JPH05136772A - Unit function changeover system - Google Patents

Abstract

PURPOSE:To provide the unit function changeover system featured by using one transmission line so as to select signals of plural circuits sequentially over two units in the communication equipment such as a subscriber system transmitter or the like. CONSTITUTION:The subject system is provided with a control means 1 controlling switches so that a changeover means SWx of a circuit (x) is closed corresponding to an external control signal designating the circuit (x) for signal transmission and other changeover means are all opened, a transmission line 20 sending a signal in 2-way, 1st-N-th circuit transmission sections SND1-SNDn, changeover means SW1-SWn switching outputs of the transmission sections SND1-SNDn of each circuit and reception sections REC1-RECn of the 1st-Nth circuits, and a signal of a transmission section SNDx of the circuit (x) is sent to the reception section RECx of the opposite circuit (x) corresponding to an external control signal designating the circuit (x) sending a signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to bidirectional transmission of a plurality of signals through one transmission line in a communication device such as a subscriber transmission device.

[0002] In subscriber system transmission equipment, various changes are required to be carried out in a short time by remodeling the unit without operating the system down or in the operating state as it is. It has become. For this reason, it may be unavoidable to share a transmission line prepared for a certain specific signal transmission in the device, and the transmission line for the specific signal transmission may be used for various signals without trouble. There has been a demand for a system that enables shared transmission in all directions.

[0003]

2. Description of the Related Art In a conventional communication device such as a subscriber's transmission device, the unit used is often constructed so that one unit has one function, and the transmission line within the device is also specified. Is generally prepared for the purpose of being used to transmit the signal of unidirectionally.

In addition, in order to add a new service or modify for improving quality while operating these devices,
It is normal to temporarily suspend operations and take necessary measures.

[0005]

However, in recent years, with respect to these devices, the system has not been downgraded for the purpose of improving the functions such as the monitoring function and the communication quality improvement after the start of operation, and the system remains in the operating state, or There are now many cases where the equipment side has to be changed in a short period of time during a traffic outage at night without modifying the equipment. In order to meet this demand, it is unavoidable to use the transmission path prepared for one-way transmission for two-way transmission, without changing the device side, for various added control functions. There is a need to change to bi-directional transmission without trouble.

An object of the present invention is to solve such a problem, and an object thereof is to provide a unit function switching system which is characterized in that signals of a plurality of circuits are used in one transmission path and are sequentially switched and transmitted. To do.

[0007]

FIG. 1 is a block diagram showing the principle of a unit function switching system according to the present invention. In the figure, 1 is a control means, 20 is a transmission line, SEND1 to SENDn are transmission parts of circuits 1 to n, and REC1 to RECn are circuits 1 to n.
Each of the receiving units, SW1 to SWn is a switching unit of each of the circuits 1 to n.

According to the present invention, a control means 1 for transmitting a switching command signal corresponding to a received control signal, a transmission line 20 for bidirectionally transmitting a signal, and circuits 1 to N for transmitting a predetermined signal.
Of each transmission section SND1 to SNDn, each reception section REC1 to RECn of each circuit 1 to N for receiving a predetermined signal, and switching means SW of each circuit 1 to N controlled by the control means 1.
1 to SWn.

Upon receiving the switching command signal for the circuit 1 from the control means 1, the switching means SW1 of the circuit 1 shorts the switch, and the other switching means SW2 to SWn open the switch to transmit the circuit 1. The signal of the unit SND1 is transmitted to the receiving unit REC1 of the circuit 1 through the transmission line 20.

Similarly, any switching means SWx which receives the switching command signal from the control means 1 short-circuits the switch, and the other switching means SW1 to SWn open the switches, so that the transmitting section SNDx of the circuit x is opened. Signal to the transmission line 2
The object can be achieved by transmitting to the receiving part RECx of the circuit x via 0.

[0011]

In the present invention, the switching signal corresponding to the control signal input by the control means 1 which receives the control signal sent from the device such as the remote terminal is sent to the corresponding switching means.

Only the switching means SWx receiving the switching signal is closed to connect the output of the transmission unit SNDx of the corresponding circuit x to the input of the reception unit RECx of the corresponding circuit x via the transmission line 20 to transmit the circuit x. The signal of the first circuit SND1 is transmitted from the unit SNDx to the receiving unit RECx of the circuit x.
Since the switches of the switching means of the circuits that do not receive all other switching signals are in the open state, the transmitting section of the circuits that do not receive the switching signal is not connected to the receiving section, so that no signal is transmitted.

The receiving unit of each circuit must have a function of receiving only the signal of the transmitting unit of the corresponding circuit and not receiving the signal of the transmitting unit of the non-corresponding circuit.

[0014]

[Embodiment] Next, an embodiment will be described with reference to FIGS.
Will be explained. FIG. 2 shows an embodiment of the unit function switching system according to the present invention, and shows an example in the case of two sets of circuits, circuit 1 and circuit 2.

In the figure, the same reference numerals as those in FIG.
In the control means 1 in FIG. 1, 10 is a control unit that receives a control signal and generates a signal for transmitting a switching command signal, 11 is a CPU of the control unit 10, and 30 is a transmission unit SND1 of the circuit 1 and a circuit. The units A and 31 equipped with the related circuit of the second receiving unit REC2 are C of the unit A30.
PU and SW1 are concrete examples of the switching means SW1 in FIG.
BUF2, a three-state buffer that makes the output high impedance or releases the high impedance to low impedance by the switching signal of U31.
Is a buffer and R1 is a resistance. Also, 40 is the circuit 1
The unit B and 41 including the related circuits of the receiving unit REC1 of the above and the transmitting unit SND2 of the circuit 2 are CPs of the unit B40.
U and SW2 are concrete examples of the switching means SW2 in FIG.
A three-state buffer, BUF1, is a buffer that outputs high impedance or releases high impedance to low impedance by the switching signal of 41.

As an example of the transmission signal to be used, the circuit 1 is composed of, for example, a parallel signal circuit, and the circuit 2 is composed of, for example, a serial signal circuit. One transmission path is used, and the parallel signal and the serial signal are alternately arranged. Transmit signal.

FIG. 3 is an example of a function confirmation processing sequence for signal transmission of the circuit 1 in FIG. 2, which is shown by symbols of 1 to 4 in the order of processing. Further, FIG. 4 shows the signal transmission of the circuit 1 in FIG. It is an example of a function switching processing sequence to the signal transmission of, and is indicated by the symbols * 1 to * 6 in the processing order.

In FIG. 2, ~ and * 1- * in the figure
Reference numeral 6 is added to correspond to the processing in FIGS. 3 and 4, and will be described below in order of processing. First, the power of each unit of each device is turned on, and the unit A30 and the unit B40 are in the indeterminate state but in the standby state. ． A control signal for transmitting the signal of the circuit 1 is sent from a remote terminal or the like (not shown) to the control unit 10. ． The CPU 11 of the control unit 10 is the unit A30.
A switching control signal for transmitting the signal of the circuit 1 corresponding to the received control signal is sent to the unit B40. ． In the unit A30 that has received the switching control signal for signal transmission of the circuit 1, in response to the switching control signal received by the CPU 31, a switching confirmation indicating that the unit A30 is in a normal and standby state and can operate or switch Is returned to the control unit 10.

On the other hand, also in the unit B40, the CPU
Reference numeral 41 returns a switching confirmation response signal to the control unit 10, which indicates that the unit B 40 is in a normal and standby state and can be operated or switched. ． The control unit 10 is a unit A30 and a unit B.
From 40, it is confirmed that the switch confirmation response signal is received and that the system is operating normally. ． After the confirmation by the control unit 10, the unit A
A switching control signal for starting operation of signal transmission of the circuit 1 is sent to the unit 30 and the unit B40. ． In the unit A30 that receives the switching control signal, the CP
The switching signal "0" corresponding to the switching control signal for starting the operation of the signal transmission of the circuit 1 received by the U31 is sent to the transmitting unit SN of the circuit 1.
It is sent to the three-state buffer SW1 at the output of D1, and the output impedance is set to low impedance,
It enables the signal of the circuit 1 to be output.

On the other hand, in the unit B40, the CPU
41 sends a switching signal "1" to the three-state buffer SW2 at the output of the transmission unit SND2 of the circuit 2 to make the output impedance of the three-state buffer SW2 high impedance so that the signal of the circuit 2 is not output.

By these operations, the signal transmission of the circuit 1 enters the operating state, and the reception unit REC1 of the circuit 1 is transmitted from the transmission unit SND1 of the circuit 1 of the unit A30 through the transmission line 20 until the next switching control signal is received. The signal of the circuit 1 is transmitted to.

Next, the signal transmission of the circuit 1 is completed, and the circuit 2
The transmission of the signal will be described. * 1. Circuit 2 from the remote terminal to the control unit 10
The control signal for signal transmission is transmitted. * 2. The CPU 11 of the control unit 10 is the unit A3
0 and the unit B40, a switching control signal for signal transmission of the circuit 2 is transmitted corresponding to the control signal. * 3. In response to the switching control signal, the CPU 31 of the unit A30 returns to the control unit 10 a switching confirmation response signal indicating that the unit A30 is in the normal and standby state and can be switched.

On the other hand, also in the unit B40, the CPU
45 returns to the control unit 10 a switching confirmation response signal indicating that the unit B 40 is in a normal standby state and can be switched. * 4. The control unit 10 receives the response signals from the unit A30 and the unit B40 and confirms that the operation of the system is operating normally. * 5. When the control unit 10 finishes checking the units A30 and B40, it sends a switching control signal for starting operation of signal transmission of the circuit 2 to the units A30 and B40. * 6. In the unit A30 that receives the switching control signal from the control unit 10, the CPU 31 sends the switching signal "1" corresponding to the switching control signal, and the output impedance of the three-state buffer SW1 of the circuit 1 is low impedance. Is returned to high impedance so that the signal of the circuit 1 cannot be output.

On the other hand, in the unit B40, the CPU
41 outputs a switching signal "0" to release the output impedance of the three-state buffer SW2 of the circuit 2 from the high impedance to the low impedance so that the signal of the circuit 2 can be output.

With the above operation, the unit A30 and the unit B are
40 enters the operating state of signal transmission of the circuit 2 until the next switching control signal is received, from the transmission unit SND2 of the circuit 2 of the unit B40 to the reception unit REC of the circuit 2 of the unit A30.
The signal of the circuit 1 is transmitted to the transmission line 2 via the transmission line 20.

The above is an example of two sets of circuits, but the same applies to the case of three or more sets. The switching signal "0" is sent to the three-state buffer of the circuit for signal transmission, and the three circuits of other circuits are sent. By sending the switching signal "1" to the state buffer, only the signal of the target circuit can be transmitted.

[0027]

As described above, according to the present invention,
It is possible to send and receive signals of multiple circuits configured between two units while switching using a common transmission path, and transmitting multiple types of signals of different types in the same direction and in the opposite direction. Is possible and has the advantage that it can be used in a wide range.

Further, by using the present invention for an important line such as a public communication facility, it is possible to upgrade the system of the supervisory control line such as the modification of the supervisory system without interrupting the operation of the line. Can be prevented. Further, there is also an effect that the operation line maintenance staff does not need any additional work before the modification such as approval of the line temporary stop for the line users.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of a unit function switching system according to the present invention.

FIG. 2 is a diagram showing an embodiment of a unit function switching system according to the present invention.

3 is a diagram showing an example of a function confirmation processing sequence for signal transmission of the circuit 1 in FIG.

4 is a diagram showing an example of a function switching processing sequence from signal transmission of the circuit 1 to signal transmission of the circuit 2 in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 control means 10 control unit 11,31,41 CPU 20 transmission line 30 unit A 40 unit B SND1 ~ x ~ n transmission part of each circuit 1 ~ x ~ n REC1 ~ x ~ n reception of each circuit 1 ~ x ~ n Part SW1 to x to n Switching means for each circuit 1 to x to n, Threetate buffers BUF1 and BUF2 buffers R1 to each circuit 1 to x to n

Claims (1)

[Claims] 1. A control means (1) for transmitting a switching command signal corresponding to a control signal to be received, a transmission path (20) for bidirectionally transmitting a signal, and circuits 1-N for transmitting a predetermined signal. Each transmitter (SND1
~ SNDn) and each receiving unit (REC1) of the circuits 1 to N for receiving a predetermined signal.
To RECn) and switching means (SW1 to SWn) for each of the circuits 1 to N controlled by the control means (1), and receiving the switching command signal for the circuit 1 from the control means (1). The switching means (SW1) of the circuit 1 shorts the switch, the other switching means (SW2 to SWn) open the switch, and the signal of the transmission unit (SND1) of the circuit 1 is transmitted through the transmission path (20). To the receiving section (REC1) of the circuit 1, and similarly, any switching means (SWx) receiving the switching command signal from the control means (1) short-circuits the switch, and all the other switching operations. Means (SW1 other than SWx
SWn) opens a switch and transmits the signal of the transmission unit (SNDx) of the circuit x to the reception unit (RECx) of the circuit x via the transmission path (20). ..