JP3236378B2 - Digital PBX - Google Patents

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 more particularly, to an on-hook, off-hook, and sub-hook provided in a subscriber trunk so as to be suitable for small-scale switching with low traffic.
A command data storage register for storing command data such as a PB signal and a control data write register for writing control data for controlling a local subscriber terminal from the CPU are removed, and the command data storage register and the control data write register are replaced by the subscriber. Digital P shared by trunks
BX.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional digital PBX 31 has a private subscriber terminals TE ₁₁ , TE ₁₂ ,..., A subscriber trunk ST ₁₁ , S
T ₁₂ · · · · · ·, digital line network EX _2, the service sound trunk 38 consists of a premises subscriber terminal / subscriber trunk synchronizing circuit 39 and CPU 40, subscriber trunk ST _11, ST ₁₂ · · · · · Is provided with a voice code channel 32, a command data storage register 33, and a control data write register 34.

[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. Moreover, the voice code communication path 32 of the subscriber trunk ST ₁₁ is received in a digital line network EX _2, a speech code that is ping-pong transmission between the premises subscriber terminal TE _11, and converts the uplink / downlink voice code.

[0004] One end of the other end of the home line L ₁₁ connected to the command data storage register 33 is connected to the serial / parallel bus 36, the control side of the command data storage register 33 are premises subscriber / subscriber trunk synchronization The circuit 39 is connected. Further, one end and the other end of the control data writing register 34 connected to the home line L ₁₁ is connected to the parallel / serial bus 35, the control data the control side of the write register 34 premises subscriber / subscriber trunk It is connected to the synchronization circuit 39.

[0005] The digital line network EX ₂
And the CPU40 which controls the digital line network EX ₂ service sound trunk 38 received in the serial / parallel bus 36 and a parallel / serial bus 35 is connected. In the digital PBX 31 configured as described above, when the local subscriber terminal TE ₁₁ of the digital PBX 31 goes off-hook, this state change is stored in the command data storage register 33 according to the control of the local subscriber terminal / subscriber trunk synchronization circuit 39. Is done. CP
U40 is port serial / parallel bus 36 - Ringushi - since the scanning with the cans, the off-hook state change by the premises subscriber terminal TE ₁₁ is decoded by the CPU 40, a dial tone digital line network from the service sound trunk 38 EX It is sent to the speech encoding speech path 32 of the subscriber trunk ST ₁₁ through _2. P at local subscriber terminal TE ₁₁
When the B signal is transmitted, the state change due to the PB signal is C
It is decrypted by PU40, subscriber trunk ST ₁₂ that correspond to PB signal is selected on the program logic. When the channel of the digital line network EX ₂ is reserved, a ring tone is transmitted from the service tone trunk 38 to the voice code channel 32 of the subscriber trunk ST ₁₂ via the digital line network EX ₂ . Further, the CPU 40 connects the subscriber trunk ST ₁₂ via the parallel / serial bus 35.
To the control data write register 34 of the local subscriber terminal TE.
Write control data to turn on ₁₂ ringer amplifiers. The written control data is control of premises subscriber / subscriber trunk synchronizing circuit 39, is sent to premises subscriber terminals TE ₁₂ via the home line L _11, premises subscriber terminal TE ₁₂ the call operation Is performed. The control data includes control data relating to functions such as reset, clock data, call processing history data, and three-party talks.

Moreover, the voice code communication path 32 of the subscriber trunk ST ₁₁ is composed of a ping-pong IC, the command data storage register 33 and the control data write register 34 and a gate array. Digital P with the above configuration
When the BX 31 has a lot of traffic, the control data write register 34 and the command data storage register 33 are optimally used, and the polling sequence of the CPU 40 for the parallel / serial bus 35 functions properly. In a small-scale digital PBX installed in Silver Mansion, the efficiency of use of the control data writing register 34 and the command data storage register 33 is reduced, and the cost of the entire system is not optimized for traffic. Further, 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 accumulation 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 disadvantages, and reduces the number of redundant circuit components and simplifies wiring between a CPU and a controlled device so that the cost of the entire system is optimized for traffic. It is an object of the present invention to provide a digitized digital PBX.

[0008]

SUMMARY OF THE INVENTION A digital PBX of the present invention
Comprises 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 controlling the subscriber trunk and the digital line network. A control data write register for writing control data for controlling the local subscriber terminal from the local trunk via the subscriber trunk, and the subscriber trunk stores command data such as on-hook, off-hook, and PB signals input from the local subscriber terminal. A command data storage register, a command data readout switch provided on the subscriber trunk, and sequentially operated by scanning by a 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]

In this digital PBX, a command data storage register for storing command data such as on-hook, off-hook, and PB signals input from the local subscriber terminal and the local subscriber terminal by a command data reading switch provided in the subscriber trunk. And switching. Further, the control data write register and the local subscriber terminal are switched by a control data write switch interlocked with the command data read switch. The switch for reading command data and the switch for writing control data sequentially operate by scanning by the polling sequence of the CPU. The CPU decodes the command according to the presence or absence of the contents of the switched command data accumulation register and control data write register, and processes traffic such as incoming calls and outgoing calls.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a digital PBX according to the present invention will be described below in detail with reference to FIG. Digital PBX1 according to the invention as shown in FIG. 1, premises subscriber terminal TE _1,
TE _2, and ......, premises subscriber subscriber trunk ST ₁ the connected to the terminal, and ST ₂ · · · ·, a digital line network EX ₁ subscriber trunk is connected, the subscriber trunk And CPU controlling digital line network
20, a control data write register 14 for writing control data for controlling the local subscriber terminal from the CPU via the subscriber trunk, and an on-hook, off-hook, PB A command data storage register 13 for storing command data such as signals, and a command data storage register provided in a subscriber trunk and sequentially operated by scanning by a polling sequence of a CPU to connect the command data storage register to a local subscriber terminal. A command data read switch 3 and a control data write switch 4 interlocking with the command data read switch and connecting the control data write register to the local subscriber terminal.
And Premises subscriber terminal TE ₁ is connected to the home line L _1, the home line L ₁ is connected to the subscriber trunk ST ₁ audio coding speech path 2, command data readout switch 3 and the control data write switch 4 I have.

The voice code channel 2 of the subscriber trunk ST ₁ is accommodated in the digital line network EX ₁ , and the voice code transmitted ping-pong with the local subscriber terminal TE ₁ is converted into an upstream / downstream voice code. Convert. One of normally open contacts of the command data read switch 3 is connected to the home line L _1, the other command data storage register 1 via the serial line 17a for command data read
3 is connected to the data input side.

The command data storage register 13
Is connected to the CPU 20 via the serial / parallel bus 16. The control data writing switch 4 is formed of a switching contact, and the switching contact is a home line L _1.
And the normally closed side of the switching contact is connected to a synchronization signal generator 18 via a synchronization signal line 18a. 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,
The data input side of the control data write register 14 is connected to the CPU 20 via the parallel / serial bus 15.

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

In the digital PBX 1 having this configuration, all the control data writing switches 4
Of the synchronous signal line 18
The synchronization code output from the synchronization signal generator 18 is transmitted to the local subscriber terminals TE ₁ , TE ₂ ,. The local subscriber terminals TE ₁ , TE ₂ ,...
Are waiting for the synchronization code, so that when the synchronization code is input, the synchronization is established, and the control data writing switch 4 and the command data reading switch 3 operate as required. When the control data writing switch 4 is operated, the switching contact is switched to the normally open side, the synchronization code sent to the local subscriber terminal is stopped, the normally open side of the switching contact is closed, and the switching contact is controlled by the control data. Connected to write register 14.

The CPU 20 selectively controls only the control data write switch 4 and the command data read switch 3 having control data or command data by scanning in a polling sequence, and sends out a request, for example. find the premises subscriber terminal TE _1. The CPU 20 informs the control data write register 14 that the transmission is OK.
Write the K code. This ACK code is transmitted to the local subscriber terminal TE ₁ via the switching contact of the control data writing switch 4 whose normally open side is closed, so that the local subscriber terminal TE ₁ is used for writing the control data. The command data is transmitted to the command data storage register 13 through the normally open contact of the command data reading switch 3 that is linked with the switch 4. The subsequent operation is performed using the conventional digital PBX3
Same as 1.

[0016]

As is clear from the above embodiments, according to the digital PBX of the present invention, redundant circuit components are reduced and the CPU and the controlled system are controlled so that the cost of the entire system is optimized for traffic. This has the effect of simplifying wiring between devices.

[Brief description of the 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 Command data read switch 4 Control data write switch 13 Command data storage register 14 Control data write register 20 ····· CPU TE ₁ , TE ₂ ······ Subscriber subscriber terminal ST ₁ , ST ₂ ······· Subscriber trunk EX ₁ ····· Digital line network

Claims (1)

(57) [Claims] 1. 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 controlling the subscriber trunk and the digital line network. A digital PBX including a CPU, a control data write register for writing control data for controlling the local subscriber terminal from the CPU via the subscriber trunk; and A command data storage register for storing input command data such as on-hook, off-hook, and PB signals; a command data storage register provided in the subscriber trunk;
It operates sequentially by scanning in a ring sequence, and interlocks with the command data readout switch for connecting the command data accumulation register to the local subscriber terminal and the command data readout switch, and stores the control data write register in the local area. A digital PB comprising a control data writing switch connected to a subscriber terminal.
X.