KR900007058B1 - Call switching method in babx - Google Patents

Abstract

The method for allocating the exclusive line to a person having the priority comprises: (a) searching the incoming ring signal; (b) checking the priority of the input ring signal with stored data of local line table; (c) sending the ring signal to the subscriber's address and checking the response if the line is for the exclusive subscriber; (d) connecting the call line when the subscriber responses and checking the communication conclusion; (e) cutting off the line after checking the hook-off state of the subscriber.

Description

CO line calling method for private line exchange

1 is a flowchart of a method for exclusive use of CO line calls according to the present invention.

2 is a flowchart of a method for exclusive use of CO line calls when making a CO line call according to the present invention.

3 is a block diagram of a private exchange trunk line interface card to which the present invention is applied.

4 is a block diagram of a private switch extension interface card to which the present invention is applied.

5 is a time switch connection diagram in a private exchange according to the present invention;

6 is a block diagram of a control card of a system for controlling a trunk line interface card and a station interface card.

7 is a memory map according to the present invention.

The present invention relates to a call method of a private exchange, and more particularly, to a call method for exclusively using a trunk line for a subscriber having a high grade.

In a normal private exchange, if the traffic of the trunk line is very high, or if the trunk lines are all busy, even if a high-level extension subscriber cannot catch the trunk line, There was a flaw in which no proper measures could be taken.

Accordingly, an object of the present invention is to provide a method for exclusive use of a C.O.line for a subscriber having a high grade in a call method of a private exchange.

Another object of the present invention is to allow a subscriber to use a CO line exclusively to connect a dedicated CO line when dialing, as if dialing like a subscriber directly connected to a CO switch, and when a ring is received by a CO line, an extension subscriber allowed to use a dedicated CO line. To provide a way to connect the incoming call to.

In order to achieve the above object, the present invention memorizes the address of the current subscriber station which can be used for each trunk line in advance in the central processing unit of the switchboard, and when the call is received by the dedicated trunk line, the subscriber finds the subscriber address and sends a ring signal to the subscriber. In addition, it is characterized in that it consists of a process of finding a dedicated CO line address for a dedicated CO subscriber using the CO line, and catching a CO line and connecting the call paths.

에 의해 인에이블되어 입력되는 신호를 디코딩하여 출력하는 디코더(315)와, 상기 디코더(315)의 출력에 의해 인에이블되며, 중앙처리장치부에서 출력되는 출력어드레스(BA0-BA1) 지정에 따라 각각 입력되는 데이터(DW0)(DW1) 및 (DW7)을 래치 출력하는 어드레서블 래치(Addressable latch)(314)(318)과, 상기 어드레서블래치(313)의 출력에 의해 DP(Dial pulse)을 출력하는 디코딩 로직부(313)와, 상기 디코딩 로직부(313)의 출력에 의해 상기 DP송출 및 응답회로(303)을 동작시키는 릴레이 구동부(312) 및 DP루프 릴레이(311)와, 상기 어드레서블 래치(318)의 출력에 의해 상기 GND송출 및 검출기(302)를 동작시키는 릴레이 구동부(317) 및 GND송출 릴레이(316)로 구성된다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 is a flow chart of a trunk line dedicated call method according to the present invention, Figure 2 is a flow chart of a trunk line dedicated call method according to the present invention. 3 is a block diagram of a trunk card interface card of an exchanger according to the present invention, and has a known circuit configuration. It is connected to the ring and tip wire (R) (T) of a trunk line, and is connected to the overvoltage protection circuit 301 which cuts off the overvoltage from a ring and tap line (R) (T), and both ends of the said overvoltage protection circuit 301. GND transmission and detector 302 which forms a trunk line current loop by relay control, and is connected to the ring line R to be switched by relay control to send DP (Dialpulse) or form a call loop. It is connected to the DP transmission and response circuit 303, the tip line T and the ring line R through the DP transmission and response circuit 303, and combines a voice signal to transform the transformer unit 304 and the transformer unit 304 And a balance circuit 305, a filter (PCM filter) 306, a codec 307, and a channel designation circuit 310 to match impedances with a trunk line and a private exchange period. Channel assignment of the central processing unit (shown in FIG. 6) connected to the circuit 305 and a time switch (not shown). A channel designation circuit unit 300 for coupling a voice signal to an assigned channel by a channel, a ring detection circuit 308 connected to both ends of an input of the transformer unit 304 to detect an input of a ring signal, and the ring detection circuit ( A multiplexer 309 for outputting the output of the 308 by the address BA0-BA1 output control of the central processing unit, and the enable signal of the central processing unit;

A decoder 315 which decodes and outputs a signal which is enabled by the input signal, and which is enabled by the output of the decoder 315 and input according to the designation of the output address BA0-BA1 output from the central processing unit. Addressable latches 314 and 318 for latching out the data DW0, DW1 and DW7 are outputted, and the output of the addressable latch 313 is used to generate a DP (Dial pulse). A decoding logic unit 313 for outputting, a relay driver 312 and a DP loop relay 311 for operating the DP transmission and response circuit 303 by the output of the decoding logic unit 313, and the addresser The output of the latch 318 includes a relay driver 317 and a GND sending relay 316 for operating the GND sending and detector 302.

는 리이드신호,

은 라이트제어신호,

은 국선인터페이스 카드 인에이블신호, BA12는 채널제어 어드레스로서 중앙처리장치부로부터 제공되는 신호를이다. DR0, DR1, DR7은 중앙처리장치부가 리이드하는 리이드 데이터, DW0, DW1, DW7은 중앙처리장치부가 라이트하는 라이트 데이터이고, DP는 다이얼 펄스(Dial puluse)신호가 입력되는 단자이다. 그리고, MHW와 DHW는 PCM 하이웨이로서 도시하지 않은 타임스위치에 접속되는 것이고, FSX는 동기신호(TimeSlat Sync Pulse), CLKXR는 PCM비트클럭(PCM bit clock), BCLKC는 PCM제어클럭(PCM Conntrd Clock), DC는 코덱을 제어하는 8비트 직렬 데이터로 중앙처리장치로부터 제공된다.Among the above configurations, BA0-BA1 is an address,

Is the lead signal,

Silver light control signal,

Is a CO line interface enable signal, and BA12 is a signal provided from the central processing unit as a channel control address. DR0, DR1, and DR7 are lead data read by the central processing unit, DW0, DW1, and DW7 are write data written by the central processing unit, and DP is a terminal to which a dial pulse signal is input. The MHW and DHW are connected to a time switch (not shown) as the PCM highway, the FSX is a TimeSlat Sync Pulse, the CLKXR is a PCM bit clock, and the BCLKC is a PCM Conntrd Clock. DC is provided from the central processing unit as 8-bit serial data that controls the codec.

First, in FIG. 3, the operation of the trunk line incoming procedure in the idle state is shown. When the idle state is in the idle state, the incoming relay in the DP transmission and response circuit 303 is restored, and thus the tip and the ring T ( The DC power supply coming from the other station through R) is cut off by the capacitor in the circuit so that the ring detection circuit 308 does not operate. When the ring signal (20Hz, 80Vrms) comes from the trunk line to the ring (R) line and the tip (T) line, it is sent to the ring detection circuit 308 through the capacitor in the overvoltage protection circuit 301 and the DP transmission and response circuit 303. Is entered. At this time, the ring detection circuit 308 detects the ring signal and inputs it to the multiplexer 309 and the tri-state buffer 319. At this time, the tri-state buffer 319 is enabled by the output of the decoder 315 and outputs DR0 and DR1 as "1", which is read by the central processing unit.

을 출력하고 3-상태버퍼(319)을 인에이블시키기 위한 신호(BA12,

,

)을 출력하면, 디코더(315)가 이를 디코딩하여 3-상태버퍼(319)를 인에이블시키게 된다. 상기와 같은 동작에 의해 링검출신호(DR0=0, DR1=1) 를 중앙처리장치부에 전달하면 중앙처리 장부내 MPU(Michoprocessor) 가 착선되었음을인지한다. 이를 인지한 MPU는 국선착신호에 응답키 위하여 디코더(315)로 어드레서블 래치(314)를 인에이블시키기 위한 신호를 출력하면, 어드레서블 래치(314)가 인에이블 된다. 이와같은 상태에서 중앙처러장부대 MPU가 BA0-BA1로 DP송출 및 응답회로(303)을 선택키 위한 어드레스를 출력하고, DW0에 "0", DW1에 "1"을 출력하면, 어드레서블 래치(314)가 디코딩 로직부(313)을 통해 릴레이 구동부(312)를 구동한다. 이때 DP루프 릴레이(311)가 구동되며, 상기 DP루프 릴레이 구동에 의해 DP송출 및 응답회로(303)가 통화루프를 형성한다. 아이들 상태에서 국선발신시의 동작을 살펴보면 이는 하기와 같다. 중앙처리장치부내 MPU가 디코더(315)는 어드레서블 래치(314)을 인에이블신호를 출력하면, 디코더(315)는 어드레서블 래치(314)을 인에이블시킨다. 이때 상기 MPU가 BA0-BA1으로 DP송출 및 응답회로(303)을 선택하는 어드레스를 출력하고, DW0을 "0"으로, DW1을 "1"로 하면, 상기 어드레서블 래치(314)는 이를 래치하여 디코딩로직부(313)으로 출력한다.On the other hand, when the decoder 315 outputs the enable signal, the CPU unit enables the signal.

Signal for outputting and enabling the tri-state buffer 319 (BA12,

,

), The decoder 315 decodes it and enables the tri-state buffer 319. When the ring detection signals DR0 = 0 and DR1 = 1 are transmitted to the central processing unit by the operation described above, it is recognized that the MPU (Michoprocessor) in the central processing ledger is landed. Recognizing this, the MPU outputs a signal for enabling the addressable latch 314 to the decoder 315 in order to respond to the call, and the addressable latch 314 is enabled. In this state, when the central handling unit MPU outputs an address for selecting the DP transmission and response circuit 303 to BA0-BA1, and outputs "0" to DW0 and "1" to DW1, an addressable latch. 314 drives the relay driver 312 through the decoding logic unit 313. At this time, the DP loop relay 311 is driven, and the DP transmission and response circuit 303 forms a call loop by driving the DP loop relay. Looking at the operation of the CO line in the idle state as follows. The decoder 315 enables the addressable latch 314 when the MPU in the central processing unit outputs the enable latch 314 to enable the addressable latch 314. At this time, if the MPU outputs an address for selecting the DP transmission and response circuit 303 to BA0-BA1, and DW0 is set to "0" and DW1 is set to "1", the addressable latch 314 latches it. And output to the decoding logic unit 313.

The decoding logic unit 313 decodes it and outputs it to the relay driver 312. The relay driver 312 drives the DP loop relay 311 to form a communication path of the DP transmission and response circuit 303. By this operation, a current loop of the ring line R and the team line T is formed, and the local exchange recognizes this. The relay in the DP transmission and response circuit 303 is driven through the relay driver 312 to form a loop. Then, when the landing is restored during the call, the MPU detects this and recovers the relay 311 of the CO line interface card to break the loop of the DP transmission and response circuit 303.

의 입력에 의해 동작되어 채널/포트지정 어드레스(BA12) 및 리드/라이트제어신호(

,

)의 입력을 디코딩하여 상기 채널지정회로(409), 멀티플렉서(408), 어드레서를 래처(412)의 인에이블신호를 출력하는 디코더(413)와, 상기 디코더(413)에서 출력되는 인에이블신호에의해 인에이블되어 데이터(DW0)의 신호를 래치 출력하는 상기 어드레서블 래치(412)의 출력에 의해 릴레이(210) 구동하여 상기 링릴레이(201)를 제어하는 릴레이 드라이브(211)로 구성된다.4 is connected to the subscriber telephone of the extension interface card of the switch according to the present invention receives a ring source of the ring source terminal (RING) so that the ring signal is transmitted to the call lines (L0-, L0 +) relay 410 which will be described later Firing the signal output from the overvoltage protection circuit 402 and the overvoltage protection circuit 402 to protect the circuit by blocking the overvoltage passing through the ring relay 401 A transformer 403 for converting, a subscriber sensing circuit 407 for detecting a hook on / off of a subscriber by sensing a change in the voltage state output from the overvoltage protection circuit 402, and the subscriber sensing circuit 407 The multiplexer 408 multiplexes the output according to the value of the address BA0-BO2 generated by the central processing unit (see FIG. 6), and latches the data DW0 to the designated address at the address (BA0-BA1). Addressable A latch 412, a filter 405 for filtering an output signal of the transformer unit 403, a codec 406 for coding and decoding a signal filtered by the filter 405 or a signal to be filtered, and the codec A channel designation circuit 409 which designates a transmission channel according to the signal transmission at 406 according to the address BA0-BA1, and an enable signal

Is operated by input of channel / port designation address (BA12) and read / write control signal (

,

Decoder 413 for decoding the input of the channel designation circuit 409, the multiplexer 408, and the addresser 412, and the enable signal output from the decoder 413. It is composed of a relay drive 211 that is driven by the relay 210 by the output of the addressable latch 412 is enabled by the output latch (412) to control the ring relay 201. .

In FIG. 4 (not shown), the PCM highway stages (MHW, DHW) are connected to the digital switching circuit, and the PCM timeslot frame synchronization signal (FSX), PCM bit clock (CLLKX), PCM control clock (BCLKC) Is connected to a clock supply board (not shown), and the entire part is known as a known part.

In FIG. 4, the operation when the subscriber connected to the call lines L0 + and L0- is hooked on / off and when the ring signal is sent to the subscriber is described.

/

)중 리드제어 신호(

) 가 "로우"로 되면, 디코더(413)가 이 신호를 디코딩하여 멀티플렉서(208)를 에이블시킨다. 이때 상기 멀피플렉서는 상기 어드레스(BA0-BA2)의 값에 의해 상기 가입자 감지회로(407)의 출력을 DR0를 "1"로 출력한다. 상기 DR0가''1"로 되면 이를 주기적으로 읽어들이는 중앙처리장치부는 내선가입자가 훅크 오프하였다고 판단한다.If the subscriber connected to the call line (L0 +) (L0-) now hooks off, a voltage drop occurs across the output of the overvoltage protection circuit 402 through the ring relay 401, causing the loop current of the line to be 7.5 mA. In this case, the subscriber monitoring circuit 407 output terminal is outputted "high". At this time, the channel / port designated address terminal BA12 output from the central processing unit becomes `` low '' and the read / write control signal (

Of

Of the lead control signal (

When " low ", the decoder 413 decodes this signal to enable the multiplexer 208. At this time, the mulpyplexer outputs the output of the subscriber detection circuit 407 to DR0 as "1" based on the values of the addresses BA0-BA2. When the DR0 becomes `` 1 '', the central processing unit that reads it periodically determines that the extension subscriber has hooked off.

)를 채널지정회로(409) 및 디코더(413)로 출력한다. 이때 디코더(413)은 인에이블신호(

)의 입력에 의해 인에이블되어 어드레스(BA12)와 라이드/라이트제어신호(

)(

)을 디코딩하여 채널지정회로(409)을 인에이블시킨다. 상기 채널지정회로(409)는 어드레스(BA0-BA2)에 의한 데이터에 의해 코덱(406)을 인에이블시키어 채널을 할당한다.When the subscriber hooks off as described above, the central processing unit sets the address BA12 to "high" and the address (BA0-BA2) of the corresponding port, the PCM control clock (BCLKC) and the enable signal (

) Is output to the channel designation circuit 409 and the decoder 413. In this case, the decoder 413 may enable the enable signal (

Is enabled by the input of the address BA12 and the ride / write control signal (

) (

Decode) to enable channel designation circuit 409. The channel designation circuit 409 enables the codec 406 based on the data of the addresses BA0-BA2 to allocate a channel.

On the other hand, if the subscriber hooks on during the call as described above, the loop voltage through the overvoltage protection circuit 402 becomes 7.5 mA or less. At this time, when the subscriber monitoring circuit 407 detects the voltage drop and reaches 7.5 mA or less, the subscriber monitoring circuit 407 outputs a "low" signal to the output terminal, and the multiplexer (MUX) 408 outputs DR0 as "low". At this time, when the central processing unit reads the DR0, it determines that the subscriber has hooked on.

와 라이트제어신호(

)을 "로우"로 출력하면, 디코더(413)은 입력신호를 디코딩하여 어드레서를 래치(412) 인에이를 시킨다. 이때 어드레서블 래치(412)는 포트어드레스(BA0-BA2)에 의해 DW0의 논리 "하이"를 릴레이 드라이버(411)로 출력하며, 릴레이 드라이브(411)은 릴레이(410)을 구동하여 링릴레이(401)의 릴레이 접점을 링소스로 스위칭시킨다. 상기의 동작에 의해 외부의 링소스(20HZ 80Vrms)가 통화라인(L0+)(L0-)를 통해가입자 전화기에 보내저 전화기의 링을 구동하게 된다.On the other hand, when a subscriber of an external or another extension calls an extension subscriber connected to a call line (L0 +) (L0-), the ring signal is transmitted by the following operation. The central processing unit outputs the port address BA0-BA2 for selecting DW0 as "high" and selecting the ring relay 401, and at the same time, the interface interface card enable signal.

And light control signal (

) Is " low ", the decoder 413 decodes the input signal to enable the address latch 412. At this time, the addressable latch 412 outputs the logic "high" of DW0 to the relay driver 411 by the port addresses BA0-BA2, and the relay drive 411 drives the relay 410 to ring relay ( Switch the relay contacts of 401 to a ring source. By the above operation, the external ring source 20HZ 80Vrms is sent to the subscriber phone via the call lines L0 + and L0- to drive the ring of the phone.

5 is a diagram illustrating a time switch (TSW) connection configuration in an exchange according to the present invention, and illustrates the extension / trunk line connection relationship between a transmitting end TX and a receiving end RX.

와 어드레스단자(A0-A7)(A12)와 클럭공급보드(도시하지 않았음)의 출력단에 입력단이 접속되어 이들의 입력을 제3도 및 제4도의 각 회로에 공급되는 콘트롤버터(501)와, 상기 MPU(500)의 데이터포트와 제3도의 국선 인터페이스 카드와 제4도의 내선 인터페이스 카드 각각의 라이트 데이터포트와 라이드 데이터포트(DW0-DW7)(DR0-DR7)에 접속되며, 상기 콘트롤버터(501)을 통한 리이드제어신호(

)와 어드레스(BA7)에 따른 방향으로 데이터를 버퍼링하는 데이터버퍼(503)와, 상기 콘트롤버터(501)의 출력 어드레스(BA0-BA7)를 디토링하여 제3도 및 제4도의 디코더(315)(413)을 인에이블시키는 국선 인터페이스 카드 인에이블신호

와 내선 인터페이스 카드 인에이블신호(

)을 출력하는 디코더(505)로 구성된다.FIG. 6 is a block diagram of a control card, that is, a central processing unit for controlling the trunk line interface card and the station interface card shown in FIGS. 3 and 4, and the programs of FIGS. A microprocessor (hereinafter referred to as MPU) 500 and a lead / light control signal terminal of the MPU 500

And an input terminal connected to an output terminal of the address terminals A0-A7 (A12) and a clock supply board (not shown), and the control butter 501 supplied to the circuits of FIGS. And a write data port and a ride data port (DW0-DW7) (DR0-DR7) of the data port of the MPU 500, the trunk line interface card of FIG. 3 and the station interface card of FIG. Lead control signal via 501

) And the data buffer 503 buffering data in the direction according to the address BA7, and the decoders 315 of FIGS. 3 and 4 by detoring the output addresses BA0-BA7 of the control butter 501. CO line interface card enable signal to enable (413)

And station interface card enable signals (

A decoder 505 that outputs

)와 어드레스(BR7)의 논리에 따라 MPU(500)의 데어터포트의 데이터를 라이트 데이터포트(DW0-DW7)로 출력하거나, 리이드데이터포트(DR0-DR7)은 MPU(500)의 데이터포트로 버퍼링하는 양방향 버퍼이다.In the above configuration, the control butter 501 is a one-way buffer, and the data buffer 503 is a lead control signal of the control butter 503 (

) And the data of the data port of the MPU 500 to the write data port DW0-DW7 or the lead data port DR0-DR7 is buffered to the data port of the MPU 500 according to the logic of the " Is a bidirectional buffer.

FIG. 7 is a memory map according to the present invention, which shows an extension subscriber table and a trunk subscriber table, which are located in the memory area of the MPU 500. As shown in FIG.

0, 1, 2,... , N is the address of the extension subscriber table, the extension port addresses, N + 1, N + 2,... M + n is the address of the CO line, which is the CO line address, and the area of the CO line address contains call processing related data such as a dedicated CO line dedicated bit bo, a dedicated CO line port address, and an extension telephone number. Stored. The trunk line dedicated address bits (bits indicating whether a trunk line dedicated subscriber is present) and the station port address are stored in the trunk line port address area.

Hereinafter, the operation relationship of the present invention will be described in detail with reference to the above-described drawing configuration.

Now, when the private exchange is operated, the MPU 500 of FIG. 6 outputs an address and lead control signal for enabling the CO line interface card, and the three state butter 319 of the CO line interface card of FIG. It is determined whether the logic of the outputs DR0 and DR1 is "1".

)와 어드레스(BA0-BA7)를 데이터버퍼(503)와 디코더(505)로 출력함과 동시에 제3도 및 제4도의 각 채널지정회로(310)(409)와 디코더(315)(413)로 출력한다.At this time, the control butter 501 of FIG.

) And address BA0-BA7 are outputted to the data buffer 503 and the decoder 505, and simultaneously to the channel designating circuits 310, 409 and decoders 315 and 413 of FIGS. Output

을 "로우"로 출력하다.Meanwhile, the decoder 505 of FIG. 6 that inputs an address for selecting a CO line interface card decodes the enable signal of the CO line interface card.

Outputs "low".

), 리이드제어신호(

)를 디코딩하여 3상태버퍼(319)를 인에이블 시킨다.Therefore, only the decoder 315 of the CO line interface card is enabled and the address BA12 light control signal ("low""high""low") is input through the control butter 501 of FIG.

), Lead control signal (

) To enable the tri-state buffer 319.

In the above state, when the ring signal is input to the ring line R and the tip line T of FIG. 3, the ring detection bulletin 308 detects the ring signal as described above with reference to FIG. DR0 and DR1 of 319 are output as logic "1".

The signal output from the three-state butter 319 is input to the MPU 500 through the data buffer 503 of FIG. 6 and the MPU 500 that inputs DR0 and DR1 as logic "1" in step 111. We believe the CO line has been received.

In step 111, the MPU 500, which determines the incoming / outgoing call, checks whether there is a subscriber to use the dedicated CO line in step 112 in the CO line table of FIG.

For example, when the trunk line port address of FIG. 3 is N + 1 in FIG. 7, the MPU 500 reads data in the address N + 1 area of the trunk line table to determine whether a bit bo is set for a subscriber line dedicated user.

If the dedicated CO line subscriber bit is set, the MPU 500 reads the station port address stored in the CO line table address N + 1 area of FIG. 7 in FIG. Perform the intermediary incoming process.

On the other hand, the MPU 500 that finds the corresponding subscriber address in step 113 transmits the corresponding port address (BA0-) to the control butter 501 and the data buffer 503 to drive the ring relay 401 of FIG. Output BA2), output DW0 as “high”, switch relay of ring relay 401 to receive ring signal of 20HZ 80Vrms output from signal generator, and then in step 115 the ring signal is converted to -48V DC. Overlap the voltage so that the phone rings. Then, when the extension subscriber picks up the handset and hooks it off, the subscriber monitoring circuit 407 detects it as described above in FIG. 4 and outputs a signal of the "high" state to the multiplexer 408.

을 "로우"로 하고, 내선가입자 인터페이스 카드를 인에이블시키기 위한 어드레스(A0-A7)을 콘트롤버터(501)로 출력한다.Meanwhile, the MPU 500 performing the process 111 of FIG. 1 reads the read control signal to read the output of the multiplexer 408 of FIG.

Is " low ", and an address A0-A7 for enabling the subscriber interface card is output to the control butter 501. The " low "

)을 제3도 및 제4도의 국선인터페이스 카드와 내선 인터페이스 카드로 출력함과 동시에 디코더(505)및 데이터버퍼(503)으로 출력한다. 상기 콘트롤버퍼(501)의 리이드제어신호(

)에 의해 데이터버퍼(503)은 리이드데이터포트(DR0-DR7)에서 MPU(500)로 버퍼링 방향이 결점되며, 디코더(505)는 입력어드레스(BA3-BA7)을 디코딩하여 내선 인터페이스 카드의 디코더(413)을 인에이블시킨다. 상기 내선 인터페이스 카드의 디코더(413)은 "로우"_"로우"_"하이"로 입력되는 어드레스(BA12)와 라이트제어신호(

)와 리이드제어신호(

)을 디코딩하여 멀티플렉서(408)을 인에이블시킨다. 상기 디코더(413)의 출력에 의해 인에이블된 멀티플렉서(408)은 가입자감지회로(407)에서 훅크 오프를 감지하여 논리 "1"로 한다.At this time, the controller 501 receives the input address BA0-BA7 and the read control signal (

) Are output to the trunk line interface card and the station interface card of FIGS. 3 and 4, and to the decoder 505 and the data buffer 503. Lead control signal of the control buffer 501 (

), The data buffer 503 has a buffering direction from the lead data ports DR0-DR7 to the MPU 500, and the decoder 505 decodes the input addresses BA3-BA7 to decode the decoder of the extension interface card. 413 enable. The decoder 413 of the station interface card has an address BA12 inputted as "low" _ "low" _ "high" and a write control signal (

) And lead control signal

) To enable multiplexer 408. The multiplexer 408 enabled by the output of the decoder 413 detects the hook off in the subscriber detection circuit 407 and sets it to logic " 1. "

The DR0 (“1”) output from the multiplexer 408 is input to the MPU 500 through the data buffer 501, where the MPU 500 hooks off a dedicated CO subscriber in step 116. Judging by the answer.

In response to determining the response in step 116, the MPU 500 outputs a signal capable of enabling the addressable latch 412 in the subscriber interface card, so that DW0 becomes " 1 " To isolate the ring relay 401 to break the ring. The MPU 500 performing the process 117 outputs the signal as described in FIG. 4 to the channel designation circuit 409 in the process 118 to allocate a predetermined channel.

Next, in step 120, DW0 of the trunk line interface card is made a logic " high " to drive the DP loop relay 311 to form a trunk line loop in the DP transmission and response circuit 303. The CPU 500 that forms the trunk line loop in step 120 allocates a channel by CLKXR and DC as the codec of the trunk line subscriber card in step 121, and from step 122, the process shown in FIG. As described above, the call subscriber's transmit / receive type slot is connected to the subscriber's transmit / receive time slot timeslot and time switch (TSW) to allow mutual communication.

Hereinafter, as described above, the MPU 500 connecting the call path outputs the output of the three-state buffer 319 changed by the subscriber detection call 407 of the extension interface card to determine whether the called party terminates the call in step 123. If it detects and DR0 becomes "0", it determines that the subscriber has hooked on. After finishing the call of the extension subscriber, the MPU 500 monitors the call loop by turning off the DP loop relay 311 of FIG. 3 by making DW0 of the CO line interface card logically “low” in step 124. In step 125, the CO line and the extension subscriber release the channel of the card, and in step 126, the time slot used is restored to its own channel. On the other hand, the above-described process 119 is a part for performing the breeder's incoming process, and is a normal incoming process performed only when there is no subscriber line dedicated subscriber in the process 112.

Next, an operation performed by an extension subscriber set to transmit trunk lines will be described with reference to the flowchart of FIG. 2.

When the extension subscriber picks up the handset and hooks it off to the call line L0 + (L0-) of FIG. 4, the subscriber sensing circuit 407 monitors this and inputs a logic "high" to the multiplexer 408 as described above.

)을 제공하고 멀티플렉서(408)에 어드레스(BA0-BA2)를 출력하면, 디코더(413)은 입력되는 신호를 디코디하여 멀티플렉서(408)을 인에이블시킨다. 이때 인에이블된 멀티플렉서(408)은 입력어드레스(BA0-BA2)에 의해 가압자회로(407)의 출력을 선택하여 DR0을"하이"로 출력한다. 상기 멀티플렉서(408)의 출력은 데이터버퍼(503)를 통해 MPU(500)에 입력되며, 이때 MPU(500)는 과정(211)을 수행하여 내선가입자가 "훅크 오프"하였음을 인지한다.At this time, the MPU 500 performing the flowchart of FIG. 2 every predetermined time is enabled by the decoder 413 of FIG. 4 through the control buffer 501 and the decoder 505 of FIG.

) And output the addresses BA0-BA2 to the multiplexer 408, the decoder 413 decodes the input signal to enable the multiplexer 408. At this time, the enabled multiplexer 408 selects the output of the pressurizer circuit 407 by the input addresses BA0-BA2 and outputs DR0 as "high". The output of the multiplexer 408 is input to the MPU 500 through the data buffer 503, where the MPU 500 performs process 211 to recognize that the extension subscriber has "hooked off".

In the process 211, the MPU 500 that recognizes the hook-off of the extension subscriber receives the channel designating signals through the control buffer 501 and the decoder 505 of FIG. 6 as described above with reference to FIG. The channel designating circuit 409 is controlled to allocate a channel. In step 212, the MPU 500, which allocates a channel, examines the extension subscriber table of FIG.

For example, when the port address of the station subscriber is "2", it is determined by searching whether the subscriber line bo dedicated to the CO line is set in the data of the station 2. If the dedicated subscriber to the CO line in step 213 is used, the MPU 500 reads the CO line address in the area within the address (address 2) of the extension subscriber table in step 214.

In step 214, the MPU 500 that finds the CO line address from the extension subscriber table is located in FIG. 3 through the control butter 501 and the data butter 503 of FIG. At the same time as outputting the port address as described above, DW0 is outputted with logic "1". Accordingly, the DP loop relay 311 of FIG. 3 is driven, whereby a call loop is formed between the ring line R and the tip line T through the DP transmission and response circuit 303.

The MPU 500 performing step 215 sets the address BA12 of FIG. 3 to “high” through the control buffer 501 of FIG. 6 in step 216, and the address BA0 for specifying a channel. -BA1) outputs to allocate channel of CO line.

At this time, the decoder 315 of FIG. 3 which inputs the address BA12 as "high" enables the channel designating circuit 310, and the channel designating circuit 310 inputs the address BA0-BA1 and the PCM control clock. The channel of the codec 307 is allocated by (BCLKC).

In the process 216, the MPU 500 allocates the trunk line channel to the station subscriber by connecting the TX channel of the trunk line time slot of FIG. 5 and the RX channel of the station time slot on the time switch TSW in step 217. Allows the user to listen to the CO line to make a predetermined call.

As described above, in the present invention, a subscriber having a high call grade picks up a telephone and hears a CO line immediately, as if directly connected to a CO switch, and when the call is received by a phone number assigned to the CO line, the subscriber directly receives a call. It is effective to keep the subscriber's phone number as its own phone number, and also, when the incoming call is not the phone to be received, it can transfer to other subscribers, thereby greatly improving the service quality of the exchange.

Claims (2)

12. A ring signal retrieval process for retrieving whether a ring signal is incoming from a CO line in a call method dedicated to a CO line of a private exchange having a CO line dedicated bit and an extension subscriber address in an address area of a CO line. In the ring signal retrieval process 111, it is determined whether or not there is an exclusive subscriber to use the CO line when determining the ring signal input. 112), when it is determined in the process of determining whether to use a dedicated CO line user 112, a response search for transmitting a ring signal by reading the extension subscriber address from the CO line table, and searching whether the extension subscriber responds; When the station subscriber has responded in the process 113-116 and the response search process 113-116 Blocking the extension ring, connecting the extension line with the subscriber line, and connecting and ending search process (117-123) for searching for the end of the call of the subscriber, and connecting and ending search process (117-123) The method for exclusive use of private line exchanges for private exchanges, characterized in that the recovery process (124-126) is performed to block the call lines of the trunk line and the extension line when the extension subscriber determines that the call is terminated by hook-on. 6. A subscriber subscriber monitoring process (211) for retrieving whether an extension subscriber has been hooked off, in a private telephone exchange calling method of a private exchange having a subscriber subscriber table storing a trunk line dedicated bit and a trunk line port address in an extension port address area; In the extension subscriber monitoring process 211, when the subscriber extension is determined to be hooked off, the subscriber subscriber channel assignment process 212 for allocating the channel of the subscriber extension and the channel assignment process in the subscriber subscriber channel assignment process 212 are performed. A subscriber's dedicated subscriber line determination process (213) for judging whether a subscriber is a subscriber to a CO line dedicated subscriber or not, and the subscriber who hooked off in the CO's dedicated subscriber's judgment process (213) determines whether a subscriber is a CO line dedicated subscriber. The station stored in the subscriber subscriber port address area of the subscriber subscriber table when judged to be a subscriber. A trunk line loop forming process (214) (215) for reading a port address and forming a loop of a corresponding trunk line, and assigning a channel of a trunk line formed in the trunk line loop forming process (214) (215) and assigning the subscriber subscriber channel assignment process. A method for exclusive use of CO line calls when a private line exchange is made by a call path connecting process (217) for connecting a subscriber channel allocated at 212 and a call path of the CO line channel.

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