JPH0550184B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a simultaneous talkie sending system for notifying subscribers of an abnormality when a system goes down in a subscriber line time division switch.

[Conventional technology]

The call path system of the D70 type automatic switching system, which is a time-division subscriber line switching system used in Japan, is as follows:
It consists of a concentrator and a distribution device. The line concentrator includes a subscriber line interface device that accommodates a plurality of subscriber circuits as a set of subscriber circuits, and a time-division line concentrator and monitor of audio signals converted from analog signals to digital signals in the subscriber circuits. It consists of a concentrator and communication path device that stores signals and control signals, and generates and distributes clocks. The line concentrator and the line concentrator are mounted on a plurality of line concentrator racks corresponding to the number of subscribers. The simultaneous talkie circuit of the D70 type automatic exchange having such a configuration is housed in each concentrator rack together with a concentrator and a concentrator channel device. According to FIG. 1, the line concentrator rack 1 is equipped with a plurality of subscriber circuit groups SCG1 to SCGM (maximum 8 pieces), and each subscriber circuit group is connected to the subscriber telephone set SUB11.
~Subscriber circuit SC1 in one-to-one correspondence with SUBMN
1~SCMN is installed. Subscriber line circuit group
Each of SCG1 to SCGM has 128 subscriber circuits.
It is installed for subscribers. Therefore, the maximum
It can accommodate 1024 subscriber telephones. The subscriber circuits SC11 to SCMN draw in subscriber lines and perform BORSCHT functions (call current supply B,
It has overvoltage protection O, ringing sound R, subscriber line status reading S, 2-wire/4-wire conversion H, codec C, test line lead-in T), but in FIG. 1, the test line lead-in related to the present invention is Only the subscriber line drop-in switches LT11 to LTMN of the function (T function) are shown. SCDV11 to SCDVMN in subscriber circuit
is a control circuit that controls the above BORSCHT function. The subscriber circuits SC11 to SCMN are grouped into N subscriber circuits SC11 to SC1N, . . .
..., each group of SCM1 to SCMN is a subscriber circuit group SCG
1 to configure each SCGM. N subscriber line drop-in lines l ₁₁ to _{l no} from each subscriber circuit are made into multiple sets within each subscriber circuit group, and are connected to the simultaneous talkie sending unit TKYU. The simultaneous talkie sending unit TKYU is composed of talkie sending circuits TKY1-TKYM corresponding to each of the subscriber circuit groups SCG1-SCGM, and a talkie control circuit TKYCONT for controlling the talkie sending circuits TKY1-TKYM. Each of the talkie sending circuits TKY1 to TKYM has the same configuration, and the detailed circuit configuration is shown in FIG. In the same figure, TKR is the talkie control circuit
Relays controlled by TKYCONT, tk ₀ to tk ₂ are contacts of relay TKR, and D is a Zener diode, which, if the telephone is a PB telephone, supplies the potential necessary to form a loop during off-hook. R indicates a limiting resistance, and E indicates a power source. When the exchange is normal, relay TKR is inactive,
Subscriber drop-in lines _{l11 to lno} from each subscriber circuit group SCG1 to SCGM are connected to a test device (not shown) via a contact point _tk1 . The other contact of the contact tk ₁ is connected to the transformer T of the talkie sound source via the Zener diode D and the contact tk ₀ . At this time, the talkie transmitting circuits TY1 to TKYM are connected to the transformer T in a duplex manner. Referring again to FIG. 1, the subscriber circuit control circuit SCCONT includes a subscriber circuit control memory (not shown), a signal distribution circuit (not shown), and a central control unit (not shown). After storing the subscriber circuit control information sent from the receiver in the receiving memory,
Control drive circuit for subscriber circuit with sequential signal distribution circuit
The signal is distributed to SCDV11 to SCDVMN.
The subscriber circuit that receives the signal operates electronic contacts that correspond to the pattern of the control information signal, and experiments various functions such as supplying communication current, sending and stopping a ringing signal, loopback test, and drawing in a test line. Next, the operation at the time of simultaneous talkie transmission will be explained. When it is determined that the exchange system is down, a maintenance person operates a telephone key to send a simultaneous talkie activation signal to the subscriber circuit control circuit SCCONT and the simultaneous talkie sending unit TKYU. The subscriber circuit control circuit SCCONT sends a control signal that turns on only the subscriber line switch in the subscriber circuit to the subscriber circuit control drive circuits SCDV11 to SCDV11.
Send to SCDVMN. As a result, all subscriber line drop-in switches LT11 to LTMN are turned on. On the other hand, the simultaneous talk transmission unit TKYU is
The talkie control circuit TKYCONT operates all the relays TKR in the talkie sending circuits TKY1 to TKYM, and the contacts tk ₀ to _{tk 2} are made. As a result, the talkie sound is transmitted from the transformer T to the talkie sending circuit.
TKY1 ~ TKYM → Subscriber line drop-in line l ₁₁ ~ l _no →
It is sent to the telephones SUB11 to SUBMN via the subscriber line drop-in switch LT11 to LTMN route.
Therefore, the off-hook subscriber hears a talkie tone and is informed that the exchange system is down.

[Problem to be solved by the invention]

In conventional time-division switching equipment, each talkie sending circuit TKY1 to TKYU of the simultaneous talkie sending unit TKYU
In TKYM, during simultaneous talkie transmission, current flows steadily through the route of power supply E → control resistor R → Zener diode D → transformer T, so Zener diode D and limiting resistor R are connected to heat sinks or large resistors. Measures are taken to prevent heat generation, such as using equipment. Then, there are M talkie sending circuits that require measures against heat generation.
Since TKY1 to TKYM are mounted in one place on one rack, each circuit has to be large in order to meet the thermal conditions, which poses a problem in miniaturizing the unit. Furthermore, the subscriber circuit groups SCG1 to SCGM are expansion units as the number of subscribers increases, but the simultaneous talkie sending unit TKYU is fixed in advance so that it can accommodate all the subscriber circuit groups that can be installed on one rack. Since the system is located in a central area, there is a problem in that it becomes uneconomical when the number of subscribers is small.

[Means to solve the problem]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems by distributing talkie sending circuits corresponding to a group of subscriber circuits, and to provide a talkie sending system that is easy to implement and economical. The talkie sending system of the present invention is a time-division exchange consisting of a plurality of racks, and at least one of the plurality of racks has a plurality of subscriber circuits each having a subscriber line drop-in switch corresponding to the subscriber line. It has a talkie sending circuit, and the plurality of subscriber circuits are divided into a plurality of subscriber circuit groups each consisting of N subscriber circuits, and N subscriber line drop-in lines in each subscriber circuit group are connected in a duplex manner. In the talkie transmission system of the time division exchange connected to the talkie transmission circuit, each subscriber circuit group is provided with a talkie transmission circuit and a talkie drive circuit, and
A common control circuit is provided for each subscriber circuit group in the rack,
The talkie sending circuit is connected to the subscriber line drop-in line in the corresponding subscriber circuit group, and is connected to the talkie sound source by being connected to the talkie sending circuit in the other subscriber circuit group in the same rack. Further, the talkie drive circuit and subscriber circuit control drive circuit in each subscriber circuit group are connected to the control circuit, and the talkie sending circuit and subscriber line lead-in circuit in each subscriber circuit group are connected to the control circuit by a simultaneous talkie activation signal. It is characterized by operating a switch to send a talkie to a telephone.

【Example】

FIG. 3 is a block diagram showing an embodiment of the talkie sending system of the present invention. In the figure, the talkie transmission system of the present invention includes subscriber circuit groups SCG1 to SCGM, talkie transmission circuits TKY1 to TKYM, and talkie drive circuits.
TKYDV1 to TKYDVM are installed in a distributed manner, and a control circuit CONT is provided commonly to all subscriber circuit groups SCG1 to SCGM. The talkie sending circuits TKY1 to TKYM are connected to corresponding talkie drive circuits TKYDV1 to TKYDVM, respectively. In addition, the control circuit CONT is a subscriber circuit control drive circuit SCDV11 to SCDV11 in the subscriber circuit.
SCDVMN and the above talkie drive circuit TKYDV1~
Connected to TKYDVM. Other configurations in this embodiment are shown in FIGS. 1 and 2 described above.
It is similar to that shown in the figure. Next, the operation of the talkie transmission system of the present invention will be explained with reference to FIG. During normal operation of the exchange, the control circuit CONT receives subscriber circuit control commands (SD signals) sent from the central control unit (not shown) and connects the electronic contacts (SD points) of each subscriber circuit SC11 to SCMM. ), and by changing their combination, controls the supply of communication current, sending and stopping of the calling signal, return test, drawing of the test line, etc. On the other hand, when it is determined that the exchange system is down, a simultaneous talkie activation signal is sent to the control circuit CONT by a maintenance person's key operation. control circuit
CONT is a control signal that autonomously generates a signal pattern for talkie transmission and turns on only the subscriber line drop-in switches LT11 to LTMN in each subscriber circuit SC11 to SCMN, and a talkie transmission circuit TKY.
The control signal for operating the relay TKR (Fig. 2) of 1 to TKYM is connected to the subscriber circuit control drive circuit.
SCDV11 to SCDVMN and talkie drive circuit
Send to TKYDV1 to TKYDVM. Furthermore, compared to the conventional subscriber circuit control circuit SCCONT, the control circuit CONT requires only the addition of one control signal bit to the conventional control signal for controlling the on/off of the talkie drive circuit, and requires less hardware. There is almost no difference in quantity. All relays in the subscriber line drop-in switches LT11 to LTMN and the talkie sending circuits TKY1 to TKYM that receive control signals from the control circuit CONT operate, and the talkie sound source → transformer T → talkie sending circuits TKY1 to TKYM → subscriber line drop-in line l ₁₁
~l _no →Subscriber line drop-in switch LT11~
In the LTMN route, the talkie tone is heard on the subscriber phone.
It is sent to SUB11 to SUBMN, and can be heard by a subscriber in an off-hook state as a talkie tone. While the talkie transmission circuits TKY1 to TKYM are in operation, each subscriber circuit SC11 to SCMN is in an off state.
Since only the subscriber line drop-in switch is in the on state, the talkie sending circuits TKY1 to TKYM in each subscriber circuit SCG1 to SCGM only need to consider the heating conditions of their own circuits, and the talkie sending circuits of other subscriber circuit groups There is no need to consider TKY1 to TKYM. Therefore, miniaturization has been achieved, and it has become possible to accommodate each subscriber circuit group.

【Effect of the invention】

As explained above, the present invention realizes miniaturization of the device by distributing the talkie sending circuit to the subscriber circuit group and installing the control circuit in common with that of the subscriber circuit. Economization is also realized by being included in the expansion unit.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional talkie transmission system. FIG. 2 is a circuit diagram showing details of the talkie sending circuit. FIG. 3 is a block diagram showing an embodiment of the talkie sending system of the present invention. SUB11~SUBMN: Subscriber telephone, SCG1
~SCGM: Subscriber circuit group, SC11~SCMN: Subscriber circuit, SCDV11~SCDVMN: Control drive circuit for subscriber circuit, LT11~LTMN: Subscriber line drop-in switch, _l11 ~ _lno : Subscriber line drop-in line,
TKY1 to TKYM: Talkie sending circuit, TKYDV
1~TKYDVM: Talkie drive circuit, CONT:
control circuit.

Claims (1)

[Scope of Claims] 1. A time division switching system comprising a plurality of racks,
At least one of these multiple racks has a plurality of subscriber circuits and a talkie sending circuit each having a subscriber line entry switch corresponding to the subscriber line, and each of the plurality of subscriber circuits is formed into a set of N circuits. In a talkie transmission system of a time-division exchange that is divided into a plurality of subscriber circuit groups, and N subscriber line drop-in lines in each subscriber circuit group are connected to the talkie transmission circuit, each of the above-mentioned A talkie sending circuit and a talkie drive circuit are provided in each circuit group, and
A common control circuit is provided for each subscriber circuit group in the rack,
The talkie sending circuit is connected to the subscriber line drop-in line in the corresponding subscriber circuit group, and is connected to the talkie sound source by being connected to the talkie sending circuit in the other subscriber circuit group in the same rack. Further, the talkie drive circuit and subscriber circuit control drive circuit in each subscriber circuit group are connected to the control circuit, and the talkie sending circuit and subscriber line lead-in circuit in each subscriber circuit group are connected to the control circuit by a simultaneous talkie activation signal. A simultaneous talkie sending method characterized by operating a switch to send talkies to telephones.