JPS6234498A - System for setting one-way communication channel - Google Patents

Abstract

PURPOSE:To remove an influence of a return loss during measuring a characteristic of a channel by detecting a selecting signal transmitted from equipments connected to an exchange and breaking an optional and only one-way channel of bidirectional channels mutually connecting the equipments. CONSTITUTION:To an electronic exchange 111, telephone sets 112, 113 or other various types of terminal equipments are connected through subscriber's circuits 114, 115. When the telephone sets 112 and 113 are in a state of the bidirectional talking, a signal A is transmitted from the telephone set 112, after hooking, a signal detecting circuit 16 detects the hooking, a register 124 detects the signal A, a controller 126 operates to break the connection to the telephone set 112 from the telephone set 113 of a time shared switch 127 and only the one direction speaking to the telephone set 112 from the telephone set 113 is set.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a one-way communication path setting method, in particular, a one-way communication path setting method using selection signals from various terminals or exchanges connected to an electronic exchange.
The present invention relates to a unidirectional communication channel setting method for setting an arbitrary unidirectional communication channel.

[Conventional technology]

In conventional electronic exchanges, call lines from various terminals are connected to line circuits, call lines from other exchanges are connected to trunks, and call signals passing through the call lines are transmitted through their respective 2-wire to 4-wire conversion circuits. The signal and received signals are separated and connected via a time division switch to enable two-way communication.

[Problem that the invention seeks to solve]

As mentioned above, the conventional technology always sets communication paths in both directions, so when measuring the characteristics of the communication path system, it is possible that the signal on the transmitting side passes through the receiving side due to wraparound in the 2-wire to 4-wire conversion circuit. Since it was impossible to prevent the signal from returning to the transmitting side again, the measurement results were often adversely affected.

[Means for solving problems]

According to the present invention, a time-sharing electronic exchange is provided with a detection means for detecting a selection signal sent from equipment connected to the exchange, and an output of the detection means is used to connect the equipment to each other. A unidirectional communication channel setting method is obtained, which is characterized in that it is possible to disconnect or restore, or disconnect and restore, a communication channel in only one direction among the communication channels.

[Example〕 Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. Telephones tR112, 113 and other various terminals are connected to the electronic exchange 111 via subscriber circuits 114 and 115. The subscriber circuits 114 and 115 are respectively signal conversion circuits 116 and 117.2-4 line conversion circuit 11
8. 119. A/”D conversion circuit 120, 121.D
It consists of /A conversion circuits 112 and 123. Furthermore, the signal detection circuits 116 and 117 each have a register 1
24 and 125 to a control device 126, and the control device 126 controls a time division switch 127.

Next, we will explain its operation.0 There are two types of specific signals for setting up one-way calls.A is the setting from the specific signal sending side to the other party's side, and A is the setting from the other party's specific signal sending side. Let the case be B. Telephone 112,1
13 or other terminal (hereinafter referred to as a telephone) is in a two-way conversation state, when the telephone fil12 sends out signal A after hooking, the signal detection circuit 116 detects the hooking, and the register 124 detects the signal A. , the control device 126 operates to switch the time division switch 127 to the telephone 1.
13 to the telephone 112.

At that time, a confirmation sound is sent if necessary. Therefore, only one-way communication from telephone 112 to telephone 113 is set up.

Further, when the signal B is sent from the telephone 112, a one-way call from the telephone 113 to the telephone fil12 is similarly set up. After setting, 4G/confirmation sound will be sent if necessary. The same applies when a signal is sent from telephone 113.

In addition, to recover from the one-way call setting state, use the telephone fi11
2 or 113 is hooked, or hooked, or a specific dial is made after hooking, etc., and it is of course possible to combine these.

In addition, in order to avoid problems with one-way calls during normal exchange operation, at least one subscriber (in this case, 112,
113) is restored, it is necessary to completely cancel the one-way call setting.

FIG. 2 shows a case where a telephone 112 is connected to another exchange 211 via an electronic exchange 11. In FIG.

The exchange 211 is connected to the trunk circuit 212,
Other than that, it is the same as FIG. 1.

FIG. 3 shows a case where the electronic exchange 111 is connected to an exchange 311 that does not have a one-way call system. In this case, the telephone 312 connected to this exchange 311 has an adapter 313.
It becomes necessary to connect.

This adapter 313 has a function of sending a total of three types of signals A', B', and C', one for setting and one for canceling a unidirectional connection. These signals A' and B'.

C' is a certain determined voice signal, and the electronic exchange 111
If the transmission is confirmed by the signal detection circuit 117 in the adapter 313, the AC tA1!311 can be connected to the register 125, and if the signal corresponding to this hooking is first transmitted from the adapter 313, the control device 126 It is possible to control switch 127.

In addition, in the above explanation, one-way call setting signal A is used.

B always gives priority to the newer one, so connections in both directions will never be cut off at once. Furthermore, if the signal C is determined separately, restoration in both directions is possible from either side. In addition,
It is not necessary to hook before sending the configuration signal; it can also be achieved, for example, by using a special audible tone signal or by dialing suddenly.

〔Effect of the invention〕

As stated above, the present invention makes it possible to measure characteristics that eliminate the influence of return loss by setting one-way communication when measuring the characteristics of a communication path. By disconnecting the connection to the other party, it has the effect of being able to be used in the same way as a hold.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a case in which an exchange having a one-way communication system is connected in place of the telephone set in FIG. 1. FIG. 3 is a block diagram showing a case in which the connected exchange does not have a one-way call system in FIG. 2. 111...Electronic exchange, 1.12, 113.213.
...Telephone or other terminal, 114.115...
・Subscriber circuit, 116, 117...Signal conversion circuit, 1
18.119...2-wire to 4-wire conversion circuit, 120°12
0...A/D conversion circuit, 122, 123...D/A
Conversion circuit, 124, 125...Register, 126...
Control device, 127... Time division switch, 211...
Switchboard (with one-way communication system), 212...Trunk circuit, 311...Switchboard (with no one-way communication system).

Claims (1)

[Claims] A time-division type electronic exchange is provided with a detection means for detecting a selection signal sent from equipment connected to the exchange, and the output of the detection means is used to select any one of two-way communication paths that interconnect the equipment. A unidirectional communication channel setting method characterized by being capable of cutting or restoring or cutting and restoring a unidirectional communication channel.