JP2005051750A - Method for automatically correcting erroneous connection of transmission/reception path, and transmission apparatus and transmission system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for automatically correcting erroneous connection, transmission apparatus and a transmission system in which a connection error of a transmission/reception cable is absorbed within the transmission apparatus to reduce faults caused by line construction errors. <P>SOLUTION: A CPU 8 monitors a signal detecting state 9 and a synchronizing state 10 of a line and fixes the state of a switch 4 from an initial state to a switching state to automatically turn both the signal detection and the synchronization into normal states. Thus, the connection error of the transmission/reception cable is absorbed within the transmission apparatus to reduce faults caused by line construction errors. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for automatically correcting an erroneous connection of a transmission / reception transmission line connector in a transmission / reception transmission unit having transmission and reception functions, a transmission apparatus using the method, and a transmission system.

When installing transmission equipment for network construction, if the transmission side cable and the receiving side cable of the communication line are mistakenly constructed, there is a problem that the installed transmission equipment is not synchronized with the network side and communication is not possible. . One method for automatically correcting the erroneous connection of the input / output cable is disclosed in the public gazette in the case where the input / output cable is an optical fiber (see, for example, Patent Document 1).
FIG. 8 shows the configuration. The optical transmission device A and the optical transmission device B facing each other through the upstream and downstream optical transmission lines have an optical transmitter E / O and an optical receiver O / E, and a connector for connecting an optical fiber as a transmission path to the device. An optical switch is interposed between the two. The control circuit monitors the output electrical signal of the optical receiver O / E, and detects that this output electrical signal is non-output if the connection to the upstream / downstream optical transmission line is incorrect. Control is performed to switch the 2 × 2 optical switch from the through (or bar) initial state to the cross state to automatically correct misconnection.

JP 63-227226 A (page 3-5, FIG. 1)

The conventional method for automatically correcting erroneous connection of the input side / output side cable to the transmission apparatus shown above switches the connection by monitoring the level of the transmitted signal. When the signal transmission speed is low and between the opposing devices, automatic correction functions only by monitoring the signal level. However, the transmission speed becomes a high bit rate, and particularly in the case of a synchronous network in which the entire network is large and the entire network communicates synchronously, level monitoring alone is insufficient.
The present invention has been made in view of the above problems, and the object of the present invention is to absorb transmission / reception cable connection errors in the transmission apparatus and reduce failures due to line construction errors. An object of the present invention is to provide an automatic erroneous connection correction method, a transmission apparatus, and a transmission system.

In order to solve the above-mentioned problems, the transmission / reception cable misconnection automatic correction method according to the present invention includes a transmission cable for transmitting and receiving a transmission signal and a reception cable via a 2-input 2-output switch, In a transmission device connected to either the transmission means or the reception means according to the switching state of the switch, when the reception level state of the reception means is below a predetermined level or the synchronization of the received signal is not established The switching of the switch is reversed from the initial state.
Further, according to the transmission / reception cable automatic connection correction method of the present invention, the transmission cable and the reception cable for transmitting / receiving transmission signals are connected via a switch with two inputs and two outputs and according to the switching state of the switch with two inputs and two outputs. In the transmission device connected to either the transmission means or the reception means, the reception level state of the reception means and the synchronization state of the reception signal are detected, and the reception level state of the reception means is below a predetermined level or the synchronization of the reception signal. When the signal is not established, the switch switching is reversed from the initial state, and after a predetermined time has elapsed, the reception level state of the reception means and the synchronization state of the reception signal are detected again, and the reception level state of the reception means again. When the signal is below a predetermined level or the received signal is not synchronized, the switch is reversed again to return to the initial state, and a connection failure is notified. Issues a broadcast transmission apparatus is characterized in that in the standby state.
Moreover, you may perform periodically the incorrect connection automatic correction method of said transmission / reception cable.
Further, according to the transmission / reception cable automatic connection correction method of the present invention, the transmission cable and the reception cable for transmitting / receiving transmission signals are connected via a switch with two inputs and two outputs and according to the switching state of the switch with two inputs and two outputs. In the transmission apparatus respectively connected to either the transmission means or the reception means, the step of setting the switch switching state to the initial state, the step of detecting the reception level state of the reception means, and the synchronization of the reception signal of the reception means A step of detecting the state; and a step of inverting the switching of the switch when the reception level state of the receiving means is below a predetermined level or the synchronization of the reception signal is not established.
Further, according to the transmission / reception cable automatic connection correction method of the present invention, the transmission cable and the reception cable for transmitting / receiving transmission signals are connected via a switch with two inputs and two outputs and according to the switching state of the switch with two inputs and two outputs. In the transmission apparatus respectively connected to either the transmission means or the reception means, the step of setting the switch switching state to the initial state, the step of detecting the reception level state of the reception means, and the synchronization of the reception signal of the reception means A step of detecting a state, a step of inverting the switching of the switch when the reception level state of the receiving means is below a predetermined level or the synchronization of the reception signal is not established, and reception again after a predetermined time has elapsed. Detecting the reception level state of the means and the synchronization state of the received signal; and again, the reception level state of the reception means is below a predetermined level or received. Reversing switch switching back to the initial state when signal synchronization is unestablished, and issuing a warning notifying the connection failure and placing the transmission device in a standby state. Features.
Further, the method may include a step of periodically performing the above-described automatic connection error correction method for a transmission / reception cable.

In the transmission apparatus of the present invention, the transmission cable and the reception cable for transmitting and receiving transmission signals are passed through a 2-input 2-output switch, and depending on the switching state of the 2-input 2-output switch, the transmission means or the reception means When the receiving level state of the receiving means is below a predetermined level or the synchronization of the received signal is not established, the switching of the switch is reversed and the transmission / reception cable is connected. Means is provided for automatically correcting erroneous connections.
In the transmission apparatus of the present invention, the transmission cable and the reception cable for transmitting and receiving transmission signals are passed through a 2-input 2-output switch, and depending on the switching state of the 2-input 2-output switch, the transmission means or the reception means Each of which is connected to one of the two, and a transmission device having a control unit for controlling a two-input two-output switch and a transmission / reception unit, wherein the control unit detects a reception level state of the reception unit and a synchronization state of the reception signal. When the reception level state of the reception means is below a predetermined level or the synchronization of the reception signal is not established, the switching of the switch is reversed, and after the predetermined time has elapsed, the reception level state of the reception means and the reception are received again. When the signal synchronization state is detected, the switching of the switch is reversed again when the reception level state of the receiving means is again below the predetermined level or the synchronization of the reception signal is not established. Back to the initial state Te, an alarm for notifying the connection failure, and performs a control to the standby state of the above transmission device.
The control means may periodically perform control performed by the control means.
The receiving means may include a detector, a means for identifying and outputting the photoelectric conversion signal of the detector, and a means for detecting the level of the photoelectric conversion signal and outputting a signal level state.
The receiving means may include means for detecting whether synchronization of the code-identified signal is established or not established and outputting information on the signal synchronization state.
The reception means, the transmission means, and the 2-input 2-output switch may be integrated in a hybrid or monolithic manner.
The transmission system of the present invention is characterized by connecting a plurality of the above-described transmission devices.

  In the transmission apparatus for transmitting / receiving a transmission signal, when the reception level state of the reception means is below a predetermined level or the synchronization of the reception signal is not established, the transmission cable and the reception cable are automatically switched. By doing so, it is possible to reduce troubles due to mistakes in circuit construction.

  Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an optical transmission apparatus which is a first embodiment of a transmission apparatus of the present invention. FIG. 1A shows a case where transmission / reception optical fibers are correctly connected, and FIG. 1B shows a case where a transmission optical fiber and a reception optical fiber are mistakenly connected.
The optical transmission device 1 includes an optical fiber connector receiving connector 2, two 1 × 2 optical switches 4, a coupler 5 for joining / branching light, an optical module 6, a framer 7, and a CPU 8. Composed.
Referring to FIG. 1A, the signal path on the reception side will be described. Signal light from the reception optical fiber 3-1 connected to the reception optical connector 2-1 passes through the optical switch 4 and the coupler 5-1. The light is transmitted and input to the receiving unit of the optical module 6. The optical module 6 performs photoelectric conversion on the received optical signal, code-identifies the received signal converted into electricity, sends the received signal to the framer 7, and sends the received signal detection state information to the CPU 8. The framer 7 separates data from the received signal and sends information on the synchronization state of the received signal to the CPU 8.
Next, on the signal path on the transmission side, the transmission data from the data input / output 12 is added to the overhead by the framer 7 and assembled into a transmission frame structure, converted into electric light in the optical module 6, optical switch 4, transmission optical connector 2. -2 to the transmission optical fiber 3-2.
Now, as shown in FIG. 1B, the reception optical fiber 3-1 is connected to the transmission optical connector 2-2, and the transmission optical fiber 3-2 is connected to the reception optical connector 2-1. Suppose that incorrect connection work has been performed. The CPU 8 monitors the signal detection state 9 and the synchronization state 10 of the optical line, and fixes the state of the optical switch 5 from the initial state to the switching state so that both signal detection and synchronization are automatically normal. Thus, the optical signal from the reception optical fiber 3-1 is correctly connected to the reception unit of the optical module, and the transmission optical signal from the optical module transmission unit is correctly connected to the transmission optical fiber 3-2.

The feature of the present invention is not to switch the connection only by signal detection but to switch the optical switch so that the synchronization state is monitored and the synchronization is in a normal state as well as the signal detection. Even if optical input is detected, synchronization instability such as loss of synchronization or synchronization slip is considered to occur in the following cases.
For example, when optical fiber connector connection work is performed, if the signal level reaching the optical module receiver is low due to attenuation due to poor connection, the signal S / N is bad, the line jitter is large, or the opposite station There are cases where a certain transmitting station does not transmit a prescribed synchronization pattern. Therefore, regarding the configuration of the optical transmission apparatus of the present invention that enables monitoring of the synchronization state, the configurations of the optical module 6 and the framer 7 will be described in detail with reference to FIG. Here, a case where the optical transmission signal has a signal format in which an ATM signal is multiplexed on a payload in a synchronous transfer mode (SONET / SDH) will be described. However, it goes without saying that the signal format is not limited to this format.

The circuit on the receiving side of the optical module 6 includes a light receiver 61 that photoelectrically converts an optical signal input, a preamplifier 62, a variable gain amplifier 63, a PLL circuit or clock extraction circuit 65, an identification circuit 64, and a peak detection. A circuit 66 is provided.
The preamplifier 62 converts the photoelectric conversion output signal of the light receiver 61 from current to voltage. The PLL circuit or clock extraction circuit 65 extracts a clock from the output of the variable gain amplifier 63. The identification circuit 64 identifies a signal based on the extracted clock. The peak detection circuit 66 detects the presence and level of an optical signal. The CPU 8 reads the signal detection state 9 from the output of the peak detection circuit 66.
The framer 7 includes a frame synchronization / recovery circuit 71, a monitoring register 73, an ATM layer interface 72, a controller interface 74, and a frame generation circuit 75.
The synchronization / recovery circuit 71 monitors the synchronization pattern included in the overhead in the SONET / SDH frame from the output signal of the identification circuit 64 in the optical module 6. The monitoring register 73 stores synchronization state information output from the frame synchronization / recovery circuit 71. The ATM layer interface 72 outputs an ATM signal separated from the payload of the SONET / SDH frame by the frame synchronization / recovery circuit 71. The controller interface 74 controls the interface between the CPU 8 and the framer. The frame generation circuit 75 multiplexes an ATM signal input from the outside of the optical transmission device 1 via the ATM layer interface into a SONET / SDH frame.
The CPU 8 reads the synchronization state 10 of the monitoring register via the controller interface 74. The CPU 8 sends out the optical switch control 11 when it becomes necessary to control the switching state of the optical switch 4 from the signal detection state 9 and the synchronization state 10.
The transmission signal is transmitted to the optical module 6 after the ATM signal is multiplexed into the SONET / SDH frame by the frame generation circuit 75.

The operation of automatic connection correction according to this embodiment will be described with reference to the flowchart of FIG. This operation detects optical fiber misconnection based on monitoring of the optical signal detection state and monitoring of the synchronization state of the optical signal, and automatically corrects the connection by the optical switch.
When the optical transmission device is activated after the optical fiber is connected, the CPU sets the optical switch to an initial state (S1). Next, the CPU reads the optical signal detection state of the optical module (S2). When it is detected that the optical signal is higher than a predetermined level (S3), the CPU reads the synchronization state from the framer monitoring register (S4). If the synchronization is established, the connection state of the optical switch is not changed (S5).
If an optical signal is not detected in step 3, or if synchronization is not established in step 5 and is unstable, the CPU instructs switching of the optical switch (S6). Next, the CPU reads the optical signal detection state of the optical module (S7). When the optical signal is detected, the CPU reads the synchronization state from the framer monitoring register (S8). If the optical signal is detected and synchronization is established, the connection state of the optical switch is not changed (S9).
If the optical signal is not detected in step 7, or if synchronization is not established in step 9 and is unstable, the CPU issues an alarm and takes a standby state (S10). Then, the CPU periodically returns to the flow of reading the optical signal detection state and the synchronization state from the optical transmission device so that the disconnection failure or the transmission station failure can be distinguished from the connection construction error (S2). If the signal detection and synchronization state continues many times and the process returns to the state of step 10 where the alarm is issued, it is detected that the failure is not a connection construction error but a line disconnection failure or a transmission station failure.
According to this embodiment, since the optical fiber erroneous connection is detected based on the monitoring of the optical signal detection state and the monitoring of the optical signal synchronization state, the connection can be surely automatically corrected by the optical switch.

The optical switch used in the optical transmission apparatus of the embodiment of FIG. 1 is composed of two 1 × 2 optical switches and two couplers 5. When viewed from both ends of the connector 2 side terminal of the optical switch 4 and the terminal of the coupler 5 on the optical module 6 side, these constitute a 2 × 2 optical switch. Accordingly, various types of optical switches can be used without being limited to the above-described two 1 × 2 optical switches and the two couplers 5.
For example, one method is to switch the optical path between straight and 90-degree reflection by mechanically inserting and removing a 90-degree reflecting mirror at the intersection where the fiber light is converted into parallel light beams and two light beams are crossed at right angles. There is also a method in which two 90-degree prisms joined with inclined surfaces are arranged at the intersection of light beams, and the refractive index of the joining layer is electrically changed to switch the optical path between straight and 90-degree reflection.
In addition, ultra-compact mechanically driven optical switches based on micromachine technology, as well as waveguide directional coupler optical switches using electro-optic and thermo-optic effects, and branching using the electro-optical absorption effect of semiconductor waveguides. / A gate type switch can be used.

  An optical circuit including an optical switch and an OEIC in which a light emitting / receiving element and an electronic circuit are integrated can be monolithically or hybridly integrated. FIG. 4 shows an optical circuit integrated optical module 600 by integrating the optical module 6 provided in the optical transmission apparatus of the present invention and the optical circuit including the optical switch into one element. With this configuration, an optical transmission device with high stability, reliability, and durability can be realized. The optical switch system to be integrated is not limited to the combination of two 1 × 2 optical switches and two couplers 5, and various optical switches described above can be employed.

  The optical transmission apparatus of the present invention can be applied to an optical synchronous network including a ring-shaped optical network in which a plurality of nodes are connected and a ladder-type optical network.

FIG. 5 is a diagram showing a configuration of a coaxial transmission device 100 which is the second embodiment of the transmission device of the present invention. FIG. 5A shows a case where a transmission / reception coaxial cable is correctly connected, and FIG. 5B shows a case where a transmission coaxial cable and a reception coaxial cable are mistakenly connected.
The coaxial transmission apparatus 100 includes a coaxial connector receiving connector 16, an unbalanced-balanced conversion transformer 15, a balanced 1 × 2 duplex relay 14, a coupler 5 for combining / branching light, and a line interface unit. (LIU) 13, framer 7, and CPU 8.
The difference in configuration between the optical transmission device 1 in FIG. 1 and the coaxial transmission device 100 in FIG. 5 is as follows. The 2 × 2 optical switch composed of the optical switch 4 and the coupler 5 in FIG. 1 is replaced with the unbalanced-balanced conversion transformer 15 in FIG. 5 and a balanced 1 × 2 double relay 14, and the optical module 6 is replaced with the LIU 13. ing. This difference is due to the fact that the input / output cable 3 is changed from the optical fiber to the coaxial cable 17.
The LIU 13 is similar to the ITU-T G.264 in that the optical module 6 has an optical transmission / reception function and a signal detection function such as code identification and peak detection. 703 and ANSI. It has the same function as the function of transmitting and receiving electrical digital signals compliant with the T1.102 standard and the signal detection function of the optical module 6.
The framer 7 is the same as the framer shown in FIG.

With reference to FIG. 5A, a signal path on the receiving side will be described. The reception signal from the reception coaxial cable 17-1 connected to the reception coaxial connector 16-1 is converted from an unbalanced signal to a balanced signal by the transformer 15-1, transmitted through the relay 14, and connected to the LIU 13. Input to the receiver. The LIU 13 code-identifies the received signal, sends the identified signal to the framer 7, and sends the received signal detection state information to the CPU 8 at the same time. The framer 7 separates data from the received signal and outputs it to the outside of the transmission apparatus, and simultaneously sends information on the synchronization state of the received signal to the CPU 8.
Next, in the signal path on the transmission side, transmission data from the data input / output 12 is added to the overhead by the framer 7 and assembled into a transmission frame structure. Then, it is sent to the transmission coaxial cable 17-2 through the LIU 13, the relay 14, the unbalance-balance conversion transformer 15, and the transmission coaxial connector 15-2.
Similarly to the first embodiment, it is assumed that the transmission signal has a signal format in which an ATM signal is multiplexed on a payload in a synchronous transfer mode (SONET / SDH). However, it goes without saying that the signal format is not limited to this format.
As shown in FIG. 2, the framer 7 includes a frame synchronization / recovery circuit 71, a monitoring register 73, an ATM layer interface 72, a controller interface 74, and a frame generation circuit 75.
The frame synchronization / recovery circuit 71 monitors the synchronization pattern included in the overhead in the SONET / SDH frame from the output signal of the LIU 13. The monitoring register 73 stores synchronization state information output from the frame synchronization / recovery circuit 71. The ATM layer interface 72 outputs an ATM signal separated from the payload of the SONET / SDH frame by the frame synchronization / recovery circuit 71. The controller interface 74 controls the interface between the CPU 8 and the framer. The frame generation circuit 75 multiplexes the ATM signal 12 input from the outside of the coaxial transmission device 100 via the ATM layer interface into the SONET / SDH frame.
The CPU 8 reads the synchronization state 10 of the monitoring register via the controller interface 74. The CPU 8 sends a relay control 18 when it becomes necessary to control the switching state of the optical switch 4 from the signal detection state 9 and the synchronization state 10.
The transmission signal is transmitted to the LIU 13 after the ATM signal is multiplexed into the SONET / SDH frame by the frame generation circuit 75.

As shown in FIG. 5B, the reception coaxial cable 17-1 is connected to the transmission coaxial connector 16-2, and the transmission coaxial cable 17-2 is connected to the reception coaxial connector 16-1. Suppose an incorrect connection work is performed. The CPU 8 monitors the signal detection state 9 and the synchronization state 10 of the coaxial line, and fixes the state of the relay 14 from the initial state to the switching state so that both signal detection and synchronization are automatically in a normal state. Thereby, the optical signal from the reception coaxial cable 17-1 is correctly connected to the reception unit of the LIU 13, and the transmission signal from the transmission unit of the LIU 13 is correctly connected to the transmission coaxial cable 17-2.
This operation detects a coaxial cable misconnection based on monitoring of the detection state of the coaxial received signal and monitoring of the synchronization state, and automatically corrects the connection by a relay.
The automatic connection correction operation of this embodiment will be described with reference to the flowchart of FIG.
When the coaxial transmission device is started after the connection of the coaxial cable, the CPU sets the relay to the initial state (S11). Next, the CPU reads the optical signal detection state of the LIU (S12). When it is detected that the received signal is higher than the predetermined level (S13), the CPU reads the synchronization state from the framer monitoring register (S14). If synchronization is established, the connection state of the relay is not changed (S15).
If an optical signal is not detected in step 13, or if synchronization is not established in step 15 and if it is unstable, the CPU instructs switching of the relay (S16). Next, the CPU reads the optical signal detection state of the LIU (S17). When the received signal is detected, the CPU reads the synchronization state from the framer monitoring register (S18). If the received signal is detected and synchronization is established, the relay connection state is not changed (S19).
If an optical signal is not detected in step 17 or if synchronization is not established in step 19 and is unstable, the CPU issues an alarm and enters a standby state (S20). Then, the CPU periodically returns to the flow of reading the signal detection state and the synchronization state from the transmission device so that the disconnection failure or the transmission station failure can be distinguished from the connection construction error (S12). If the signal detection and synchronization state continues many times and returns to the state of step 20 where the alarm is issued, it is detected that the failure is not a connection construction error, but is a failure of the line or a failure of the transmitting station.
According to the present embodiment, since the coaxial cable erroneous connection is detected based on the monitoring of the coaxial reception signal detection state and the monitoring of the reception signal synchronization state, the connection can be surely automatically corrected by the relay.

  FIG. 7 shows an LIU relay integrated module 700 by integrating the LIU and relay included in the coaxial transmission apparatus of the present invention into one element. With this configuration, an optical transmission device with high stability, reliability, and durability can be realized.

  The transmission apparatus of the present invention can be applied to a synchronous network including a ring-shaped optical network in which a plurality of nodes are connected and a ladder network. In addition to measures for monitoring and recovery from failures in transmission stations and failures in transmission paths already defined in technical standards such as ITU-T and IEEE in this technical field, transmission / reception transmission paths to the optical transmission apparatus of the present invention By adding means for dealing with erroneous connection, a more reliable network can be constructed.

  The present invention can be widely used not only in transmission equipment but also in communication devices and signal connection devices using optical cables and coaxial cables.

It is a figure which shows the structure of 1st Embodiment of the transmission apparatus of this invention. It is a figure explaining the internal function of the optical module part and framer part with which 1st Embodiment of the optical transmission apparatus of this invention is provided. It is a flowchart explaining operation | movement of the automatic correction | amendment function with respect to the erroneous connection of the optical cable which 1st Embodiment of the transmission apparatus of this invention has. It is a figure explaining the integrated structure of the optical circuit integrated optical module with which 1st Embodiment of the transmission apparatus of this invention is provided. It is a figure which shows the structure of 2nd Embodiment of the transmission apparatus of this invention. It is a flowchart explaining operation | movement of the automatic correction | amendment function with respect to the misconnection of the coaxial cable which 2nd Embodiment of the transmission apparatus of this invention has. It is a figure explaining the integrated structure of the LIU relay integrated module with which 2nd Embodiment of the transmission apparatus of this invention is provided. It is a figure which shows the structure of the optical transmission apparatus which correct | amends the conventional optical fiber incorrect connection automatically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical transmission apparatus 2 Optical connector 3 Optical fiber 4 Optical switch 5 Coupler 6 Optical module 7 Framer 8 CPU
9 Signal detection state 10 Synchronization state 11 Optical switch control 12 Data input / output 13 LIU
14 relay 15 transformer 16 coaxial connector 17 coaxial cable 18 relay control 61 light receiver 62 preamplifier 63 variable gain amplifier 64 identification circuit 65 clock extraction circuit 66 peak detection circuit 71 frame synchronization / recovery circuit 72 ATM layer interface 73 monitoring register 74 controller Interface 75 Frame generation circuit 600 Optical circuit integrated optical module 100 Coaxial transmission device 700 LIU relay integrated module

Claims (13)

A transmission cable and a reception cable for transmitting and receiving transmission signals are connected to either a transmission means or a reception means via a 2-input 2-output switch, depending on the switching state of the 2-input 2-output switch. In transmission equipment,
When the reception level state of the reception means is below a predetermined level or the synchronization of the reception signal is not established,
Reversing the switching of the switch from the initial state,
A method for automatically correcting erroneous connection of a transmission / reception cable, characterized by: A transmission cable and a reception cable for transmitting and receiving transmission signals are connected to either a transmission means or a reception means via a 2-input 2-output switch and depending on the switching state of the 2-input 2-output switch. In transmission equipment,
Detecting the reception level state of the receiving means and the synchronization state of the received signal;
When the reception level state of the receiving means is below a predetermined level or the synchronization of the reception signal is not established, the switching of the switch is reversed from the initial state,
After a predetermined time elapses, again detect the reception level state of the receiving means and the synchronization state of the received signal,
When the reception level state of the receiving means is again below a predetermined level or the synchronization of the reception signal is not established, the switching of the switch is reversed again to return to the initial state,
Issuing an alarm notifying the connection failure and putting the transmission device in a standby state;
A method for automatically correcting erroneous connection of transmission / reception cables. Periodically performing the erroneous connection automatic correction method of the transmission and reception cable according to claim 2,
A method for automatically correcting erroneous connection of a transmission / reception cable, characterized by: A transmission cable and a reception cable for transmitting and receiving transmission signals are connected to either a transmission means or a reception means via a 2-input 2-output switch, depending on the switching state of the 2-input 2-output switch. In transmission equipment,
Setting the switch switching state to an initial state;
Detecting a reception level state of the receiving means;
Detecting the synchronization state of the received signal of the receiving means;
Reversing the switching of the switch when the reception level state of the reception means is below a predetermined level or when the synchronization of the reception signal is not established;
A method for automatically correcting erroneous connection of a transmission / reception cable, comprising: A transmission cable and a reception cable for transmitting and receiving transmission signals are connected to either a transmission means or a reception means via a 2-input 2-output switch, depending on the switching state of the 2-input 2-output switch. In transmission equipment,
Setting the switch switching state to an initial state;
Detecting a reception level state of the receiving means;
Detecting the synchronization state of the received signal of the receiving means;
Reversing the switching of the switch when the reception level state of the reception means is below a predetermined level or when the synchronization of the reception signal is not established;
Detecting a reception level state of the reception means and a synchronization state of the reception signal again after a predetermined time;
When the reception level state of the reception means is either below a predetermined level or when the synchronization of the reception signal is not established, the step of reversing the switching of the switch again to return to the initial state;
Issuing a warning notifying of a connection failure and placing the transmission device in a standby state;
A method for automatically correcting erroneous connection of a transmission / reception cable, comprising: Further, periodically performing the automatic connection error correction method of the transmission and reception cable,
The method for automatically correcting erroneous connection of a transmission / reception cable according to claim 5. A transmission cable and a reception cable for transmitting and receiving transmission signals are connected to either a transmission means or a reception means via a 2-input 2-output switch, depending on the switching state of the 2-input 2-output switch. A transmission device,
When the reception level state of the reception means is below a predetermined level or the synchronization of the reception signal is not established,
Means for automatically correcting erroneous connection of the transmission / reception cable by reversing the switching of the switch;
A transmission apparatus comprising: A transmission cable and a reception cable for transmitting and receiving transmission signals are connected to either the transmission means or the reception means via a 2-input 2-output switch and depending on the switching state of the 2-input 2-output switch, A transmission apparatus comprising a control unit for controlling the two-input two-output switch and the transmission / reception unit,
The control means is
Detecting the reception level state of the receiving means and the synchronization state of the received signal;
When the reception level state of the reception means is below a predetermined level or when the synchronization of the reception signal is not established, the switching of the switch is inverted,
After a predetermined time elapses, the reception level state of the reception means and the synchronization state of the reception signal are detected again,
When the reception level state of the receiving means is again below a predetermined level or the synchronization of the reception signal is not established, the switching of the switch is reversed again to return to the initial state,
Issue an alarm to notify you of a connection failure,
Control to put the transmission device in a standby state,
A transmission apparatus characterized by that. The control means is
Periodically performing the control performed by the control means;
The transmission apparatus according to claim 8. The receiving means includes
Means for identifying and outputting the received signal, and means for detecting the level of the received signal and outputting the signal level state;
A transmission apparatus according to any one of claims 1 to 9, The receiving means includes
Means for detecting whether synchronization of the code-identified signal is established or not established and outputting information on the synchronization state of the signal;
The transmission apparatus according to claim 1, wherein The receiving means, the transmitting means, and the 2-input 2-output switch are integrated in a hybrid or monolithic manner.
The transmission apparatus according to claim 10. A plurality of transmission devices according to any one of claims 7 to 12 are connected and configured.
A transmission system characterized by that.

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