JPH0470130A - Repeater - Google Patents

Abstract

PURPOSE:To transmit packet signals, etc., even when the packet signals to be transmitted from plural terminals collide between transmission lines in various feeding states by outputting control signals to first and second power feeding circuit switches and a cross switch based on the output control signals of first and second power supply polarity detection circuits. CONSTITUTION:This system is composed of a junction circuit 11, first polarity detection circuit 14, second polarity detection circuit 15, first power feeding circuit switch 16, second power feeding circuit switch 17, control circuit 18 and cross switch 19. Then, even when the polarities of direct current power sources to be fed to first and second transmission lines 2 and 3 are different, the difference between the feeding states of the power sources is automatically detected and further, the states are made adaptive to be coincident. Thus, even when the packet signals transmitted from the plural terminals collide, competition is executed by the junction circuit so as to normally transmit the packet signals.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a relay device that transmits control signals and the like between transmission lines by adapting the power supply state even between transmission lines with different power supply states.

[Prior Art] When constructing a network system, a relay device is installed between transmission lines to electrically combine transmission lines with different power supply states into a single transmission route, and the power supply state, signal level, etc. Adjustments such as waveform shaping are being made.

Here, a functional block diagram of a conventional relay device is shown in FIG. Examples of relay devices are shown in FIGS. 5(A) to 5(D).

Device configuration description: In FIG. 5(A), the relay device (1) has a relay circuit (1
It consists only of 1).

In FIG. 5(B), the relay device (1) is a relay circuit (1
1) and a first power supply circuit (12).

In FIG. 5(C), the relay device (1) is a relay circuit (1
1) and a second power supply circuit (13).

In FIG. 5(D), the relay device (1) is a relay circuit (1
1), a first power supply circuit (12), and a second power supply circuit (
13).

Explanation of device connection relationship: In FIGS. 5(A) to (D), the first transmission path (2) (
The (+) side is connected to the input (11a) of the relay circuit (11), the (-) side is connected to the output (1l b) of the relay circuit (11), and the (+) side of the second transmission line (3) The side is a relay circuit (1
1), and the (-) side is connected to the output (lld) of the relay circuit (11).

In FIG. 5(B), a first power supply circuit (12) is connected to the first transmission line (2).

In FIG. 5(C), a second power supply circuit (13) is connected to the second transmission line (3).

In FIG. 5(D), a first power supply circuit (12) is connected to the first transmission line (2), and a second power supply circuit (13) is connected to the second transmission line (3). Ru.

Description of device operation: The first transmission line (2) and the second transmission line (3) are provided with an AMI (Alternate) signal as a control signal, for example.
eMark Inversion) signal is transmitted.

The transmission format of this control signal is shown in FIG.

The transmission format of the control signal has a 1-bit start bit, 8-bit data bits, 1-bit parity bit, and 1-bit stop bit.

Figure 6 (A) shows the signal waveform on the (+) side of the transmission line, with the bias voltage 24V centered at -, and +5 on the (+) side.
It has a pulse height of V, and also has a pulse height of -5V on the (-) side.

Figure 6 (B) shows the signal waveform on the (-) side of the transmission line, with Ov as the center, a pulse height of +5V on the (+) side, and a pulse height of -5V on the (-) side as well. has.

In FIG. 5(A), the relay device t (1) is connected between the first transmission path (2) and the second transmission path (3), and the relay device t (1) is connected between the first transmission path (2) and the second transmission path (3). Since the second transmission line (3) is not supplied with power, normal packet communication cannot be performed because no DC power is supplied to the packet signals transmitted from both terminals between the transmission lines.

In the relay device (1) in FIG. 5(B), the first transmission line (2) is supplied with DC power from the first power supply circuit (12), but between the transmission lines, both terminals Normal packet communication is not possible because the polarity of the transmitted packet signals is different.

In the relay device (1) of FIG. 5(C), the second transmission line (3) is supplied with DC power from the second power supply circuit (13), but the first transmission line (2) Since no DC power is supplied to the terminal, normal packet communication cannot be performed because the polarities of the packet signals transmitted from both terminals on the transmission line are different.

In the relay device (1) in FIG. 5(D), since DC power is supplied to both the first transmission line (12) and the second transmission line (13), both terminals between the transmission lines The polarities of the packet signals transmitted from the relay circuit (11) match, and the AMI signal input to the relay circuit (11) compensates for waveform deterioration due to transmission line loss, and the predetermined AMI signal is routed to the second transmission line (3). is output and normal packet communication is possible.

[Problems to be Solved by the Invention] However, in the conventional relay device, if the power supply states of the DC power supplies of the first transmission line (2) and the second transmission line (3) are different, the transmission from multiple terminals is When packet signals collide, it is not possible to achieve contention, so there is a problem in that packet communication cannot be performed normally.

The present invention has been made in view of the above-mentioned problems, and its purpose is to adapt the power supply state even between transmission lines with different power supply states, so that even when packet signals transmitted from multiple terminals collide, the transmission path An object of the present invention is to provide a relay device that transmits packet signals and the like between the two.

[Means for Solving the Problems] In order to achieve the above object, the present invention has improved a relay device.

That is, the first means includes a relay circuit that adjusts and outputs an input signal, and in a relay device connected between a first transmission path and a second transmission path, a power source of the first transmission path A first power supply polarity detection circuit that detects the polarity and outputs a control signal, a second power supply polarity detection circuit that detects the power supply polarity of the second transmission line and outputs a control signal, and A first power supply circuit switch that controls whether or not power is supplied to the first transmission path, and a second power supply circuit switch that controls whether or not power is supplied to the second transmission path based on an input control signal. The power supply circuit switch and the first switch based on the input control signal.
or a cross switch that inverts or non-inverts the power supply polarity of the input signal of one of the second transmission lines and outputs it to the relay circuit, and an output control signal of the first power supply polarity detection circuit and the second power supply polarity. It is characterized in that it is comprised of a control circuit that outputs a control signal to the first power supply circuit switch, the second power supply circuit switch, and the cross switch based on the output control signal of the detection circuit.

Another second means includes a relay circuit that adjusts and outputs an input signal, and in a relay device connected between a first transmission path and a second transmission path, the power source of the first transmission path a first power supply polarity detection circuit that detects polarity and outputs a control signal;
a second power supply polarity detection circuit that detects the power supply polarity of the second transmission line and outputs a control signal; and one transmission line of the first transmission line or the second transmission line based on the input control signal. a third power supply circuit switch that controls the power supply polarity to be inverted or non-inverted and supplies the power supply; A control circuit that outputs a control signal to a circuit switch.

[Function] According to the present invention, even if the polarities of the DC power supplies supplied to the first transmission line and the second transmission line are different, the difference in the power supply state of the power supplies is automatically detected and further matched. Therefore, even if packet signals transmitted from a plurality of terminals collide, it is possible to maintain normal transmission of the packet signals by attempting to compete in the relay circuit.

[Example] A first example and a second example of a relay device according to the present invention will be described below with reference to the drawings.

Description of the first embodiment.

FIG. 1 shows a functional block diagram of a first embodiment of a relay device according to the present invention. FIG. 2 shows the operation of the main parts of the relay device shown in FIG. 1.

Device configuration description; The relay device (1) according to the present invention includes a relay circuit (11),
A first polarity detection circuit (14) and a second polarity detection circuit (
15), a first power supply circuit switch (16), a second power supply circuit switch (17), a control circuit (18), and a cross switch (19).

The first and second power supply circuit switches (16, 17) include a DC power supply.

Description of device characteristics and connections: The (+) side of the first transmission line (2) is connected to the j of the relay circuit (11).
The (-) side is connected to the first output (llb) of the relay circuit (11), and the second input (11C) of the relay circuit (11) is connected to the input (lla) of the relay circuit (11).
9) is connected to the first output (19a) of the relay circuit (19a).
The second output (lld) of 1) is the cross switch (19)
is connected to the first input (19b) of the second transmission line (3
The (+) side of the input terminal is the second input (
19C), and the (-) side is connected to the cross switch (19C).
) is connected to the second output (19d) of the first transmission line (
The (+) side of 2) is the human power (
14a), and the (-) side of the first transmission line (2) is connected to the first output (14b) of the first power supply polarity detection circuit (14).
) of the first power supply polarity detection circuit (14).
The output (14C) of the control circuit (18) is the first input (1
8a), and the (+) side of the first transmission line (2) is connected to the first power supply circuit switch (17) via the coil (22).
The (-) side of the first transmission line (2) is connected to the output (17b) of the first power supply circuit switch (17) via the coil (23). connected to,
The second input (17c) of the first power supply circuit switch (17)
) is connected to a first output (18c) of the control circuit (18), a second output (18d) of the control circuit (18) is connected to a third input (19e) of the cross switch (19),
The (+) side of the second transmission line (3) is connected to the second power source via the input (15a) of the second power supply polarity detection circuit (15) and the coil 20.
The (-) side of the second transmission line (3) is connected to the first output (15b) of the second power supply polarity detection circuit (15). ) and the output of the second power supply circuit switch (16) via the coil 21 (
16b), and the second power supply polarity detection circuit (15)
The second output (15c) of the control circuit (18) is connected to the second input (18b) of the control circuit (18), and the third output (18e) of the control circuit (18) is connected to the second feed circuit switch (16). Second
is connected to the input (16c) of.

The cross switch (19) is internally connected based on an inverted or non-inverted control signal input to a third input (19e), and in the case of an inverted control signal input, 19a) and (19d) are connected (19b). ) and (19C) are connected. Further, in the case of non-inverting control signal input, (19a) and (19c) are connected, and (1b) and (19d) are connected.

A DC power supply is connected to the first power supply circuit switch (17) (and the second power supply circuit switch (16)), and the (+) side of the DC power supply is connected to 176 (16d).
) side is 17e (16e)l: connected.

Device operation description: FIG. 2 shows the operating state of the relay device according to the first embodiment.

The operation for each state will be explained below.

Condition ■: When the first transmission line (2) and the second transmission line (3) are not initially supplied with DC power, the first power supply polarity detection circuit (14) determines that power is not supplied. Control circuit (18
) outputs a signal indicating that power is not being supplied.

The control circuit (18) outputs a power supply request signal to the first power supply circuit switch (17) based on the manually inputted signal. 1st
The power supply circuit switch (17) is turned on and switches the DC power supply to the coil (22) and (23) based on the input power supply request signal.
) to the first transmission line (2). Therefore, the (+) power supply is supplied to the first input (11a) of the relay circuit (11), and the (-) power supply is connected to the first output (llb).

Furthermore, the power supply polarity detection circuit (15) of the power tube 2 also determines that power is not being supplied to the second transmission line (3), and the control circuit (18) determines that power is not being supplied to the second transmission line (3).
) outputs a signal indicating that power is not being supplied.

The control circuit (18) outputs a power supply request signal to the second power supply circuit switch (16) based on the input signal. Second
The power supply circuit switch (16) is turned on to connect the DC power supply to the coil (20) and (21) based on the human-powered power supply request signal.
) to the second transmission line (2). Therefore, the second input (19C) of the cross switch (19) has (+)
Power is supplied, and a (-) power source is connected to the second output (19d).

Since the first transmission line (2) and the second transmission line (3) were not initially supplied with DC power, the control circuit (18) outputs a non-inverting control signal to the cross switch (19). . Since the input signal to the cross switch (19) is a non-inverting control signal, the first output (19a) is internally
is also connected to the input (19c) of the first input (19b).
is connected to the second output (19d).

Depending on the state of the cross switch 19, the relay circuit (1
A positive power supply is supplied to the second input (11c) of 1), and a negative power supply is supplied to the second output (11d).

With the above operation, the first relay circuit (11) is
This means that the polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, and even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (1) ) to prevent normal transmission of packet signals from crossing switches (
19).

Condition ■: If a positive or negative polarity DC power is already supplied to the (+) side of the first transmission line (2) and no DC power is supplied to the second transmission line (3), First power supply polarity detection circuit (
14) detects the polarity of the DC power supply being fed to the (+) side or (-) side of the first transmission line (2) and outputs the information to the control circuit (18). Second power supply polarity detection circuit (
15) determines that the DC power source is not being supplied with power, and outputs a signal indicating that power is not being supplied.

The control circuit (18) does not output a power supply request signal to the first power supply circuit switch (17) because the information output from the first power supply detection circuit (14) is information indicating that power is being supplied. Therefore, the first power supply circuit switch (17) is turned off and no DC power is supplied to the first transmission line (2) via the coils (22) and (23).

In addition, the power supply polarity detection circuit 8 (15) of the power tube 2 determines that the DC power is not being supplied to the second transmission line (3), and sends a signal indicating that the power is not being supplied to the control circuit (18). Output.

The control circuit (18) outputs a power supply request signal to the second power supply circuit switch (16) based on the input signal. Second
The power supply circuit switch (16) is turned on and switches the DC power supply to the coil (20) and (21) based on the input power supply request signal.
) to the second transmission line (2). Therefore, the second input (19c) of the cross switch (19) has (+)
Power is supplied, and a (-) power source is connected to the second output (19d).

Since the second transmission line (3) was not initially supplied with DC power, the control circuit (18) was connected to the cross switch (19).
Outputs a non-inverting control signal to the Cross switch (
Since the input signal of 19) is a non-inverted control signal, the first output (19a) is internally connected to the second input (19c), and the first input (19b) is connected to the second output (19d).
) is connected.

Depending on the state of the cross switch (one), a positive power source is supplied to the first input (11a) of the relay circuit (11), a negative power source is supplied to the first output (llb), and a negative power source is supplied to the first output (llb) of the relay circuit (11). Positive power is supplied to the human power (11C), and the second output (1
, 1d) are supplied with a negative power supply.

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) The cross switch (
19).

Condition ■.

DC power is not supplied to the first transmission line (2),
When a positive or negative DC power supply is supplied to the (+) side of the second transmission line (3), the first power supply polarity detection circuit (14)
determines that the DC power supply is not being supplied and outputs a signal indicating that it is not supplied with power, and the second power supply polarity detection circuit (15) is connected to the (+) side of the second transmission line (3) or (-)
The polarity of the DC power supply that is being fed to the side is detected and the information is output to the control circuit (18).

The control circuit (18) outputs a power supply request signal to the first power supply circuit switch (17) because the information output from the first power supply polarity detection circuit (14) is information indicating that power is not supplied. Therefore, the first power supply circuit switch (17) is turned on, and the positive power of the DC power supply is supplied to the (+) side of the first transmission line (2), and the negative power is supplied to the (-) side of the coil (22). and (23) to the first transmission line (2).

On the other hand, the second power supply polarity detection circuit (15) determines that the DC power supply is already being supplied to the second transmission line (3) and outputs information on the polarity of the DC power supply to the control circuit (18). do.

The control circuit (18) does not output a power supply request signal to the second power supply circuit switch (16) based on the input information. The second power supply circuit switch (16) is turned off and the DC power is passed through the coils (20) and (21) to the second transmission path (3).
) is not supplied. The control circuit (18) outputs a non-inverting control signal to the cross switch (one). The cross switch (one) has a non-inverting control signal, so internally the first output (19a) is connected to the second input (19a).
c) and the first input (19b) is connected to the second output (19d).

Depending on the state of the cross switch (one), the first input (11a) of the relay circuit (11) is supplied with positive power, the first output (11b) is supplied with negative power, and the second The input (llc) is supplied with a positive power supply, and the second output (llc)
id) is connected to a negative power supply.

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) The cross switch (
19).

Condition ■: Positive DC power is supplied to the (+) side of the first transmission line (2), and positive DC power is also supplied to the (+) side of the second transmission line (3). If so, the first power polarity detection circuit (14) outputs information indicating that the positive DC power is being supplied, and the second power polarity detection circuit (15) outputs information indicating that the positive DC power is being supplied. The control circuit (1
8).

The control circuit (18) does not output a power supply request signal to the first power supply circuit switch (17) because the information output from the first power supply polarity detection circuit (14) is information indicating that power is being supplied.

Therefore, the first power supply circuit switch (17) is turned off and no DC power is supplied to the first transmission line (2).

In addition, since the power supply polarity detection circuit (15) of the power tube 2 has already been supplied with DC power to the second transmission line (3), it outputs information indicating that power is being supplied to the control circuit (18). )
is the second power supply circuit switch (1) based on the input information.
6) Do not output a power supply request signal. Therefore, the second power supply circuit switch (16) is turned off and the DC power supply is connected to the coil (
20) and (21) to the second transmission line (3).

Furthermore, since DC power with the same polarity is supplied to the first transmission line (2) and the second transmission line (3), the control circuit (18
) outputs a non-inverting control signal to the cross switch (19). Since the input signal is a non-inverting control signal, the cross switch (19) internally outputs the first output (19a).
is connected to the second input (19c) and also connected to the first input (19c).
9b) is connected to the second output (19d).

Depending on the state of the cross switch (19), a positive power supply is supplied to the first input (11a) of the relay circuit (11), a negative power supply is supplied to the first output (11b), and a negative power supply is supplied to the first input (11b) of the relay circuit (11). (11c) is supplied with a positive power supply, and the second output (1
1d) is connected to a negative power supply.

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) The cross switch (
19).

Condition ■: Positive DC power is already being supplied to the (+) side of the first transmission line (2), and negative DC power is already being supplied to the (+) side of the second transmission line (3). If supplied, the first power polarity detection circuit (14) outputs information indicating that positive DC power is being supplied, and the second power polarity detection circuit (15)
outputs information indicating that a negative DC power source is being supplied to the control circuit (18).

The control circuit (18) does not output a power supply request signal to the first power supply circuit switch (17) because the information output from the first power supply polarity detection circuit (14) is information indicating that power is being supplied.

Therefore, the first power supply circuit switch (17) is turned off and no DC power is supplied to the first transmission line (2).

On the other hand, since the second power supply polarity detection circuit (15) has already been supplied with DC power to the second transmission line (3), it outputs information indicating that power is being supplied to the control circuit (18), and the control circuit (18)
is the second power supply circuit switch (1) based on the input information.
6) Do not output a power supply request signal. Therefore, the second power supply circuit switch (16) is turned off and the DC power supply is connected to the coil (
2o) and (21) to the second transmission line (3).

However, since the first transmission line (2) is supplied with a positive DC power supply and the second transmission line (3) is supplied with a different negative DC power supply, the control circuit (18) is a cross switch. (19) Outputs an inversion control signal. The cross switch (19) has a manually inputted control signal that is an inverted control signal, so the Ml output (19a) is internally converted to the second output (19).
d) and the first output (19b) is connected to the second input (19c).

Depending on the state of the cross switch (19), a positive power source is supplied to the first input (11a) of the relay circuit (11), a negative power source is supplied to the first output (11b), and a negative power source is supplied to the first output (11b) of the relay circuit (11).
A negative power supply is supplied to the human power (11c), and the second output (
lld) is connected to a positive power supply.

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) The cross switch (
19).

Condition ■: Negative DC power is already being supplied to the (+) side of the first transmission line (2), and positive DC power is already being supplied to the (+) side of the second transmission line (3). If supplied, the first power polarity detection circuit (14) outputs information indicating that negative DC power is being supplied, and the second power polarity detection circuit (15)
outputs information indicating that a positive DC power source is being supplied to the control circuit (18).

The control circuit (18) does not output a power supply request signal to the first power supply circuit switch (17) because the information output from the first power supply polarity detection circuit (14) is information indicating that power is being supplied.

Therefore, the first power supply circuit switch (17) is turned off and no DC power is supplied to the first transmission line (2).

On the other hand, the second power supply polarity detection circuit (15) also outputs information indicating that power is being supplied to the control circuit (18) since the second transmission line (3) is already supplied with DC power, and the control circuit (15) outputs information indicating that power is supplied to the control circuit (18). 18
) is the second power supply circuit switch (
16) Do not output a power supply request signal. Therefore, the second power supply circuit switch (16) is turned off and no DC power is supplied to the second transmission line (3) via the coils (2o) and (21).

However, since a negative DC power source is supplied to the first transmission line (2) and a different positive DC power source is supplied to the second transmission line (3), the control circuit (18) is connected to the cross switch. The cross switch (19) outputs an inverted control signal to the cross switch (19) because the input control signal is an inverted control signal, so the first output (19a) is internally output to the second output (19).
d) and the first output (19b) is connected to the second input (19c).

Depending on the state of the cross switch (19), a negative power source is supplied to the first input (11a) of the relay circuit (11), a positive power source is supplied to the first output (llb), and a positive power source is supplied to the first output (llb) of the relay circuit (11).
A positive power supply is supplied to the input (11c) of the second output (11c), and the second output (
lld) is connected to a negative power supply.

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) The cross switch (
19).

Condition ■: Negative DC power is already being supplied to the (+) side of the first transmission line (2), and negative DC power is already being supplied to the (+) side of the second transmission line (3). If supplied, the first power polarity detection circuit (14) outputs information indicating that negative DC power is being supplied, and the second power polarity detection circuit (15)
also outputs information indicating that a negative DC power source is being supplied to the control circuit (18).

The control circuit (18) does not output a power supply request signal to the first power supply circuit switch (17) because the information output from the first power supply polarity detection circuit (14) is information indicating that power is being supplied.

Therefore, the first power supply circuit switch (17) is turned off and no DC power is supplied to the first transmission line (2).

In addition, since DC power is already being supplied to the second transmission line (3), the power supply polarity detection circuit (15) of the second option outputs information indicating that power is being supplied to the control circuit (18), and the control circuit (18)
is the second power supply circuit switch (1) based on the input information.
6) Do not output a power supply request signal. Therefore, the second power supply circuit switch (16) is turned off and the DC power supply is connected to the coil (
20) and (21) to the second transmission line (3).

Furthermore, the first transmission line (2) is supplied with negative DC power, and the second transmission line (3) is also supplied with the same negative DC power, so the control circuit (18) is switch (1
9) outputs a non-inverting control signal. Since the input control signal of the cross switch (19) is a non-inverting control signal, the first output (19g) is internally changed to the second output (19g).
c) and the first output (19b) is connected to the second output (19d).

Depending on the state of the cross switch (19), a negative power supply is supplied to the first input (11a) of the relay circuit (11), and a positive DC power supply is supplied to the first output (11b),
A negative DC power source is supplied to the second input (11C), and a positive DC power source is supplied to the second output (11d).

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) The cross switch (
19) will be carried out.

As described above, according to the first embodiment, even if the polarities of the DC power supplies feeding the first transmission line and the second transmission line are different, the difference in the power supply status of the power supplies is automatically detected, and even if the polarities of the DC power supplies that are supplied to the first transmission line and the second transmission line are different, the difference in the power supply status is automatically detected. Therefore, the transmission signal input from one transmission line can be adjusted and output to the other transmission line for transmission.

Description of Second Embodiment: FIG. 3 shows a functional block diagram of a second embodiment of the relay device (1) according to the present invention. FIG. 4 shows the operation of the main parts of the relay device shown in FIG. 3.

Device configuration description: The relay device (1) of the first embodiment of the present invention includes a relay circuit (11), a first polarity detection circuit (14), a second power supply polarity detection circuit (15), Third power supply circuit switch (
24) and a control circuit (18).

The third power supply circuit switch (24) includes a DC power supply.

Device characteristics and connection relationship description: The (+) side of the first transmission line (2) is the first input (lla) of the relay circuit (1]) and the first power supply polarity detection circuit (14).
is connected to the input (14a) of the relay circuit (14a), and the (-) side is connected to the relay circuit (14a).
1) and the first output (14b) of the first power supply polarity detection circuit (14), and the (+) side of the second transmission line (3) is connected to the relay circuit ( 11) of the second human power (11c) and the input of the second power supply polarity detection circuit (15) (
15a) and the first input (24a) of the third power supply circuit switch (24) via the coil 20, and the (-) side of the second transmission line (3) is connected to the first input (24a) of the relay circuit (11). 2 output (11d), the first output (15b) of the second power supply polarity detection circuit (15), and the input (24b) of the third power supply circuit switch (24) via the coil (21). , 1st
The second output (14c) of the power supply polarity detection circuit (14) is connected to the first input (18a) of the control circuit (18),
The second output (15c) of the second power supply polarity detection circuit (15)
) is connected to the second input (18c) of the control circuit (18), and the output (18b) of the control circuit (18) is connected to the second input (24c) of the third power supply circuit switch (24). Ru.

Device operation description: In the relay device (1) of the second embodiment, the first or second
A positive or negative DC power source is supplied in advance to the transmission line (2) or (3) of The relay circuit (11) is supplied by adapting to the difference in state.

FIG. 4 shows the operating state of the relay device according to the second embodiment.

The operation for each state will be explained below.

Condition ■: When a positive DC power source is initially supplied to the first transmission line (2) and no DC power is supplied to the second transmission line (3), the first power supply polarity detection circuit ( 14) determines that a positive DC power source is being supplied and outputs information indicating that positive power is being supplied to the control circuit (18).

On the other hand, the second power supply polarity detection circuit (15) determines that power is not being supplied to the second transmission line (3), and the control circuit (18) determines that power is not being supplied to the second transmission line (3).
) outputs a signal indicating that power is not being supplied.

The control circuit (18) outputs a power supply request signal to the third power supply circuit switch (24) based on the input signal. Third
The power supply circuit switch (24) switches to O based on the power supply request signal.
N and supplies DC power to the second transmission line (3) via the coils (20) and (21). At this time, the polarity of the DC power supply is not inverted and the second input (
11c) is supplied with positive DC power, and the second output (1
1d) is supplied with negative DC power. Because the first
from the transmission line (2) to the first input (1) of the relay circuit (11).
This is because positive DC power is supplied to 1a), and negative power is supplied to the first output (11b).

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) Normal transmission of packet signals is performed by competing with each other.

Condition ■: When the first transmission line (2) is initially supplied with positive DC power and the second transmission line (3) is supplied with positive DC power, the first power supply polarity detection The circuit (14) determines that a positive DC power source is being supplied, and outputs information indicating that positive power is being supplied to the control circuit (18).

On the other hand, the second power supply polarity detection circuit (15) also determines that a positive DC power supply is being supplied to the second transmission line (3) and detects that positive power is being supplied to the control circuit (18). Outputs the signal that represents.

The control circuit (18) does not output a new power supply request signal to the third power supply circuit switch (24) because the power supply state is the same for both transmission lines.

In this case, the first transmission line (
Since the polarities of the power supplies of 2) and the second transmission line (3) are the same, for example, when the AMI signal is input to the first transmission line (2), it is input to the relay circuit (11) and is transmitted here. Adjustments such as level correction and waveform shaping are made in the second transmission line (3).
is output and transmitted.

Condition ■: If the first transmission line (2) is initially supplied with a positive DC power supply, and the second transmission line (3) is supplied with a negative DC power supply, the first power supply polarity The detection circuit (14) determines that a positive DC power source is being supplied, and outputs information indicating that positive power is being supplied to the control circuit (18).

On the other hand, the second power supply polarity detection circuit (15) determines that a negative DC power supply is being supplied to the second transmission line (3), and indicates that negative power is being supplied to the control circuit (18). Output a signal.

However, since the power supply state of the first transmission line (2) and the power supply state of the second transmission line (3) are different, the control circuit (18) switches the third power supply circuit switch ( 2
4) It is not possible to output a control signal that inverts the polarity.

Therefore, under such conditions, I! in the second embodiment! It is not appropriate to operate the device.

Condition ■: When the first transmission line (2) is initially supplied with negative DC power and the second transmission line (3) is not supplied with power, the first
The power supply polarity detection circuit (14) determines that a negative DC power supply is being supplied, and outputs information indicating that negative power is being supplied to the control circuit (18).

On the other hand, the second power supply polarity detection circuit (15) determines that power is not being supplied to the second transmission line (3), and the control circuit (18) determines that power is not being supplied to the second transmission line (3).
) outputs a signal indicating that power is not being supplied.

Since the power supply state of the first transmission line (2) and the power supply state of the second transmission line (3) are different based on the input signal, the control circuit (18) adjusts the power supply state of the third transmission line to match the first power supply state. A power supply request signal is output to the power supply circuit switch (24). Third
The power supply circuit switch (20) switches to O based on the power supply request signal.
N and supplies DC power to the second transmission line (2) via the coils (20) and (21). At this time, the polarity of the DC power supply is reversed and the second input (1
1c) is supplied with negative DC power, and the second output (ll
d) is supplied with a positive DC power supply.

This is because negative DC power is supplied from the first transmission line (2) to the first input (11a) of the relay circuit (11), and positive DC power is supplied to the first output (1l b). This is because power is being supplied.

With the above operation, the first relay circuit (11) is
The polarities of the power supplies of the transmission line (2) and the second transmission line (3) match, so even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) Normal transmission of packet signals is performed by competing with each other.

Condition ■: When the first transmission line (2) is initially supplied with negative DC power and the second transmission line (3) is supplied with positive DC power, the first power supply polarity detection The circuit (14) determines that a negative DC power source is being supplied, and outputs information indicating that negative power is being supplied to the control circuit (18).

On the other hand, the second power supply polarity detection circuit (15) determines that the positive DC power is being supplied to the second transmission line (3) and detects that the control circuit (18) is being supplied with positive power. Outputs the signal that represents.

However, since the power supply state of the first transmission line (2) and the power supply state of the second transmission line (3) are different, the control circuit (18) switches the third power supply circuit switch ( 2
4) It is not possible to output a control signal that inverts the polarity.

Therefore, under such conditions, it is not appropriate to operate the relay device of the second embodiment.

Condition ■: When the first transmission line (2) is initially supplied with a negative DC power supply and the second transmission line (3) is also supplied with a negative DC power supply, the first power supply polarity detection The circuit (14) determines that a negative DC power source is being supplied, and outputs information indicating that negative power is being supplied to the control circuit (18).

In addition, the power supply polarity detection circuit (15) of the power tube 2 determines that a negative DC power is being supplied to the second transmission line (3), and the control circuit (18) is being supplied with negative power. Outputs a signal representing .

Since the power supply state of the first transmission line (2) and the power supply state of the second transmission line (3) match based on the input signal, the control circuit (18) switches the third power supply circuit switch (24) again. Does not output power supply request signal.

In this case, the first transmission line (
Since the polarities of the power supplies of 2) and the second transmission line (3) are the same, even if packet signals transmitted from multiple terminals between the transmission lines collide, the relay circuit (11) prevents the conflict from occurring. Normal packet signal transmission occurs.

Condition ■: If the first transmission line (2) and the second transmission line (3) are not supplied with DC power, this second embodiment is not appropriate.

Condition ■: Also, if the first transmission line (2) is not supplied with DC power and the second transmission line (3) is not supplied with positive or negative DC power, this second Example is not suitable.

As described above, according to the second embodiment, although the usable conditions are more limited than in the first embodiment, it can be realized with a simple circuit configuration.

[Effects of the Invention] According to the present invention, even if the polarities of the DC power supplies feeding the first transmission line and the second transmission line are different, the difference in the power supply state of the power supplies is automatically detected, Furthermore, since it can be adapted to match, even if packet signals transmitted from a plurality of terminals collide, it is possible to compete in the relay circuit and transmit the packet signals normally.

Therefore, by adding the relay device of the present invention between different existing transmission lines, it becomes possible to expand the transmission line network more than ever before.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of a first embodiment of the relay device of the present invention, FIG. 2 is a diagram showing the operation of the main parts of the relay device of FIG. 1, and FIG. FIG. 4 is a diagram showing the operation of the main parts of the relay device in FIG. 3, FIG. 5 is an interface diagram of the conventional relay device, and FIG. 6 is a conventional control data transmission diagram. It is a figure showing a format. In the figure, (1) is a relay device, (2) is a first transmission path, (3) is a second transmission path, (11) is a relay circuit, and (12) is a relay device.
) is the first power supply circuit, (13) is the second power supply circuit, (1
4) is the first power supply polarity detection circuit, (15) is the second power supply polarity detection circuit, (16) is the second power supply circuit switch, (
17) is the first power supply circuit switch, (18) is the control circuit, (19) is the cross switch, (20), (21)
. (22) and (23) are coils, and (24) is a third power supply circuit switch. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a relay device that includes a relay circuit that adjusts and outputs an input signal and is connected between a first transmission path and a second transmission path, the power supply polarity of the first transmission path is detected and a control signal is sent. a first power supply polarity detection circuit that outputs a power supply polarity of the second transmission line; a second power supply polarity detection circuit that detects the power supply polarity of the second transmission line and outputs a control signal; a first power supply circuit switch that controls whether or not to supply power; a second power supply circuit switch that controls whether or not to supply power to the second transmission path based on an input control signal; a cross switch that controls inverting or non-inverting the power supply polarity of one of the input signals of the first or second transmission line based on a control signal to be output to the relay circuit; and an output of the first power supply polarity detection circuit. A relay characterized in that it includes a control circuit that outputs a control signal to the first power supply circuit switch, the second power supply circuit switch, and the cross switch based on the control signal and the output control signal of the second power supply polarity detection circuit. Device. (2) In a relay device that includes a relay circuit that adjusts and outputs an input signal and is connected between a first transmission path and a second transmission path, the power supply polarity of the first transmission path is detected and a control signal is sent. a first power supply polarity detection circuit that outputs a power supply polarity of a second transmission line; a second power supply polarity detection circuit that detects a power supply polarity of a second transmission line and outputs a control signal; a third power supply circuit switch that supplies one of the second transmission paths with the power supply polarity inverted or non-inverted; and an output control signal of the first power supply polarity detection circuit and the second power supply polarity. A relay device comprising: a control circuit that outputs a control signal to a third power supply circuit switch based on an output control signal of the detection circuit.