JP5450018B2 - Transmission system - Google Patents

Description

  The present invention relates to a transmission system that performs transmission control.

  In a transmission system, a control card (MCU: Main Control Unit) that performs main control of communication or an interface card (LIU: Line Interface Unit) that accommodates signals and performs communication interface processing in a shelf (shelf). ) Is mounted and signal multiplex transmission is performed (for example, optical signal is accommodated and WDM (Wavelength Division Multiplexing) transmission is performed).

  FIG. 14 is a diagram illustrating a configuration example of a transmission system. The transmission system 5 is provided with a plurality of slots (slots) in the shelf SH1, and a system is constructed by mounting MCUs or LIUs in the slots.

  The LIUs 52-1 to 52-3 are mounted in the slots SL1 to SL3, and the MCU 51 is mounted in the slot SLa (for example, an MCU dedicated slot). The MCU 51 is equipped with a CPU (Central Processing Unit), and each of the LIUs 52-1 to 52-3 itself is also equipped with a CPU in order to improve load distribution and expandability.

  In addition, in order to perform communication between the MCU 51 and the LIUs 52-1 to 52-3, a communication path by an internal LAN (Local Area Network) 5a such as Ethernet (registered trademark) is installed in the shelf SH1.

  Further, the MCU 51 is connected to the OPS 50 through the external LAN 5b in order to communicate with an external management device (OPS: Operation System) 50, and receives a command such as TL1 (Transaction Language 1) transmitted from the OPS 50. The MCU 51 that has received the command transmits the command to the target LIU and controls the entire system.

  Here, when communication is performed between the MCU 51 and the LIUs 52-1 to 52-3, the following conditions are satisfied and communication is performed through the internal LAN 5a. For the following explanation, the shelf number of the shelf SH1 is 01 (shelf no.1), the slot numbers of the slots SL1 to SL3 are 01 to 03 (slot no.1 to 3), and the slot number of the slot SLa is 0A (slot no.A).

  (1) An address (hereinafter referred to as a node ID) for identification is assigned to the LIUs 52-1 to 52-3. The Node ID is assigned by each CPU of the LIUs 52-1 to 52-3.

  For example, the LIU 52-1 mounted in the slot SL1 in the shelf SH1 assigns its own Node ID (01 (shelf number): 01 (slot number)), and the LIU 52- mounted in the slot SL2 in the shelf SH1. 2 assigns its own Node ID as (01:02).

(2) The MCU 51 should recognize the correspondence between the command AID (Access Identifier: Access ID) and the Node IDs of the LIUs 52-1 to 52-3.
For example, it is assumed that ENT-OC3 :: 1-1: C (an optical signal of OC3 (Optical Carrier 3) is registered in the slot SL1 of the shelf SH1) is input from the OPS 50 to the MCU 51 as a command (AID of this command (1-1) corresponds to (shelf number−slot number)).

  The MCU 51 determines the node ID from the AID (1-1), recognizes that the LIU 52-1 installed in the slot SL1 in the shelf SH1 is the target LIU, and transmits a command to the LIU 52-1.

  Note that the Node ID is currently assigned by a rule of 00: 00: 00: 00: <shelf number>: <slot number>. Therefore, the Node ID of the LIU 52-1 of the slot SL1 (slot number = 01) in the shelf SH1 (shelf number = 01) is 00: 00: 00: 00: 01: 01, and the shelf SH1 (shelf number = 01). The node ID of the LIU 52-2 of the slot SL2 (slot number = 02) is 00: 00: 00: 00: 01: 02. The MCU 51 recognizes the Node ID in such a format, and throws the command to the processing target LIU.

  On the other hand, when a message is transmitted from the LIU 52-1 to 52-3 to the MCU 51, the slot number of the slot SLa of the MCU 51 is fixed (= 0A), so the LIUs 52-1 to 52-3 are assigned ID (00: 00: 00: 00: 01: 0A) (hereinafter, the Node ID may be simply expressed as 01:01).

  In the above description, the transmission system including one shelf has been described. However, a plurality of shelves may be connected to form a multi-shelf configuration. FIG. 15 is a diagram illustrating a configuration example of a multishelf transmission system. The transmission system 5-1 includes shelves SH1, SH2, and an OPS 50.

  The internal configuration of the shelf SH1 and the connection relationship with the OPS 50 are the same as those in FIG. The LIUs 52-1 to 52-3 mounted in the slots SL1 to SL3 in the shelf SH1 have Node IDs 01:01, 01:02, and 01:03, respectively, and the MCU 51 mounted in the slot SLa is Has Node ID 01: 0A.

  On the other hand, the shelf SH2 is provided with slots SL11 to SL13 and SL1a, the LIUs 62-1 to 62-3 are mounted in the slots SL11 to SL13, and the MCU 61 is mounted in the slot SL1a. The MCU 61 and the LIUs 62-1 to 62-3 are connected via the internal LAN 5a-1.

  In addition, when the shelf SH2 is added, the shelves SH1 and SH2 are connected to each other by the inter-shelf LAN 5c, so that communication can be performed as if they are in the same LAN even among a plurality of shelves.

  The shelf number of the shelf SH2 is 02 (shelf no.2), the slot numbers of the slots SL11 to SL13 are 01 to 03 (slot no.1 to 3), and the slot number of the slot SL1a is 0A (slot no.A). .

  Accordingly, each of the LIUs 62-1 to 62-3 mounted in the slots SL11 to SL13 sets 02:01, 02:02, and 02:03 as Node IDs, and the MCU 51 mounted in the slot SL1a Set ID 02: 0A to itself.

  FIG. 16 is a diagram showing a connection relationship between different units. The OPS 50 and MCU 51 are connected. Further, the MCU 51 and the LIUs 52-1 to 52-3 in the shelf SH1 are connected, the MCU 51 and the LIUs 62-1 to 62-3 in the shelf SH2 are connected, and the MCU 51 and the MCU 61 are connected.

  Here, since the node ID includes a shelf number, each node ID can be made unique. Therefore, even in the multishelf configuration, it is possible for the MCU 51 of the shelf SH1 to specify which slot number of which shelf should communicate with the LIU.

  For example, the LIU 52-1 in the slot SL1 of the shelf SH1 has a Node ID of 00: 00: 00: 00: 01: 01, and the LIU 62-1 in the slot SL11 of the shelf SH2 is 00: 00: 00: 00: Since it has a Node ID of 02:01, the LIU to be communicated can be specified, and usually there is no conflict.

  When a message is transmitted from the added LIU 62-1 to 62-3 to the MCU 51, since the slot number of the MCU 51 is fixed (= 0A), the LIUs 62-1 to 62-3 are assigned ID (00:00:00). : 00: 01: 0A).

  As a prior art, a technology has been proposed in which a memory for storing individual information of a serial number is mounted in each unit, and a configuration control board monitors the mounting status and individual information of each unit via a bus (patent) Reference 1). In addition, there has been proposed a network device having an IPv6 address assigned to a part of the interface ID in the IPv6 address including a number representing the management system type of the device (Patent Document 2).

Japanese Patent No. 3323006 JP 2007-288234 A

  When constructing a multi-shelf transmission system, it is common to start operation (service in) with a small configuration at the beginning, for example, with one shelf, and add shelves as the traffic increases. It is.

  17 to 19 are diagrams showing a procedure for adding a shelf. FIG. 17 shows the transmission system 5 currently in operation and the shelf SH2 to be added. The configuration of the transmission system 5 is the same as that in FIG. 14, and the configuration of the shelf SH2 is the same as that in FIG.

  The Node ID of the MCU 51 is set to 01: 0A, and the Node IDs of the LIUs 52-1 to 52-3 are set to 01:01, 01:02, and 01:03, respectively. Further, the shelf SH2 to be added is started up independently, and at this time, the Node ID of the MCU 61 is 01: 0A, and the Node IDs of the LIUs 62-1 to 62-3 are 01:01 and 01:02, respectively. , 01:03.

  FIG. 18 shows a connection state when the shelf number is notified from the OPS 50 to the shelf SH2. When the shelf SH2 is added, the shelf SH2 is added while operating the service of the shelf SH1. In this case, first, the MCU 61 of the shelf SH2 is connected to the OPS 50 through the external LAN 5b.

  When the OPS 50 and the MCU 61 are connected, the OPS 50 notifies the shelf SH2 that the shelf number is 02. The MCU 61 sets the shelf number of its own Node ID to 02, and notifies the LIUs 62-1 to 62-3 that the shelf number is 02.

  The LIUs 62-1 to 62-3 that have received the notification from the MCU 61 each set their own Node ID shelf number to 02. Accordingly, the Node ID of the MCU 61 is set to 02: 0A, and the Node IDs of the LIUs 62-1 to 62-3 are set to 02:01, 02:02, and 02:03, respectively.

  FIG. 19 shows a state where expansion of the shelf SH2 is completed. After the node ID of each card in the shelf SH2 is set by the operation of FIG. 18, the MCU 51 and the MCU 61 are connected by the inter-shelf LAN 5c. By such a procedure, the shelf SH2 can be added to the shelf SH1, and a transmission system 5-1 as shown in FIG. 15 can be constructed.

  There is no problem if the procedures of FIGS. However, there is a possibility that an erroneous procedure may occur. In this case, there is a problem that the shelf number is duplicated, and a failure may occur and the communication service of the shelf in operation may be down.

  FIG. 20 is a diagram for explaining the problem. If the same shelf number as that of the shelf SH1 is mistakenly assigned to the shelf SH2 and connected to the shelf SH1 in that state, node IDs are duplicated.

  In this state, for example, the Node ID of the LIU 52-2 installed in the slot SL2 of the shelf SH1 is 01:02, but the Node ID of the LIU 62-2 installed in the slot SL2 of the shelf SH2 is also It becomes 01:02.

  Then, the MCU 51 may misunderstand that the message from the LIU 62-2 in the slot SL12 of the shelf SH2 is transmitted from the LIU 52-2 in the slot SL2 of the shelf SH1, and may erroneously respond to the message to the LIU 52-2. There is.

  At this time, since the LIU 62-2 cannot receive the response signal that should be originally, the LIU 62-2 issues a disconnection alarm. Then, the disconnection alarm is received by the MCUs 51 and 61, the failure recovery program is activated, and there is a possibility that a malfunction occurs in the shelf SH1 that has been operating normally, and the service is down.

  The present invention has been made in view of the above points, and even if there is an erroneous procedure at the time of adding a shelf, the communication service of the shelf currently in operation is not affected, so that the operational efficiency and reliability are improved. It is an object of the present invention to provide an improved transmission system.

  In order to solve the above problems, a transmission system is provided in which a unit is mounted in a slot in a shelf to perform transmission. The transmission system includes a communication control unit that performs communication control, and a plurality of communication interface units that perform communication interface processing by setting address information of the own unit.

Here, the communication interface unit sets its own unique serial number as address information. The communication control unit acquires the serial number from the communication interface unit, and when a message is transmitted from the communication interface unit, the serial number in the address information included in the message is compared with the acquired serial number, If it matches, the message is taken in. If it does not match, it is discarded.

  It becomes possible to improve operational efficiency and reliability.

It is a figure which shows the structural example of a transmission system. It is a figure which shows the structural example of a transmission system. It is a figure which shows the structural example of a transmission system. It is a figure which shows an example of a list. It is a figure which shows a state when adding the shelf to which the incorrect shelf number was provided. It is a figure which shows operation | movement when the shelf to which the shelf number was correctly provided was added. It is a figure which shows an example of a list. It is a figure which shows operation | movement when adding the shelf by which an incorrect shelf number was provided more than one. It is a figure which shows operation | movement when adding the shelf by which an incorrect shelf number was provided more than one. It is a figure which shows an operation | movement sequence. It is a figure which shows an operation | movement sequence. It is a figure which shows an operation | movement sequence. It is a figure which shows an operation | movement sequence. It is a figure which shows the structural example of a transmission system. It is a figure which shows the structural example of the transmission system of a multishelf. It is a figure which shows the connection relation between different units. It is a figure which shows the addition procedure of a shelf. It is a figure which shows the addition procedure of a shelf. It is a figure which shows the addition procedure of a shelf. It is a figure for demonstrating a problem.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a transmission system. The transmission system 1 includes a communication control unit 20 and a plurality of communication interface units 10-1 to 10-n, and each unit is mounted in slots SL1 to SLn and SLa in the shelf SH1 to perform transmission. is there.

  The communication control unit 20 is mounted in the slot SLa and performs communication control. The communication interface units 10-1 to 10-n are mounted in the slots SL1 to SLn, respectively, and autonomously set their own address information to perform communication interface processing.

  Here, the communication interface units 10-1 to 10-n use the unique serial number of the own unit as address information in addition to the shelf number and the slot number indicating the shelf SH1 and the slots SL1 to SLn in which the unit is mounted. Set.

  The communication control unit 20 acquires a serial number from the communication interface units 10-1 to 10-n. When a message is transmitted from the communication interface units 10-1 to 10-n, the serial number in the address information included in the message is compared with the acquired serial number. If it does not match, discard it.

Hereinafter, the communication control unit 20 is referred to as an MCU 20, and the communication interface units 10-1 to 10-n are referred to as LIUs 10-1 to 10-n (in general terms, LIU10).
Next, a specific configuration example of the transmission system 1 will be described. 2 and 3 are diagrams illustrating a configuration example of the transmission system. The transmission system 1-1 includes an LIU 10, an MCU 20, a COM (common) board 30, and an OPS 40.

The MCU 20 includes a control unit 21, a memory unit 22, an L2 (Layer 2) switch 23, an FPGA (Field Programmable Gate Array) 24, and buffers 25-1 to 25-4.
The control unit 21 includes a CPU 21a and a CPLD (Complex Programmable Logic Device) 21b, and the memory unit 22 includes an EEPROM (Electrically Erasable Programmable Read Only Memory) 22a, a flash ROM (Read Only Memory) 22b, and an SDRAM (Synchronous Dynamic Random Access Memory). ) 22c.

  The control unit 21 performs overall control of the system. Further, it receives a command from a user (maintenance person), performs communication between the LIUs and the CPU, and performs read / write control using the hard bus 1d. The memory unit 22 holds the serial number of the MCU 20 and the MAC address. In addition, a list to be described later is also stored in the memory unit 22 (such as the EEPROM 22a).

  The L2 switch 23 is connected to the OPS 40 by the external LAN 1b via the port p1, and is connected to the inter-shelf LAN 1c via the port p2. In addition, the LIU 10 is connected by the internal LAN 1a. The L2 switch 23 performs switching at the Layer 2 level for the internal LAN 1a, the external LAN 1b, and the inter-shelf LAN 1c.

  The port p1 is a LAN port connecting the OPS 40 and the system, and a command is input to the system from the port p1. The port p2 is a LAN port that connects the shelves, and the MCU 20 communicates with MCUs and LIUs of other shelves through the inter-shelf LAN 1c.

  The FPGA 24 controls each LIU to read / write data by the hard bus 1d. The buffers 25-1 to 25-3 are connected to the LIU 10 by the hard bus 1d and perform buffering of transmission / reception data. The buffer 25-4 is connected to the COM board 30 by the hard bus 1d to buffer transmission / reception data.

  The COM board 30 includes an EEPROM 31, a buffer 32, and LEDs (Light Emitting Diodes) 33-1 to 33-3. The EEPROM 31 holds a shelf number and the like. The buffer 32 is connected to the MCU 20 by the hard bus 1d and performs buffering of transmission / reception data. The LEDs 33-1 to 33-3 visualize system failure information and the like, and are turned on / off under the control of the MCU 20.

  The LIU 10 includes a control unit 11, a memory unit 12, an interface unit 13, an FPGA 14, a buffer 15, SFP (Small Form-factor Pluggable) 16-1 and 16-2, a SERDES (Serializer / Deserializer) 17 and a framer 18.

  The control unit 11 includes a CPU 11a and a CPLD 11b, and the memory unit 12 includes an EEPROM 12a, a flash ROM 12b, and an SDRAM 12c. The control unit 11 performs overall control of the LIU 10, receives a request from the MCU 20, and performs hardware control of the LIU 10. The memory unit 12 holds the slot number, serial number, and the like of the LIU 10.

  The interface unit 13 performs communication interface processing in Layer 1 between the MCU 20 and the LIU 10 via the internal LAN 1a. The FPGA 14 controls the other LIU, MCU 20 or COM board 30 to read / write data by the hard bus 1d. The buffer 15 is connected to the MCU 20 by the hard bus 1d and performs buffering of transmission / reception data.

  The SFPs 16-1 and 16-2 are detachable modules that are connected to the optical fibers f1 and f2, respectively, and accommodate 2.5 Gbps optical signals. The SERDES 17 has a serial / parallel conversion function, and extracts / inserts overhead information and the like from transmitted / received optical signals. The framer 18 converts the serial signal into a frame, converts it into, for example, a SONET (Synchronous Optical Network) format, and transmits / receives it to / from other units through a BWB (Back Wired Board).

  Next, the operation of the transmission system 1 will be described in detail. First, each LIU assigns a Node ID including a serial number in addition to the shelf number and slot number when assigning its own Node ID. The serial number is a unique number (for example, a product number) that does not overlap across multiple shelves.

  On the other hand, the MCU 20 and the LIU 10 are connected by a hard bus 1d, and data R / W can be mutually performed by the hard bus 1d. For example, the CPU 21a in the MCU 20 can directly write or read data in a register (for example, the EEPROM 12a) in the LIU 10 via the hard bus 1d. The MCU 20 acquires the serial number of each LIU by using the hard bus 1d (without performing communication between the CPU 21a of the MCU 20 and the CPU 11a of the LIU 10), and creates a list.

  In this way, since the MCU 20 can access the LIU 10 using the hard bus 1d, the MCU 20 can acquire the Node ID from the LIU 10 without blocking the communication between the CPUs of both the MCU 20 and the LIU 10.

  FIG. 4 shows an example of the list. The serial numbers of the LIUs 10-1 to 10-3 are AAAA, BBBB, and CCCC. When the MCU 20 reads the serial number = AAAA from the register of the LIU 10-1, the MCU 20 writes AAAA in the serial number column corresponding to the slot number = 01 in the list L1 of the shelf number = 01.

  When serial number = BBBB is read from the register of LIU 10-2, BBBB is written in the serial number column corresponding to slot number = 02 in list L1 with shelf number = 01.

  Similarly, when the serial number = CCCC is read from the register of the LIU 10-3, the CCCC is written in the serial number column corresponding to the slot number = 03 in the list L1 of the shelf number = 01. In this way, a list L1 with shelf number = 01 is created.

  Next, serial number comparison / collation processing will be described. After the list is created, when the MCU 20 receives a message from each LIU, the serial number included in the node ID set in the message is compared with the serial number registered in the list. If they match, the corresponding message is fetched.

  For example, consider a case where a message is transmitted from the LIU 10-1 mounted in the slot SL1 in the shelf SH1, and the MCU 20 receives this message. Since the serial number of the LIU 10-1 is AAAA, the control unit 11 of the LIU 10-1 uses 00: 00: AA: AA: 01: 01 as its Node ID including the serial number, shelf number, and slot number. A message including this Node ID is set and transmitted to the MCU 20.

  On the other hand, the MCU 20 reads the serial number (AAAA) of the LIU 10-1 using the hard bus 1d (the MCU 20 has only known the serial number because shelf number = 01 and slot number = 01 are known). , Register the serial number in the list. Specifically, AAAA is registered in the serial number column corresponding to slot number = 01 in list L1 for list L1 with shelf number = 01.

  When the MCU 20 receives the message transmitted from the LIU 10-1, the MCU 20 detects (serial number, shelf number, slot number) in the Node ID set in the message.

  Then, the list L1 is searched, and the serial number in the node ID of the transmission message is compared with the serial number registered in the list L1. If the serial numbers match, it is determined that the message is valid from the LIU 10-1, and if it does not match, it is discarded as an invalid message.

  Here, since Node ID = 00: 00: AA: AA: 01: 01, it is found that the shelf number is 01, and the list L1 with shelf number = 01 is selected. Further, since it is also known from the node ID that slot number = 01, the slot number = 01 of the selected list L1 is searched.

  AAAA is registered in the serial number column corresponding to the slot number = 01 in the list L1 of the shelf number = 01. The registered serial number (AAAA) and the serial number in the node ID of the transmission message are registered. (AAAA) matches. Accordingly, the MCU 20 recognizes that the received message is a valid message transmitted from the LIU 10-1, and performs capture.

  Next, the operation in the case where the service of the operation shelf is not affected even when a shelf with an incorrect shelf number is added will be described. FIG. 5 is a diagram showing a state when a shelf with an incorrect shelf number is added.

  The shelf SH1 has slots SL1 to SL3 and SLa, the LIUs 10-1 to 10-3 are mounted in the slots SL1 to SL3, and the MCU 20 is mounted in the slot SLa. The Node ID of the MCU 20 is 01: 0A, and the Node IDs of the LIUs 10-1 to 10-3 are set as AAAA: 01: 01, BBBB: 01: 02, and CCCC: 01: 03.

  Here, the shelf SH2 with the same shelf number = 1 (shelf no.1) is erroneously assigned to the shelf SH1 that is currently in operation with the shelf number = 1 (shelf no.1). It is assumed that the connection is increased by connecting to SH1 (the shelves SH1 and SH2 are connected in the inter-shelf LAN 1c).

  The expansion shelf SH2 has slots SL11 to SL13 and SL1a, the LIUs 10a-1 to 10a-3 are mounted in the slots SL11 to SL13, and the MCU 20a is mounted in the slot SL1a. Further, the Node ID of the MCU 20a is 01: 0A, and the Node IDs of the LIUs 10a-1 to 10a-3 are erroneously set as DDDD: 01: 01, EEEE: 01: 02, and FFFF: 01: 03. (Originally, the shelf number = 02.)

  In such a state, it is assumed that the MCU 20 receives a message from the LIU 10-2 mounted in the slot SL2 in the shelf SH1. At this time, it is assumed that a message is transmitted from the LIU 10-2 to the MCU 20, and a message is also transmitted from the LIU 10a-2 mounted in the slot SL2 in the shelf SH2 toward the MCU 20.

The LIU 10-2 transmits a message including BBBB: 01: 02 as the Node ID, and the LIU 10a-2 transmits a message including EEEE: 01: 02 as the Node ID.
The MCU 20 reads on the hard bus 1d that the serial number of the LIU 10-2 with the shelf number = 01 and the slot number = 01 is BBBB, and registers it in advance on the list L1, and the shelf number = 01 and the slot number = From the LIU of 01, it is recognized that a message having the serial number = BBBB may be received.

  Therefore, even if a message is transmitted from the LIU 10a-2 with the slot number = 01 of the shelf SH2 to which the same shelf number is erroneously assigned, the serial number of the message is EEEE, and therefore, it is a valid message to be received. The transmission message from the LIU 10a-2 is discarded and no malfunction occurs.

  As described above, the MCU 20 transmits two messages having different serial numbers from the LIUs 10-2 and 10a-2 mounted on the shelf number = 01 and the slot number = 02, and receives the messages. Suppose that

  Such a situation means that a shelf with an incorrect shelf number = 01 is connected in addition to the shelf SH1 with the shelf number = 01 as viewed from the MCU 20 of the upper shelf SH1.

  Therefore, the MCU 20 transmits a failure signal indicating that the shelf number is duplicated to the OPS 40. When the OPS 40 receives the failure signal, the OPS 40 issues an alarm and indicates that a shelf having an incorrect shelf number is added. Notify maintenance personnel.

  Next, an operation when a shelf with a correctly assigned shelf number is added will be described. FIG. 6 is a diagram showing an operation when a shelf with a correctly assigned shelf number is added. Assume that the shelf SH2 with shelf number = 02 is connected to the shelf SH1 and added via the inter-shelf LAN 1c.

  In this case, the MCU 20a of the lower shelf SH2 recognizes that it is a Tributary Shelf (extension shelf), reads the serial number of each LIU in the shelf SH2 by the hard bus 1d, creates a list, The corresponding list (list related to the shelf SH2) is notified to the MCU 20 of SH1.

  FIG. 7 shows an example of the list. The list L2 is a list created by the MCU 20a of the shelf SH2. The list L2 also includes the serial number (XXXX) of the MCU 20a itself.

  As a result, the MCU 20 shares information between the list L1 of the shelf SH1 and the list L2 of the shelf SH2, so that the MCU 20 can recognize and receive the serial numbers of all the units in the multishelf. It is possible to check the validity of the message by checking which slot of which shelf the message came from and checking the serial number in the list.

  Next, the operation when a plurality of shelves with an incorrect shelf number are added will be described. FIG. 8 and FIG. 9 are diagrams showing the operation when a plurality of shelves with incorrect shelf numbers are added. Consider a case where two Tributary Shelfs with shelf number = 02 are connected by mistake.

  At this time, the MCU 20 of the shelf SH1 receives two lists with the shelf number = 02. However, the MCU 20 can check the “MCU serial number” in the list and recognize that the list of the same shelf number has been transmitted from the MCU in the Tributary Shelf having a different serial number. Thereby, it is possible to detect the duplication of the shelf number and prompt the alarm to be issued.

  For example, the MCU 20a of the shelf SH2 with the shelf number = 02 has the serial number = XXXX, and this is recognized by the MCU 20 of the shelf SH1. Sent to).

  In this state, it is assumed that shelf number = 02 is erroneously set in the shelf SH3 mounted on the MCU 20b having the serial number = YYYY and is connected to the shelves SH1, SH2.

  In this case, the MCU 20 of the shelf SH1 first receives the list (list L2) from the MCU 20a having the serial number = XXXX, and then receives the list from the MCU 20b having the serial number = YYYY.

  The two lists have the same shelf number = 02. In the MCU 10, when two lists having the same shelf number are transmitted, the list transmitted later is invalidated and discarded.

  Further, the MCU 20 transmits a failure signal indicating that the shelf number is duplicated to the OPS 40. When the OPS 40 receives the failure signal, an alarm is issued and a shelf having an incorrect shelf number is added. To the maintenance personnel.

  As described above, even if a multi-shelf is built with shelves having the same shelf number by mistake, whether the message is a legitimate message in the currently operating shelf or an illegal message due to an added shelf with an incorrect shelf number. This makes it possible to discriminate and suppress the occurrence of a system failure.

Next, the operation of the transmission system 1 will be described using a sequence diagram. 10 to 13 are diagrams showing an operation sequence.
[S1] The LIU 10-2 (control unit 11) mounted in the slot SL2 of the shelf SH1 acquires the shelf number stored in the EEPROM 31 of the COM board 30 via the hard bus 1d.

[S2] The LIU 10-2 obtains the slot number in which it is stored, which is stored in the EEPROM 12a.
[S3] The LIU 10-2 obtains its serial number stored in the EEPROM 12a.

  [S4] The LIU 10-2 determines its node ID from the shelf number, slot number, and serial number. Assume that the node ID = BBBB: 01: 02 is determined assuming that the shelf number = 01, the slot number = 02, and the serial number = BBBB.

  [S5] The MCU 20 (control unit 21) of the shelf SH1 acquires the serial number = BBBB from the EEPROM 12a of the LIU 10-2 mounted in the slot SL2 via the hard bus 1d.

  [S6] The MCU 20 performs the same read processing as that in step S5 for other LIUs, and registers the serial numbers read from the LIUs mounted in the slots to create a list.

  [S7] The LIU 10-2 that has detected a failure (for example, a disconnection of an optical signal) notifies the MCU 20 of this failure through the internal LAN 1a. At this time, the destination is the Node ID (01: 0A) of the MCU 20, and the transmission source Node ID is (BBBB: 01: 02).

  [S8] Upon receiving the failure notification, the MCU 20 collates the transmission source Node ID of the failure notification with the registered contents of the list. From the source node ID, it can be seen that the serial number of slot SL2 is transmitted from the LIU of BBBB, and it is verified whether BBBB is registered in the serial number corresponding to slot number = 02 in the list. If it is determined that the message is a valid message, the process proceeds to step S9. If it is not a valid message, the message is discarded.

  [S9] Since the serial numbers match, it is recognized as a valid message and the processing is continued. Further, in this case, failure information that an optical signal interruption has occurred in the slot SL2 is notified to the OPS 40 through the external LAN 1b. When receiving the failure information, the OPS 40 issues a failure alarm to the maintenance person.

  [S10] The LIU 10a-2 (control unit 11) mounted in the slot SL12 of the shelf SH2 (extension shelf) acquires the shelf number stored in the EEPROM 31 of the COM board 30 via the hard bus 1d. (Assuming that shelf number = 01 could be read).

[S11] The LIU 10a-2 acquires the slot number in which it is stored, which is stored in the EEPROM 12a.
[S12] The LIU 10a-2 acquires its own serial number stored in the EEPROM 12a.

  [S13] The LIU 10a-2 determines its node ID from the shelf number, slot number, and serial number. It is assumed that Node ID = EEEE: 01: 02 is determined assuming that shelf number = 01, slot number = 02, and serial number = EEEE.

[S14] The shelf SH2 assigned in duplicate with the shelf number = 01 is connected to the shelf SH1 through the inter-shelf LAN 1c.
[S15] The LIU 10a-2 that has detected a failure (for example, optical signal interruption) notifies the MCU 20 of the shelf SH1 of this failure through the internal LAN 1a. At this time, the destination is the Node ID (01: 0A) of the MCU 20, and the transmission source Node ID is (EEEE: 01: 02).

  [S16] Upon receiving the failure notification, the MCU 20 (control unit 21) collates the transmission source Node ID of the failure notification with the registered contents of the list. From the source node ID, it can be seen that the serial number of the slot SL2 is transmitted from the LIU of the EEEE, and it is verified whether the EEEE is registered in the serial number corresponding to the slot number = 02 in the list. The serial number read from slot number = 02 is BBBB, and since it is different from the serial number = EEEE of the received node ID, it is determined as an invalid message and discarded.

[S17] The MCU 20 sends a failure signal indicating that “the shelf number is duplicated” to the OPS 40 together with the message discard.
[S17a] The OPS 40 sets the shelf number = 02 for the MCU 20a of the expansion shelf SH2, and the shelf number = 02 is also stored in the EEPROM 31 of the COM panel 30 of the shelf SH2.

  [S18] The LIU 10a-2 of the shelf SH2 acquires the shelf number stored in the EEPROM 31 of the COM board 30 via the hard bus 1d (reads the correct shelf number = 02).

[S19] The LIU 10a-2 acquires the slot number in which it is stored, which is stored in the EEPROM 12a.
[S20] The LIU 10a-2 acquires its serial number stored in the EEPROM 12a.

  [S21] The LIU 10a-2 determines its Node ID from the shelf number, slot number, and serial number. Since shelf number = 02, slot number = 02, and serial number = EEEE, it is determined that Node ID = EEEE: 02: 02.

  [S22] The MCU 20a of the shelf SH2 acquires the serial number (EEEE: 02: 02) from the EEPROM 12a of the LIU 10a-2 mounted in the slot SL2 via the hard bus 1d.

  [S23] The MCU 20a performs the same reading process as in step S22 on the other LIUs in the shelf SH2, and registers the serial numbers read from the LIUs of the slots to create a list.

  At this time, it recognizes that the shelf number = 02, and adds the serial number of the MCU itself to the list. The list thus created (addition list) is transferred to the MCU 20 (Node ID is fixed to 01: 0A) of the shelf SH1.

[S24] The MCU 20 of the shelf SH1 adds the additional list transmitted from the shelf SH2, which is a Tributary Shelf, to the list of existing lists.
[S25] When two or more TribShelf having the same shelf number (shelf number = 02) are connected, the MCU 20 of the shelf SH1 receives the list of the shelf number = 02 twice. At this time, the MCU 20 of the shelf SH1 checks the serial number of the MCU registered in the list.

  If the serial numbers are different, it is determined that “two MCUs with different serial numbers bear the same shelf number”, discards the subsequent list, and gives a fault signal indicating that the shelf number is duplicated. put out. If not, go to step S25a.

[S25a] The MCU 20 acquires an additional list of the shelf SH2 and puts it in a list.
[S26] The LIU 10a-2 of the shelf SH2 that has detected the failure (for example, the interruption of the optical signal) notifies the MCU 20 of this failure through the internal LAN 1a. At this time, the destination is the Node ID (01: 0A) of the MCU 20, and the transmission source Node ID is (EEEE: 02: 02).

  [S27] Upon receiving the failure notification, the MCU 20 collates the transmission source Node ID of the failure notification with the registered contents of the list. From the source node ID, it can be seen that the serial number of the slot SL2 is transmitted from the LIU of the EEEE, and it is verified whether the EEEE is registered in the serial number corresponding to the slot number = 02 in the list. If the result of the collation is a valid message, the process proceeds to step S28, and if it is not a valid message, it is discarded.

  [S28] Since the serial numbers match, it is recognized that the message is valid and the processing is continued. Also, the failure information that the optical signal is interrupted in the slot SL2 is notified to the OPS 40 through the external LAN 1b. When receiving the failure information, the OPS 40 issues a failure alarm to the maintenance person.

  As described above, according to the transmission system 1, the LIUs 10-1 to 10-n set the unique serial number of the own unit as address information in addition to the shelf number and the slot number. Also, the MCU 20 acquires the serial number from the LIUs 10-1 to 10-n, and when a message is transmitted from the LIUs 10-1 to 10-n, the serial number in the address information included in the message and the acquired number The serial number is compared, and if they match, a message is fetched, and if they do not match, they are discarded.

  As a result, even if the shelf number is duplicated due to a procedure error, the communication service can be continued without affecting the currently operating shelf, and an alarm is issued to notify that the shelf number is duplicated. As a result, it is possible to improve operational efficiency and reliability.

  Furthermore, since the functions of the transmission system 1 can be configured by software design using existing hardware in the system, no special hardware modification is required, and an effect can be obtained while suppressing an increase in cost. It is.

(Supplementary note 1) In a transmission system in which a unit is mounted in a slot in a shelf and performs transmission,
A communication control unit for performing communication control;
Set the address information of its own unit, and multiple communication interface units that perform communication interface processing,
With
The communication interface unit sets the unique serial number of the unit as the address information in addition to the shelf number and the slot number indicating the shelf and the slot in which the unit is mounted,
The communication control unit acquires the serial number from the communication interface unit, and when a message is transmitted from the communication interface unit, the serial number in the address information included in the message, and the acquired Compare with the serial number, if it matches, capture the message, if it does not match, discard it,
A transmission system characterized by that.

(Supplementary Note 2) The communication control unit and the communication interface unit are both provided with a CPU, and are connected by both an internal LAN for performing inter-CPU communication and a hard bus accessible to each other without performing inter-CPU communication. ,
The communication control unit obtains the serial number of the communication interface unit through the hard bus;
The transmission system according to supplementary note 1, wherein:

(Supplementary Note 3) The communication control unit is
A list for registering the serial number for each slot number is created for each shelf, and the acquired serial number is registered in the list,
When the message is received, the corresponding list is selected from the shelf number in the address information included in the message, and the serial number registered in the corresponding list is selected from the slot number in the address information. And compare the searched serial number with the serial number in the message.
The transmission system according to supplementary note 1, wherein:

(Supplementary Note 4) When a multi-shelf is configured by connecting an expansion shelf to the operation shelf and adding a shelf to the operation shelf that is currently in operation,
The expansion shelf includes an expansion communication control unit having the same function as the communication control unit, and an expansion communication interface unit having the same function as the communication interface unit.
The extension communication control unit creates an additional list in which the serial number acquired from the extension communication interface unit and its serial number are registered, and transmits the list to the communication control unit in the operation shelf. ,
The communication control unit includes the serial number of the communication interface unit registered in the list relating to the operation shelf, and the communication control unit for expansion and the communication interface unit for expansion registered in the additional list, respectively. Identifying each unit mounted in the multishelf based on the serial number;
The transmission system according to supplementary note 1, wherein:

(Appendix 5) The communication control unit is
When the plurality of messages are received, when the shelf number and the slot number in the address information included in the plurality of messages are the same and the serial numbers are different,
Recognizing that the expansion shelf assigned the same shelf number as the operational shelf is connected to the operational shelf,
Discarding the message with the serial number registered in the additional list and outputting a failure signal indicating that the shelf number is duplicated;
The transmission system according to supplementary note 4, wherein

(Supplementary Note 6) The communication control unit is
When the additional list transmitted from each of the plurality of expansion shelves is received, the shelf number of the additional list is different from the shelf number of the operational shelf, but the shelf number of the additional list Are all the same,
The messages transmitted from other expansion shelves other than the expansion shelves first connected to the operation shelf are discarded, and a fault signal indicating that the shelf number is duplicated is output.
The transmission system according to supplementary note 4, wherein

(Supplementary Note 7) In the communication control unit that communicates with the communication interface unit mounted on the shelf,
A control unit that performs communication control;
A memory unit that registers and holds a serial number assigned to the communication interface unit in a list;
With
The communication interface unit sets the unique serial number of the unit as address information in addition to the shelf number and slot number indicating the shelf and slot in which the unit is mounted,
The control unit acquires the serial number from the communication interface unit, and when a message is transmitted from the communication interface unit, the serial number in the address information included in the message and the acquired serial number Compare the numbers and fetch the message if they match, discard them if they do not match,
A communication control unit.

(Supplementary Note 8) The communication control unit and the communication interface unit are both provided with a CPU, and are connected by both an internal LAN for performing inter-CPU communication and a hard bus accessible to each other without performing inter-CPU communication. ,
The control unit obtains the serial number of the communication interface unit through the hard bus.
The communication control unit according to appendix 7, wherein

(Supplementary note 9)
When the message is received, the corresponding list is selected from the shelf number in the address information included in the message, and the serial number registered in the corresponding list is selected from the slot number in the address information. And compare the searched serial number with the serial number in the message.
The communication control unit according to appendix 7, wherein

(Supplementary Note 10) When a multi-shelf is configured by connecting an expansion shelf to the operation shelf and expanding the shelf to the operation shelf that is currently in operation,
The expansion shelf includes an expansion communication control unit having the same function as the communication control unit, and an expansion communication interface unit having the same function as the communication interface unit.
The extension communication control unit creates an additional list in which the serial number acquired from the extension communication interface unit and its serial number are registered, and transmits the list to the communication control unit in the operation shelf. ,
The control unit in the communication control unit includes the serial number of the communication interface unit registered in the list relating to the operation shelf, the additional communication control unit and the additional communication registered in the additional list. Identifying each unit mounted in the multishelf based on the serial number of each interface unit;
The communication control unit according to appendix 7, wherein

(Supplementary Note 11) The control unit
When the plurality of messages are received, when the shelf number and the slot number in the address information included in the plurality of messages are the same and the serial numbers are different,
Recognizing that the expansion shelf assigned the same shelf number as the operational shelf is connected to the operational shelf,
Discarding the message with the serial number registered in the additional list and outputting a failure signal indicating that the shelf number is duplicated;
The communication control unit according to supplementary note 10, characterized by that.

(Supplementary Note 12) The control unit
When the additional list transmitted from each of the plurality of expansion shelves is received, the shelf number of the additional list is different from the shelf number of the operational shelf, but the shelf number of the additional list Are all the same,
The messages transmitted from other expansion shelves other than the expansion shelves first connected to the operation shelf are discarded, and a fault signal indicating that the shelf number is duplicated is output.
The communication control unit according to supplementary note 10, characterized by that.

DESCRIPTION OF SYMBOLS 1 Transmission system 10-1 to 10-n Communication interface unit 20 Communication control unit SH1 Shelf SL1 to SLn, SLa slot

Claims (7)

In a transmission system in which a unit is mounted in a slot in a shelf and performs transmission,
A communication control unit for performing communication control;
Set the address information of its own unit, and multiple communication interface units that perform communication interface processing,
With
The communication interface unit sets a unique serial number of its own unit as the address information,
The communication control unit acquires the serial number from the communication interface unit, and when a message is transmitted from the communication interface unit, the serial number in the address information included in the message, and the acquired Compare with the serial number, if it matches, capture the message, if it does not match, discard it,
A transmission system characterized by that. The communication control unit and the communication interface unit are both equipped with a CPU, and are connected by both an internal LAN for performing inter-CPU communication and a hard bus accessible to each other without performing inter-CPU communication,
The communication control unit obtains the serial number of the communication interface unit through the hard bus;
The transmission system according to claim 1. In addition to the serial number, the communication interface unit sets a shelf number and a slot number indicating the shelf and the slot in which the unit is mounted in the address information,
The communication control unit includes:
A list for registering the serial number for each slot number is created for each shelf, and the acquired serial number is registered in the list,
When the message is received, the corresponding list is selected from the shelf number in the address information included in the message, and the serial number registered in the corresponding list is selected from the slot number in the address information. And compare the searched serial number with the serial number in the message.
The transmission system according to claim 1. When a multi-shelf is configured by connecting an expansion shelf to the operation shelf and expanding the shelf to the operation shelf that is currently in operation,
The expansion shelf includes an expansion communication control unit having the same function as the communication control unit, and an expansion communication interface unit having the same function as the communication interface unit.
The extension communication control unit creates an additional list in which the serial number acquired from the extension communication interface unit and its serial number are registered, and transmits the list to the communication control unit in the operation shelf. ,
The communication control unit includes the serial number of the communication interface unit registered in the list relating to the operation shelf, and the communication control unit for expansion and the communication interface unit for expansion registered in the additional list, respectively. Identifying each unit mounted in the multishelf based on the serial number;
The transmission system according to claim 3 . The communication control unit includes:
When the plurality of messages are received, when the shelf number and the slot number in the address information included in the plurality of messages are the same and the serial numbers are different,
Recognizing that the expansion shelf assigned the same shelf number as the operational shelf is connected to the operational shelf,
Discarding the message with the serial number registered in the additional list and outputting a failure signal indicating that the shelf number is duplicated;
The transmission system according to claim 4. The communication control unit includes:
When the additional list transmitted from each of the plurality of expansion shelves is received, the shelf number of the additional list is different from the shelf number of the operational shelf, but the shelf number of the additional list Are all the same,
The messages transmitted from other expansion shelves other than the expansion shelves first connected to the operation shelf are discarded, and a fault signal indicating that the shelf number is duplicated is output.
The transmission system according to claim 4. In the communication control unit that communicates with the communication interface unit mounted on the shelf,
A control unit that performs communication control;
A memory unit that registers and holds a serial number assigned to the communication interface unit in a list;
With
The communication interface unit sets its own unique serial number as address information,
The control unit acquires the serial number from the communication interface unit, and when a message is transmitted from the communication interface unit, the serial number in the address information included in the message and the acquired serial number Compare the numbers and fetch the message if they match, discard them if they do not match,
A communication control unit.

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