WO1999051004A1 - Transmitter having redundancy switching function and method for controlling the same - Google Patents
Transmitter having redundancy switching function and method for controlling the same Download PDFInfo
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- WO1999051004A1 WO1999051004A1 PCT/JP1999/001604 JP9901604W WO9951004A1 WO 1999051004 A1 WO1999051004 A1 WO 1999051004A1 JP 9901604 W JP9901604 W JP 9901604W WO 9951004 A1 WO9951004 A1 WO 9951004A1
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- 230000006870 function Effects 0.000 claims abstract description 202
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- 230000004044 response Effects 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 199
- 238000004891 communication Methods 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 21
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 230000007717 exclusion Effects 0.000 claims description 4
- 238000007726 management method Methods 0.000 description 50
- 238000010586 diagram Methods 0.000 description 22
- 239000000835 fiber Substances 0.000 description 15
- 230000005856 abnormality Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
- G06F11/1417—Boot up procedures
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0057—Operations, administration and maintenance [OAM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0057—Operations, administration and maintenance [OAM]
- H04J2203/006—Fault tolerance and recovery
Definitions
- Transmission device having a redundancy switching function and control method therefor
- the present invention relates to a transmission device used in an information communication system conforming to, for example, Synchronous Digital Hierarchy (SDH) and a start-up control method thereof.
- SDH Synchronous Digital Hierarchy
- An example of an information communication system that constitutes a ring network conforming to the Synchronous Digital Hierarchy (SDH) is one in which a plurality of nodes including transmission devices are connected in a ring via a high-speed line. is there.
- the information communication system using the above-mentioned SDH system has various characteristic functions by utilizing the huge bandwidth, and among them, there is a function called APS (Automatic Protection Switch). This is specified in ITU-T Recommendations G.841 and G.783, and enables switching on a per-session basis in the event of a failure in a relay or transmission medium in a transmission system. Is what you do.
- the control unit of the transmission device is provided with a plurality of redundancy switching functions (high-speed line redundancy switching function, intra-device redundancy switching function, low-speed line redundancy switching function, etc.) to realize APS.
- an object of the present invention is to provide a transmission apparatus capable of recovering service traffic without once switching back even if software reset is performed while a plurality of switching functions are activated. And a control method therefor.
- Another object of the present invention is to arbitrate data deployment processing of a plurality of redundant switching functions and to maintain the switching state without conflict in resetting the switching state of the plurality of redundant switching functions.
- An object of the present invention is to provide a transmission device and a control method thereof, which are capable of performing start-up processing of held software.
- a plurality of redundant switching functions are provided.
- a step of arbitrating backup data expansion processing by the plurality of redundant switching functions during a software start-up sequence a step of arbitrating backup data expansion processing by the plurality of redundant switching functions during a software start-up sequence; and
- a software start-up method which includes a step of confirming that the backup data deployment processing by the switching function has been completed, and issuing an operation instruction to each of the plurality of redundant switching functions.
- a method for starting the plurality of redundant switching functions during a software startup sequence is provided.
- the step of instructing the initialization processing in a predetermined order for each of the plurality of redundancy switching functions, and the initialization processing completion notification from all of the plurality of redundancy switching functions In response to the step of instructing the backup data expansion processing in the order of the backup data and the notification of the completion of the backup data expansion processing from all of the plurality of redundant switching functions, each of the plurality of redundant switching functions is performed. And a step of performing operation instructions in the predetermined order.
- each of the plurality of redundant switching functions is a backup data.
- a step for passing the control data generated from the redundant control function to the hardware control function, and the hardware control function performs exclusion between the plurality of redundant switching functions to obtain a match, thereby controlling the control state of each redundant switching function.
- each of the plurality of redundant switching functions has a control state other than its own control state. Backing up the control state including the control state of the other redundant switching function, and setting the other redundant switching function so that each of the plurality of redundant switching functions backs up to its own control state. And a step of generating a control data reflecting the above control state and expanding the corresponding control state to hardware.
- a communication device for data transmission including at least two first and second transmission devices in which the frequency and the phase of a clock signal are synchronized.
- An operation state determination unit that determines whether the second transmission apparatus is in an operation state of transmitting a transmission signal when starting up a clock system of the first transmission apparatus; and wherein the second transmission apparatus operates. When it is determined that the clock is in the state, the clock system of the first transmission device is started up in accordance with the clock data recorded in the predetermined backup data recording means.
- a communication device for data transmission including a start-up unit.
- a communication device for data transmission including at least two first and second transmission devices in which the frequency and the phase of a clock signal are synchronized.
- a control method for a communication device for data transmission comprising: a fourth step of controlling a clock of the second transmission device so as to match a lock.
- FIG. 1 is a diagram showing an overall configuration of an information communication system to which a transmission device according to a first embodiment of the present invention is applied.
- FIG. 2 is a diagram showing a configuration of a F FRN (Four Fiber Ring Node).
- FIG. 3 is a diagram for explaining the redundancy of the transmission device constituting the node.
- FIG. 4 is a diagram for explaining span switching in HSAPS.
- FIG. 5 is a diagram for explaining ring switching in HSAPS.
- FIG. 6 is a diagram showing a configuration of the transmission device according to the first embodiment of the present invention.
- FIG. 7 is a diagram for explaining the intra-device redundancy switching.
- FIG. 8 is a diagram showing a startup sequence according to the first embodiment of the present invention.
- FIG. 9 is a front view illustrating a processing procedure performed by the startup sequence management unit.
- FIG. 10 is a flowchart showing a processing procedure by each redundancy switching function.
- FIG. 11 is a diagram for explaining a virtual main signal switch memory space according to the second embodiment of the present invention.
- FIG. 12 is a flowchart showing a processing procedure by the control module according to the second embodiment of the present invention.
- FIG. 13 is a diagram for explaining the processing during the startup sequence.
- FIG. 14 is a diagram for explaining the processing after the completion of the backup data overnight deployment.
- FIG. 15 is a diagram showing a sequence according to the third embodiment of the present invention.
- FIG. 16 is a flowchart showing an operation in the third embodiment of the present invention.
- FIG. 17 is a diagram showing a sequence in the fourth embodiment of the present invention.
- FIG. 18 is a front view illustrating an operation according to the fourth exemplary embodiment of the present invention.
- FIG. 19 is a circuit configuration diagram for explaining a circuit configuration according to the fifth embodiment of the present invention.
- FIG. 2OA and FIG. 20B show a fifth embodiment of the present invention. It is a figure for explaining operation.
- FIG. 21A and FIG. 21B are diagrams for explaining the operation according to the fifth embodiment of the present invention.
- FIG. 22 is a flowchart for explaining the operation according to the fifth embodiment of the present invention.
- FIG. 23 is a flowchart for explaining the operation according to the fifth embodiment of the present invention.
- FIG. 24 is a flowchart for explaining the operation according to the fifth embodiment of the present invention.
- FIG. 25 is a flowchart for explaining the operation according to the fifth embodiment of the present invention.
- FIG. 1 is a diagram showing an overall configuration of an information communication system to which a transmission device according to a first embodiment of the present invention is applied.
- a ring network conforming to the Synchronous Digital Hierarchy (SDH) is configured, and m nodes (including transmission devices) Nl to Nm are ringed via a high-speed line FL. It is connected in a shape.
- SDH Synchronous Digital Hierarchy
- the above-mentioned SDH is based on an optical transmission system, and has various characteristic functions by utilizing its huge bandwidth. Among them, there is a function called APS (Automatic Protection Switch). This is specified in ITU-T recommendation G.841 ⁇ 0.783, It implements switching on a per-session basis in the event of a failure in a transmission system repeater or transmission medium.
- each fiber is connected by four fibers, each of which is a fiber for use in the spare (spare system), and each node forms a Four Fiber Ring Node (FFRN).
- FFRN Four Fiber Ring Node
- each node is connected to a plurality of transmission devices A 1 and A 2 in parallel via a demultiplexing unit as shown in FIG. It is often connected to a transmission line, and each transmission device shares various signal processing such as line setting. For this reason, the transmission devices A l and A 2 operate in a state where frame synchronization is established.
- the service traffic fiber optics and the protection traffic fiber optics are time-division multiplexed high-speed lines for digital signal transmission, each having a frame configuration standardized by SDH. For example, it is composed of STM-16 standardized by SDH.
- information of an arbitrary channel is transmitted by a low-speed line (for example, STM-1 standardized by SDH, etc.) in each of the transmission devices of the nodes N1 to Nm. ) Dropped by SL and sent to communication device C such as exchange.
- a low-speed line for example, STM-1 standardized by SDH, etc.
- the normal state In a ring network system with such a configuration, no failure detection or switching by external commands is performed at all.
- the normal state (hereinafter referred to as the normal state), the transmission between the nodes is transmitted via the fiber for service traffic.
- Each node constantly monitors the transmission status of both the service traffic fiber and the protection traffic fiber.
- both the fiber for service traffic and the fiber for protection traffic have failures. If this occurs, the transmission path is switched to a fiber for protection traffic on a transmission path different from the existing communication path, and transmission is continued (ring switching). That is, in this case, the communication path is switched to the node N2 to the node N1 to the node Nm to the node N3.
- This ring switching can also be forcibly switched by an external command from a control device or the like (not shown), similarly to the span switching.
- FIG. 6 is a diagram showing a main configuration of a transmission device provided in each of the nodes Nl to Nm.
- Each transmission device A 1 is provided with an add-drop multiplexer (A DM) 1 and synchronous transmission data transmitted via high-speed line FL interface (IZF) 2 —:! Introduce to the add 'drop' multiplexer (ADM) 1 via ⁇ 2-4, and then drop to the low-speed line SL side via the interface (IZF) 3. In addition, the synchronous transmission data input from the low-speed line SL is introduced into an add-drop multiplexer (ADM) 1 via the interface section 3 and multiplexed on the high-speed line FL.
- ADM add-drop multiplexer
- the operation control for the add-drop multiplexer (ADM) 1 is controlled by the interface (I / F) 2 — :! 2 to 4 are performed by the control unit 4 based on the information given from 4.
- the control unit 4 is realized as, for example, a micro computer, and controls the entire apparatus.
- the control unit 4 has the above-mentioned APS function and performs control related to various types of redundancy switching.
- the control unit 4 stores data related to various controls in a storage unit 5 which is a nonvolatile memory, and reads out data from the storage unit 5 as necessary.
- the control unit 4 includes a start-up sequence management unit 6, a path management function 7, an HSAPS (high-speed line redundancy switching function) 8a, an in-device redundancy switching function 8b, an LSAPS (low-speed line redundancy switching function) 8c, and a clock. It is equipped with a function such as 8 d, a redundant switchover function. These are realized, for example, in the form of application programs that operate under the operating system.
- the start-up sequence management unit 6 performs a predetermined software start-up system when software reset is performed due to a failure or the like. It executes a sequence of events, arranges the data deployment of the various redundancy switching functions, arbitrates between the various redundancy switching functions, and realizes the resetting of the switching state in which the various redundancy switching functions do not compete with each other. That is what you do.
- the path management function 7 performs management such as setting a communication path relating to the own device and its surroundings.
- HSAPS 8a is an APS function related to high-speed line redundancy switching (ring switching and span switching described above).
- the HSAPS 8a can transmit and receive a control signal indicating a request for performing ring switching between nodes when necessary, and transmits the signal to the section bar of the SDH frame.
- the K-byte request signal (ITU-T Recommendation G.841) transmitted using 8-bit K1 and K2 bytes respectively set in the SOH (SOH) To achieve.
- the intra-device redundancy switching function 8b is an APS function related to the redundancy switching of the line in the own device. As shown in Fig. 7, an IZF card for service traffic and an IZF card for protection traffic are provided in the own device. Among these, an IZF card for service traffic is provided. If a failure occurs in the IZF card, the in-device redundancy switching function 8b switches to using the protection traffic I / F card. At this time, if the protection traffic is enabled on the high-speed line, the intra-device redundancy switching function 8b is used as the protection traffic I / F card. Switches on each card so that they are connected to a high-speed line for protection traffic. Switch.
- L S APS 8 c is an APS function related to redundancy switching of a low-speed line. As shown in Fig. 6, this device has an interface 3 for connecting lines (service traffic and protection traffic) in the device to a plurality of low-speed lines. It has a plurality of switch groups.
- In-device lines (service traffic and protection traffic) leading to high-speed lines are connected to low-speed lines (service traffic and protection traffic) through multiple switches.
- LSAPS 8C can switch between service and protection traffic by switching these switches in the event of a failure. Bridge between the two. Normally, service traffic is used, while unused protection traffic can be used as part-time traffic to make effective use of unused protection traffic. I'm sorry.
- the clock redundancy switching function 8d is an APS function related to the redundancy switching of the reference clock used in the device. This function performs clock redundancy switching between this device A1 and the other device A2. A specific embodiment of the clock redundancy switching function will be described later in detail.
- Each of the various redundancy switching functions starts switching. At times such as when the main signal
- the control data indicating the switching state (or control state) of the switch group or the like is stored in the storage unit 5 as backup data.
- the start-up sequence management unit 6 is configured to execute the various types of redundant switching functions when the backup data is expanded during the execution of the start-up sequence of the software installed in the transmission device. The order is arbitrated, and each switching function resets the control status immediately before the software reset from the backup data saved in the storage unit (non-volatile memory). Even when executing software reset with the redundancy switching function activated, the software reset processing without switching back to the service traffic that is being avoided by the protection system To be able to
- FIG. 8 is a diagram showing a startup sequence performed by the startup sequence management unit 6.
- each of the various redundancy switching functions 7, 8a to 8d backs up its own redundancy switching state (control state).
- the data is stored in the storage unit 5 as the update data, and the task starts to be started.
- each of the path management function 7 and various redundancy switching functions 8a to 8 performs necessary initialization processing and the like in accordance with instructions sequentially sent from the sequence management unit 6.
- the sequence management unit 6 since it is necessary to first generate the basic data required by the various redundancy switching functions 8a to 8d in the initialization processing, the sequence management unit 6 performs path management for generating the basic data. Initialize the function 7 first, and then Redundancy switching function Initialization processing is executed with priority of 8a to 8d.
- each of the path management function 7 and the redundancy switching functions 8a to 8d Upon completion of the initialization processing, each of the path management function 7 and the redundancy switching functions 8a to 8d notifies the startup sequence management unit 6 of the completion. At this stage, you are ready to deploy the backup data.
- the start-up sequence management unit 6 confirms the notification of the completion of the initialization process from all the functions 7, 8a to 8d. At this stage, the start-up sequence management section 6 shifts to a knockup data deployment phase.
- the start-up sequence management section 6 expands the backup data stored in the storage section 5 by using the path management function 7 and the redundancy switching function 8 a to 8. Instruct 8 d sequentially.
- the sequence management unit 6 stores the basic data. Give priority to the generated path management function 7 and execute backup data expansion. It will be in a wait state until the development of basic data is performed. After the deployment of the basic data is performed, the start-up sequence management unit 6 executes the backup data development with the priority of the redundancy switching function 8a to 8d.
- each of the path management function 7 and the redundancy switching functions 8a to 8d includes a predetermined virtual main signal switch memo. It is assumed that the memory space is accessed, this memory space is regarded as the main signal switch, control data is expanded, and all functions are backed up once the backup data is reflected.
- the backup function of the switching function may be developed.
- the start-up sequence management unit 6 confirms the backup data deployment completion notification from all the functions 7, 8a to 8d. At this stage, the startup sequence management unit 6 issues an operation instruction to the path management function 7 and the redundancy switching functions 8a to 8d. As a result, the operation of the installed software is started.
- FIG. 9 is a flowchart showing a specific processing procedure performed by the start-up sequence management unit 6.
- the start-up sequence management unit 6 satisfies the condition of order control for the initialization processing request for each of the path management function 7 and the redundancy switching function 8a to 8d (application software).
- the notification (instruction) is made in the state of being turned on (step A1).
- the order of the notification should be such that the function of generating the basic data for performing the initialization process can be performed in order.
- the startup sequence management unit 6 notifies (instructs) a backup deployment request when confirming that responses have been returned from all functions that have notified the initialization processing request (step A2). Note that this notification also requires order control.Firstly, the notification is started from the path management function 7, which is a basic control process, and then the redundancy switching functions 8a to 8d are notified in order. To
- the start-up sequence management unit 6 sends operation instructions to all functions when it is confirmed that responses have been returned from all functions that have notified the backup data deployment request, and completes the start-up sequence ( Step A3).
- the startup sequence management unit 6 has shifted from the redundancy switching function or all functions for managing the information necessary for the redundancy switching function to operate to a mode in which the backup data can be expanded. Then, it causes each redundant switching function to execute the backup data expansion in any order.
- the order in which this backup backup is deployed is such that, for example, the path management function 7, which is the base for performing the redundancy switching, is performed first, and the necessary information is gathered.
- the backup data deployment of the redundancy switching function 8a to 8d is started. For example, efficiency can be improved by executing the expansion processing of the redundancy switching function first by starting with the one with the larger transmission capacity of the signal to be handled.
- FIG. 10 is a flowchart showing a specific processing procedure by each of the path management function 7 and the redundancy switching functions 8a to 8d.
- the redundancy switching function waits for an initialization processing request from the startup sequence management unit 6 (step B1). After receiving the initialization processing request, the redundancy switching function executes various initialization processings, notifies the start-up sequence management unit 6 of a response indicating completion of the initialization processing (step B2), and starts up. It is in a state of waiting for a backup data deployment request from the sequence management unit 6 (step B3).
- the redundancy switching function After receiving the backup data deployment request, the redundancy switching function generates control data from the held switching state and executes the switching state resetting process (step B4).
- the redundant switching function When the redundant switching function notifies the startup sequence management unit 6 of a response to the backup data deployment request (step B5), the redundant switching function waits for an operation instruction from the startup sequence management unit 6 (step B5). B 6).
- the redundancy switching function When the redundancy switching function receives an operation instruction from the start-up sequence management unit 6, it executes the operation and completes the start-up sequence (step B7).
- the redundancy switching function generates control data necessary for performing the redundancy switching based on information from a function for generating basic data such as the path management function 7.
- the control data is expanded and the redundancy switching control is performed. Is notified to other functions or reflected in a table that can be referenced from other functions.
- the startup sequence the first joke
- the backup data expansion of the long switching function is completed, the next backup data expansion of the redundant switching function will be executed.
- the software is reset while multiple redundant switching functions are functioning, the switching state is redeployed sequentially by each redundant switching function during this startup sequence. Is executed, and the exclusiveness of the control points can be guaranteed by the sequence control management of the start-up sequence.
- the switching state is saved in the storage unit (non-volatile memory), and when the start-up sequence of the software is stopped, The saved backup data in the switching state is expanded, and the state in which service traffic is avoided is reset during software startup. Since the start-up sequence management unit arbitrates the data expansion processing of various redundancy switching functions, there is no conflict in resetting the switching state of each function, and software that retains the switching state does not conflict. Startup is possible.
- the virtual main signal switch memory space is used so that various redundant switching functions do not need to perform direct operations on the actual main signal switch when expanding backup data. Is provided in the storage unit 5, etc., and each redundant switching function during startup accesses the virtual main signal switch memory space, thereby affecting the switching state of various redundant switching functions on the actual line.
- the software can be written without any trouble, and this is reflected on the actual main signal switch immediately before the software starts up, so that the software with multiple redundant switching functions activated Even during a reset, software reset processing can be performed without switching back the service traffic that is being avoided by the protection system. It is something to do. Such processing is realized using a control module.
- FIG. 11 is a diagram for explaining the virtual main signal switch memory space according to the present embodiment.
- Redundancy switching performed during the operation of the transmission equipment is defined in the area where the actual physical main signal switch is address a ******
- the address of b ****** ⁇ must be used as a work area. It is defined on the virtual main signal switch memory space which has exactly the same structure as the main signal switch.
- control data is written in the area from address a ******, the data will be expanded to a memory space for hard switch control, for example.
- Figure 12 shows a control module that provides access to the main signal switch.
- 6 is a flowchart showing a processing procedure by a rule.
- the control module is initially in a state of waiting for a control data write request (step C1). If there is a write request, it is determined whether or not a software startup sequence is in progress (Step C2). If it is not during the start-up sequence, control data is written to the memory area of the address a ****** ⁇ as usual (step C3), and the processing ends. On the other hand, during the start-up sequence, the control data—evening is written to the memory area at address b ****** (step C4). The state of processing in the memory area at this time is shown in D1 in Fig. 13.
- step C5 it is determined whether or not all the functions registered in the start-up sequence have been developed. If not, repeat the processing from step C1. On the other hand, if it is completed, the control data written in the memory area of address b ****** will be replaced with the memory area of address a ******. And then write them all together (Step C6).
- the state of processing in the memory area at this time is shown in D2 of Fig. 14. After that, as shown by D3 in Fig. 14, the process moves to the process of reflecting the control data written on the memory area on the hardware.
- a supplementary explanation of the above-mentioned processing procedure is as follows. That is, the various main signal switches of the transmission device maintain the state immediately before the software reset even during the software start-up sequence, but the redundancy executed during the start-up sequence If the main signal switch is operated directly in the backup data of the switching function, the control immediately before resetting when the software starts up in a situation where multiple redundant switching functions are activated May change state. Therefore, during the start-up sequence, the virtual main signal switch memory space is accessed, and each redundant switching function considers this memory space as the main signal switch and performs control data After the deployment is performed and the backup data of all functions is reflected, the backup data of the redundant switching function is deployed at once.
- the virtual main signal switch memory space is accessed to store the control data developed during the software startup sequence.
- Each redundant switching function writes control data to this virtual main signal switch memory space in turn during the startup sequence, and this virtual main signal switch is also used when it is necessary to know the control state of other redundant switching functions.
- the desired data is read from the signal switch memory space.
- the procedure shifts to the procedure of reflecting the control data to the physical main signal switch as shown in Fig. 14. In this case, the control state immediately before the software reset matches the control data group in the virtual main signal switch memory space, that is, the control state is reset.
- the virtual main signal switch If a write failure occurs when the control data in the memory space is reflected on the physical switch, the redundancy switching function completes the writing of the control data to the virtual main signal switch memory space during the startup sequence. Although the backup data expansion is tentatively improved at this stage, whether or not the final redundant switch redeployment has succeeded is determined by the control of the virtual main signal switch memory space and the actual physical main signal switch. It is determined based on the results reflected in Tsuchi.
- the control data of each main signal switch developed from the backup data used by each switching function during the software startup is being started up. Does not expand directly to the main signal switch, but expands it to the virtual main signal switch memory space, and introduces a method to expand it to the actual main signal switch at once just before the software starts up. This makes it possible to reflect a state in which the switching states of a plurality of switching functions coexist. By this operation, even if a software reset is executed in a state where a plurality of switching functions are activated, the service can be restored without once switching back the service traffic.
- each redundant switching function determines the control mode to protect the service line, and deploys the actual control data on the hardware. I was going up.
- each redundancy switching function only determines the control mode, and the deployment of the control data on the hardware is as shown in FIG. It takes the form of relying on the wear control function.
- the hardware control function receives the control data or control data index passed from each of the various redundancy switching functions, performs exclusion of each redundancy switching function, and performs matching. After that, deploy control over hardware.
- FIG. 16 is a diagram illustrating a processing procedure according to the third embodiment.
- Each redundant switching function generates a control data from the held switching state and passes it to the hardware control function (step E1).
- the hardware control function performs exclusion between the respective redundancy switching functions, obtains consistency, and develops these control states on the hardware (step E2).
- the hardware control function side is allowed to develop the control states of the plurality of redundant switching functions, and the sequence control is executed in this state.
- the sequence control of the start-up sequence management unit becomes unnecessary.
- each redundant switching function relies on the hardware control function to deploy control data on hardware.
- each redundancy switching function itself performs deployment on hardware.
- FIG. 18 is a diagram illustrating a processing procedure according to the third embodiment.
- Each redundant switching function backs up its own control state as well as the control state of other redundant switching functions (step F1). And each redundancy switching function is
- step F2 It generates a control data that reflects the control status of other redundant switching functions, and deploys its own control status to the hardware (step F2).
- each redundant switching function is configured so as to grasp the state of the device as a whole, so that a plurality of redundant switching functions can be performed. Does not occur.
- Embodiments of the present invention will be described with reference to FIG. 19 taking as an example a case where there are two transmission devices operating in the same clock system. I do.
- Reference numerals 1OA and 10B denote transmission devices in which output signals are multiplexed with each other.
- the transmission devices 1OA and 1OB have the same configuration. Therefore, here, the configuration and operation of the transmission device 10A will be mainly described.
- the transmission device 10B the same reference numerals are given to the portions corresponding to the transmission device 10A, and the overlapping description will be partially omitted.
- the low-speed interface circuit 11, the signal processing unit 12, and the high-speed interface circuit 17 in the transmission apparatus constitute a main signal system. It corresponds to the low-speed interface circuits 2-1, 2-2, ADM 1, and high-speed interface circuit 2-3, 2-4 in the transmission equipment in Fig. 6.
- control unit 20 and the backup memory MB in the transmission device in FIG. 19 correspond to the control unit 4 and the storage unit 5 in the transmission device in FIG.
- a clock processing unit 13, an external clock supply unit 14, an internal oscillator 15, and a clock generation unit 16 in the transmission device in FIG. 19 are unique to this embodiment. This is the part corresponding to the clock system.
- the low-speed side signal S 1 is transmitted and received via the low-speed side interface circuit 11, and the low-speed side signal S 1 is sent to the signal processing unit 12.
- the signal processing unit 12 demultiplexes the low-speed signal S 1 and performs predetermined signal processing.
- the signal processing unit 12 generates the high-speed signal S 2 using the internal clock C 0, Send to the side interface circuit 17.
- the high-speed interface circuit 17 amplifies the high-speed signal S 2 and sends it to the multiplexer 18.
- the multiplexer 18 is composed of two transmission devices 10A and 10B.
- Each of the high-speed signals S 2 is transmitted, and the plurality of high-speed signals S 2 are multiplexed.
- the multiplexed signal is transmitted via a high-speed transmission line (for example, an optical fiber cable).
- a high-speed transmission line for example, an optical fiber cable.
- the signal processing unit 12 extracts the clock C1.
- the extracted clock C 1 is sent to the clock processing unit 13.
- the clock processing unit 13 has a clock C 2 power S from the external clock supply device 14, a clock C 3 power from the internal oscillator 15, and other transmission signals.
- Clock C4 is supplied from device 10B.
- the clock processing unit 13 has a function to input a plurality of clocks sent from the outside, and selects one clock from a plurality of input clocks. It has a function and a function to detect alarms indicating abnormalities such as a broken clock for a plurality of input clocks. In this case, the clock processing unit 13 is illustrated by one block, but may be illustrated by a plurality of blocks for each function.
- the clock processing unit 13 selects one clock from a plurality of input clocks C1 to C4 in accordance with a priority order or the like. Then, the selected clock C is output and supplied to the clock generation unit 16.
- the clock generation unit 16 generates an internal clock CO based on the clock C sent from the clock processing unit 13 and supplies the internal clock CO to the signal processing unit 12.
- the clock signal C 4 is also transmitted to the transmission device 10 B.
- the transmission devices 1 OA and 10 B are provided with a control unit CPU for controlling the clock processing unit 13 and the like.
- a memory MA is provided in the control unit CPU, and the memory MA records control data of the own transmission device 1 OA and the other transmission device 10 B currently in operation.
- a backup memory MB is connected to the control unit CPU, and each data developed on the memory MA is regularly backed up. Reading and recording of the knock-up memory MB are controlled by the control circuit CPU.
- the control units CPU of the transmission devices 10A and 10B are connected by a monitoring control communication line 19.
- FIG. 20A shows the clock processing unit 13 and the memory MA and the knock-up memory MB which constitute the transmission device 1 OA
- FIG. 20B shows the transmission device 10 B
- the clock processing unit 13 and the memory MA and the backup memory MB are shown.
- the clocks C1 to C4 are input to the input terminals INl to IN4 of the clock processing unit 13 via the alarm detection units D1 to D4, respectively. . Then, one of them is selected by the control of the control circuit CPU. The selected clock C is output from the output terminal OUT and sent to the clock generation unit 16 as described with reference to FIG.
- switch data SW1 and SW2 corresponding to the frequency f and the phase 0 of the internal clock C0 are recorded.
- switch data SW1 and SW2 corresponding to the frequency f and the phase 0 of the internal clock CO in the other transmission device 10B are recorded. .
- control method of the clock processing unit 13 included in the transmission device 10B and the management method of the memory MA and the backup memory MB are also shown in FIG. 1 Same as OA.
- control circuit CPU of the transmission device 10OA determines whether or not the control circuit CPU of the transmission device 10B is in a communicable state (step 41).
- FIG. 21A and FIG. 21B are examples of the case where both the transmission device 1OA and the transmission device 10B perform the start-up processing.
- the device 10A enters the clock start-up state 3B from the operation state 3A for transmitting the transmission signal over time t, and thereafter,
- the transmission device 10B is delayed from the transmission device 10A, for example, as shown in FIG. , And then transition to the operating state 3C.
- the transmission device 10A is in the operation state 3A and can communicate.
- Step 42 If the transmission device 10B is in the startup state 3B as in t2 to t3, it is determined that communication cannot be performed. If it is determined in step 41 that communication is possible, the transmission device 1B is determined. The reading process of the control data of 0 B is executed (Step 42).
- control data of the transmission device 10A is read from the backup data and executed (step 43). Thereafter, a clock-related alarm collection process is executed (step 44), and the process proceeds to control determination / execution process (step 45).
- step 41 If it is determined in step 41 that the control circuit CPUs of the transmission device 1 OA and the transmission device 10 B cannot communicate with each other, the stand-alone flag is set, and the startup sequence of the transmission device 1 OA is backed up. The control is performed overnight in Cupde (Step 46), and then the process goes to Step 43.
- control decision shown in Fig. 22 and the execution process (step 45) are performed. This will be described with reference to the flowchart of FIG.
- step 51 it is determined by a stand-alone flag whether or not the transmission circuit 10OA and the control circuit CPU of the transmission device 10B can communicate with each other (step 51).
- step 52 it is determined whether or not the transmission circuit 10OA and the control circuit CPU of the transmission device 10B can communicate with each other.
- step 52 it is determined whether or not the transmission circuit 10OA and the control circuit CPU of the transmission device 10B can communicate with each other.
- step 52 it is determined. If the control data of the transmission device 10B and the backup data of the transmission device 10A match and it is determined that they are consistent, the backup / OK flag is set (step 53). Then, it is determined whether there is an alarm about knock-up overnight (step 54). At this time, if there is no alarm, the flow shifts to the control processing A of the transmission device 1 O A (step 55).
- step 51 If the stand-alone flag is set in step 51, the flow shifts to control processing A (step 55) of the transmission device 1OA.
- control data is generated in accordance with the control data of the transmission device 10B (step 56). Then, proceeding to step 54, it is determined whether or not there is an alarm for the control data of the transmission device 10B.
- step 54 if there is an alarm, the switching of clock selection is forcibly prohibited for the backup data of the transmission device 1 OA or the control data of the transmission device 10B. It is determined whether there is switching prohibition information (step 57). If there is no switching prohibition information, control processing for the transmission device 10B is performed. Go to B (Step 58).
- step 57 If there is switching prohibition information in step 57, the process proceeds to one step (step 62 in FIG. 24) of the control processing A of the transmission device 1OA.
- control data of the transmission device 1OA and the control data of the transmission device 10B do not match, the control data generated in accordance with the control data of the transmission device 10B is generated (step 56). ). This is because the transmission device 1OA suspends the operation once and then starts up, whereas the transmission device 10B continues to operate, so the control data of the transmission device 10B is Is judged to be highly reliable.
- control process A of the transmission device 1OA will be described with reference to FIG.
- step 61 it is determined whether there is switching prohibition information in the transmission device 10A (step 61). If there is switching prohibition information, the backup data is expanded into the actual control data (step 62). Then, the startup sequence control of the transmission device 1OA is executed (step 63).
- step 64 it is determined whether the backup ⁇ ⁇ K flag is set (step 64). If the knock-up '0K flag is on, the knock-up data is expanded to the actual control data (step 65). If the backup and the OK flag are not set, the control data of the transmission device 10B is expanded to the actual control data (step 66). Then, the actual control data developed in step 65 and step 66 — In the evening, the startup sequence control of the transmission device 1 OA is executed (step 63).
- step 57 of FIG. 23 if there is the switching prohibition information, the process proceeds to step 62.
- control processing B step 58 of the transmission device 10B in FIG. 23 will be described with reference to FIG.
- control data for clock switching of the transmission device 1OA is generated (step 71).
- the generated control data is developed into actual control data (step 72).
- a switching request message is generated for the transmission device 10B (step 73).
- the clock control is executed on the transmission device 10B (step 74).
- the backup data of its own transmission device and the control data of another transmission device are controlled. Evening is collected and processed.
- the system also collects and processes the presence of warnings for these backups and control data. Then, the consistency between the backup data of the own transmission device and the control data of the other transmission device is determined, the presence or absence of an alarm is determined, and the clock system is switched and processed. For this reason, in the clock system switching start-up sequence, the synchronization relationship of the clock frequency and phase between the plurality of transmission devices is not impaired. Also, in the startup sequence, it is possible to determine and control the optimum state for the state where the system is placed. In the above-described embodiment, the case where there are two transmission devices is described. However, the present invention can be applied to a case where there are three or more transmission devices.
- the clock system when the clock system is switched and started, a clock synchronization relationship between a plurality of transmission devices is ensured, and a stable control state is maintained.
- a communication device for data transmission and a control method thereof can be realized.
- the start-up sequence management unit provided in the control unit of the transmission device arbitrates data expansion processing of various redundancy switching functions, and thus resets the switching state of each function. In this way, it is possible to start up software that maintains the switching state without conflict.
- the present invention it is possible to reflect a state in which the switching states of a plurality of switching functions coexist, and execute software reset while the plurality of switching functions are activated. Service can be restored without having to switch off service traffic once.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54919199A JP4253043B2 (ja) | 1998-03-27 | 1999-03-29 | ソフトウェア立上げ方法、データ伝送用通信装置およびその制御方法 |
EP99910753A EP0986231B1 (en) | 1998-03-27 | 1999-03-29 | Software start-up method for a transmitter having a plurality of redundancy switching functions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/80822 | 1998-03-27 | ||
JP8082298 | 1998-03-27 |
Publications (1)
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WO1999051004A1 true WO1999051004A1 (en) | 1999-10-07 |
Family
ID=13729135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/001604 WO1999051004A1 (en) | 1998-03-27 | 1999-03-29 | Transmitter having redundancy switching function and method for controlling the same |
Country Status (3)
Country | Link |
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EP (1) | EP0986231B1 (ja) |
JP (1) | JP4253043B2 (ja) |
WO (1) | WO1999051004A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020110798A1 (ja) * | 2018-11-29 | 2020-06-04 | 日本電信電話株式会社 | 伝送装置及び伝送方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2613139T3 (es) | 2011-09-12 | 2017-05-22 | Zte Usa, Inc. | Protección de transmisor eficaz de radios completamente de exterior |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09135228A (ja) * | 1995-11-08 | 1997-05-20 | Nippon Telegr & Teleph Corp <Ntt> | 伝送装置 |
JPH09233157A (ja) * | 1996-02-26 | 1997-09-05 | Oki Electric Ind Co Ltd | 伝送システム |
JPH09284362A (ja) * | 1996-04-19 | 1997-10-31 | Nec Eng Ltd | ディジタル信号伝送装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3859468A (en) * | 1973-07-25 | 1975-01-07 | Bell Telephone Labor Inc | Redundant data transmission arrangement |
US5038320A (en) * | 1987-03-13 | 1991-08-06 | International Business Machines Corp. | Computer system with automatic initialization of pluggable option cards |
EP0591437B1 (en) * | 1991-06-26 | 1997-10-01 | AST RESEARCH, Inc. | Multiprocessor distributed initialization and self-test system |
-
1999
- 1999-03-29 JP JP54919199A patent/JP4253043B2/ja not_active Expired - Fee Related
- 1999-03-29 EP EP99910753A patent/EP0986231B1/en not_active Expired - Lifetime
- 1999-03-29 WO PCT/JP1999/001604 patent/WO1999051004A1/ja active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09135228A (ja) * | 1995-11-08 | 1997-05-20 | Nippon Telegr & Teleph Corp <Ntt> | 伝送装置 |
JPH09233157A (ja) * | 1996-02-26 | 1997-09-05 | Oki Electric Ind Co Ltd | 伝送システム |
JPH09284362A (ja) * | 1996-04-19 | 1997-10-31 | Nec Eng Ltd | ディジタル信号伝送装置 |
Non-Patent Citations (1)
Title |
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See also references of EP0986231A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020110798A1 (ja) * | 2018-11-29 | 2020-06-04 | 日本電信電話株式会社 | 伝送装置及び伝送方法 |
JP2020088735A (ja) * | 2018-11-29 | 2020-06-04 | 日本電信電話株式会社 | 伝送装置及び伝送方法 |
JP7032661B2 (ja) | 2018-11-29 | 2022-03-09 | 日本電信電話株式会社 | 伝送装置及び伝送方法 |
Also Published As
Publication number | Publication date |
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JP4253043B2 (ja) | 2009-04-08 |
EP0986231B1 (en) | 2005-07-27 |
EP0986231A1 (en) | 2000-03-15 |
EP0986231A4 (en) | 2003-12-03 |
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