JPH06189356A - Digital pbx - Google Patents

Abstract

PURPOSE:To save number of redundant circuit components and to simplify wiring between a CPU and a controlled device by using a command data storage register and a control data write register in common for subscriber trunks. CONSTITUTION:A command data read switch 3 provided in subscriber trunks ST1, ST2 switches in-premises subscriber terminal equipments TE1, TE2 and a command data storage register 13. Furthermore, a control data write switch 4 in interlocking with the switch 3 switches a control data write register 14 and the terminal equipments TE1, TE2. The switches 3, 4 are sequentially operated by the scanning of polling sequence of a CPU 20 and the CPU 20 decodes a command in response to the presence of the content of the switched registers 13, 14 to process traffic for incoming and outgoing calls or the like. Through the constitution above, the digital PBX 1 is realized in which number of redundant circuit components is reduced and the inter-wiring between the CPU 20 and the controlled device is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital PBX, and particularly to an on-hook, off-hook provided on a subscriber trunk so as to be suitable for a small-scale exchange with low traffic.
The command data storage register for storing command data such as PB signals and the control data write register for writing control data for controlling the subscriber terminal on the premises are removed, and the command data storage register and the control data write register are added to the subscriber. Digital P shared by trunks
Regarding BX.

[0002]

Prior Art and Problems to be Solved by the Invention
As shown in FIG. 2, the digital PBX 31 has
End TE₁₁, TE ₁₂, ..., Subscriber trunk ST₁₁, S
T₁₂..... Digital line network EX₂, On the premises
Subscriber terminal / subscriber trunk synchronization circuit 39 and CPU 4
0 consists of a subscriber trunk ST₁₁No voice code call
Path 32, command data storage register 33 and control data
A data writing register 34 is provided.

[0003] premises subscriber terminal TE ₁₁ is connected to the home line L _11, home line L ₁₁ is connected to the audio code communication path 32, the command data storage register 33 and the control data writing register 34 of the subscriber trunk ST ₁₁ ing. The voice code communication path 32 of the subscriber trunk ST ₁₁ is accommodated in the digital line network EX ₂ and converts the voice code ping-pong-transmitted with the local subscriber terminal TE ₁₁ into an up / down voice code.

The other end of the command data storage register 33, one end of which is connected to the domestic line L ₁₁ , is connected to the serial / parallel bus 36, and the control side of the command data storage register 33 is a local subscriber terminal / subscriber trunk synchronization. It is connected to the circuit 39. The other end of the control data write register 34, one end of which is connected to the domestic line L ₁₁ , is connected to the parallel / serial bus 35, and the control side of the control data write register 34 is a local subscriber terminal / subscriber trunk. It is connected to the synchronization circuit 39.

In addition, the digital line network EX₂
And digital line network EX₂Housed in
The CPU 40 that controls the service sound trunk 38 has a serial
Bus for parallel / parallel 36 and bus for parallel / serial
35 is connected. Digital PBX 31 having the above configuration
On-premises subscriber terminal TE₁₁Off hook, this state
The change is the local subscriber terminal / subscriber trunk synchronization circuit 39.
Accumulates in command data accumulation register 33 according to control
To be done. CPU 40 uses serial / parallel bus 36
Since it is scanned by a polling sequence, it is a local subscriber.
Terminal TE ₁₁The off-hook state change of the CPU40
The dial tone is decoded and the dial tone is output from the service tone trunk 38.
Rurain Network EX₂Subscriber trunk S via
T_{1 1}Is sent to the voice code communication path 32. Premises subscriber end
End TE₁₁When the PB signal is sent by
The state change was decoded by the CPU 40 and corresponded to the PB signal.
Subscriber trunk ST₁₂Is selected in the program logic
It Digital line network EX₂Channel
When the call is canceled, the ring tone is received from the service tone trunk 38.
Tarline Network EX₂Subscriber trunk through
ST₁₂Is sent to the voice code communication path 32. Also, CP
U40 is a subscriber via the parallel / serial bus 35
Trunk ST₁₂To the control data writing register 34 of
Subscriber terminal TE₁₂Control to turn on the amplifier for the ringer
Write the data. The written control data is the local subscriber end
Under the control of the end / subscriber trunk synchronization circuit 39,
Road L₁₁Local subscriber terminal TE via₁₂Sent to
Internal subscriber terminal TE₁₂Then, the incoming call operation is performed. Na
For control data, reset, clock data, call processing history
Data including control data related to functions such as three-way talks
ing.

The voice code communication path 32 of the subscriber trunk ST ₁₁ is composed of a ping-pong IC, and the command data storage register 33 and the control data writing register 34 are composed of a gate array. Digital P with the above configuration
When the BX 31 has a large amount of traffic, the control data write register 34 and the command data storage register 33 are optimally used, and the scanning by the polling sequence of the CPU 40 with respect to the parallel / serial bus 35 works properly. In the small-scale digital PBX installed in Silver Mansion, the efficiency of use of the control data write register 34 and the command data storage register 33 is lowered, and the cost of the entire system is not optimal for traffic. In addition, the parallel / serial bus 35 and the serial / parallel bus 36 must be wired to the control data write register 34 and the command data storage register 33 of the subscriber trunks ST ₁₁ , ST _12, ... There are difficulties.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks. The redundant circuit parts are reduced and the wiring between the CPU and the controlled device is simplified so that the cost of the entire system is optimized for traffic. It is an object of the present invention to provide a digital PBX that has been digitized.

[0008]

DISCLOSURE OF THE INVENTION Digital PBX of the Invention
Includes a local subscriber terminal, a subscriber trunk connected to the local subscriber terminal, a digital line network to which the subscriber trunk is connected, and a CPU for controlling the subscriber trunk and the digital line network. A control data write register that writes control data for controlling the subscriber terminals on the premises via the customer trunk, and command data such as on-hook, off-hook, and PB signals input from the subscriber terminals on the subscriber trunk. Command data storage register, and a command data read switch provided in the subscriber trunk and operating sequentially by scanning by the polling sequence of the CPU to connect the command data storage register to the local subscriber terminal; Control data write register in conjunction with data read switch And a switch for controlling data writing to be connected to the premises subscriber terminals over.

[0009]

The command data reading switch provided in the subscriber trunk switches between the local subscriber terminal and the command data storage register for storing command data such as on-hook, off-hook and PB signals input from the local subscriber terminal. . Further, the control data writing switch and the local subscriber terminal are switched by the control data writing switch which is interlocked with the command data reading switch. The command data reading switch and the control data writing switch sequentially operate by scanning by the polling sequence of the CPU. The CPU decodes a command and processes traffic such as an incoming call and an outgoing call according to the presence or absence of the contents of the switched command data storage register and control data write register.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the digital PBX according to the present invention will be described in detail below with reference to FIG. Digital PB according to the invention
X1 is, as shown in FIG. 1, a local subscriber terminal TE ₁ , T
E ₂ , ..., Subscriber trunks ST ₁ , ST ₂ ... Connected to local subscriber terminals, Digital line network EX ₁ to which subscriber trunks are connected, and subscriber trunks And CPU2 for controlling the digital line network
0, and a control data writing register 14 for writing control data for controlling a subscriber terminal on the premises via a subscriber trunk, and an on-hook, off-hook, PB input to the subscriber trunk from the subscriber terminal. A command data storage register 13 for storing command data such as signals and a subscriber trunk are provided, which are sequentially operated by scanning by the polling sequence of the CPU, and the command data storage register is connected to the local subscriber terminal. A command data read switch 3 and a control data write switch 4 which works in conjunction with the command data read switch and connects the control data write register to the local subscriber terminal are provided.

[0011] premises subscriber terminal TE ₁ is connected to the home line L _1, a home line L ₁ subscriber trunk ST ₁ audio coding speech path 2, command data readout switch 3 and the control data write switch 4 It is connected. Further, the voice code communication path 2 of the subscriber trunk ST ₁ is accommodated in the digital line network EX ₁ and converts the voice code ping-pong-transmitted with the local subscriber terminal TE ₁ into an up / down voice code.

One of the normally open contacts of the command data reading switch 3 is connected to the home line L ₁ , and the other is connected to the data input side of the command data storage register 13 via the command data reading serial line 17a. There is. The data output side of the command data storage register 13 is connected to the CPU via the serial / parallel bus 16.
It is connected to 20.

The control data writing switch 4 is composed of a switching contact, the switching contact is connected to the home line L _1, and the normally closed side of the switching contact is connected to the synchronizing signal generator 18 via the synchronizing signal line 18a. ing. The normally open side is connected to the data output side of the control data write register 14 via the control data write serial line 17b, and the data input side of the control data write register 14 is connected to the parallel / serial bus 15. It is connected to the CPU 20 via the.

The control output side of the local subscriber terminal / subscriber trunk synchronization circuit 19 under the control of the CPU 20 has a command data read switch 3, a control data write switch 4, a command data storage register 13, and a control data write. It is connected to the control input side of the register 14 and the synchronization signal generator 18. The CPU 20 also controls the digital line network EX ₁ and the service sound trunk 21 accommodated in the digital line network EX ₁ .

In the digital PBX 1 having the above-mentioned configuration, all the switching contacts of the control data writing switches 4 are switched to the normally closed side when the system is started up, and output from the sync signal generator 18 via the sync signal line 18a. .. are transmitted to the local subscriber terminals TE ₁ , TE ₂ , .... The local subscriber terminals TE ₁ , TE ₂ , ... Having been input with the synchronization code are waiting for the synchronization code, so that synchronization is established when the synchronization code is input, and control data is written as necessary. The input switch 4 and the command data read switch 3 operate. When the control data writing switch 4 operates, the switching contact is switched to the normally open side, the synchronous code sent to the local subscriber terminal is stopped, the normally open side of the switching contact is closed, and the switching contact has the control data. It is connected to the write register 14.

The CPU 20 selectively controls only the control data writing switch 4 and the command data reading switch 3 having the control data or the command data by scanning by the polling sequence, for example, sending a request. Find the local subscriber terminal TE ₁ . The CPU 20 sends an AC signal to the control data write register 14 to indicate that transmission is OK.
Write the K code. Since this ACK code is sent to the local subscriber terminal TE ₁ via the closed switching contact of the control data writing switch 4, the local subscriber terminal TE ₁ is connected to the control data writing switch 4 by the control data writing switch 4. The command data is sent to the command data storage register 13 through the closed normally open contact of the interlocking command data reading switch 3. The subsequent operation is the same as that of the conventional digital PBX 31.

[0017]

As is apparent from the above embodiments, the digital PBX of the present invention has a private subscriber terminal, a subscriber trunk connected to the private subscriber terminal, and a digital line to which the subscriber trunk is connected. CPU controlling network and subscriber trunk and digital line network
And a control data writing register for writing control data from the CPU for controlling the subscriber terminal on the premises via the subscriber trunk, and an on-hook, off-hook, PB signal, etc. input from the subscriber terminal to the subscriber trunk. Command data storage register for storing the command data and the command data storage register provided in the subscriber trunk and sequentially operated by scanning by the polling sequence of the CPU to connect the command data storage register to the local subscriber terminal. Switch and a control data write switch that works in conjunction with the command data read switch and connects the control data write register to the local subscriber terminal, so the overall system cost is optimized for traffic. Reduce redundant circuit parts, and wire between CPU and controlled device There is an effect that is simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital PBX according to the present invention.

FIG. 2 is a block diagram of a conventional digital PBX.

[Explanation of symbols]

3 ・ ・ Switch for reading command data 4 ・ ・ ・ ・ ・ ・ Switch for writing control data 13 ・ ・ ・ ・ ・ ・ Command data storage register 14 ・ ・ ・ ・ ・ ・ Control data writing register 20 ・・ ・ ・ ・ ・ CPU TE ₁ , TE ₂・ ・ ・ On-premises subscriber terminal ST ₁ , ST ₂・ ・ ・ ・ ・ ・ Subscriber trunk EX ₁・ ・ ・ ・ ・ Digital line network

Claims (1)

[Claims] 1. A private subscriber terminal, a subscriber trunk connected to the private subscriber terminal, a digital line network to which the subscriber trunk is connected, and the subscriber trunk and the digital line network are controlled. In a digital PBX having a CPU, a control data write register for writing control data for controlling the private subscriber terminal from the CPU via the subscriber trunk, and the subscriber trunk from the private subscriber terminal A command data storage register for storing command data such as input on-hook, off-hook, and PB signals, and a port of the CPU provided in the subscriber trunk.
A command data read switch that sequentially operates by scanning by a ring sequence and connects the command data storage register to the local subscriber terminal, and a command data read switch are interlocked, and the control data write register is connected to the local site. A digital PB having a control data writing switch connected to a subscriber terminal
X.