A controller 5 and the B controller 10 are connected by a time divisional/multiplex PCM transmission line 19, and control data can directly be transferred from the A controller 5 to the B controller 10. Since time divisional/multiplex transmission is realized, the number of used channels can be increased/decreased and a large capacity is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital switching system, and more particularly to a private branch exchange (PBX).
The present invention relates to a digital switching system having a plurality of sub-controllers for providing service functions in the exchange.

[0002]

2. Description of the Related Art Hitherto, data transfer between sub-control units in a digital switching system of this type has been performed via a main control unit.

The data transfer is performed by serial transmission signals,
That is, digital signals transmitted serially one bit at a time have been used.

[0004]

However, since the data transfer between the sub-controllers is performed via the main control unit,
There is a drawback that the load on the main control device becomes heavy.

On the other hand, a technique for performing data transfer using a PCM transmission path without using a serial transmission signal is disclosed in Japanese Patent Laid-Open No. 57-13 / 1982.
No. 2445.

[0006] In this method, data is transferred together with voice through a PCM transmission line by inserting data into the least significant bit of the eight bits of a voice channel.

However, the technique disclosed in this publication has a drawback that only 1-bit data can be transferred through the PCM transmission line.

Therefore, even if this technique is used for data transfer between sub-controllers, it cannot be used on a bus where large-capacity data transfer occurs because the amount of data that can be transferred is small.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital switching system which can reduce the load on a main control unit and can transfer a large amount of data between sub-control units.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a digital switching system in which a plurality of terminals are connected by time division multiplexing. A plurality of sub-controllers for providing functions; and a main control unit for controlling the plurality of sub-controllers, wherein the main control unit has connection means for connecting the plurality of sub-controllers by time division multiplexing. It was configured as follows.

According to the present invention, since the plurality of sub-controllers are connected by time division multiplexing, it is possible to directly transfer data between the sub-controllers by connecting the time channels of the respective sub-controllers. it can.

Further, the data transfer by time division multiplexing can increase or decrease the number of channels to be used and has a larger capacity than the data transfer by a conventional serial signal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a first embodiment of a digital exchange system according to the present invention.

The first embodiment of the digital switching system according to the present invention comprises a main controller 1, an A controller 5,
The B control device 10, the C device 31, the D device 32, and a time-division switch (TDSW)
itch) 33 and k (k is a positive integer) terminals (TE
L) 34k.

This digital switching system is a PBX switching system.

Control data between the A control device 5 and the B control device 10 is a time division switch (hereinafter referred to as TDSW).
33 and the PCM transmission path 19.

On the other hand, audio data is transmitted between the C device 31 and the D device 32 via the TDSW 33 and the PCM transmission line 41.

The audio data is transmitted between the C device 31 and the B control device 10 via the TDSW 33 and the PCM transmission line 41.

The main controller 1 sends a serial signal line 1
7, 18, 42, and 43, the control data are respectively transmitted to the A control device 5, the B control device 10, the C device 31, and the D device 32.
Is transmitted to

The main controller 1 sends a serial signal line 44
Is transmitted to the TDSW 33 via the.

Further, the B control device 10 is connected to a dedicated line for data communication, and the D device 32 is connected to a general line.

With this configuration, main controller 1 can control A controller 5, B controller 10, C device 31, D device 32
And the TDSW 33.

Next, the main part of the present invention will be described in detail. FIG. 2 is a configuration diagram of a main part of the digital switching system according to the present invention. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 2 shows the details of the configurations of the main controller 1, the A controller 5, the B controller 10, and the TDSW 33.

Main controller 1 is a CPU (central processing unit) 2
, An I / O control unit 3 and a TDSW control unit 4.

The CPU 2 outputs an instruction to the A control device 5 and the B control device 10 through the I / O control unit 3.

Further, the CPU 2 makes the TDSW control section 4
The DSW 33 is controlled, and thereby connection between channels is performed.

The I / O control unit 3 controls the A control device 5 and the B control device 10 with serial signals a and b, respectively.

The TDSW control unit 4 controls the PCM transmission with a channel length n (n is an integer; the channel length 1 is, for example, 8 bits, and the transmission rate is, for example, 64 kbps). Controls transmission and reception to and from the device 10.

The A control device 5 includes an I / O interface 6, a TDSW interface 7, an A circuit 8,
PU9.

The B control device 10 includes an I / O interface 11, a TDSW interface 12, and a B circuit 1
3 and a CPU 14.

Since the configurations of the A control device 5 and the B control device 10 are the same, the description will be made with respect to the A control device 5,
A description of the B control device is omitted.

TDSW interface 7 and TDSW3
3 is connected by a PCM transmission line 19.

The I / O interface 6 and the I / O control unit 3 are connected by a serial signal line 17.

The I / O interface 6 decodes a higher-order instruction from the main controller 1 and controls the TDSW interface 7 and the A circuit 8.

The TDSW interface 7 decodes the PCM signal on the PCM transmission line 19 and controls the CPU 9 and the A circuit 8 according to the instruction of the channel n.

The CPU 9 has an I / O interface 6,
The TDSW interface 7 and the A circuit 8 are controlled.

The A circuit 8 is, for example, one or both of a billing information generating circuit for providing a billing information service to the terminal 34k and a voice recording circuit for a voice recording service for recording voice from the terminal 34k. It is composed of

Next, the operation of the first embodiment of the present invention will be described with reference to FIGS. FIG. 3 shows the first
FIG. 4 is a schematic diagram for explaining the operation of the first embodiment, and FIG. 4 is a signal flow chart showing the operation of the first embodiment. In addition,
3, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. Also, in FIG.
Illustration of W33 is omitted for convenience.

Normally, main controller 1 is connected to serial signal line 1
The A control device 5 and the B control device 10 are controlled using the serial signals on 7 and 18.

In the present invention, when the main control device 1 wants the A control device 5 to directly control the B control device 10, it operates according to the following procedure.

Main controller 1 has serial signal lines 17 and 18
Using the above serial signal, channels are initially set on the TDSW of the A control device 5 and the B control device 10 in advance (see S1 and S2 in FIG. 4).

FIG. 5 is a schematic diagram for explaining channel setting. In the initial settings in S1 and S2, the control address and the channel length of the control data in FIG. 5 are set.

Referring to FIG. 5, channel K is set in A control device 5 and channel L is set in B control device 10.

When the main controller 1 causes the A controller 5 to directly control the B controller 10, the A → B control request is transmitted to the A controller 5 and the B controller 10 by serial signals a and b, respectively. (See S3 and S4 in FIG. 4).

When both the control devices 5 and 10 can perform the A → B control, the two control devices 5 and 10 transmit a request permission to the main control device 1 by serial signals a and b (S5 and S6 in FIG. 4). reference).

In the main control device 1 receiving this request permission,
The channel connection between the A control device 5 and the B control device 10 is TD
This is executed by the SW control unit 4 to connect the channel K and the channel L (see S7 in FIG. 4).

After the connection, the main control device 1
The start of A → B control is transmitted to the control device 10 by serial signals a and b (see S8 and S9 in FIG. 4).

The A control device 5 and the B control device 10
After receiving the A → B control start, the A control device 5 controls the B control device 10 (S10).

Next, details of the channel configuration will be described. FIG. 5 shows a channel configuration on a PCM signal of the embodiment.

The synchronization signal 51 shown in FIG.
In the SW control unit 4, the pulse signal is transmitted, for example, every 125 μs.
It has a total of 128 bit channels.

Channel A of channel 0 + 1 is assigned to the A control device 5 and channel 2 + 3c is assigned to the B control device 10.
h channel L is assigned.

The channel K and the channel L each correspond to two channels, and are composed of a total of four channels.

In the TDSW control unit 4 of FIG. 3, channel connection between the A control device 5 and the B control device 10 is performed as follows. That is, the control address channels of the channel K and the channel L are connected, and the control data channels are connected.

Next, the channel format of the TDSW will be described. FIG. 6 is a schematic diagram showing a channel format of the TDSW.

Two channels are used for one control device, and the control device includes a control address channel and a control data channel.

In this case, since the control address has 8 bits, 2 ⁸ = 128 kinds of instructions are possible, and the control data has an 8-bit size.

Further, the number of channels can be increased or decreased, and the control address and the control data can each be, for example, 4 or 16 bits. Further, the control address and the control data can be configured with any other bit size.

Next, a second embodiment of the present invention will be described. FIG. 7 is a configuration diagram of the second embodiment. 2, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. Also, in FIG.
The illustration of 33 is omitted for convenience.

The second embodiment differs from the first embodiment in that E and F controllers 24 and 25 are added to the A and B controllers 5 and 10.

The E and F controllers 24 and 25 and the TDS
The W control units 4 are connected by the PCM transmission line 19 as in the case of the A and B control devices 5 and 10.

FIG. 7 shows that the channel A is assigned to the A controller 5, the channel B is assigned to the B controller 10, the channel E is assigned to the E controller 24, and the channel F is assigned to the F controller 25. I have.

The channels A, B, E and F of the PCM signal are
The channel length or the bit length can be changed, and they are connected by the TDSW control unit 4. In this embodiment, channels A and B of the PCM signal have a 16-bit configuration, and channels E and F have an 8-bit configuration.

The A control device 5 controls the B control device 10. That is, control data is directly transferred from the A control device 5 to the B control device 10. This is similar to FIGS.

A, B, and E control devices 5, 10, 24
Has CPUs 9, 14, and 26, but the F control device 25
Has no CPU. The F control device 25 is controlled by the E control device 24. That is, control data is directly transferred from the E control device 24 to the F control device 25.

In the first and second embodiments, the control device is composed of two control devices A and B, but the control device is composed of two control devices A and B.
It is not limited to this, and the number is arbitrary as long as it is two or more.

[0067]

According to the present invention, there is provided a digital switching system in which a plurality of terminals are connected by time division multiplexing,
The digital switching system includes a plurality of sub-control devices for providing service functions to the plurality of terminals, and a main control device for controlling the plurality of sub-control devices, wherein the main control device includes the plurality of sub-control devices. Since the connecting means for connecting the units by time division multiplexing is provided, the load on the main control unit can be reduced, and a large amount of data can be transferred between the sub control units.

Further, since one of the sub-control devices controls the other to transfer control data, it is not necessary to mount a CPU in the other sub-control device, thereby making it possible to reduce the number of circuits. .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a first embodiment of a digital exchange system according to the present invention.

FIG. 2 is a configuration diagram of a main part of a digital exchange system according to the present invention.

FIG. 3 is a schematic diagram for explaining the operation of the first embodiment.

FIG. 4 is a signal flow chart showing the operation of the first embodiment.

FIG. 5 is a schematic explanatory diagram for explaining channel setting.

FIG. 6 is a schematic diagram showing a channel format of TDSW.

FIG. 7 is a configuration diagram of a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main control device 5 A control device 10 B control device 17, 18 Serial signal line 19 PCM transmission line 24 E control device 25 F control device 33 Time division switch

Continued on the front page F-term (reference) 5K024 AA72 BB00 BB05 BB06 BB10 DD00 DD05 GG00 5K026 AA07 AA21 BB00 CC01 DD03 EE05 FF02 FF06 FF07 FF08 FF09 GG03 GG08 GG12 GG29 LL01 LL03 LL10 5K01 A05 CC04 CC05 DDCC DD04 GG12 HH01 5K069 BA05 CB02 DA01 DA02 DA05 DA06 DB22 FA05 FA13 FA15 FB00 FC03 FD08

Claims (8)

[Claims] 1. A digital switching system in which a plurality of terminals are connected by time division multiplexing, wherein a plurality of sub-controllers providing service functions to the plurality of terminals and the plurality of sub-controllers are controlled. A digital switching system, comprising: a main controller; and the main controller having connection means for connecting the plurality of sub-controllers by time division multiplexing. 2. The connection means comprises channel setting means for setting different time channels for the plurality of sub-controllers, and channel connection means for connecting the time channels of two sub-controllers desiring transfer. 2. The digital switching system according to claim 1, comprising: 3. The digital switching system according to claim 2, wherein said time channel comprises a control address channel indicating a control address and a control data channel indicating control data. 4. The digital communication system according to claim 3, wherein said channel connection means connects said control address channels of said two sub-controllers desiring said transfer and connects said control data channels. Exchange system. 5. The digital switching system according to claim 2, wherein an arbitrary number of bits can be assigned to said time channel. 6. The digital switching system according to claim 1, wherein said digital switching system is a PBX switching system. 7. The digital switching system according to claim 1, wherein said service function is a billing information service. 8. The digital switching system according to claim 1, wherein said service function is a voice recording service.