JP3950234B2 - Node device and transmission line monitoring system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a transmission system in which transmission is performed in units of frames that are arranged in fields indicated by pointers individually arranged in known fields and in which a plurality of virtual containers provided as payloads are multiplexed. The present invention relates to a node device that interfaces with a transmission line and a terminal accommodated in the own station, and a transmission line monitoring system in which monitoring control of the node device is performed by a specific device via the transmission line.
[0002]
[Prior art]
In recent years, with the progress of the information society, there is a strong demand for a transmission system that can transmit a variety of transmission information inexpensively and efficiently.
In addition, the new synchronous method (SDH: Synchronous Digital Hierarchy) is capable of synchronous multiplexing of various high-speed signals as well as existing high-ararchy signals that differ in Japan, the United States and Europe, and synchronous transfer mode (STM: Synchronous This method is applicable not only to Transfer Mode) but also to Asynchronous Transfer Mode (ATM) based on broadband ISDN, and is capable of high-level maintenance and operation.
[0003]
In other words, the new synchronization method is a method capable of transmitting the various transmission information described above and providing a flexible service in the future. Many are being applied to private transmission lines.
FIG. 8 is a diagram illustrating a configuration example of a node device adapted to the new synchronization method.
In the figure, the transmission interface unit 90 includes a transmission section preceding the optical transmission path 91 (hereinafter simply referred to as “optical transmission path 91r”) and a transmission section subsequent thereto (hereinafter simply referred to as “optical transmission path 91s”). The first to third outputs of the transmission interface unit 90 and the first and second inputs are respectively connected to the first to third inputs of the frame processing unit 92 and the first and second outputs. Connected to. The first to third outputs of the frame processing unit 92 are connected to the first to third inputs of the relay processing unit 93 and the phase absorption processing unit 94, and the fourth and fifth outputs of the frame processing unit 92 are Connected to the fourth and fifth inputs of the relay processing unit 93. The first and second outputs of the relay processing unit 93 are connected to the fourth and fifth inputs of the phase absorption processing unit 94, and the output of the phase absorption processing unit 94 is multiplexed with the input of a terminal (not shown). The first input of the conversion unit 95 and the input of the control unit 96 are connected. The second and third inputs of the multiplexing unit 95 are connected to the output of the terminal and the output of the control unit 96, and the output of the multiplexing unit 95 is connected to the sixth input of the relay processing unit 93. The The first output of the timing generation unit 97 is connected to the clock inputs of the relay processing unit 93 and the frame processing unit 92, and the second to fifth outputs of the timing generation unit 97 are the seventh to seventh of the relay processing unit 93, respectively. Nine inputs and a sixth input of the phase absorption processing unit 94. The third to sixth outputs of the relay processing unit 93 are connected to the fourth to seventh inputs of the frame processing unit 92, respectively.
[0004]
The frame processing unit 92 includes a frame synchronization unit 101 and a frame generation unit 102 that are directly connected to the first to third inputs and the first and second outputs, respectively. In parallel with the reception buffer processing unit 103 directly connected to the output and the transmission buffer processing unit 104 directly connected to the fourth to seventh inputs, the frame synchronization unit 101 and the reception buffer processing unit 103 are connected in parallel. Channel pointer processing units (CP) 105-1 to 105-3 that are arranged and individually correspond to virtual containers to be described later, and are arranged in parallel between the transmission buffer processing unit 104 and the frame generation unit 102 in the same manner. Channel pointer processing units (CP) 106-1 to 106-3.
[0005]
In the conventional example having such a configuration, the timing generation unit 97 sets a value equal to or less than a period per unit octet of the baseband signal indicating the frame shown in FIG. 9 (= 25.92 (> 19.44 (= 155.52 / 8)) MHz). A device clock whose cycle is set and whose duty ratio is “0.5” is supplied to a device installed in the own station under network synchronization.
[0006]
As shown in FIG.
(1) 3 bytes composed of 9 bytes (columns) × 9 rows and arranged at a predetermined position (here, for the sake of simplicity, it is assumed that 9 bytes are arranged in the fourth row). An overheader SOH including management pointers H1 to H3;
(2) The values of these management pointers H1 to H3 (word length is 3 bytes) indicate the position of the first byte, and three virtual containers VC1 to VC1 consisting of 85 bytes (columns) × 9 rows VC3 is arranged and a payload composed of 261 bytes (columns) × 9 rows,
In addition to the baseband signal indicating the frame, the bidirectional conversion between the reception clock synchronized with the baseband signal in bit units and the optical signal modulated with the baseband signal is performed in parallel.
[0007]
Further, the transmission path interface unit 90 determines whether or not the optical signal is received normally through the optical transmission path 91r, and performs frame processing on the monitoring information indicating the determination result. Part 92 is given.
In the frame processing unit 92, the frame synchronization unit 101 captures the baseband signal (hereinafter referred to as “reception baseband signal”), the reception clock, and the monitoring information provided by the transmission path interface unit 90 as described above, and Based on the frame format shown in FIG. 9, frame synchronization with the received baseband signal is established, and these received baseband signal, received clock and monitoring information are given to the channel pointer processing units 105-1 to 105-3.
[0008]
Note that the frame synchronization unit 101 adds the result of determination as to whether or not the above-described frame synchronization is normally performed to the monitoring information described above.
The channel pointer processing units 105-1 to 105-3 extract the management pointers H1 to H3 from the fields constituting the overhead SOH described above under the frame synchronization described above, and receive baseband signals and receptions, respectively. The clock and monitoring information are delivered to the reception buffer processing unit 103.
[0009]
The channel pointer processing units 105-1 to 105-3 determine whether or not the values of the management pointers H1 to H3 are normal, and add the determination results to the above-described monitoring information.
The reception buffer processing unit 103 counts the received reception clocks while applying the values of these management pointers H1 to H3 under the frame synchronization described above, as shown in FIG.
(a) In the period in which the management pointers H1 to H3 are arranged in the overhead SOH, the first byte # 1 constituting the first management pointer H1 is the overhead.
An RT signal whose logical value is “1” only during the period arranged in the SOH;
(b) For any one of the management pointers H1 to H3 (here, for the sake of simplicity, it is assumed that the management pointer H1), the first byte among the 3 bytes constituting the management pointer H1 RCT signal whose logical value is “1” only during the period in which # 1 is arranged in the payload,
(c) For each frame period, an RDE signal whose logical value is “1” only during a period in which any of the virtual containers VC1 to VC3 is arranged in the payload
Is generated.
[0010]
Further, the phase absorption processing unit 94 is based on the combination of the logical values of the RT signal and the RDE signal described above and the RCT signal (provided via the relay processing unit 93), among the virtual containers VC1 to VC3, A period in which a virtual container (here, assumed to be a virtual container VC1 for simplicity) assigned to a terminal accommodated in the local station is given as a reception baseband signal through the frame processing unit 92 is identified. At the same time, the contents of the virtual container VC1 given during such a period are cyclically stored in a built-in buffer memory (not shown).
[0011]
The information stored in the buffer memory in this way is a specific channel assigned in advance to the terminal among the channels logically formed in the virtual container VC1 described above for the sake of simplicity. Assume that
[0012]
The timing generator 97 is applied when generating the device clock described above, and outputs a count value given by a built-in frequency divider (not shown).
Further, the phase absorption processing unit 94 refers to (decodes) such a count value in synchronization with the RT signal, the RCT signal, and the RDE signal given by the frame processing unit 92, so that the phase with respect to the optical transmission line 91r is obtained. Generates a timing signal to be applied in order to be absorbed.
[0013]
Further, the phase absorption processing unit 94 reads out the information accumulated in advance in the buffer memory described above in synchronization with the timing signal generated in this way, and among the channels logically formed in the VC1. This information is given to the terminal during a period corresponding to the specific channel described above.
When the monitoring information given from the frame processing unit 92 via the relay processing unit 93 means “some kind of failure”, the phase absorption processing unit 94 cancels the reading of the buffer memory described above or reads the read information. A process of masking (the contents of the virtual container VC1) is performed.
[0014]
By the way, the timing generation unit 97, in relation to the frame generated in its own station (including the terminal described above) in synchronization with the device clock described above, the RT signal corresponding to the above-described received baseband signal. The ST signal, the SCT signal, and the SDE signal that are equivalent to the RCT signal and the RDE signal are generated.
Further, as described above, the control unit 96 obtains a period during which transmission information is given by the terminal by using the timing at which the phase absorption processing unit 94 gives information to the terminal as a reference.
[0015]
Further, the multiplexing unit 95 generates the first transmission baseband signal by converting the transmission information given by the terminal during the period thus obtained into a format that can be placed in the virtual container VC1 described above.
[0016]
On the other hand, the relay processing unit 93 has a buffer memory (not shown) having a size capable of storing the contents of all fields other than the virtual container VC1 described above in the frame shown in FIG. 9 over the frame period. Then, by decoding the RT signal, RCT signal, and RDE signal generated by the frame processing unit 92 (reception buffer processing unit 103), the received baseband signal (not including the virtual container VC1) given together with these signals is included. ) Is cyclically stored in the buffer memory.
[0017]
Further, the relay processing unit 93
<1> The above-mentioned ST signal, SCT signal, and SDE signal are decoded to locally establish frame synchronization synchronized with the device clock,
<2> A second transmission baseband signal is generated by reading the reception baseband signal previously stored in the buffer memory under the frame synchronization,
<3> A transmission baseband signal is generated by multiplexing the second transmission baseband signal and the first baseband signal described above.
<4> Further, the transmission baseband signal, the ST signal, the SCT signal, and the SDE signal are supplied to the frame processing unit 92.
[0018]
The transmission buffer processing unit 104, the channel pointer processing units 106-1 to 106-3 and the frame generation unit 102 provided in the frame processing unit 92 are respectively the reception buffer processing unit 103 and the channel pointer processing units 105-1 to 105-3. In addition, by performing reversible processing on the processing described above performed by the frame synchronization unit 101, a transmission clock synchronized with the baseband signal described above is generated.
[0019]
Furthermore, the transmission path interface unit 90 converts the baseband signal into an optical signal in synchronization with the transmission clock, and emits the optical signal toward the optical transmission path 91s that is a subsequent transmission section.
[0020]
Therefore, at the relay point of the optical transmission path 91, the insertion and development of the transmission information that should be the source or destination of the terminal accommodated in the local station is performed with high accuracy in parallel with the relay for the subsequent transmission section.
[0021]
[Problems to be solved by the invention]
By the way, in the above-described conventional example, since all relays of the virtual containers VC1 to VC3 arranged in the payload are performed based on the synchronous multiplexing method, the relay processing unit 93 and the phase absorption processing unit 94 include the above-described buffers. Memory was provided.
[0022]
However, for such a buffer memory, since stuffing relating to the virtual containers VC1 to VC3 can be performed asynchronously, these virtual containers VC1 to VC3 and all other fields shown in FIG. 9 are individually supported. In addition to the storage areas, hardware for individually managing these storage areas and addressing must be installed.
[0023]
Therefore, in the conventional example, there is a high possibility that the hardware size will increase and high-density packaging and power consumption will be prevented.
In addition, as a known technique that can be applied to avoid such problems, for example, for a transmission system to which a new synchronization method is applied, between a preceding transmission section and a subsequent transmission section, for example. There is an SDH multiplexing system that can be configured without the above-described buffer memory by appropriately performing the related retiming.
[0024]
However, when such an SDH multiplexing method is applied, the normality of the management pointers H1 to H3 may not be ensured due to disturbances or the like occurring in the preceding transmission section, and the subsequent transmission section. However, since there is a high possibility that the disturbance of normality will spread, there are many cases where this is not actually possible.
An object of the present invention is to provide a node device and a transmission line monitoring system that can be flexibly adapted to installation conditions and can achieve a reduction in hardware size with high accuracy.
[0025]
[Means for Solving the Problems]
FIG. 1 is a block diagram showing the principle of the present invention.
The invention described in claim 1 includes a plurality of virtual containers individually defined as a set of a plurality of channels, a pointer that individually indicates the arrangement of fields in which these virtual containers are multiplexed, and Synchronize with the frame given from the preceding transmission section, and extract the pointer from the frame, and based on the pointer extracted by the synchronization control unit 11, the station is allocated in advance. Separating means 12 for extracting from the frame the own station dropped virtual container including a specific channel and a non-own station dropped virtual container including no particular channel, and the own station dropped virtual container extracted by the separating means 12 Among the multiple channels formed in the Adjust the phase to synchronize A non-own-station lost virtual container that is acquired, includes transmission information of all or a part of the plurality of channels, and has the same format as that of the own-station lost virtual container, and is extracted by the separating unit 12 Own local dropped container adapting means 13 for generating a specific virtual container synchronized with each other, out of the virtual containers included in the frame, the non-owned local dropped virtual container separated by the separating means 12, and the own local dropped container adapting means 13 And multiplexing means 14 that multiplexes the specific virtual container generated by the method into a single frame and sends it to the subsequent transmission section.
[0026]
According to a second aspect of the present invention, in the node device according to the first aspect of the present invention, the demultiplexing means 12 and the own station dropped container adaptation means 13 are instructed to specify a specific channel as station information or information adapted to the station information. The station condition adapting means 21 is provided.
According to a third aspect of the present invention, in the node device according to the first or second aspect, transmission is performed with respect to alarm channels individually arranged in a plurality of virtual containers included in a frame given from a preceding transmission section. A failure that triggers system reconfiguration when the logical value of the information is determined to be a predetermined value and the determination result is true for all transmission information of these alarm channels The processing unit 31 is provided, and the local dropped container adaptation unit 13 or the multiplexing unit 14 is true for all the alarm channels in which the determination results made by the failure processing unit 31 are individually arranged in a plurality of virtual containers. And a means for setting a value of transmission information of an alarm channel formed in a specific virtual container to a predetermined value.
[0027]
FIG. 2 is a block diagram showing the principle of the present invention.
The invention according to claim 4 is the one described in any one of claims 1 to 3, and a plurality of node devices 41-1 to 41-N individually arranged at relay points of the transmission line 40 The node devices 40-1 to 40-N are arranged on the transmission line 40 and transmit / receive information related to the monitoring control of the plurality of node devices 41-1 to 41-N via the transmission line 40. A plurality of node devices 41-1 to 41 -N, wherein any one of the plurality of virtual containers is assigned as its own dropped virtual container, The supervisory control device 42 transmits and receives information related to the supervisory control of the local station via the supervisory control channel formed in the own-station virtual container, and the supervisory control device 42 includes a plurality of node devices 41-of the plurality of virtual containers. Self-assigned to 1 to 41-N It fell appropriately identifies the virtual container, characterized by transmitting and receiving information relating to the monitoring control via the identified own station drop channel for supervisory control, which is formed in the virtual container.
[0028]
The invention according to claim 5 is a plurality of node devices 41-1 to 41-N described in any one of claims 1 to 3 and individually arranged at a relay point of the transmission path 40. The node devices 40-1 to 40-N are arranged on the transmission line 40 and transmit / receive information related to the monitoring control of the plurality of node devices 41-1 to 41-N via the transmission line 40. A plurality of node devices 41-1 to 41-N for monitoring control formed in any one of the plurality of virtual containers. The monitoring control device 42 transmits / receives information related to the monitoring control of the local station via the channel, and the monitoring control device 42 is related to the monitoring control via the monitoring control channel formed in the common virtual container among the plurality of virtual containers. It is characterized by sending and receiving information.
[0029]
In the node device according to the first aspect of the present invention, the synchronization control means 11 arranges a field in which these virtual containers are multiplexed together with a plurality of virtual containers individually defined as a set of a plurality of channels. A frame including individual pointers is given from the preceding transmission section, and the pointer is extracted while synchronizing with the frame. Based on the extracted pointer, the separating means 12 includes a local station dropped virtual container including a specific channel pre-assigned to the own station and a non-own station dropped virtual container including no specific channel. Extract from the frame described above.
[0030]
Also, the own station dropped container adapting means 13 synchronizes with the own station while accumulating the transmission information of the above-mentioned specific channel among the plurality of channels formed in the own station dropped virtual container extracted in this way. Get.
Further, the own station dropped container adapting means 13 includes transmission information of all or part of a plurality of channels formed in the own station dropped virtual container as described above, and the format is the format of the own station dropped virtual container. And a specific virtual container that is synchronized with the non-own station dropped virtual container extracted by the separation unit 12 is generated.
[0031]
The multiplexing unit 14 includes a non-own station dropped virtual container separated by the separating unit 12 among the virtual containers included in the frame described above, and a specific virtual container generated by the own station dropped container adaptation unit 13. Are multiplexed into a single frame and sent to the subsequent transmission section.
That is, of the plurality of virtual containers included in the frame given from the preceding transmission section, only the above-mentioned own-station dropped virtual container is accumulated by the own-station dropped container adapting means 14 so that the own station or own station is stored. Differences relating to the phase and transmission speed with the terminal accommodated in the terminal are absorbed and relayed to the subsequent transmission section.
[0032]
However, the non-own station dropped virtual container is relayed to the subsequent transmission section by being multiplexed with the own station dropped container without such accumulation.
Therefore, it is possible to reduce the size of the hardware and the transmission delay time as compared with the conventional example in which the non-owned dropped container is relayed based on the synchronous multiplexing method.
[0033]
In the node device according to the second aspect of the present invention, in the node device according to the first aspect, the station condition adapting means 21 supplies the station information or its station information to the separating means 12 and the own station dropping container adapting means 13. Indicates a specific channel as adapted information.
In other words, for local and non-owned virtual containers, the hardware configuration will change according to the configuration of the transmission path to be connected, the expansion, repair, maintenance, etc. of the hardware. Flexible setting is possible.
[0034]
In the node device according to the third aspect of the present invention, in the node device according to the first or second aspect, the failure processing means 31 includes a plurality of virtual containers included in a frame given from the preceding transmission section. When it is determined whether the logical value of the transmission information is a predetermined value for the alarm channels arranged individually, and the determination result is true for all the transmission information of these alarm channels Then, reconfiguration of the system is started.
[0035]
Also, the own station drop container adapting means 13 or the multiplexing means 14 is formed in a specific virtual container when the above-described determination result is true for all the alarm channels individually arranged in a plurality of virtual containers. The transmission information value of the alarm channel to be set is set to a predetermined value.
That is, for a failure that has occurred in the most recent preceding transmission section and whose determination results made by the failure processing means 31 for all of the alarm channels described above are both true, further, in the subsequent transmission section Are also notified sequentially via all alarm channels.
[0036]
Therefore, in the node devices arranged in these subsequent transmission sections, system reconfiguration is performed with high accuracy individually.
In the transmission line monitoring system according to the invention described in claim 4, the monitoring control device 42 is described in any one of claims 1 to 3 and is individually arranged at a relay point of the transmission line 40. Along with the plurality of node devices 41-1 to 41-N, the node devices 40-1 to 40-N are arranged on the transmission line 40 and transmit / receive information related to the monitoring control via the transmission line 40. The supervisory control is performed.
[0037]
Further, the monitoring control device 42 appropriately identifies the own station dropped virtual container individually allocated to the plurality of node devices 41-1 to 41-N among the plurality of virtual containers, and the identified own station dropped virtual container is specified. Information relating to the above-described monitoring control is transmitted / received through a monitoring control channel formed in the container.
On the other hand, each of the plurality of node devices 41-1 to 41-N is assigned to one of the plurality of virtual containers as its own dropped virtual container, and is used for monitoring control formed in the own dropped virtual container. The information related to the monitoring control of the own station is transmitted / received through the channel.
[0038]
That is, for the information related to the monitoring control, the information for monitoring control formed only in the own-station virtual container allocated individually to the plurality of node devices 41-1 to 41-N to be the destination or transmission source of the information. Are sent and received over the other channels.
Accordingly, the node devices 41-1 to 41-N are monitored and controlled under the leadership of the above-described monitoring control device 42 without any change in the hardware that is to be used for relaying the non-own station dropped virtual container. Is achieved.
[0039]
In the transmission line monitoring system according to the invention described in claim 5, the monitoring control means 42 is described in any one of claims 1 to 3 and individually arranged at a relay point of the transmission line 40. Along with the plurality of node devices 41-1 to 41-N, the node devices 40-1 to 40-N are arranged on the transmission line 40 and transmit / receive information related to the monitoring control via the transmission line 40. The supervisory control is performed.
[0040]
Furthermore, the supervisory control device 42 transmits and receives information related to supervisory control via a supervisory control channel formed in any one of the plurality of virtual containers.
On the other hand, the plurality of node devices 41-1 to 41-N transmit / receive information related to the monitoring control of the local station through the monitoring control channel formed in the common virtual container described above among the plurality of virtual containers. I do.
[0041]
That is, the information related to the monitoring control is transmitted via the monitoring control channel formed in the virtual container commonly allocated to the plurality of node devices 41-1 to 41-N that can be the destination or the transmission source of the information. Sent and received.
Therefore, for these node devices 41-1 to 41-N, when the virtual container in which the above-described monitoring control channel is formed corresponds to the own station dropped virtual container, the relay of the non-own station dropped virtual container is performed. In the case where the supervisory control by the supervisory control device 42 described above is achieved without any change in the hardware to be provided to the hardware, and on the contrary, it corresponds to a non-owned virtual container, standardization of the hardware configuration is performed. I can take off.
[0042]
Further, in the monitoring control device 42, since the channel for monitoring control is formed only in the common virtual container described above, the processing related to monitoring control is simplified compared to the transmission line monitoring system according to claim 4. I can take off.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0044]
FIG. 3 is a view showing an embodiment corresponding to the first and second aspects of the invention.
In the figure, components having the same functions and configurations as those shown in FIG. 8 are given the same reference numerals, and description thereof is omitted here.
[0045]
The difference between this embodiment and the conventional example shown in FIG. 8 is that a relay processing unit 71 is provided instead of the relay processing unit 93.
In the relay processing unit 71, the retiming unit 72 includes the reception baseband signal, RCT signal, RT signal, RDE signal and monitoring information generated by the reception buffer processing unit 103, and the device clock generated by the timing generation unit 97. In addition to the SCT signal, the ST signal, and the SDE signal, the first transmission baseband signal generated by the multiplexing unit 95 is provided. Among the outputs of the retiming unit 72, the output corresponding to the monitoring information described above is connected to one input of the gate circuit 73, and the output of the gate circuit 73 is connected to the phase absorption processing unit 94 via the retiming unit 72. Connected to the fourth input. Among the outputs of the retiming unit 72, the output corresponding to the RCT signal described above is connected to the input of the phase shifter 74, and the first to fourth outputs of the phase shifter 74 are the phase difference detection unit 76 and the reception channel selector 75. Connected to the first through fourth inputs. A desired channel number is given to the selection input of the reception channel selector 75, the output of the reception channel selector 75 is connected to the other input of the gate circuit 73, and the phase absorption processing unit 94 via the retiming unit 72. Connected to the fifth input. Among the outputs of the retiming unit 72, the outputs corresponding to the received baseband signal, the RT signal, and the RDE signal are connected to the corresponding inputs of the phase shifter 77, and the phase difference between the first to fourth outputs of the phase shifter 77. The first to fourth outputs of the detector 76 are connected to the first to eighth inputs of the primary selector 78, respectively.
[0046]
Among the outputs of the retiming unit 72, the output corresponding to the above-described SCT signal is one of the first input of the sub-retiming unit 79, the fifth input of the phase difference detection unit 76, and one of the timing decoder 80. And a corresponding input of the frame processing unit 92 via the retiming unit 72. Among the outputs of the retiming unit 72, outputs corresponding to the first transmission baseband signal, the ST signal, and the SDE signal are connected to the second to fourth inputs of the sub retiming unit 79, and the sub retiming unit 79. And the output of the primary selector 78 are connected to the first and second inputs of the secondary selector 81, respectively. The first to fourth outputs of the timing decoder 80 are connected to the first to fourth inputs of the transmission channel selector 82, respectively. The output of the transmission channel selector 82 is connected to the selection input of the secondary selector 81, and the output of the secondary selector 81 is connected to the fourth, sixth and seventh inputs of the frame processing unit 92 via the retiming unit 72. Is done. A device clock generated by the timing generation unit 97 is supplied to the clock terminals of the retiming unit 72 and the timing decoder 80, and a channel described later is supplied to the selection input of the transmission channel selector 82.
[0047]
As for the correspondence relationship between this embodiment and the block diagram corresponding to the invention described in FIG. 1, the transmission path interface unit 90, the frame synchronization unit 101, and the channel pointer processing units 105-1 to 105-3 are synchronized control means. 11, the reception buffer processing unit 103, the retiming unit 72, the gate circuit 73, the phase shifters 74 and 77, the reception channel selector 75 and the phase difference detection unit 76 correspond to the separating means 12, and the phase absorption processing unit 94 and The control unit 96 corresponds to the own station dropping container adaptation unit 13, the multiplexing unit 95 and the control unit 96 correspond to the multiplexing unit 14, and the reception channel selector 75 and the transmission channel selector 82 correspond to the station location condition adaptation unit 21. The control unit 96 corresponds to the failure processing unit 31.
[0048]
Hereinafter, the operation of the present embodiment corresponding to the first and second aspects of the invention will be described with reference to FIG.
First, operations of the transmission path interface unit 90, the frame processing unit 92, the phase absorption processing unit 94, the multiplexing unit 95, the control unit 96, and the timing generation unit 97 are the same as those in the conventional example shown in FIG. In the following, the description is omitted.
[0049]
In the relay processing unit 71, the retiming unit 72 is between the frame processing unit 92, the phase absorption processing unit 94, and the multiplexing unit 95 at the time of the leading edge or the trailing edge of the device clock generated by the timing generating unit 97. In the same manner as in the prior art, all signals transmitted and received are latched in parallel to synchronize these signals with the device clock.
[0050]
That is, since the components of the relay processing unit 71 operate in synchronization with the device clock described above, the operation of the retiming unit 72 will be omitted for the sake of simplicity.
The phase shifter 74 gives three RCT signals (hereinafter simply referred to as “3”) by giving each RCT signal generated by the frame processing unit 92 (reception buffer processing unit 103) a delay of 1 to 3 times the period T of the device clock. A delayed RCT signal ") is generated in parallel, and an RCT signal to which no such delay is given is supplied to the phase difference detector 76 and the reception channel selector 75 together with these delayed RCT signals.
[0051]
Note that a set of these RCT signals and three delayed RCT signals is referred to as a “multi-phase RCT signal” for simplicity.
The reception channel selector 75 is a bit string indicating the number of a specific channel pre-assigned to the terminal (here, for the sake of simplicity, it is assumed that a virtual container in which a specific channel is formed by the value of the higher order is indicated). To generate a RCT signal indicating a virtual container in which the specific channel is arranged in the multi-layer RCT signal and a time slot allocated to the specific channel among the channels formed in the virtual container. In addition, the RCT signal is given to the phase absorption processing unit 94.
[0052]
In addition, the gate circuit 73 calculates the logical product of the monitoring information generated by the frame processing unit 92 (reception buffer processing unit 103) and the RCT signal generated by the reception channel selector 75 as described above. Of the monitoring information, only the monitoring information corresponding to a specific channel assigned in advance to the terminal is extracted and given to the phase difference absorption processing unit 94.
[0053]
That is, the phase difference absorption processing unit 94 is similar to the conventional example shown in FIG. 9 under the cooperation of the retiming unit 72, the phase shifter 74, the reception channel selector 75, and the gate circuit 73 provided in the relay processing unit 71. The RCT signal and the monitoring information are given, and the reception baseband signal, the RT signal, and the RDE signal are directly given by the frame processing unit 92 (reception buffer processing unit 103).
[0054]
Therefore, unless the monitoring information described above for a specific channel formed in any one of the virtual containers VC1 to VC3 means that any failure has occurred, the terminal is connected via the specific channel in the same manner as in the conventional example. Received transmission information is given.
In addition, the phase difference detection unit 76 takes the AND of the multiphase RCT signal given by the phase shifter 74 and the SCT signal generated by the timing generation unit 97 in parallel as described above, thereby obtaining the multilayer RCT. Four determination signals indicating whether or not the phases of the four RCT signals that are signals coincide with the phases of the SCT signals are output.
[0055]
On the other hand, the phase shifter 77 is a reception baseband signal, an RT signal, and an RDE signal (hereinafter referred to as “first relayed signal”) generated by the frame processing unit 92 (reception buffer processing unit 103). In other words, three “first delayed relayed signals” are generated by giving a delay of 1 to 3 times the period T of the device clock, and combined with these “first delayed relayed signals”. Thus, the “first relayed signal” to which no delay is given is given to the primary selector 78 in parallel.
[0056]
Of the four determination signals described above, the primary selector 78 indicates that the corresponding determination result is true (means that the phase matches the phase of the SCT signal). "Signal" or one of the three "first delayed relayed signals" is selected.
The “first relayed signal” or the “first delayed relayed signal” selected by the primary selector 78 in this way is hereinafter referred to as a “specific relay signal”.
[0057]
Further, the timing decoder 80 generates three delayed SCT signals by giving the SCT signal generated by the timing generation unit 97 a delay that is 1 to 3 times the period T of the device clock, and generates these delayed SCT signals. In addition, an SCT signal to which no such delay is given is given to the transmission channel selector 82 in parallel.
[0058]
The transmission channel selector 82 is given in advance a channel number indicating a channel to be formed in a virtual container that does not include any of the specific channels described above among the virtual containers VC1 to VC3.
Further, the transmission channel selector 82 selects any one signal corresponding to the higher order value of the channel number from among the SCT signal and the three delayed SCT signals given in parallel by the timing decoder 80 as described above. (Hereinafter referred to as “applied SCT signal”).
[0059]
Further, the sub-retiming unit 79 is a “second relayed signal” composed of the ST signal and the SDE signal generated by the timing generation unit 97 in addition to the first transmission baseband signal given by the multiplexing unit 95. Is provided to the secondary selector 81 while being retimed in synchronization with the device clock.
For such a first transmission baseband signal, transmission information sent by the terminal is arranged in a specific channel previously assigned to the terminal among the channels formed in the virtual container VC1, and the other The channel is delivered from the frame processing unit 92 (reception buffer processing unit 103) via the phase absorption processing unit 94 and the multiplexing unit 95 without any insertion or development of transmission information.
[0060]
The secondary selector 81 synchronizes with the “applied SCT signal” selected by the transmission channel selector 82, and, as described above, the specific relay signal and the second relay signal given by the primary selector 78 and the sub-retiming unit 79, respectively. A relay signal is generated by alternately selecting one of the relayed signals that is adapted to the logical value of the “applied SCT signal”, and a transmission baseband signal, an ST signal, and an SDE signal that constitute the relay signal Is supplied to the frame processing unit 92.
[0061]
That is, among the virtual containers VC1 to VC3, the virtual containers VC2 and VC3 in which no specific channel allocated to the terminal is formed are passed through the buffer memory under the processing performed in the relay processing unit 71 as described above. Without being relayed from the optical transmission path 91r to the optical transmission 91s.
As described above, according to the present embodiment, only the virtual container in which any channel assigned to the terminal is formed is relayed based on the synchronous multiplexing method, and the other virtual containers are relayed based on the SDH multiplexing method. Therefore, the size of the buffer memory to be mounted can be reliably reduced as compared with the conventional example in which all virtual containers are relayed based on the synchronous multiplexing method.
[0062]
In addition, addressing, writing, and reading are achieved by installing hardware that is suitable only for the buffer memory that is actually installed, so performance and reliability can be improved as hardware size is reduced. I can take off.
Further, among the virtual containers VC1 to VC3, as described above, the channels formed in the virtual containers VC2 and VC3 that are relayed based on the SDH multiplexing method correspond to the period of accumulation in the buffer memory described above. The transmission delay time can be allowed for each transmission section, node device and terminal even when relay is performed through a plurality of transmission sections (node devices). A large degree is secured and transmission quality is improved.
[0063]
In the present embodiment, no hardware or software for giving channel numbers to the reception channel selector 75 and the transmission channel selector 82 is shown, but for such channel numbers, for example, the contacts of the DIP switch A certain value may be set as a combination, information written in the ROM in advance, or the like, and further, a value set in advance as a database such as station information may be given as appropriate through a processor that performs processing related to maintenance operation. By doing so, it may be possible to flexibly adapt to the positioning conditions.
[0064]
FIG. 4 is a view showing an embodiment corresponding to the inventions of claims 3 to 5.
In the present embodiment, two optical transmission paths 91U and 91D that are formed in an annular shape and whose transmission directions are opposite to each other are laid, and the optical transmission paths 91U and 91D are provided at relay points of these optical transmission paths 91U and 91D. The node devices 70-M and 70-1 to 70-3 are arranged by applying the inventions of claims 1 and 2 as interfaces with both of them.
[0065]
Note that the configuration of the node devices 70-M and 70-1 to 70-3 is the same as the configuration shown in FIG. 3, and therefore the description and illustration thereof are omitted here.
In addition, regarding the components of these node devices 70-M and 70-1 to 70-3, in the following, suffixes (“U” or “D”) indicating one of the corresponding optical transmission paths 91U and 91D. ) And a suffix (“M”, “1” to “3”) indicating the corresponding node device are added to the end.
[0066]
Further, regarding the correspondence relationship between this embodiment and the block diagram shown in FIG. 2, the optical transmission lines 90U and 90D correspond to the transmission line 40, and the node devices 70-M and 70-1 to 70-3 correspond to the node device 41. -1 to 41-N, the node device 70-M corresponds to the monitoring control device 42.
The operation of the present embodiment corresponding to the third aspect of the present invention will be described below with reference to FIGS.
[0067]
The node device 70-M operates as a clock master that supplies a clock to be applied to transmission by the opposing node devices 70-1 to 70-3 via the optical transmission paths 91U and 91D.
[0068]
In the node device 70-M, during the normal operation, the multiplexing units 95-UM and 95-DM, as shown by hatching in FIG. The values are constantly set to “0” under the control units 96-UM and 96-DM for the alarm channels CSA1 to CSA3 respectively assigned to the VC3.
For matters common to all of the node devices 70-1 to 70-3 facing each other via the transmission paths 91U and 91D, hereinafter, reference numeral “70” indicating these node devices 70-1 to 70-3 is used. "K" (meaning any one of 1 to 3) is added as a suffix number.
[0069]
Further, in the node device 70-K, the transmission interface unit 90-UK (90-DK) determines whether or not the optical signal is normally received from the immediately preceding preceding transmission section, and the result of the determination is When it becomes false, a monitoring signal indicating that is given to the frame processing unit 92-UK (92-DK).
It is assumed that such a monitoring signal is “0” and “1”, respectively, when the above-described determination result is true or false.
[0070]
Further, in the frame processing unit 92-UK (92-DK), the frame synchronization unit 101-UK (101-DK) establishes frame synchronization in the same manner as the conventional example, and is received under the frame synchronization, Further, it is determined whether or not all the values of the alarm channels CSA1 to CSA3 described above are “1”.
Further, the frame processing unit 92-UK (92-DK) is in a state where the result of the determination is true or the logical value of the alarm signal is “1”, the relay processing unit 71-UK (71-DK). DK) and the logical values of the received baseband signal and the alarm signal to be given to the phase absorption processing unit 94-UK (94-DK) are kept at "1".
[0071]
In addition, the relay processing unit 71-UK (71-DK) and the phase absorption processing unit 94-UK (94-DK) are predetermined to adapt to a failure occurring in the most recent transmission section preceding the optical transmission path 91U (91D). Failure processing (for example, when the optical transmission lines 91U and 91D are duplexed based on the standby redundancy scheme or the regular redundancy scheme, the processing for achieving the system reconfiguration adapted to the duplex scheme) is started. .
[0072]
Further, when such a failure occurs in the nearest transmission section of the optical transmission line 91U preceding the node device 70-2, the multiplexing unit 95-U2 provided in the node device 70-2 Among the virtual containers VC1 to VC3, a virtual container in which a channel allocated to a terminal (not shown) accommodated in its own station is arranged (here, it is assumed that it is a virtual container VC1 for simplicity). The value of the alarm channel CSA1 arranged in the same manner is constantly set to “1”.
[0073]
Further, among the virtual containers VC1 to VC3, the values (= 1) of the alarm channels CSA2 and CSA3 arranged in the same manner in the virtual containers other than the virtual container VC1 are implemented corresponding to the inventions according to claims 1 and 2. In the same manner as in the embodiment, the signal is relayed by the relay processing unit 71-U2 together with the value of the alarm channel CSA1 in the subsequent transmission section of the optical transmission line 91U.
[0074]
That is, in the node devices 70-M and 70-1 to 70-3, both the optical transmission lines 91U and 91D are not only preceded by the most recent transmission section, but any preceding that precedes via another node device. It is possible to reliably identify that a failure has occurred in the transmission section and to start the above-described failure processing.
In this embodiment, in the node devices 70-M and 70-1 to 70-3, the phase absorption processing units 94-UM and 94-U1 to 94-U3 (94-DM and 94-D1 to 94-D3) Does not indicate a combination of virtual containers to be processed as described above.
[0075]
However, with regard to such processing, for example, the phase absorption processing units 94-UM, 94-U1 to 94-U3 (94-DM, 94-D1 to 94-D3) for all of the virtual containers VC1 to VC3. By being reliably applied in any one of the above, the load and the function related to the absorption of the phase difference may be dispersed.
Hereinafter, the operation of the present embodiment corresponding to the fourth and fifth aspects of the invention will be described.
[0076]
The difference between this embodiment and the embodiment corresponding to the invention described in claim 3 is that, as shown in FIG. 4, a node device 70-m is provided instead of the node device 70-M, and the node device 70 is provided. Node devices 70a-1 to 70a-3 are provided instead of -1 to 70-3.
Note that the configuration of the node devices 70-m and 70a-1 to 70a-3 is the same as the configuration shown in FIG. 3, and therefore the description and illustration thereof are omitted here.
[0077]
In addition, regarding the components of these node devices 70-m and 70a-1 to 70a-3, in the following, subscripts (“U” or “D” indicating one of the corresponding optical transmission paths 91U and 91D). ) And a suffix (“M”, “1” to “3”) indicating the corresponding node device are added to the end.
The operation of the present embodiment corresponding to the inventions according to claims 4 and 5 will be described below with reference to FIGS.
[0078]
In the node device 70-m, the phase absorption processing unit 94-mU (94-mD), the multiplexing unit 95-mU (95-mD), and the control unit 96-mU (96-mD) are connected to the relay processing unit 71-mU. By linking with (71-mD), the relay processing is performed for all of the virtual containers VC1 to VC3.
In the course of such relay processing, the control unit 96-mU (96-mD) is individually arranged in the virtual containers VC1 to VC3 and the node devices 70a-1 to 70a- as shown in FIG. Information related to such monitoring control is appropriately transmitted and received via channels (hereinafter referred to as “monitoring control channels”) CSA1 to CSA3 to be respectively applied to the monitoring control 3.
[0079]
On the other hand, in the node device 70a-1, the phase absorption processing unit 94-1U (94-1D), the multiplexing unit 95-1U (95-1D), and the control unit 96-1U (96-1D) are connected to the relay processing unit 71. By linking with -1U (71-1D), relay processing based on the synchronous multiplexing method is performed only for the virtual container VC1.
Further, the control unit 96-1U (96-1D) includes a phase absorption processing unit 94-1U (94-1D), a multiplexing unit 95-1U (95-1D), and a relay processing unit 71-1U (71-1D). The relay process is performed on the virtual container VC1, and the relay process is arranged in the virtual container VC1 and applied to the monitoring control of the node device 70a-1 as shown in FIG. Information related to such supervisory control is appropriately transmitted and received via the supervisory control channel CSA1.
[0080]
As for the operation of the node devices 70a-2 and 70a-3, the relay processing based on the synchronous multiplexing method described above is performed not on the virtual container VC1, but on specific channels formed in the virtual containers VC2 and VC3, respectively. In addition, since transmission / reception of information related to supervisory control is the same except that it is performed via the supervisory control channels individually formed in the similar virtual containers VC2 and VC3, description thereof is omitted here.
[0081]
That is, the monitoring control channel to be used for the monitoring control of the node devices 70a-1 to 70a-3 is a virtual in which the relay processing is performed in each of the node devices 70a-1 to 70a-3 based on the synchronous multiplexing method. Formed in containers VC1 to VC3.
Therefore, regarding the monitoring control of the node devices 70a-1 to 70a-3 and the maintenance and operation performed under the monitoring control, the number of virtual containers that should be relayed based on the synchronous multiplexing method is unnecessarily increased. However, it is achieved with high accuracy under the initiative of the node device 70-m.
[0082]
In the present embodiment, the monitoring control channels CSA1 to CSA3 are individually arranged in different virtual containers VC1 to VC3.
However, for these monitoring control channels, the node apparatuses 70a-1 to 70a-3 share a common virtual container to be relayed based on the synchronous multiplexing method, or increase the number of such virtual containers. When the desired information is sent and received in a format that allows identification of the node device and item to be monitored and controlled, for example, as shown in FIG. 7, it is arranged in a common virtual container. Or may be formed as a common channel in a common virtual container.
[0083]
In this embodiment, a single supervisory control channel is individually arranged in the virtual containers VC1 to VC3. However, a plurality of such supervisory control channels may be combined in a desired combination in the virtual containers VC1 to VC3. It may be arranged.
Further, in each of the above-described embodiments, the present invention is applied to the node device arranged at the relay point of the transmission system adapted to the new synchronization method. However, the present invention is not limited to such a new synchronization method. Any transmission system in which a plurality of virtual containers are dynamically arranged in the payload and transmission is performed in units of frames by placing pointers indicating the positions of these virtual containers in known fields. It can also be applied to systems.
[0084]
Further, in each of the above-described embodiments, the present invention is applied to the node device arranged at the relay point of the optical transmission line 90 formed in a ring shape. However, the present invention can be applied to a network having any configuration. It is.
Further, in each of the above-described embodiments, the phase absorption processing unit 94 performs phase difference via the buffer memory only on channels that are allocated in advance to the terminals accommodated in the own station among the channels formed in the specific virtual container. If the transmission delay is tolerated and the hardware scale reduction is achieved at the desired ratio, all the channels formed in that particular virtual container will be routed through the buffer memory. Processing for collecting the phase difference may be performed.
[0085]
【The invention's effect】
As described above, according to the first aspect of the present invention, the hardware size can be reduced and the transmission delay time can be reduced as compared with the conventional example.
According to the second aspect of the present invention, it is possible to flexibly adapt to the configuration of the transmission line, the addition of hardware, the modification, the maintenance and other requirements.
[0086]
Furthermore, in the invention described in claim 3, when a failure occurs in any transmission section, the system is reconfigured with high accuracy.
In the invention according to claim 4, monitoring control of each node device is performed with high accuracy via the transmission line without any change in the hardware to be used for relaying the non-own station dropped virtual container. .
[0087]
Further, in the invention described in claim 5, the hardware configuration is standardized for many node devices arranged in the transmission path, and the process related to the supervisory control is compared with the invention described in claim 4. Can be simplified.
Therefore, in the transmission system to which these inventions are applied, the cost can be reduced and the reliability and transmission quality can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the principle of the invention according to claims 1 to 3;
FIG. 2 is a block diagram showing the principle of the present invention according to claims 4 and 5;
FIG. 3 is a view showing an embodiment corresponding to the first and second aspects of the present invention.
FIG. 4 is a view showing an embodiment corresponding to the invention according to claims 3 to 5.
FIG. 5 is a diagram showing a frame format applied to an embodiment corresponding to the invention as set forth in claim 3;
FIG. 6 is a diagram showing a frame format applied to an embodiment corresponding to the inventions as set forth in claims 4 and 5;
FIG. 7 is a diagram showing another frame format applicable to the embodiment corresponding to the fourth and fifth aspects of the present invention.
FIG. 8 is a diagram illustrating a configuration example of a node device adapted to a new synchronization method.
FIG. 9 is a diagram illustrating a frame format of a new synchronization method.
FIG. 10 is a time chart of signals generated by a frame processing unit.
[Explanation of symbols]
11 Synchronization control means
12 Separation means
13 Self-contained container adapting means
14 Multiplexing means
21 Stationary condition adaptation means
31 Failure handling means
40 transmission line
41,70 node equipment
42 Monitoring and control device
71 Relay processing unit
72 Retiming section
73 Gate circuit
74,77 Phase shifter
75 Receive channel selector
76 Phase difference detector
78 Primary selector
79 Sub-retiming section
80 Timing decoder
81 Secondary selector
82 Transmission channel selector
90 Transmission interface part
91, 91r, 91s optical transmission line
92 Frame processing section
93 Relay processing section
94 Phase Absorption Processing Unit
95 Multiplexer
96 Control unit
97 Timing generator
101 Frame synchronization unit
102 Frame generator
103 Receive buffer processor
104 Transmission buffer processing unit
105, 106 Channel pointer processor (CP)

Claims (5)

In addition to a plurality of virtual containers individually defined as a set of a plurality of channels, a frame including a pointer that individually indicates the arrangement of fields in which these virtual containers are multiplexed, and a frame given from a preceding transmission section; And synchronization control means for extracting these pointers from the frame,
Based on the pointer extracted by the synchronization control means, the own station dropped virtual container including a specific channel pre-assigned to the own station, and the non-own station dropped virtual container including no particular channel Separating means for extracting from the frame;
Among a plurality of channels formed in the own station dropped virtual container extracted by the separating means, the transmission information of the specific channel is accumulated and acquired by adjusting the phase so as to synchronize with the own station. A specific information that includes all or a part of transmission information of a plurality of channels and that has the same format as that of the local lost virtual container and that synchronizes with the non-local lost virtual container extracted by the separating means. A self-contained virtual container adaptation means for generating a virtual container;
Of the virtual containers included in the frame, a non-own-station dropped virtual container separated by the separation means and a specific virtual container generated by the own-station dropped container adaptation means are multiplexed into a single frame. A node device comprising: multiplexing means for transmitting to a subsequent transmission section. The node device according to claim 1,
A node device characterized in that the separation means and the own station dropping container adaptation means comprise station condition adaptation means for instructing a specific channel as station information or information adapted to the station information. In the node device according to claim 1 or 2,
It is determined whether or not the logical value of the transmission information is a predetermined value for an alarm channel individually arranged in a plurality of virtual containers included in a frame given from the preceding transmission section. When the result is true for all the transmission information of these alarm channels, it is provided with a fault processing means for starting the system reconfiguration,
The local container adapting means or multiplexing means is
The value of the alarm channel transmission information formed in a specific virtual container when the result of the determination made by the failure processing means is true for all of the alarm channels individually arranged in the plurality of virtual containers A node device comprising: means for setting the value to the predetermined value. A plurality of node devices described in any one of claims 1 to 3 and individually arranged at a relay point of a transmission path;
A monitoring control device that is arranged in the transmission path and performs monitoring control of these node devices by sending and receiving information related to the monitoring control of the plurality of node devices via the transmission path;
The plurality of node devices are:
Of the multiple virtual containers, one of the virtual containers is allocated as the local station virtual container, and information related to the monitoring control of the local station is transmitted and received via the monitoring control channel formed in the local station virtual container. And
The monitoring and control device includes:
Of the plurality of virtual containers, the local station virtual containers individually assigned to the plurality of node devices are appropriately identified, and the monitoring control channel formed in the identified local station virtual containers is used to transmit the local station virtual containers. A transmission line monitoring system that transmits and receives information related to supervisory control. A plurality of node devices according to any one of claims 1 to 3 and individually arranged at a relay point of a transmission path;
A monitoring control device that is arranged in the transmission path and that performs monitoring control of these node devices by sending and receiving information related to the monitoring control of the plurality of node devices via the transmission path;
The plurality of node devices are:
Sending and receiving information related to the monitoring control of the local station through the monitoring control channel formed in any one of the plurality of virtual containers,
The monitoring and control device includes:
A transmission line monitoring system, wherein information related to the monitoring control is transmitted and received through a monitoring control channel formed in the common virtual container among the plurality of virtual containers.

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