JPH0556177A - Connection system and interface circuit wayside telephone system - Google Patents

Abstract

PURPOSE:To attain the connection system of a wayside telephone system of which singing margin is large and of which noise is small in reference to the wayside telephone system where plural telephone sets are connected to one line. CONSTITUTION:A first interface circuit 40 is provided for a master station 100 and a second interface circuit 60 is provided for a slave station 200 in the wayside telephone system consisting of the master/slave stations 100 and 200. At the time of calling from the telephone set of the master station 10 to that of the slave station 70, the second interface circuit 60 receives an incoming signal and connects a hybrid ring, unit 50 to a 4-wire line. Then, at the time of calling from the telephone set of the slave station 70 to that of the master station 10, the second interface circuit 60 detects the calling signal of the telephone set of the slave station 70 and connects the hybrid ring unit 50 to the 4-wire line. The first interface circuit 40 of the master station 100 detects the incoming signal from the slave station 200 and executes connection with the 4-wire receiving line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wayside telephone system in which a plurality of telephones are connected to one line. In the field of railway communication and highway communication, a communication line is laid along a railroad or along the road. For communication in an emergency or emergency, for example, a jack for a telephone is provided at intervals of 500 m. There is.

When performing communication, a telephone plug is inserted into a jack of a communication line, a generator in the telephone is turned to make a call, and then a call is made. In such a wayside telephone system, a command telephone system, etc., the total extension distance of the line becomes long, and the number of connected slave stations often increases.

In such a wayside telephone system and a command telephone system, a connection system with a large singing margin and a small noise is required.

[0004]

2. Description of the Related Art FIG. 5 shows a diagram for explaining a conventional example. In the figure, 10 is a master station telephone, 20 and 50 are hybridizing units (shown as H in the figure), 20A and 50A are echo cancellers shown as EC in the figure), and 70 is a slave station phone.

The slave station telephone 70 used in the wayside telephone system laid along the expressway is portable and can be carried. For example, when the road administrator makes a patrol and checks and finds an abnormality, the plug of the slave station telephone 70 is inserted and connected to the nearest telephone jack and the telephone call with the master station telephone 10 is performed.

In the wayside telephone system, as shown in the figure, 1:
It has a unique line configuration that uses multiple n lines,
Since the oscillation and the singing phenomenon are likely to occur due to the signal wraparound, the echo canceller 20 is provided in order to suppress them.
A and 50A are used.

[0007]

In the above-mentioned conventional example, even if the echo cancellers 20A and 50A are used to eliminate the occurrence of echo under a certain condition, the use condition is variously changed and the line condition is also changed. Since it varies depending on the season and time, it is impossible to eliminate oscillation and singing phenomenon,
In addition, the noise also increases as the sum of the noise of each line.

The present invention intends to realize a connection system for a wayside telephone system having a large singing margin and a small noise.

[0009]

FIG. 1 is a block diagram for explaining the principle of the present invention. 100 in the figure is a master station,
Reference numeral 10 in the master station 100 is a 2-wire (hereinafter referred to as 2W) master station telephone, and 20 is a hive for converting a 2W signal input / output to / from the master station telephone 10 into a 4-wire (hereinafter referred to as 4W) signal. A ring unit, and 30 is a resistor that terminates the hybridizing unit 20.

Reference numeral 200 is a slave station, 50 in the slave station 200 is a hybridizing unit for converting a 4W signal into a 2W signal, and 40 is a 4WS signal which is provided in the master station 100 and passes 4WR. Is a first interface circuit for disconnecting the signal, and 60 is normally provided in the slave station 200 and is disconnected from the normal 4W line, and an incoming signal from the master station telephone 10 and a slave station telephone of the slave station 200 are provided. This is a second interface circuit for connecting to a 4W line in response to a transmission signal from the master station telephone 10 to the slave station telephone 70.
The second interface circuit 60 receives the incoming signal to connect the hybridizing unit 50 and the 4W line to enable a call, and when the call is made from the slave station telephone 70 to the master station telephone 10. , The second interface circuit 60 detects the calling signal of the slave station telephone 70,
Connect the hybridizing unit 50 to the 4W line,
The first interface line 40 of the master station 100 is the slave station 20.
It detects the incoming signal from 0 and connects to the 4WR line.

[0011]

The 4 W signal output from the hybridizing unit 20 of the master station 100 is connected to the first interface line 40. The 4WS side of the first interface circuit 40 is always connected, and the 4WR side is kept in the “off” state by the switches 41 and 42.

The second interface circuit 60 of the slave station 200 uses the switches 61 and 62 to keep the 4W line and the hybridizing unit 50 in the "off" state. When calling the slave station telephone 70 from the master station telephone 10 in this state, the second interface line 60 is connected to the master station 1
When the incoming signal from 00 is received, the switches 61 and 62 are turned on to connect the 4W line and the hybridizing unit 50.

When the master station telephone 10 is called from the slave station telephone 70, the second interface line 60 detects the call signal from the slave station telephone 70 and switches 61, 6
2 is turned on and 4W line and hybridizing unit 5
Connect 0.

Next, the calling signal is the first signal of the master station 100.
Input to the interface line 40 of the switch 4 and the first interface line 40 detects the call signal and
The 1 and 42 are turned “on” to connect the 4WR line.

Therefore, from the master station 100 to the slave station telephone 7
When 0 is called, only the responding slave station telephone 70 is connected to the line. When calling the master station 100 from the slave station telephone 70, only the calling slave station telephone 70 is connected to the line. The non-hybridizing unit 50 is disconnected from the line to have a 1: 1 line configuration, and singing and noise can be reduced.

[0016]

FIG. 2 is a diagram for explaining a master station interface circuit according to an embodiment of the present invention. 10 in the figure is a master station telephone, 2
Reference numeral 0 is a hybridizing unit, 30 is a terminating resistor, 40A is a master station interface circuit as the first interface circuit 40, 41 and 42 are switches, 43 and 44 are terminating resistors, and 45 is control of the switches 41 and 42. A logic circuit (shown as LOGIC in the figure) and sr are contacts that are turned “on” when the carrier terminal device (not shown) detects the incoming signal SR.

In the figure, the master station interface circuit 40
The 4WS line side of A is always connected. On the other hand, 4
On the WR line side, the switches 41 and 42 turn them “off” and connect them to the terminating resistors 43 and 44, respectively.

When the contact sr of the carrier terminal device is turned "on", the logic circuit 45 detects the ground and switches the switches 41 and 42 to the broken line side to connect the 4WR line.

FIG. 3 is a diagram for explaining a slave station interface circuit according to the embodiment of the present invention. In the figure, 60A is a slave station interface circuit as the second interface circuit 60, 61 and 62 are switches, 63 is a control circuit, 64 is a logic circuit, and 65 is a detector for detecting a calling signal of a voice band frequency. is there.

In the figure, a slave station interface circuit 60
The 4W line of A is normally connected by the switches 61 and 62.
It says "off". Here, the logic circuit 64 in the control circuit 63 detects an incoming signal from the master station 100 and a calling signal from the slave station 200, switches the switches 61 and 62, and connects the 4W line and the hybridizing unit 50.

When an F-type telephone that uses a calling signal of the voice band frequency as the calling signal is used, the detector 65 detects the calling signal of the voice band frequency,
The detection result is input to the logic circuit 64, and the switches 61 and 6
2 is controlled.

Further, an input / output signal for the control circuit 63, "B
"USY" is a signal indicating that the slave station telephone 70 is in use, "R
“C” is a remote recovery signal from the master station 100, “MAN”
Indicates a manual reset signal.

FIG. 4 is a diagram of a slave station interface circuit according to an embodiment of the present invention. RS, RR, RW, RY, RZ in the figure
Is a coil of a relay, rs, rr, rw, ry, and rz are contacts of relays RS, RR, RW, RY, and RZ, R1 to R
3 is a resistor, FD is a detector for a calling signal of a frequency in the voice band (shown as FS DET in the figure), and fd is a detector F
D contacts, L LEDs, and PB push buttons.

The operation of the slave station interface circuit 60A will be described. When calling the master station from the slave station phone. -Connect the slave station telephone 70 to the telephone jack and turn the generator.

The hybridizing unit 50 detects the calling signal and detects the SS of the slave station interface circuit 60A.
Send the ground to.・ Relay RZ operation → Relay RS, RR by contact rz
Operation: → The relays RS and RR are self-held by the contacts rs and rr, and 4WS and 4WR are connected by the contacts rr and rs.

When calling a slave station telephone from the master station. The SR line of the channel board of the carrier terminal device (not shown) on the slave station 200 side sends out to the ground. When an F-type telephone is used, the detector FD detects a calling signal from the master station 100.

Relay RY operation → relay RS by contact ry, RR operation → relay RS by contact rs, rr
RR self-holds and connects 4W line. Release after completion of call-The master station 100 sends release signals RC all at once.

Relay RW operation → The contact rw releases the self holding of the relays RS and RR and restores the original state.・ In case of manual recovery, push button PB to reset.

Further, the LED is for indicating that a call is in progress, and BUSY is a contact point for outputting during a call.

[0030]

According to the present invention, the singing margin can be greatly improved and the stability of the communication line can be increased. Also,
The noise of the line structure of 1: n is connected to only the telephone set to be used, so that the line structure becomes 1: 1 and the line noise is improved. Furthermore, since the singing margin can be greatly improved and the line noise can be improved, the line length can be lengthened, and multiple lines with a 1: n line configuration can be combined into one line, improving line efficiency. Can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating the principle of the present invention.

FIG. 2 is a diagram illustrating a master station interface circuit according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a slave station interface circuit according to an embodiment of the present invention.

FIG. 4 is a slave station interface circuit diagram of an embodiment of the present invention.

FIG. 5 is a diagram illustrating a conventional example.

[Explanation of symbols]

100 master station 200 slave station 10 master station telephone 20,50 hybridizing unit 20A, 50A
Echo canceller 30, 43, 44, R1 to R3 terminating resistor 40 First interface circuit 40A Master station interface circuit 41, 42, 61, 62 Switch 45, 64
Logic circuit 60 Second interface circuit 60A Slave station interface circuit 63 Control circuit 65, FD detector fd Contact point of detector FD 70 Slave station telephone RS, RR, RW, RY, RZ Relay rs, rr, rw, ry, rz Relay contact PB Push button L LED

Claims (3)

[Claims] 1. A line connection method of a wayside telephone system in which a plurality of telephones are connected to one line, wherein a master station (100) is a two-wire (2W) master station phone (10), 2 wires (2W) to input / output to the master station telephone (10)
And a resistor (3) for terminating the hybridizing unit (20) for converting the signal of 4 to a signal of 4 wires (4W).
0) and the slave station (200) includes a hybridizing unit (50) for converting a signal of 4 wires (4W) into a signal of 2 wires (2W), the master station (100) ) Is provided with a first interface circuit (40) that passes a signal of 4-wire transmission (4WS) and disconnects a signal of 4-wire reception (4WR), and the slave station (200) normally has a 4-wire signal. The connection with the (4W) line is cut off, the incoming signal from the master station telephone (10) and the slave station telephone (7) of the slave station (200).
A second interface circuit (60) for connecting to a 4-wire (4W) line in response to an outgoing signal from (0), and when calling from the master station telephone (10) to the slave station telephone (70), The second interface circuit (6
0) receives the incoming signal from the master station (100),
4 wires (4W) for the hybridizing unit (50)
Connected to the line to enable communication,
0) to the master station telephone set (10), the second interface circuit (60) detects the calling signal of the slave station telephone set (70) and switches the hybridizing unit (50) to 4 A connection is made to a wire (4W) line, and the first interface circuit (40) of the master station (100) detects an incoming signal from the slave station (200) to establish a 4-wire reception (4WR) line. A method of connecting a wayside telephone system, which is characterized by making connections. 2. The first interface circuit (40)
Is equipped with switches (41, 42) which are operated by an incoming signal (SR) from the carrier terminal device, and 4-wire transmission (4W
S) line is always connected and 4-wire reception (4
The interface circuit is characterized in that the WR line is connected by detecting an incoming signal from the slave station telephone (70). 3. The second interface circuit (60)
Is equipped with switches (61, 62) operated by an incoming signal from the master station telephone (10) and a calling signal from the slave station telephone (70), and the incoming signal from the parent station telephone (10), An interface circuit characterized by detecting a call signal from a slave station telephone (70) and connecting a 4-wire transmission / reception (4WSR) line.