JP2005184513A - Sdh transmission apparatus and sdh transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable SDH transmission apparatus of different machine types to coexist on an SDH network. <P>SOLUTION: An SOH processing section 130 determines the situation of using D, F and reserved bytes and if the D, F and reserved bytes are used in an SDH transmission apparatus of a different machine type, a payload adding section 170 uses a payload to transmit inter-apparatus data but if the D, F and reservation bytes are not used in the SDH transmission apparatus of the different machine type, an SOH adding section 180 uses the D, F and reservation bytes to transmit the inter-apparatus data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an SDH (Synchronous Digital Hierarchy) transmission apparatus and an SDH transmission method for transmitting network operation information using section overhead (SOH), and in particular, an SDH network in which different types of SDH transmission apparatuses are mixed. The present invention relates to an SDH transmission apparatus and an SDH transmission method that make it possible to construct an SDH.

  With the tremendous spread of the Internet, the mainstream of information communication has changed to TCP / IP, and TCP / IP communication using IP over SDH has rapidly spread even in SDH networks using optical transmission technology. Yes.

  In an SDH network, an IP packet is transmitted by an SDH frame, and the SDH frame is composed of SOH, POH (Path OverHead), and a payload. Here, SOH is an area for transmitting operation information for state management and maintenance of a transmission section (section), and POH is for transmitting operation information regarding multiplexed transmission sections (paths). It is an area. The payload is an area for information transmitted by the SDH network.

  FIG. 9 shows the data structure of SOH. In the figure, the blank is an international standardized reserved byte, and the x column is a domestically used reserved byte. The D byte (D1 to D12) and the F byte (F1) are areas that can be freely used by the designer of the SDH transmission apparatus (see, for example, Non-Patent Document 1).

G707: Network node interface for the synchronous digital hierarchy (SDH), ITU-T Recommendation, April 2000.

  In a conventional SDH network, one network is usually constructed by a single type of SDH transmission apparatus. However, as the network has become IP, there are many cases where a single network is formed by a plurality of types of SDH transmission apparatuses, and the usage of D and F bytes differs depending on the model.

  In other words, in order to use the D and F bytes, it is necessary to fully understand how other models that make up the SDH network use these areas, but obtain information on other models. However, it was often difficult to take necessary actions.

  The present invention has been made to solve the above-described problems caused by the prior art, and provides an SDH transmission apparatus and an SDH transmission method capable of constructing an SDH network in which SDH transmission apparatuses of different models are mixed. With the goal.

  In order to solve the above-described problems and achieve the object, the present invention is an SDH transmission apparatus that transmits operation information of an SDH network using a section overhead, and is based on a heterogeneous SDH transmission apparatus mixed in the SDH network. A usage state determination unit that determines whether or not a usage state of a predetermined area in the section overhead is in use, and notifies the usage state determined by the usage state determination unit to other SDH transmission apparatuses of the same model And when the usage state determined by the usage state determination unit is not in use, the communication is performed for communication with another SDH transmission apparatus of the same model whose usage state is notified by the usage state notification unit. And a predetermined area using means for using the predetermined area.

  The present invention is also an SDH transmission method for an SDH transmission apparatus that transmits operation information of an SDH network using a section overhead, and includes a predetermined overhead in the section overhead by a different type of SDH transmission apparatus mixed in the SDH network. A use state determining step for determining whether or not the use state of the area is in use; a use state notifying step for notifying the use state determined in the use state determining step to other SDH transmission devices of the same model; When the use state determined by the use state determination step is not in use, the predetermined region uses the predetermined region for communication with another SDH transmission apparatus of the same model whose use state is notified by the use state notification step. And a use process.

  According to this invention, it is determined whether or not the usage state of the predetermined area in the section overhead by the different types of SDH transmission apparatuses mixed in the SDH network is in use, and the determined usage state is determined for other same models. Since a predetermined area is used for communication with another SDH transmission device of the same model that has notified the use state when the determined use state is not in use, the SDH transmission device of a different model is notified. The predetermined area can be used for communication without interfering with the communication using the predetermined area.

  The present invention is also an SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead, and a usage state of a predetermined area in the section overhead by a different type of SDH transmission apparatus mixed in the SDH network. The usage status receiving means for receiving the usage status from the SDH transmission apparatus of the same model that determines whether or not the usage status is in use, and the same model when the usage status received by the usage status receiving means is not in use And a predetermined area using means for using the predetermined area for communication with the SDH transmission apparatus.

  According to the present invention, the usage state is received from the same model SDH transmission device for determining whether or not the usage state of the predetermined area in the section overhead by the different types of SDH transmission devices mixed in the SDH network is in use. However, when the received usage state is not in use, the predetermined area is used for communication with the same model of the SDH transmission apparatus, so that the communication using the predetermined area by the different model of the SDH transmission apparatus is hindered. A predetermined area can be used for communication.

  According to the present invention, since the predetermined area is used for communication without interfering with the communication using the predetermined area in the section overhead by the SDH transmission apparatus of different models, the SDH network in which the SDH transmission apparatuses of different models are mixed is used. There is an effect that it can be constructed.

  In addition, according to the present invention, since a predetermined area in the section overhead is used for communication, the communication speed can be improved.

  Exemplary embodiments of an SDH transmission apparatus and an SDH transmission method according to the present invention will be described below in detail with reference to the accompanying drawings.

  First, the configuration of the SDH network according to the present embodiment will be described. FIG. 1 is a diagram illustrating a configuration of an SDH network according to the present embodiment. As shown in the figure, in the SDH network 10, a parent device 100, a child device A, a child device B, a child device C, two other devices X, and two other devices Y constitute a ring network.

  Here, although the parent device 100, the child device A, the child device B, and the child device C are the same model of the SDH transmission device, the models of the SDH transmission device and the other device X are different, and the other device Y is different. SDH transmission apparatus of the model. That is, the SDH network 10 includes three types of SDH transmission apparatuses.

  Then, the parent device 100, the child device A, the child device B, and the child device C, the two other devices X, and the two other devices Y respectively use inter-device data using D, F, and reserved bytes in different ways. Is transmitted. Here, operation information such as an updated program is transmitted as the inter-device data.

  Note that the parent device 100 is connected to the IP network 20, and the child device C is connected to the IP network 30. Therefore, for example, information is transmitted from the PC (personal computer) connected to the IP network 20 to the PC connected to the IP network 30 via the SDH network 10.

  The parent device 100 monitors the SDH frame transmitted on the SDH network 10, and based on the monitoring result, the parent device 100 uses the D, F, and reserved bytes of the own device, the child device A, the child device B, and the child device C. It is determined whether or not communication is performed between them, and the determination result is notified to the slave device A, slave device B, and slave device C. When the parent device 100, the child device A, the child device B, and the child device C determine that the parent device performs communication using D, F, and the reserved byte, the parent device 100, the child device A, the child device B, and the child device C perform communication using these areas.

  Specifically, the parent device 100 monitors whether or not the other device X or the other device Y performs communication using D, F, and a reserved byte, and the other device X or the other device Y detects D, F, and When communication is not performed using the reserved byte, communication is performed among the own device, the slave device A, the slave device B, and the slave device C using D, F, and the reserved byte.

  In this way, the parent device 100 monitors whether or not the other device X or the other device Y is communicating using D, F, and the reserved byte, and the other device X or the other device Y receives the D, F, and the reservation. When communication is not performed using a byte, other device X or another device is performed by performing communication among its own device, child device A, child device B, and child device C using D, F, and a reserved byte. D, F, and reserved bytes can be used without interfering with communication using D, F, and reserved bytes by Y, and an SDH network in which different models are mixed can be constructed.

  Further, when the other device X or the other device Y is not communicating using D, F, and the reserved byte, the own device, the child device A, the child device B, and the child device C using the D, F, and the reserved byte. By performing communication between the two, information transmission efficiency can be improved.

  Next, the configuration of the parent device 100 according to the present embodiment will be described. FIG. 2 is a functional block diagram illustrating the configuration of the parent device 100 according to the present embodiment. As shown in the figure, the parent device 100 includes an O / E conversion unit 110, a frame synchronization detection unit 120, an SOH processing unit 130, a payload processing unit 140, an IP packet transmission unit 150, and an IP packet reception. Unit 160, payload addition unit 170, SOH addition unit 180, frame synchronization unit 190, and E / O conversion unit 200.

  The O / E conversion unit 110 is a processing unit that receives an optical signal transmitted on the SDH network 10 and converts it into an electrical signal. The frame synchronization detection unit 120 is an electrical signal output from the O / E conversion unit 110. Is a processing unit for detecting an SDH frame.

  The SOH processing unit 130 is a processing unit that cuts out SOH from the SDH frame detected by the frame synchronization detection unit 120 and processes the SOH. In addition, the SOH processing unit 130 manages the state of the own device, and determines whether or not to perform communication using D, F, and the reserved byte based on the D, F, and the reserved byte in the SOH and the state of the own device. And the determination result is transmitted to the payload adding unit 170 and the SOH adding unit 180.

  Further, when the state of the own device is updated, the SOH processing unit 130 notifies the payload adding unit 170 of the updated state to the child device A, the child device B, and the child device C using the payload. To instruct.

  In this way, the SOH processing unit 130 manages the state of the own device, and performs communication using D, F, and the reserved byte based on the D, F, and reserved bytes in the received SDH frame and the state of the own device. By determining whether or not to perform these areas, these areas can be used only when the other apparatus X or the other apparatus Y is not using D, F and reserved bytes. Details of the SOH processing unit 130 will be described later.

  The payload processing unit 140 is a processing unit that performs processing such as extracting a payload from the SDH frame detected by the frame synchronization detection unit 120 and passing it to the IP packet transmission unit 150 if there is data to be transmitted to the IP network 20.

  The IP packet transmission unit 150 is a processing unit that transmits data received from the payload processing unit 140 to a destination connected to the IP network 20, and the IP packet reception unit 160 is data transmitted from the IP network 20 to the SDH network 10. Is a processing unit for receiving.

  The payload adding unit 170 is a processing unit that adds data to be added as the parent device 100 such as data received by the IP packet receiving unit 160 to the payload cut out by the payload processing unit 140.

  In addition, when the SOH processing unit 130 determines that the D, F, and reserved bytes are used by another device X or Y, the payload adding unit 170 transmits inter-device data using the payload. In addition, the payload adding unit 170 adds the state of the parent device 100 to the payload according to the instruction of the SOH processing unit 130.

  The SOH addition unit 180 is a processing unit that adds data to the SOH extracted by the SOH processing unit 130 if there is data to be added as the parent device 100. In addition, when the SOH processing unit 130 determines that communication between devices using D, F, and reserved bytes is performed, the SOH adding unit 180 transmits data between devices using D, F, and reserved bytes. Send.

  The SOH adding unit 180 transmits data between devices using D, F, and reserved bytes based on the determination of the SOH processing unit 130, so that the other device X or Y uses D, F, and reserved bytes. Only in the absence of these areas can these be used effectively.

  The frame synchronization unit 190 is a processing unit that synchronizes and transmits the SDH frame, and the E / O conversion unit 200 converts the electrical signal synchronized with the SDH frame into an optical signal and transmits it to the SDH network 10. Is a processing unit.

  Next, details of the SOH processing unit 130 will be described. FIG. 3 is a functional block diagram showing the configuration of the SOH processing unit 130. As shown in the figure, the SOH processing unit 130 includes an SOH detection cutout unit 131, a state storage unit 132, a state determination unit 133, a state monitoring unit 134, a test data reception processing unit 135, and an SOH using unit. 136, a payload use unit 137, and a state update unit 138.

  The SOH detection cutout unit 131 is a processing unit that detects and cuts out the SOH in the SDH frame and processes the cut out SOH. The SOH cut out by the SOH detection cutout unit 131 is used for determining whether or not D, F, and reserved bytes are used by the other device X or the other device Y.

The state storage unit 132 is a storage unit that stores the state of the parent device 100. Here, the state transition of the parent device 100 will be described. FIG. 4 is a diagram illustrating state transition of the parent device 100. As shown in the figure, the parent device 100 has four states of state ₁ , state ₂ , state ₃ and state ₄ .

State ₁ is a state in which the SDH network 10 is monitored, and the parent device 100 uses D, F, and the reserved byte when D, F, and the reserved byte are unused (all “0”). Test data is transmitted to confirm whether it is good or not, and the state transits to state _{2. If} D, F, and reserved bytes are in use, the state transits to state ₄ .

  In this example, these areas are unused when D, F, and reserved bytes are all “0”, but these areas are not used even when D, F, and reserved bytes are all “1”. It can also be used.

  FIG. 5 is a diagram illustrating an example of test data. As shown in the figure, in this test data, D, F, and reserved bytes are all set to '01010101'. The test data may be any data as long as it can be distinguished from other types of devices. Also, it is possible to check whether D, F, and reserved bytes can be used by sending and receiving multiple types of test data. You can also

State ₂ is a state of waiting for reception of test data. When the parent device 100 receives the test data as it is, it determines that D, F, and reserved bytes are usable, and transitions to state ₃ . If the test data cannot be received, it is determined that D, F, and the reserved byte cannot be used, and the state transits to state ₄ .

State ₃ is a state in which communication is performed using D, F, and reserved bytes while monitoring the communication status, and the parent device 100 performs data communication between devices that are communicated using D, F, and reserved bytes. As a result of the CRC operation, if errors occur continuously, it is determined that the use of D, F, and reserved bytes has been started by the other device X or the other device Y, and the state transitions to state ₁ .

State ₄ is a state in which D, F, and reserved bytes are not used, and the parent device 100 monitors D, F, and reserved bytes, and D, F, and reserved bytes are unused for a predetermined time, If the number M of transitions to state _{4 in a} certain time is smaller than a predetermined value a, transition to state ₁ is made.

Here, the reason for counting the number M of transitions to state ₄ in a certain period of time is that the D, F and reserved bytes are all set to “0” by default, and data other than “0” is temporarily transmitted and received. This is to respond. That is, when there is a model that temporarily uses D, F, and reserved bytes with data other than “0”, the transition between the state ₄ and the state ₁ is repeated. This is because no more than a is generated.

  Although the state transition of the parent device 100 has been described here, the parent device 100 uses the state notification area in the payload to indicate the transitioned state when the state of the parent device 100 changes, C is notified so that the child devices A, B, and C are always in the same state as the parent device 100.

  FIG. 6 is a diagram illustrating an example of a state notification area provided in the payload. This figure shows the format of the SDH frame. The RSOH, the AU-n pointer, and the MSOH constitute the SOH, and the remaining part is the payload. The positive stuff byte is an area for synchronization buffering.

  As shown in the figure, the state notification area 320 is provided in a fixed area in the payload, and the state of the parent apparatus 10 is notified to the child apparatuses A, B, and C using this state notification area 320. The serial number area 310 is an area used when determining the parent device, and details of the parent device determination method will be described later.

  Returning to FIG. 3, the state determination unit 133 determines the state of the parent device 100 based on the state stored in the state storage unit 131, and determines processing for the SDH frame based on the determined state of the parent device 100. It is a processing unit.

The state monitoring unit 134 is a processing unit that performs processing when the state of the parent device 100 is state _1. Specifically, the state monitoring unit 134 checks whether or not D, F, and reserved bytes are unused. When F and the reserved byte are unused, the SOH adding unit 180 is instructed to transmit test data and the transition to the state ₂ is determined. Further, it instructs the payload adding unit 170 to notify the child device A, child device B, and child device C of the transition to the state ₂ using the state notification area 320.

On the other hand, if D, F, and the reserved bytes are not all “0”, it is determined that the SOH cannot be used, and the payload adding unit 170 is transferred to the state ₄ to the child device A, child device B, and child device C. Instruct change notification.

The test data reception processing unit 135 is a processing unit that performs processing when the state of the parent device 100 is state _2. Specifically, when the test data is received as it is, the D, F, and reserved bytes are stored. determined as available, thereby determining a transition to state _3, the payload adding unit 170, the child device a transition to state ₃ with the status notification area 320, the child device B and slave device C Instruct to notify.

On the other hand, in the case of not receiving a test data, D, with F and reserved byte is determined not to be used to determine the transition to state _4, the payload adding unit 170, a transition to state ₄ The status notification area 320 is used to instruct the slave device A, slave device B, and slave device C to be notified.

The SOH using unit 136 is a processing unit that performs processing when the state of the parent device 100 is state _3. Specifically, the SOH using unit 136 performs CRC calculation on D, F, and reserved byte data, and continuously If an error occurs, it is determined that D, F, and the reserved bytes have been used by the other device X or the other device Y, and the transition to the state ₁ is determined. Instruct the slave device A, the slave device B, and the slave device C to notify the transition to ₁ using the state notification area 320.

The payload use unit 137 is a processing unit that performs processing when the state of the parent device 100 is state _4. Specifically, the payload use unit 137 examines D, F, and reserved bytes, and D, F, and reserved bytes are longer than a certain time. If it is unused and the number M of transitions to state _{4 in} a certain time is smaller than a predetermined value a, the transition to state ₁ is determined and the payload adding unit 170 is switched to state ₁ Instruct the slave device A, the slave device B, and the slave device C to notify the transition using the state notification area 320.

  The state update unit 138 is a processing unit that updates the state stored in the state storage unit 132 based on the state transitions determined by the state monitoring unit 134, the test data reception processing unit 135, the SOH use unit 136, and the payload use unit 137. .

  Next, the processing procedure of the SOH processing unit 130 will be described. FIG. 7 is a flowchart showing a processing procedure of the SOH processing unit 130. As shown in the figure, in the SOH processing unit 130, the SOH detection cutout unit 131 cuts out SOH from the SDH frame and processes it (step S701). In addition, the state determination unit 133 reads the state stored in the state storage unit 132 and checks the state of the own device (step S702).

As a result, when the state of the own apparatus is state ₁ , the state monitoring unit 134 determines whether or not D, F, and reserved bytes in the SOH extracted from the SDH frame are all “0”. (Step S703).

If D, F and the reserved bytes are all “0”, the SOH adding unit 180 is instructed to transmit test data (step S704), and the payload adding unit 170 is also instructed by the child device A and the child byte. The device B and the child device C are instructed to notify change to the state ₂ (step S705). Then, the state update unit 138 updates the state of the state storage unit 132 (step S706).

On the other hand, if D, F, and the reserved bytes are not all “0”, it is determined that the SOH cannot be used, and the payload adding unit 170 is transferred to the state ₄ to the child device A, child device B, and child device C. A change notification is instructed (step S709). Then, the state update unit 138 updates the state of the state storage unit 132 (step S706).

If the state of the device is state ₂ , the test data reception processing unit 135 determines whether or not the test data has returned (step S708), and if the test data has returned, the SOH Can be used, the payload adding unit 170 is instructed to notify the child device A, child device B, and child device C to change to the state ₃ (step S708). Then, the state update unit 138 updates the state of the state storage unit 132 (step S709).

On the other hand, if the test data is not returned, it is determined whether or not the test data has been changed (step S710). If the test data has been changed, the SOH cannot be used. A change notification to state ₄ is instructed to child device A, child device B, and child device C (step S711). Then, the state update unit 138 updates the state of the state storage unit 132 (step S709).

If the status of the own device is state ₃ , the SOH using unit 136 determines whether or not an error has continuously occurred in D, F, and the reserved byte (step S712), and the error has continued. Since the other device X or the other device Y may start using D, F, and the reserved bytes, the slave device A, the slave device B, and the slave device C are sent to the payload adding unit 170. A change notification to state ₁ is instructed (step S713). Then, the state update unit 138 updates the state of the state storage unit 132 (step S714).

If the state of the own device is state ₄ , the payload using unit 137 determines whether D, F, and the reserved bytes are all “0” for a predetermined time or more (step S715). In the case of '0', D, F, and reserved bytes may be used, so M
'1' is added to (step S716), and it is determined whether M is smaller than a predetermined value a (step S717).

As a result, when M is smaller than the predetermined value a, the payload adding unit 170 is instructed to notify the child device A, child device B, and child device C to change to the state ₁ (step S713). Then, the state update unit 138 updates the state of the state storage unit 132 (step S714).

  As described above, the SOH processing unit 130 checks the SOH based on the state of the parent device 100 stored in the state storage unit 132, determines whether the state transition is necessary, and if the state transition is necessary, The other device X or the other device Y makes D, F, and reservation by changing the state of the device and instructing the payload adding unit 170 to notify the child device A, child device B, and child device C of the state transition. D, F and reserved bytes can be used only when no bytes are used.

  In FIG. 1, the description has been made on the assumption that the parent device 100 is determined. However, when the SDH network is constructed, the parent device 100, the child device A, the child device B, and the child device C are in the same state. Yes, the parent device is not decided. Therefore, a process for determining a parent device will be described.

  FIG. 8 is a flowchart showing the processing procedure of the parent device determination processing. As shown in the figure, in this parent device determination process, each SDH transmission device transmits its own serial number on the serial number area 310 in the payload shown in FIG. 6 (step S801).

  When each SDH transmission device receives the serial number, it determines whether or not the received serial number is larger than the serial number of its own device (step S802). The serial number is replaced with the serial number of the device itself and transmitted (step S803).

  When any device receives the serial number of its own device (Yes in step S804), the SDH transmission device that has received the serial number of its own device becomes the parent device (step S805). On the other hand, as long as none of the devices receives the serial number of its own device (No in step S804), the comparison and replacement of the serial numbers is continued.

  In this way, when each SDH transmission device transmits its own serial number and receives the serial number, it compares it with its own serial number, and if it is greater than its own serial number, the received serial number is converted to its own serial number. The SDH transmission device with the smallest serial number can be determined as the parent device by transmitting the data as a parent device.

  As described above, in the present embodiment, the SOH processing unit 130 determines the use status of D, F, and reserved bytes, and when D, F, and reserved bytes are used in the other device X or the other device Y. When the payload adding unit 170 transmits inter-device data using the payload, and the D, F, and reserved bytes are not used in the other device X or the other device Y, the SOH adding unit 180 sets the D, F, and Since the inter-device data is transmitted using the reserved bytes, it is possible to construct an SDH network by mixing different types of SDH transmission devices.

  In this embodiment, the parent device 100 has been described. However, the child device stores the state transmitted from the parent device 100, and based on the stored state, D, F, and the reserved byte are used for inter-device data communication. It can be determined whether or not to use.

  In the present embodiment, the case where data between devices such as operation information is transmitted using D, F, and reserved bytes has been described. However, the present invention is not limited to this, and general communication data is transferred to D. , F and reserved bytes can be used in the same way.

  In this embodiment, the case where D, F, and reserved bytes are used together has been described. However, the present invention is not limited to this, and D bytes and reserved bytes are used by other model devices. It can be similarly applied to the case where communication is performed using only unused D bytes or reserved bytes.

(Supplementary note 1) An SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead,
Use state determination means for determining whether or not the use state of a predetermined area in the section overhead by the different types of SDH transmission apparatuses mixed in the SDH network is in use;
Usage status notifying means for notifying the usage status determined by the usage status determining means to other SDH transmission devices of the same model;
A predetermined area in which the predetermined area is used for communication with another SDH transmission apparatus of the same model whose use state is notified by the use state notifying means when the use state determined by the use state determining means is not in use. And an SDH transmission device.

(Supplementary note 2) An SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead,
Usage state for receiving the usage status from the same model SDH transmission device for determining whether the usage status of the predetermined area in the section overhead by the different SDH transmission device mixed in the SDH network is in use Receiving means;
SDH transmission apparatus, comprising: predetermined area use means for using the predetermined area for communication with an SDH transmission apparatus of the same model when the use state received by the use state reception means is not in use .

(Additional remark 3) It is determined whether the use state of the predetermined area in the section overhead by the different types of SDH transmission apparatuses mixed in the SDH network is in use, and the determined use state is determined to be the same as the other same model. The SDH transmission apparatus according to appendix 1 or 2, further comprising a parent apparatus determination unit that determines the SDH transmission apparatus to be notified to the SDH transmission apparatus as a parent apparatus.

(Additional remark 4) The said use condition determination means monitors the predetermined area | region in the said section overhead, and when it is estimated from the monitoring result that this predetermined area is not used, test data is sent to this predetermined area. The SDH transmission apparatus according to appendix 1, wherein the use state is determined based on whether or not the transmitted test data is returned by additionally transmitting to the SDH network.

(Supplementary note 5) The SDH transmission apparatus according to Supplementary note 1 or 2, wherein the predetermined area in the section overhead is composed of a D byte, an F byte, and a reserved byte.

(Supplementary note 6) An SDH transmission method of an SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead,
A use state determination step of determining whether or not a use state of a predetermined area in the section overhead by a different type of SDH transmission apparatus mixed in the SDH network is in use;
A usage status notification step of notifying the usage status determined in the usage status determination step to other SDH transmission devices of the same model;
When the use state determined by the use state determination step is not in use, the predetermined region uses the predetermined region for communication with another SDH transmission apparatus of the same model whose use state is notified by the use state notification step. An SDH transmission method comprising: a use process.

(Supplementary note 7) An SDH transmission method of an SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead,
Usage state for receiving the usage status from the same model SDH transmission device for determining whether the usage status of the predetermined area in the section overhead by the different SDH transmission device mixed in the SDH network is in use Receiving process;
An SDH transmission method comprising: a predetermined area using step of using the predetermined area for communication with an SDH transmission apparatus of the same model when the usage state received in the usage state receiving step is not in use; .

(Supplementary note 8) It is determined whether or not the usage state of the predetermined area in the section overhead by the different types of SDH transmission apparatuses mixed in the SDH network is in use, and the determined usage state is determined to be the same as another model. The SDH transmission method according to appendix 6 or 7, further comprising a parent device determination step of determining an SDH transmission device to be notified to the SDH transmission device as a parent device.

(Supplementary Note 9) The use state determination step monitors a predetermined area in the section overhead, and when it is estimated from the monitoring result that the predetermined area is not used, test data is stored in the predetermined area. 7. The SDH transmission method according to appendix 6, wherein the use state is determined based on whether or not the transmitted test data is returned after being transmitted to the SDH network.

(Supplementary note 10) The SDH transmission method according to supplementary note 6 or 7, wherein the predetermined area in the section overhead is composed of a D byte, an F byte, and a reserved byte.

  As described above, the SDH transmission apparatus and the SDH transmission apparatus method according to the present invention are useful for constructing an SDH network, and particularly when it is necessary to construct an SDH network by mixing SDH transmission apparatuses of different models. Are suitable.

It is a figure which shows the structure of the SDH network which concerns on a present Example. It is a functional block diagram which shows the structure of the parent apparatus which concerns on a present Example. It is a functional block diagram which shows the structure of a SOH process part. It is a figure which shows the state transition of a parent apparatus. It is a figure which shows an example of test data. It is a figure which shows an example of the status notification area | region provided in a payload. It is a flowchart which shows the process sequence of a SOH process part. It is a flowchart which shows the process sequence of a parent apparatus determination process. It is a figure which shows the data structure of SOH.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 SDH network 20,30 IP network 100 Master apparatus 110 O / E conversion part 120 Frame synchronization detection part 130 SOH processing part 131 SOH detection extraction part 132 State memory | storage part 133 State determination part 134 State monitoring part 135 Test data reception process part 136 SOH usage unit 137 Payload usage unit 138 Status update unit 140 Payload processing unit 150 IP packet transmission unit 160 IP packet reception unit 170 Payload addition unit 180 SOH addition unit 190 Frame synchronization unit 200 E / O conversion unit 310 Serial number area 320 Status notification region

Claims (5)

An SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead,
Use state determination means for determining whether or not the use state of a predetermined area in the section overhead by the different types of SDH transmission apparatuses mixed in the SDH network is in use;
Usage status notifying means for notifying the usage status determined by the usage status determining means to other SDH transmission devices of the same model;
A predetermined area in which the predetermined area is used for communication with another SDH transmission apparatus of the same model whose use state is notified by the use state notifying means when the use state determined by the use state determining means is not in use. And an SDH transmission device. An SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead,
Usage state for receiving the usage status from the same model SDH transmission device for determining whether the usage status of the predetermined area in the section overhead by the different SDH transmission device mixed in the SDH network is in use Receiving means;
SDH transmission apparatus, comprising: predetermined area use means for using the predetermined area for communication with an SDH transmission apparatus of the same model when the use state received by the use state reception means is not in use .   The usage state determination means monitors a predetermined area in the section overhead, and when it is estimated from the monitoring result that the predetermined area is not used, adds test data to the predetermined area and adds the test data to the predetermined area. The SDH transmission apparatus according to claim 1, wherein the use state is determined based on whether the transmitted test data is returned to the SDH network.   The SDH transmission apparatus according to claim 1 or 2, wherein the predetermined area in the section overhead is composed of a D byte, an F byte, and a reserved byte. An SDH transmission method of an SDH transmission apparatus for transmitting operation information of an SDH network using a section overhead,
A use state determination step of determining whether or not a use state of a predetermined area in the section overhead by a different type of SDH transmission apparatus mixed in the SDH network is in use;
A usage status notification step of notifying the usage status determined in the usage status determination step to other SDH transmission devices of the same model;
When the use state determined by the use state determination step is not in use, the predetermined region uses the predetermined region for communication with another SDH transmission apparatus of the same model whose use state is notified by the use state notification step. An SDH transmission method comprising: a use process.

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