JP2007166137A - Transmission line interface switching method and transmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission line interface switching method and a transmitter, wherein a type of a transmission line interface on an opposite transmitter side is automatically recognized, its own apparatus is switched according to the type of the transmission line interface, so as to correctly and quickly connect between the transmission apparatuses. <P>SOLUTION: A selection section 1-4 selects one of transmission line optical interface sections 1-5 to 1-8 and the selected interface section is connected to the opposite transmitter via a transmission line. Looping back an optical signal from the opposite transmitter at an optical loopback section 1-3 as it is and its release are repeated at a particular time interval corresponding to the type of the transmission line optical interface, the optical signal from the opposite transmitter is received, whether or not a reception presence state and a reception absence state of the optical signal at a particular time interval are repeated is discriminated, the type of the transmission line optical interface used by the opposite transmitter is specified on the basis of the particular time interval, and the selection of the selection section 1-4 is switched to the transmission line optical interface of the specified type of the transmission line optical interface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transmission line interface switching method and a transmission apparatus, and in particular, in a network system configured by connecting a plurality of transmission apparatuses via transmission lines, transmission usable between opposing transmission apparatuses in each transmission apparatus. The present invention relates to a transmission path interface switching method and transmission apparatus for automatically recognizing the transmission path interface type of the opposite transmission apparatus, switching to the transmission path interface type, and connecting to the opposite transmission apparatus without recognizing the transmission path interface type in advance. .

  FIG. 40 shows an example of abnormal connection in a conventional network configuration. In the example shown in the figure, the transmission apparatus A has only the 150M interface optical interface type, but the transmission apparatus B is a transmission apparatus having a plurality of optical interface types having different transmission path capacities, such as 600M, 150M, and 50M. is there.

  When a transmission line is connected between transmission apparatuses having such different transmission line interface types, the transmission line between the transmission apparatus A and the transmission apparatus A is erroneously changed to a 600M optical interface unit as shown in the figure. There is a case where it connects. When such a connection error occurs, an alarm (ALM) such as a frame abnormality is issued, and the connection on the transmission apparatus B side is switched from the 600M optical interface unit to the 150M optical interface unit by manual operation as shown in FIG. The recovery process was performed.

  In addition, when transmission devices having different transmission path interface types form a network opposite to each other, they are currently used due to an increase in data traffic of terminals confiscated by each transmission device. When switching from a transmission path interface to a transmission path interface with a larger capacity, the monitoring device that monitors the network issues an instruction to switch the transmission path interface type to each of the opposing transmission devices. The transmission line interface type of both transmission apparatuses was switched.

  In addition, when transmission apparatuses having transmission line interface types having different transmission capacities form a network opposite to each other, a failure occurs in one transmission line interface unit of the opposite transmission apparatuses, and another transmission line interface When switching the connection to the network, the monitoring device that monitors the network switches both devices of the opposite transmission device by instructing the transmission path interface type of the switching destination.

  As a prior art document related to the present invention, the following Patent Document 1 relates to an optical transmission line switching device for selectively exchanging and connecting communication devices in which a plurality of transmission rates are mixed. An optical switch that switches between the optical switch and an optical transmission line connected to each output terminal of the optical switch, converts the optical signal from the optical switch into an electrical signal, and connects the electrical signal An optical transmission line switching device that includes an output interface unit that shapes and outputs a waveform of an electrical signal of a communication device and can flexibly switch not only a known transmission format but also a signal of a new transmission format Are listed.

Further, in Patent Document 2 below, an optical fiber aggregation device is provided, and a communication control system that transmits and receives data using optical signals, a path switching unit that performs path switching of an optical fiber transmission line, and the path switching unit and optical joining A transmission / reception module including a detection unit for detecting an optical signal level, and a failure occurrence is determined based on a detection signal from the detection unit. A communication control system including an interface processing unit that controls a path switching unit and disconnects a faulty device is described.
JP 2005-64576 A JP 2003-273867 A

  When connecting to the opposite transmission device via a transmission line, it is necessary to connect the transmission line after recognizing in advance the transmission line interface type that can be used by the opposite transmission apparatus. Since the transmission line was connected by manual operation according to the transmission line interface type of the transmission device, the transmission line interface types may be mistakenly connected to each other. I was switching. For this reason, it takes a lot of time to identify the transmission line interface type required for checking the connection error, and when the opposite transmission device is in a remote location, it takes a lot of time, etc. There was a problem that I could not.

  Therefore, in the present invention, even when the transmission line interface type of the opposite transmission apparatus is not recognized in advance, the transmission line interface type on the opposite transmission apparatus side is automatically recognized, and the own apparatus is matched to the transmission line interface type. It is an object of the present invention to provide a transmission path interface switching method and a transmission apparatus that can correctly and promptly connect transmission apparatuses by switching.

  Also, when switching to a transmission path interface type having a transmission path interface type having a different transmission capacity and facing each other, a transmission path interface type having a transmission path capacity larger than the current situation, the monitoring apparatus that monitors the network is switched to the opposite transmission apparatus. Without instructing both of these devices to switch the transmission path interface type, it is possible to automatically switch to the opposite destination switching destination transmission path by simply instructing the other transmission apparatus to switch. It is an object of the present invention to provide a transmission line interface switching method and transmission apparatus capable of recognizing and switching an interface type.

  In addition, when a failure occurs in one transmission path interface unit of transmission apparatuses that have transmission path interface types with different transmission capacities, the monitoring apparatus that monitors the network transmits both of the transmission apparatus to the opposite transmission apparatuses. Without instructing the switching destination transmission path interface type, the opposing transmission equipment itself autonomously recognizes the switching destination transmission path interface type on the other side and switches, and automatically bypasses the faulty transmission path between the transmission equipment. It is an object of the present invention to provide a transmission path interface switching method and a transmission apparatus that enable the transmission path interface.

  The transmission path interface switching method of the present invention includes: (1) a plurality of transmission path optical interface units connected to opposing transmission apparatuses, one of the transmission path optical interface units being selected by a selection unit, In a transmission path interface switching method of a network system composed of a plurality of transmission devices connected to opposite transmission devices via an optical signal, an optical signal transmitted from one transmission device between the opposite transmission devices is transmitted to the other The process of repeatedly performing the loopback setting for loopback and the loopback cancellation setting for canceling the loopback setting at a specific time interval corresponding to the type of transmission line optical interface, and receiving an optical signal from the opposite transmission apparatus Determining whether or not the optical signal repeats a state of receiving and not receiving at a specific time interval; and receiving of the optical signal Based on a specific time interval in which the state and the state of none are repeated, the transmission line optical interface type used by the opposite transmission apparatus is specified, and the selection is made to the transmission line optical interface unit of the specified transmission line optical interface type And a process of switching selection of parts.

  (2) selecting a transmission path optical interface unit of a transmission path optical interface type instructed by a monitoring device that monitors the network, and returning the loopback at a specific time interval corresponding to the selected transmission path optical interface type. The setting and the loopback cancellation setting for canceling the loopback setting are repeatedly performed.

  (3) When it is detected that a failure has occurred in the transmission line optical interface type used to connect the opposite transmission apparatuses, transmission in the next order predetermined for the transmission line optical interface type is performed. The transmission path optical interface unit of the path optical interface type is selected, and the loopback setting and the loopback cancellation setting for canceling the loopback setting are repeatedly performed at a specific time interval corresponding to the selected transmission path optical interface type. It is characterized by.

  The transmission apparatus according to the present invention includes (4) a plurality of transmission path optical interface units, one of the transmission path optical interface units is selected by the selection unit, and is connected to the opposite transmission apparatus via the transmission path. In the transmission device to be provided, a return setting provided between the selection unit and the transmission path, the optical signal from the opposite transmission device is turned back as it is toward the opposite transmission device, and the return cancellation setting for releasing the return setting, An optical folding unit that repeats at a specific time interval corresponding to the type of the transmission path optical interface, an optical signal detection unit that receives an optical signal from an opposing transmission device, and an optical signal detected by the optical signal detection unit Based on the monitoring control unit for determining whether the state with reception and the state without reception are repeated at specific time intervals, and the specific time interval with which the state with reception of optical signals and the state without reception are repeated , Opposite Identify the transmission line optical interface type to be used in the transmission apparatus, and switches the selector selection of the transmission line optical interface of the transmission line optical interface type that the identified.

  And (5) selecting a transmission path optical interface unit of the transmission path optical interface type instructed by the monitoring device that monitors the network, and setting the optical turn-back section to a specific type corresponding to the selected transmission path optical interface type. The loopback setting and the loopback cancellation setting for canceling the loopback setting are repeatedly performed at time intervals.

  (6) When it is detected that a failure has occurred in the transmission line optical interface type used for connection of the opposite transmission apparatuses, transmission in the next order predetermined for the transmission line optical interface type is performed. A transmission path optical interface unit of a path optical interface type is selected, and the optical loopback unit is configured to return the loopback setting and the loopback cancellation setting at a specific time interval corresponding to the selected transmission path optical interface type. Is repeatedly performed.

  According to the present invention, when a transmission device that is opposite to its own transmission device is newly added, etc., even if the transmission line optical interface type of the opposite transmission device is not recognized in advance on its own transmission device side, An opposing transmission device transmits an optical signal transmitted from its own transmission device in an intermittent pattern corresponding to the type of transmission line optical interface used, and transmits the optical signal on the transmission value side on the basis of the intermittent pattern. By recognizing the type and switching to the optical interface type, the connection between the transmission devices can be easily established. In addition, even when transmission devices are connected with different transmission path optical interface types due to a connection error between transmission devices, the connection can be switched from that state to an appropriate transmission path optical interface type, An erroneous connection state can be automatically recovered.

  In addition, in the present invention, when switching the transmission path optical interface type between the network monitoring device and the facing transmission device, the network monitoring device simply sends a switching instruction to one of the monitoring devices that can be monitored. Since the transmission device automatically switches the transmission line optical interface type, the transmission line optical interface type between the opposite transmission devices is automatically switched even if only one transmission device can be monitored from the network monitoring device. Is possible.

  In addition, in the present invention, when the transmission line optical interface unit fails in one transmission apparatus between the opposing transmission apparatuses and the transmission path optical interface unit is switched to the detour destination, the other transmission apparatus that is opposed automatically Since the transmission path optical interface type is switched in accordance with this, it is possible to automatically bypass the fault transmission path between the transmission apparatuses.

  1 shows the overall functional blocks in the transmission apparatus of the present invention, FIG. 2 shows the database configuration of the transmission path interface unit information of the present invention, and FIGS. 3 to 5 show the interface switching operation for connection abnormality according to the present invention. 6 to 8 show an interface switching operation by a switching instruction (command) according to the present invention, FIGS. 9 to 11 show an interface switching operation for bypassing a faulty transmission line according to the present invention, and FIG. 12 shows a transmission line. FIG. 13 shows the startup process flow on the upstream apparatus side according to the present invention, FIGS. 14 and 15 show the startup process flow on the downstream apparatus side according to the present invention, and FIG. 16 shows the interface according to the present invention. 17 shows a flow of command switching processing according to the present invention, and FIG. 18 shows an alarm (A M) shows the flow of bypass switching process when.

  19 to 21 show an embodiment of the switching operation at the start-up of the present invention, FIGS. 22 and 23 show an embodiment of the switching operation by the command of the present invention, and FIGS. 24 and 25 show the present invention. FIG. 26 to FIG. 30 show embodiments of the database configuration of the transmission path interface information of the present invention, and FIG. 31 to FIG. 35 show the start-up of the present invention. 36 to 37 show the sequence of the embodiment of the switching operation according to the command of the present invention, and FIGS. 38 and 39 show the sequence of the embodiment of the detour switching operation of the present invention. Is shown.

  In FIG. 1, reference numeral 1-1 denotes a switching unit for each route #x (x = 1 to n), which has a function of switching selection of light transmission / reception signals of the optical interface unit. Reference numeral 1-2 denotes an optical reception detection unit that detects whether or not an optical signal is received. 1-3 is an optical folding unit having a switching function of transmitting an optical signal selected by the selection unit 1-4 or returning an optical signal received by the optical reception detection unit 1-2 as it is.

  1-4 is a selection unit, which is one of the optical signals transmitted from the optical interface units 1-5 to 1-8 accommodated under the route #x (x = 1 to n) switching unit 1-1. The optical signal received by the optical reception detection unit 1-2 is transmitted in parallel to the optical interface units 1-5 to 1-8. Reference numerals 1-5 to 1-8 denote optical interface units which convert the data multiplexed by the multiplexing unit 1-9 into respective transmission path frames, convert them into optical signals, and route #x switching unit 1- Send to 1.

  1-5 is a 2.4 G optical interface unit with a transmission path capacity of 2.4 Gbit / sec, 1-6 is a 600 M optical interface unit with a transmission path capacity of 600 Mbit / sec, and 1-7 is a 150 M optical interface unit. The path capacity is 150 Mbit / sec, 1-8 is a 50 M optical interface unit, and the transmission path capacity is 50 Mbit / sec.

  The path #x switching unit 1-1 and the optical interface units 1-5 to 1-8 that are paired with the opposite transmission device under the route #x switching unit 1-1 are provided with a plurality of types. A multiplexing unit 1-9 multiplexes / separates input / output data of each terminal interface unit 1-10. A terminal interface unit 1-10 accommodates data from the terminal. Each data from the terminal is assigned to a payload portion of each transmission path frame as shown in FIG. The transmission path frame has a different frame structure for each optical interface type, and each transmission path frame is composed of an overhead (OH) portion and a payload portion.

  A monitoring control unit 1-11 periodically monitors each functional unit in the transmission apparatus, and detects an alarm (ALM) and performs various controls on each functional unit. A database storage unit 1-12 stores data such as transmission path interface unit information shown in FIG. A network monitoring device interface unit 1-13 has a communication interface function with a network monitoring device connected to the transmission device.

  The interface unit information in FIG. 2 includes, for each route #x (x = 1 to n), the default use identification value of the transmission path optical interface type, and the own apparatus is located upstream of the transmission path. A reference identification value indicating whether the transmission path is located on the downstream side and a recognition time for recognizing each transmission path optical interface type are set. As the recognition time, a light reception time and a reception stop time are set. Further, the reference identification value is set so as not to be the same between the opposing transmission apparatuses.

  Further, as the automatic detour destination optical interface type at the time of detecting the failure of the transmission line optical interface unit, the detour switching condition is set so as to switch to the transmission line optical interface type having a transmission capacity one less than the transmission capacity of the failed transmission line optical interface unit. It shall be set beforehand as

  That is, when the 2.4G optical interface unit fails, it switches to the 600M optical interface unit, when the 600M optical interface unit fails, it switches to the 150M optical interface unit, and when the 150M optical interface unit fails, it switches to the 50M optical interface unit. When there is a failure in the switching or 50M optical interface unit, there is no detour switching destination.

  The operation of the present invention will be described for a case where transmission apparatuses having the same function are connected to each other. As shown in FIG. 3, when the transmission apparatus A and the transmission apparatus B are opposed to each other to form a network, the reference identification for the route # 1 of the transmission apparatus B is stored in the transmission path interface information database table. Assume that upstream, default used interface type = 600M interface is set, and reference identification = downstream, default used interface type = 150M interface is set for the route # 1 of the transmission apparatus A.

  When the respective transmission apparatuses A and B are started up, the transmission apparatus B uses the process (a) in FIG. 13 to select the route # 1 switching unit selection unit 1- 4 is selected for transmission. In this case, since the default is 600M, the selection of the route # 1 switching unit selection unit 1-4 is set to select the optical signal from the 600M optical interface unit, and the loopback setting in the optical loopback unit 1-3 is canceled. To do.

  After that, as part of the monitoring process in the transmission apparatus, the process proceeds to the interface unit monitoring process of FIG. 16, and periodically checks the optical reception state in the optical reception detection unit 1-2 in the process (a) of FIG. Then, it is confirmed whether the light receiving / non-receiving state continuously repeats the receiving / non-receiving pattern at specific intervals.

  In the process (a) of FIG. 14, the transmission apparatus A uses the transmission path optical interface of the default use interface identification defined in the transmission path interface information table for each transmission path optical interface section under all the routes used. Check whether the received frame is normal or not. In this example, since the default use interface type is 150M, the state of the received frame of the 150M optical interface unit 1-7 is checked.

  In the above case, since the type of the connected optical interface is different from that of the opposite device, the received frame confirmation retry is over, and the use defined in the transmission path interface information table by the process (g) in FIG. Determine the optical aliasing setup time and release time for interface identification. In this case, since it is a 150M optical interface unit, the turn-back time is 4 seconds and the release time is 4 seconds.

  Next, according to the process (h) in FIG. 15, the loopback setting and the loopback cancellation setting are continuously performed by the optical loopback unit 1-3 in the route # 1 switching unit at the loopback time interval extracted by the above process. In the case of this example, 4 second folding setting → 4 second folding release setting → 4 second folding setting → 4 second folding release setting. Also, in the 150M optical interface unit under the route # 1 corresponding to the used interface type, it is checked whether the received frame becomes normal continuously for one minute.

  Accordingly, in the transmission apparatus B, the optical reception detection unit 1-2 confirms that the reception state of the optical signal is a pattern with / without reception at a specific interval by the process (a) of FIG. Confirm. Next, by the process (c) of FIG. 16, the transmission path optical interface identification of the opposite transmission path apparatus is specified based on the interval between the light reception time and the non-reception time. In this case, it is identified that 4 seconds have been received and 4 seconds have not been received, and it is determined that the type of the opposite-side transmission path optical interface is a 150M optical interface unit. 4 is switched from the 600M optical interface unit 1-6 to the 150M optical interface unit 1-7. As a result, the state shown in FIG. 4 is obtained.

  Next, on the transmission apparatus A side, the process (h) in FIG. 15 determines that the received frame is normal in the 150M optical interface unit 1-7 under the route # 1 corresponding to the used interface type, With the process (j) of FIG. 15, the selection of the transmission system of the route # 1 switching unit selection unit 1-4 is set to the 150M optical interface side, and the loopback state of the optical loopback unit 1-3 is set to the release setting. As a result, the state shown in FIG. 5 is obtained. In addition, after each transmission apparatus is started up, in the process (a) of FIG. 16, the light reception presence / absence states of the light reception detection units 1-2 in all the used route #x switching units are periodically checked. To check.

  Next, a case will be described in which the state where the transmission apparatus A and the transmission apparatus B are connected by the interface of the 150M optical interface type as shown in FIG. 5 is changed to the interface of the 600M optical interface type. In this case, as shown in FIG. 6, from the network monitoring device 6-1 to the transmission device B, the corresponding route, in this case, the used transmission path optical interface type under the route # 1, is switched to the 600M optical interface. Issue a switch command.

  The transmission apparatus B obtains the optical turnaround time and the release time corresponding to the switching destination optical interface type from the interface information table of FIG. 2 by the process (a) of FIG. In this case, since the switching destination optical interface type is a 600M optical interface, the turn-back time is 6 seconds and the release time is 6 seconds.

  Next, by the process (b) of FIG. 17, the return setting and the return cancellation setting are continuously performed in the optical return unit 1-3 in the route # 1 switching unit. In this case, 6-second loopback setting → 6-second loopback cancellation setting → 6-second loopback setting → 6-second loopback cancellation setting is continued. Also, in the 600M optical interface unit 1-6, which is the type of optical interface used, it is checked whether the received frame becomes normal continuously for one minute.

  As a result, in the transmission apparatus A, the light reception state in the light reception detection unit 1-2 is a pattern of presence / absence of reception at specific intervals by the process (a) of the interface unit monitoring process of FIG. Confirm. Next, by the process (c) of FIG. 16, the transmission path optical interface type of the opposite transmission path apparatus is identified and specified based on the interval between the reception time and the non-reception time. In this case, since 6 seconds have been received and 6 seconds have not been received, it is determined that the type of the opposite-side transmission path optical interface is a 600M optical interface, and the transmission system of the selection unit 1-4 is performed by processing (d) in FIG. The selection is switched from the 150M optical interface unit 1-7 to the 600M optical interface unit 1-6. The operation at this time is shown in FIG.

  Next, on the side of the transmission apparatus B, in the process (c) of FIG. 17, it is determined that the received frame is normal in the 600M optical interface unit 1-6 under the route # 1 that is the used interface type. In the process (d), the selection of the route # 1 switching unit selection unit 1-4 is set to the 600M optical interface side, and the return state of the route # 1 switching unit return unit 1-3 is set to be canceled. As a result, the state shown in FIG. 8 is obtained, and the transmission apparatus A and the transmission apparatus B can be switched so as to be connected by the 600M optical interface.

  Next, a switching operation for detouring a transmission path failure according to the present invention will be described. In each transmission apparatus, when a failure of the transmission path optical interface unit is detected during the monitoring operation of each functional unit, a switching process to the detour optical interface unit is performed according to the processing flow of FIG. For example, as shown in FIG. 8, in a state where the transmission apparatus A and the transmission apparatus B are connected by the 600M optical interface, the 600M optical interface section 1-6 under the route # 1 used in the transmission apparatus B is used. 9, the operation shown in FIG. 9 is performed, and the detour destination transmission path optical interface unit is obtained according to the detour condition predetermined according to the type of the broken transmission path optical interface by the process (b) of FIG.

  In this case, since the failed transmission path optical interface unit is the 600M optical interface unit, the detour destination is the 150M optical interface unit under the route # 1. The transmission apparatus B obtains the optical turnaround time and the release time corresponding to the switching destination optical interface type from the transmission path interface information table of FIG. 2 by the process (c) of FIG.

  In this case, since the type of the switching destination optical interface is a 150M interface, the turn-back time is 4 seconds and the release time is 4 seconds. Next, by the process (d) of FIG. 18, the loopback setting and the loopback cancellation setting are continuously performed by the optical loopback unit 1-3 in the route # 1 switching unit. In this case, the 4-second loopback setting → the 4-second loopback release setting → the 4-second loopback setting → the 4-second loopback cancellation setting is continued.

  In addition, in the 150M optical interface section under the route # 1 that is the used interface type, it is checked whether the received frame becomes normal continuously for one minute. As a result, in the transmission apparatus A, the light reception state in the light reception detection unit 1-2 is a pattern of presence / absence of reception at specific intervals by the process (a) of the interface part monitoring process flow of FIG. Confirm.

  Next, by the process (c) of FIG. 16, the optical interface type of the opposite transmission path device is identified and specified based on the interval between the reception time and the non-reception time. In this case, 4 seconds are received and 4 seconds are not received, and it can be determined that the optical interface type on the opposite side is a 150M optical interface, and the transmission system selection of the selection unit 1-4 is performed by processing (d) in FIG. Are switched from the 600M optical interface unit 1-6 to the 150M optical interface unit 1-7. As a result, the state shown in FIG. 10 is obtained.

  Next, on the transmission apparatus B side, the process (d) in FIG. 18 determines that the received frame is normal in the 150M optical interface unit 1-7 under the route # 1 that is the used interface type. By the process (f), the selection of the route # 1 switching unit selection unit 1-4 is set to the 150M optical interface, and the return state of the route # 1 switching unit return unit 1-3 is set to the release setting. As a result, the state shown in FIG. 11 is obtained, and the transmission apparatus A and the transmission apparatus B can be switched so as to be connected by the detour destination 150M optical interface.

  Next, an example of the switching operation at the start-up of the present invention will be described. FIG. 19 shows a network configuration of this embodiment. In the figure, when the transmission apparatus 100 and the transmission apparatus 111 are already connected and a network is configured, when the transmission apparatuses 112, 113, and 200 are newly added and connected, the sequence shown in FIGS. This will be described with reference to the drawings.

  The transmission apparatus 100 is the transmission path interface information database of FIG. 26, the transmission apparatus 111 is the transmission path interface information database of FIG. 27, the transmission apparatus 112 is the transmission path interface information database of FIG. 28, and the transmission apparatus 113 is the transmission of FIG. The channel interface information database and the transmission apparatus 200 each have a channel interface information database in FIG. 30 in advance, and use them respectively. When each transmission apparatus is started up, the processing flow of FIG. 13 is performed for the transmission path route whose reference identification is upstream, and the transmission path route whose reference identification is downstream is illustrated in FIG. Operates according to the processing flow.

  Further, after the start-up, the operation of the flow of FIG. 16 is performed as part of the monitoring operation in the transmission apparatus. It is assumed that the connection between the transmission apparatus 100 and the transmission apparatus 111 has already been established with the 2.4G optical interface type. FIG. 31 shows an operation sequence diagram when the transmission apparatus 112 is newly connected from this state. In the transmission apparatus 111, the reference identification (see FIG. 27) of the interface unit information route # 1 is upstream, and the default use selection system is 2.4G. The transmission system selection is switched to the 2.4G optical interface unit.

  Since the reference identification of the interface information route # 2 is downstream in the transmission device 112, the reception frame state is checked in the 2.4G optical interface unit under the route # 2 switching unit as described above, and normal for 1 minute or longer. And the transmission system selection in the route # 2 switching unit selection unit is switched to 2.4G. As a result, the transmission path connection is established between the transmission apparatus 111 and the transmission apparatus 112 with the 2.4 G optical interface type, and information on the transmission path optical interface type common to the transmission apparatuses is set from the beginning. Even if the connection is established, the connection is established by the processing flow described above.

  Next, an operation sequence when the transmission apparatus 113 is connected to the transmission apparatus 111 is shown in FIGS. In the transmission apparatus 111, the reference identification (see FIG. 27) of the interface unit information route # 3 is upstream, and the default use selection system is the 600M optical interface. The transmission system selection is set in the 600M optical interface unit, and the process proceeds to the interface unit monitoring process of FIG.

  In the transmission apparatus 113, the reference identification (see FIG. 29) is downstream in the route # 1, and the default use selection system is 150M, so the received frame state is checked in the 150M optical interface unit under the route # 1 switching unit. I do. In this case, the received frame confirmation retry is over, and the 150M interface recognition reception time and reception stop time of the route # 1 switching unit are extracted from the interface information table.

  In this case, the above time is 4 seconds received and 4 seconds not received, and the return setting time is 4 seconds and the return cancellation time is 4 seconds. Next, in the optical turn-back section in the route # 1 switching section, the 4-second turn-back setting → the 4-second turn-back release setting → the 4-second turn-back setting → the 4-second turn-back release setting is continued. The transmission apparatus 111 periodically checks the light reception state of the light detection unit in the route # 3 switching unit in the interface unit monitoring process flow of FIG. 16, and after the light reception interval is determined, the interval between the reception and non-reception times is determined. The type of the interface part is identified from the length.

  In this case, it is recognized that the type of the opposite-side transmission path optical interface is a 150 M optical interface unit by confirming that 4 seconds have been received and 4 seconds not yet received, and the transmission system selection of the selection unit in the route # 3 switching unit is set to 150 M optical. Switch to the interface section. Thereafter, the transmission device 113 checks the reception frame state of the 150M interface unit under the route # 1 switching unit, continuously checks the normality of the reception frame state for one minute or longer, and transmits the route # 1 switching unit selection unit. The system selection is switched to 150M, and the loopback setting of the optical loopback section in the route # 1 switching section is set to the release setting. As a result, a transmission line connection is established between the transmission apparatus 111 and the transmission apparatus 113 with the 150M optical interface type.

  Next, operation sequence diagrams when the transmission apparatus 200 is connected to the transmission apparatus 100 are shown in FIGS. The transmission apparatus 200 is a small transmission apparatus, and the optical interface type to be used is only the 50M optical interface unit. Similar to the operation sequence of FIG. 32 and FIG. 33, even if the transmission selection system of the selection system in the route # 3 switching unit of the transmission apparatus 100 has initially selected the 600M optical interface unit, From the operation sequence, the transmission selection of the selection system in the route # 3 switching unit is switched to the 50M optical interface unit, and the transmission line connection can be established between the transmission apparatus 100 and the transmission apparatus 200 by the 50M optical interface type. As a result, the state shown in FIG. 21 is obtained.

  By the above operation, even if the connection between transmission devices is mistakenly connected with a different transmission line optical interface type, the connection is automatically recovered from that state to the connection with the correct transmission line optical interface type. In addition, even if the transmission device side does not recognize the transmission line optical interface type of the opposite transmission device in advance, it automatically recognizes the transmission line optical interface type of the opposite transmission value side and recognizes it. It is possible to switch to the optical interface type.

  Next, an example of the switching operation by the command of the present invention will be described. In the network configuration shown in FIG. 22, in a state where the transmission apparatus 111 and the transmission apparatus 113 are connected with the 150M optical interface type, the transmission apparatus 111 and the transmission apparatus 113 are in accordance with an instruction from the network monitoring apparatus that monitors the network. The operation for switching the transmission line connection between the two types to another optical interface type will be described with reference to the operation sequence diagrams of FIGS.

  An instruction is issued from the network monitoring device to the transmission device 111 to switch the transmission line optical interface connection between the route # 3 of the transmission device 111 and the route # 1 of the transmission device 113 to a connection of the 600M optical interface type. To do. The transmission apparatus 111 that has received the switching instruction extracts the recognition time for the 600M optical interface type of route # 3 from the interface information table according to the flow of FIG.

  In this case, the recognition time is 6 seconds received and 6 seconds not received, the return setting time is 6 seconds, and the return cancellation time is 6 seconds. Next, in the optical turn-back section in the route # 3 switching section, the 6-second turn-back setting → the 6-second turn-back release setting → the 6-second turn-back setting → the 6-second turn-back release setting is continued. The transmission device 113 periodically checks the light reception state of the light detection unit in the route # 1 switching unit in the interface unit monitoring process flow of FIG. 16, and after determining the light reception interval, the length of the interval between reception and non-reception time From this, the type of the interface part is identified.

  In this case, it is recognized that the type of the transmission path optical interface on the opposite side is a 600M optical interface unit by confirming that 6 seconds have been received and 6 seconds have not been received, and the transmission system selection in the route # 1 switching unit selection unit is set to 600M. Switch to the optical interface. After that, the transmission apparatus 111 checks the reception frame state of the 600M interface unit under the route # 3 switching unit, continuously checks the normality of the reception frame state for one minute or more, and the route # 3 switching unit selection unit The transmission system selection is switched to 600M, and the loopback setting of the optical loopback section in the route # 3 switching section is set to the release setting.

  As a result, a connection is established between the transmission device 111 and the transmission device 113 with the 600M optical interface type. As a result, the state shown in FIG. 23 is obtained. With the above operation, it is possible to switch the optical interface type by automatically following the other opposing transmission device by simply instructing one of the transmission devices from the network monitoring device to switch the optical interface type. Become.

  Next, an example of detour switching according to the present invention will be described. In the network configuration shown in FIG. 24, when the 600M optical interface unit used in the transmission apparatus 113 fails in a state where the transmission apparatus 111 and the transmission apparatus 113 are connected with the 600M optical interface type, the detour destination The switching operation to the optical interface unit will be described with reference to the operation sequence diagrams of FIGS.

  The transmission apparatus 113 periodically monitors the state of each interface unit, and when a failure is detected, obtains a detour destination optical interface unit of the optical interface unit that has detected the failure according to the flow of FIG. In this case, since the 600M optical interface unit in the route # 1 is faulty, the detour destination optical interface unit becomes the 150M optical interface unit in the route # 1.

  Next, the recognition time for the 150M optical interface of route # 1 is extracted from the interface information table. In this case, 4 seconds are received and 4 seconds are not received, and the return setting time is 4 seconds and the return cancellation time is 4 seconds. Next, in the optical turn-back section in the route # 1 switching section, the 4-second turn-back setting → the 4-second turn-back release setting → the 4-second turn-back setting → the 4-second turn-back release setting is continued.

  The transmission apparatus 111 periodically checks the light reception state of the light detection unit in the route # 3 switching unit in the interface unit monitoring process flow of FIG. 16, and after receiving the light reception interval, the interval between reception and non-reception time The type of the interface part is identified from the length of. In this case, it is determined that 4 seconds have been received and 4 seconds have not been received, and it is recognized that the type of the opposite-side transmission path optical interface is the 1500M optical interface section, and the transmission system selection of the selection section in the route # 3 switching section is set to 150M optical. Switch to the interface section.

  Thereafter, the transmission device 113 checks the received frame state of the 150M interface unit under the route # 1 switching unit, continuously checks the normality of the received frame state for one minute or longer, and the route # 1 switching unit selection unit The transmission system selection is switched to 150M, and the loopback setting of the optical loopback section in the route # 1 switching section is set to the release setting. As a result, a transmission line connection is established between the transmission apparatus 111 and the transmission apparatus 113 with the 150M optical interface type.

  As a result, the state shown in FIG. 25 is obtained. As a result of the above operation, when the transmission line optical interface unit fails in one transmission apparatus between the opposite transmission apparatuses and is switched to the detour destination transmission line optical interface part, this is automatically performed in the opposite transmission apparatus. By switching to the transmission line optical interface unit of the corresponding optical interface type following the above, it is possible to automatically bypass the broken transmission line between the transmission apparatuses.

It is a figure which shows the whole functional block in the transmission apparatus of this invention. It is a figure which shows the database structure of the transmission-line interface part information of this invention. It is a figure which shows the switching operation (1/3) at the time of the connection abnormality of this invention. It is a figure which shows the switching operation (2/3) at the time of the connection abnormality of this invention. It is a figure which shows the switching operation (3/3) at the time of the connection abnormality of this invention. It is a figure which shows the switching operation (1/3) by the command of this invention. It is a figure which shows the switching operation (2/3) by the command of this invention. It is a figure which shows the switching operation (3/3) by the command of this invention. It is a figure which shows the detour switching operation | movement (1/3) of this invention. It is a figure which shows the detour switching operation | movement (2/3) of this invention. It is a figure which shows the detour switching operation | movement (3/3) of this invention. It is a figure which shows the format of a transmission-line frame. It is a figure which shows the flow of the starting process by the side of the upstream apparatus of this invention. It is a figure which shows the flow (1/2) of the starting process by the side of the downstream apparatus of this invention. It is a figure which shows the flow (2/2) of the starting process by the downstream apparatus side of this invention. It is a figure which shows the flow of the interface part monitoring process of this invention. It is a figure which shows the flow of the command switching process of this invention. It is a figure which shows the flow of the detour switching process of this invention. It is a figure which shows the Example (1/3) of the switching operation at the time of starting of this invention. It is a figure which shows the Example (2/3) of the switching operation at the time of starting of this invention. It is a figure which shows the Example (3/3) of the switching operation | movement at the time of starting of this invention. It is a figure which shows the Example (1/2) of the switching operation by the command of this invention. It is a figure which shows the Example (2/2) of switching operation by the command of this invention. It is a figure which shows the Example (1/2) of the detour switching operation | movement of this invention. It is a figure which shows the Example (2/2) of the detour switching operation | movement of this invention. It is a figure which shows the Example of the database structure of the transmission apparatus 100 of this invention. It is a figure which shows the Example of the database structure of the transmission apparatus 111 of this invention. It is a figure which shows the Example of the database structure of the transmission apparatus 112 of this invention. It is a figure which shows the Example of the database structure of the transmission apparatus 113 of this invention. It is a figure which shows the Example of the database structure of the transmission apparatus 200 of this invention. It is a figure which shows the sequence of the 1st Example of the switching operation at the time of starting of this invention. It is a figure which shows the sequence (1/2) of the 2nd Example of the switching operation at the time of starting of this invention. It is a figure which shows the sequence (2/2) of the 2nd Example of the switching operation at the time of starting of this invention. It is a figure which shows the sequence (1/2) of the 3rd Example of the switching operation at the time of starting of this invention. It is a figure which shows the sequence (2/2) of the 3rd Example of the switching operation at the time of starting of this invention. It is a figure which shows the sequence (1/2) of the Example of the switching operation by the command of this invention. It is a figure which shows the sequence (2/2) of the Example of the switching operation by the command of this invention. It is a figure which shows the sequence (1/2) of the Example of the detour switching operation | movement of this invention. It is a figure which shows the sequence (2/2) of the Example of the detour switching operation | movement of this invention. It is a figure which shows an example at the time of the abnormal connection in the conventional network structure. It is a figure which shows an example of the recovery operation | work at the time of abnormal connection in the conventional network structure.

Explanation of symbols

1-1 Switching unit for each path #x (x = 1 to n) 1-2 Optical reception detection unit 1-3 Optical folding unit 1-4 Selection unit 1-5 2.4G optical interface unit 1-6 600M light Interface unit 1-7 150M optical interface unit 1-8 50M optical interface unit 1-9 Multiplexing unit 1-10 Terminal interface unit 1-11 Monitoring control unit 1-12 Database storage unit 1-13 Network monitoring device interface unit

Claims (6)

A plurality of transmission path optical interface units connected to the opposing transmission apparatus, one of the transmission path optical interface units is selected by the selection unit, and a plurality of transmission path optical interface units connected to the opposing transmission apparatus via the transmission path In a transmission path interface switching method of a network system constituted by transmission apparatuses,
Corresponding to the type of transmission line optical interface, the return setting for returning the optical signal transmitted from one transmission device between the opposite transmission devices as it is in the other transmission device and the return cancellation setting for releasing the return setting A process that repeats at specific time intervals;
A process of receiving an optical signal from an opposing transmission device and determining whether the optical signal repeats a state with reception and a state without reception at a specific time interval;
Based on a specific time interval in which the optical signal reception state and non-reception state are repeated, the transmission line optical interface type used by the opposite transmission apparatus is specified, and transmission of the specified transmission line optical interface type is performed. A process of switching the selection unit to the road light interface unit;
A transmission path interface switching method comprising: While selecting the transmission path optical interface part of the transmission path optical interface type instructed by the monitoring device that monitors the network,
2. The transmission apparatus according to claim 1, wherein the loopback setting and the loopback cancellation setting for canceling the loopback setting are repeatedly performed at a specific time interval corresponding to the selected transmission path optical interface type. When it is detected that a failure has occurred in the transmission line optical interface type used for connection of the opposite transmission apparatus, the transmission line optical interface type of the next order predetermined for the transmission line optical interface type is determined. While selecting the transmission path optical interface part,
2. The transmission apparatus according to claim 1, wherein the loopback setting and the loopback cancellation setting for canceling the loopback setting are repeatedly performed at a specific time interval corresponding to the selected transmission path optical interface type. In a transmission apparatus having a plurality of transmission path optical interface units, selecting one of the transmission path optical interface sections by a selection unit, and being connected to an opposing transmission apparatus via a transmission path,
The type of transmission line optical interface, which is provided between the selection unit and the transmission path, and is configured to return the optical signal from the opposite transmission apparatus to the opposite transmission apparatus as it is, and the return cancellation setting to release the return setting. A light turn-back portion that repeats at specific time intervals corresponding to
An optical signal detector that receives an optical signal from an opposing transmission device;
A monitoring control unit for determining whether the optical signal detected by the optical signal detection unit is repeatedly received and not received at specific time intervals;
Based on a specific time interval in which the optical signal reception state and non-reception state are repeated, the transmission line optical interface type used by the opposite transmission apparatus is specified, and transmission of the specified transmission line optical interface type is performed. A transmission apparatus that switches the selection of the selection unit to a road light interface unit. While selecting the transmission path optical interface part of the transmission path optical interface type instructed by the monitoring device that monitors the network,
5. The optical return unit repeatedly performs a return setting and a return cancellation setting for canceling the return setting at a specific time interval corresponding to the selected transmission line optical interface type. Transmission equipment. When it is detected that a failure has occurred in the transmission line optical interface type used for connection of the opposite transmission apparatus, the transmission line optical interface type of the next order predetermined for the transmission line optical interface type is determined. While selecting the transmission path optical interface part,
5. The optical return unit repeatedly performs a return setting and a return cancellation setting for canceling the return setting at a specific time interval corresponding to the selected transmission line optical interface type. Transmission equipment.

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