JP3150472B2 - Switching redundant system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a redundant system switching method, for example, an interface module (IF) adopting a redundant configuration in a dedicated line node device (CNE).
Module) and the redundant system switching method in the subscriber line terminal equipment module (SLT module).

[0002]

2. Description of the Related Art A dedicated line node device is one component of a digital leased line service system. The leased line node device 1 has, for example, a schematic configuration as shown in FIG.

[0003] That is, with a line setting module 2 having a line setting function (cross-connect function) interposed therebetween, all or a part of a transmission line termination function, a transmission line interface function, a multiplexing function, and a line termination function are handled. A plurality of interface modules 3 and 4 having different signal types (optical signals or electric signals) and the like,
6 and each of the above-described modules 2 to 2
A common processing module (COM module) 7 for performing control and the like of 6 is provided, and the dedicated line node device 1 is configured.

The dedicated line node device 1 comprising such modules 2 to 7 employs an appropriate redundant configuration in order to enhance the reliability of communication, and includes the interface modules 3 and 4 and the subscriber line terminal device module. All or some of the modules 5 and 6 employ a redundant configuration as shown in FIG. Note that the module 10 shown in FIG. 3 will be described below as a subscriber line terminal equipment module accommodating a transmission line made of a metallic cable.

[0005] The subscriber line terminal unit module 10 shown in FIG. 3 accommodates 16 transmission lines (subscriber lines) L1 to L16 connected to a home data line terminal unit (DSU). is there.

[0006] Half of the transmission lines L1 to L8 are, for example, a first transmission line switching unit 11 using a relay as a switching configuration.
And the first transmission line switching unit 11
Are connected to the number of interface boards 111 to 119 which is one more than the number of connected transmission paths. One of these
One interface board 119 is a spare common to the other eight interface boards 111 to 118. Each of the interface boards 111, 112,..., 119 has a transmission line termination function.

Eight regular interface boards 111 to 11
8 is normal, the first transmission line switching unit 11 connects the transmission lines L1 to L8 to the regular interface boards 111 to 111.
118 are connected in a one-to-one correspondence, and if any one of the eight regular interface boards 111-118 (i = 1-8) fails, the first transmission is performed. The transmission line Li originally connected to the regular interface board 11i is connected to the spare interface board 119 by the path switching unit 11. In practice, in the first transmission line switching unit 11, the transmission line Li is branched into two, one of which is directly connected to the interface board 11i, and the other of which is connected via a loop circuit unit or a relay unit. 119 is connected. Therefore, the connection control between the transmission line Li and the backup interface board 119 by the first transmission path switching unit 11 can be viewed as forming a path from the interface board 11i to the backup interface board 119 from a different viewpoint.

Similarly, the other half of the transmission lines L9 to L16 are connected to the predetermined one of the eight regular interface boards 121 to 128 or the spare interface board 129 by the second transmission line switching unit 12. The connection is controlled.

A total of 18 interface boards 111 to 11
Reference numerals 9 and 121 to 129 denote an intra-station line termination common device (OSU COM) 13 of the 0-system and the 1-system constituting the redundant system.
And 14. In-station line termination common device 1
Numerals 3 and 14 have a multiplexing function and a line termination function, respectively, and are connected to the above-described line setting module 2 via a main signal / status signal line. Here, since the effective 16 interface boards may change, the transmission line switching operation section (see FIG. 4) in each of the intra-station line termination common devices 13 and 14 for performing a state change or the like corresponding thereto. Is provided. In this specification, switching between the intra-station line termination common devices 13 and 14 will not be described.

FIGS. 2 and 3 mainly show the configuration as viewed from the flow of the transmission signal. As described above, the interface board portion is one of eight regular interface boards.
A redundant system having a number of spare interface boards is configured, and the leased line node device 1 also has a configuration for switching the redundant configuration. Such a configuration also switches the internal operations and internal states of the intra-station line termination common devices 13 and 14 according to the change of the effective interface board.

FIG. 4 shows a conventional switching configuration around an interface board adopting such a redundant configuration, and includes parts not shown in FIG. 4, the same and corresponding parts as those in FIG. 3 are denoted by the same and corresponding reference numerals.

In FIG. 4, when a failure occurs in any of the interface boards (here, 11i) or the transmission line Li connected to the interface board 11i, the signal lines are not shown, but are not shown. The control unit 20 in the common processing module 7 is notified via the system interface unit 21. The control unit 20 can detect that a failure has occurred in the interface board 11i or the transmission line Li, but cannot detect which one has failed.

At this time, the control unit 20 connects the transmission line Li connected to the interface board 11i to the spare interface board 119, or changes the intra-station line termination common devices 13 and 14 in accordance with the change of the interface board. A switching command for switching the internal state is transmitted to the control system interface unit 2 in the subscriber line terminal module 10.
Give to 1. Further, the control unit 20 supplies a test signal to the intra-office line termination common devices 13, 14 and the like to perform a self-test. Note that the above-mentioned switching command does not mean that the switching is confirmed and commanded.
This means that the switching is determined only when the result that the interface board 11i is not the i but the interface board 11i is a failure.

The control system interface unit 21 is a control memory (CM) 21 storing various control data.
a and the first and / or second transmission line switching unit 11
A and / or 12 and a switching command via a control bus to an 8/1 switching signal processing unit 22 which is a part of the monitoring configuration, and a control memory in the 8/1 switching signal processing unit 22 is provided. 22a holds a B signal and a C signal (which may be the same as the B signal) described later.

First or second transmission line switching unit 11 or 12
Is determined by an A signal from the control system interface unit 21.
As described above, the connection between the transmission path and the interface board and the connection between the interface boards are controlled. That is,
The switching of the interface board unit having the redundant configuration is executed.

The control unit 20 supplies a line test signal to, for example, the in-station line termination common unit 13 or 14 which is in a standby system at that time, and performs a line test (A) using the path set by the A signal described above. For example, from the interface board 11i having a possibility of failure to the spare interface board 1
19, etc.) to determine whether an abnormality has occurred in the interface board 11i.
A self-diagnosis is performed to determine whether the error occurs in the transmission line Li normally connected to i. During the self-diagnosis, the control unit 20 may appropriately change the A signal.

As a result of the self-diagnosis, if a result indicating that a failure has occurred in the interface board 11i instead of the transmission line Li is obtained, the control system interface unit 21 outputs the A signal determined under the control of the control unit 20. Output the first
The transmission line switching unit 11 executes a fixed switching such that the spare interface board 119 is used instead of the interface board 11i.

If a result indicating that a failure has occurred in the interface board 11i is obtained, for example, the control unit 20
, The 8/1 switching signal processing unit 22 converts the B signal held in the internal control memory 22a into the transmission line switching action unit 13a in each of the intra-station line termination common devices 13 and 14. , 14a, and using the spare interface board 119 in place of the interface board 11i.
The internal state and internal operation of the device 14 are switched.

The 8/1 switching signal processing section 22 outputs the C signal to the alarm interface section 23 almost simultaneously with the output of the B signal. The alarm interface unit 23 is a part that mainly interfaces with the alarm unit 24 in the common processing module 7, and includes an 8/1 switching alarm generating unit 23a.
And a memory 23b. 8/1 switching alarm generator 2
3a provides a switching alarm signal to the alarm unit 24,
Interface board 11i that was switched from or failed
An alarm indicating the information and the like is generated. Also, the memory 23b
129 stores the used / unused information for each of the interface boards 111,..., 129, updates the contents according to the C signal, and switches at least the updated used / unused information. Interface board 11
i, 119, and these interface boards 11i,
119 is set to a use state or an unused state.

When the 8/1 switching signal processing unit 22 completes the switching operation such as the output of the B signal and the C signal, it notifies the switching response to the control unit interface unit 21, and the alarm interface unit 23 performs the switching alarm process. Upon completion, the control unit interface unit 21 is notified.
Notifies the control unit 20 of the end of the switching.

As a result, the switching of the interface board portion is completed, and communication via the transmission line Li using the spare interface board 119 can be executed.

If the result of the self-diagnosis is that a failure has occurred in the transmission line Li, for example, the interface board is brought into the previous connection state.

[0023]

However, according to the conventional redundant system switching configuration of the interface board, although there is only one type of trigger for switching, a portion that includes a control memory and executes the switching control is a module. A control system interface unit 21 and an 8/1 switching signal processing unit 22
It can be said that the configuration is complicated.

The control system interface unit 21 and the 8/1 switching signal processing unit 2 perform the switching control.
2 is provided for the following reason.
Even if only the interface board is switched, it is necessary to switch the internal states of the intra-station line termination common devices 13 and 14 in accordance with the switching, and there is a component whose switching process should be stopped during the self-diagnosis period. Are taken into account in two places.

Further, since there are two parts for executing the switching control, the control system interface unit 2 is controlled by various causes such as a setting error of the control memories 21a and 22a.
There is a possibility that a state mismatch occurs between the 1 and 8/1 switching signal processing units 22, and there is a possibility that switching as a whole cannot be properly performed due to a timing shift at the time of switching. For example, such a state mismatch is likely to occur when a part of the circuit board constituting the subscriber line terminal module 10 is inserted or removed.

The present invention has been made in view of the above points, and has been made to provide a switching method of a redundant system which can simplify a switching control configuration and can execute switching appropriately and with high quality. Things.

[0027]

In order to solve the above-mentioned problems, in a method for switching a redundant system according to the present invention, switching object configuration means (111 to 129) adopting a redundant configuration.
Switching execution means (11, 12) for executing switching to the switching target constituent means, and changing the internal state or executing predetermined processing in accordance with the switching of the switching target constituent means. Switching support processing means described above
(13a, 14a, 23) and control means (21) for controlling the switching by the switching object constituting means, the control means giving a switching command to the switching executing means, whereby the switching executing means becomes the switching object constituting means , And the switching executing means supplies a signal for activating a process associated with switching by each switching target constituent means to each switching corresponding processing means.

[0028] Here, the control means switching execution means has on the one or more switching corresponding processing means caused by the switching
A signal for controlling the output timing of the signal for activating the process is given to the switching execution means, and the switching execution means gives a signal for activating the process accompanying the switching to the predetermined switching corresponding processing means at a timing according to the timing control signal. Is preferred.

[0029]

In the case where it becomes necessary to switch the switching target constituent means adopting the redundant configuration, it is not sufficient to switch only the switching target constituent means. It is necessary to change an internal state or an internal operation or execute a predetermined process in accordance with the switching of the constituent means. In such a case, it is conceivable to separately provide a part for performing the switching control for the switching target constituent means and a part for performing the control for the switching corresponding processing means. Discrepancies may occur.

Therefore, in the present invention, only the control means for controlling the switching of the switching target constituent means is provided, and the control means gives a switching command to the switching executing means, so that the switching executing means switches to the switching target constituent means. while running, the switching execution unit, was to provide a signal for starting processing in response to switching by the switching object configuration means at each switch corresponding processing means. That is, the control portion is unified to simplify the configuration, and the room for the problem of state mismatch between the control portions is completely eliminated.

Note that, depending on the switching corresponding processing means, the timing of the processing may be different from the switching timing of the switching target constituent means. In such a case, the following is preferable. That is, the control means supplies the switching execution means with a signal for controlling the output timing of the signal which the switching execution means gives to one or more switching correspondence processing means, and the switching execution means performs predetermined timing at a timing corresponding to the timing control signal It is preferable to supply a signal for activating the process associated with the switching to the switching corresponding processing means.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a subscriber line terminal equipment module of a leased line node device will be described in detail with reference to the drawings. FIG. 1 shows a main configuration of a leased line node device to which the switching method of the redundant system of this embodiment is applied. The same reference numerals as in FIG. Is shown.

This embodiment is also based on the leased line node device 1 having the configuration shown in FIG. 2 and the subscriber line terminal module 10 having the configuration shown in FIG.

In this embodiment, as shown in FIG. 1, the conventional 8/1 switching signal processing unit 22 is not provided, and the transmission line switching inside the intra-station line termination common devices 13 and 14 is not performed. A B signal applied to the action units 13a and 14a,
The C signal given to the alarm interface unit 23 is 8/1
In place of the switching signal processing unit 22, first and / or second transmission line switching units 11 and / or 12 are generated.

That is, the control system interface unit 21 in the subscriber line terminal module 10 to which the switching command is given from the control unit 20 gives a signal to the 8/1 switching signal processing unit 22 which does not exist. Instead, an A signal is given to the first and / or second transmission line switching units 11 and / or 12. The first and second transmission line switching units 11 and 12 generate a B signal and a C signal in addition to a configuration for switching between the interface board and the transmission path and between the interface boards, and generate these signals. It has been made to be. Further, in the case of this embodiment, the control system interface unit 21 includes the first and / or second transmission line switching unit 1.
A D signal indicating the self-diagnosis period or out of the self-diagnosis period (including after the completion of the self-diagnosis) is also given to 1 and / or 12.

FIG. 5 shows the first and second transmission line switching units 11.
2 shows a detailed configuration of a signal control circuit 30 for outputting a B signal and a C signal in the signal control circuit 12.

For example, each bit of the negative logic A signal consisting of 4 bits corresponds to each of the inverter circuits 311 and 31 of the input stage.
2, 313, 314 and output stage inverter circuit 32
The signals are directly output as bits of the B signal via 1, 322, 323, and 324. Also,
Inverter circuits 311, 312, 313, 3 of the input stage
Each bit of the A signal inverted via 14 is
The corresponding AND circuits 331, 332, 333, 334 are input. AND circuits 331, 332, 333, 3
34, a negative logic D signal (1 bit) is commonly supplied as it is via two-stage inverter circuits 34 and 35 with the same logic. Each AND circuit 33
Outputs of 1, 332, 333, 334 are output as respective bits of the C signal via inverter circuits 361, 362, 363, 364 at the output stage.

That is, the first and second transmission line switching units 1
The signal control circuits 30 in 1 and 12 transmit the A signal as it is as a B signal to the transmission line switching action sections 13a and 14a inside the intra-station line termination common devices 13 and 14 regardless of whether the self-diagnosis period is present. During the self-diagnosis period, a meaningless C signal of all “H” is applied to the alarm interface unit 23 regardless of the A signal.
The signal is used as it is as the C signal.
3 is given.

Therefore, the combination pattern of the logic levels of the B signal and the C signal according to the present embodiment is different from the conventional one, but the meaning of the bit pattern is significant, and the transmission line switching units 13a and 14a and the alarm The system interface unit 23 has been modified so that it can be processed according to the new bit pattern.

In the configuration of the embodiment shown in FIG. 1, one of the interface boards (here, 11i) or the transmission line L connected to this interface board 11i is used.
When a failure occurs in i, the occurrence of the failure is notified to the control unit 20 in the common processing module 7 via the control system interface unit 21, although illustration of the signal lines is omitted.

At this time, the control unit 20 connects the transmission line Li connected to the interface board 11i to the spare interface board 119, or changes the intra-station line termination common devices 13 and 14 according to the change of the interface board. A switching command for switching the internal state is transmitted to the control system interface unit 2 in the subscriber line terminal module 10.
Give to 1. Further, the control unit 20 makes a self-diagnosis via the control system interface unit 21. During the self-diagnosis period, a switching command to output not only the A signal but also a significant D signal from the control system interface unit 21 is given to the control system interface unit 21.

The control system interface unit 21 to which such a switching command has been given is stored in the control memory (CM) 2
1a, an A signal and a significant D signal are provided to the first and / or second transmission line switching units 11 and / or 12 during the self-diagnosis period. Note that the A signal may be changed according to the test stage (self-diagnosis stage). At the time of the switching operation including the self-diagnosis, both the first and second transmission line switching units 11 and 12 may be operated as one transmission line switching unit. Only one of the transmission line switching units 11 or 12 related to the panel 11i or the transmission line Li may be operated.

As described above, the first and / or second transmission line switching units 11 and / or 12 use the A signal from the control system interface unit 21 to connect between the transmission lines and the interface boards and between the interface boards. Perform control. Also, the first and / or second transmission line switching units 11 and / or 12
Gives a B signal having the same content as the A signal to the transmission line switching units 13a and 14a inside the intra-station line termination common devices 13 and 14. Note that the first or second transmission line switching unit 1
In the case of 1 or 12, since the D signal is significant, the C signal is not given to the alarm interface unit 23 during this self-diagnosis period.

The control unit 20 omits illustration of signal lines, but, for example, via a control system interface unit 21.
A line test signal is given to, for example, the intra-station line termination common device 13 or 14 which is in a standby system at that time, and the above-described A
A line test (for example, a transmission test from the interface board 11i having a possibility of failure to the spare interface board 119) using the route set by the signal is performed. A self-diagnosis is performed to determine whether the error occurs in the transmission line Li normally connected to the board 11i. During the self-diagnosis, the control unit 20 may appropriately change the A signal via the control system interface unit 21. Further, the intra-office line termination common device 13 or 14
The internal state of the housed interface board is changed by the B signal.
Perform according to the signal from.

As a result of such self-diagnosis, if a result indicating that a failure has occurred in the interface board 11i is obtained, the first and / or second transmission line switching units 11 and / or 12
Determines the switching using the spare interface board 119 in place of the interface board 11i by the A signal, and the transmission line switching action sections 13a and 14a inside the intra-station line termination common devices 13 and 14 perform the first and / or In accordance with the use of the spare interface board 119 in place of the interface board 11i, the switching of the internal operation of the internal state is determined by the B signal given via the second transmission path switching section 11 and / or 12.

Further, when the self-diagnosis is completed after the interface board 11i is isolated as a failure, the control system interface unit 21 makes the D signal insignificant, so the first and / or second transmission line switching unit 11 and / or Reference numeral 12 gives the C signal having the same content as the A signal to the alarm interface unit 23. At this time, in the alarm interface unit 23, the 8/1 switching alarm generating unit 23a gives a switching alarm signal to the alarm unit 24, and issues an alarm indicating the switching or the information of the faulty interface panel 11i from the alarm unit 24. The memory 23b generates / uses each of the interface boards 111,..., 129 according to the given C signal.
The unused information is updated, and the updated used / unused information is switched at least by the interface board 11i relating to the switching,
119, the interface boards 11i, 11
9 is set to a use state or an unused state.

In the case of this embodiment, the control system interface unit 21 also controls the output of the B signal and the C signal, and the control unit interface unit 21 outputs these signals (when the switching is completed). Notify section 20.

Thus, the switching of the interface board is completed, and the communication via the transmission line Li using the spare interface board 119 can be executed.

If the result of the self-diagnosis shows that the failure has occurred not in the interface board 11i but in the transmission line Li, even if the interface board is switched during the self-diagnosis, the self-diagnosis is completed. The interface panel returns to the original state, and the intra-office line termination common device 13
Also, the internal state and internal operation of 14 and 14 return to the contents before the failure detection.

As described above, according to the above embodiment, since the components for controlling the switching of the interface board are unified in the control system interface unit 21, the overall configuration can be simplified as compared with the conventional one. . In addition, since the components for controlling the switching of the interface board are unified in the control system interface unit 21, the conventional problem that there is a possibility that there are two control components and a state mismatch may occur naturally occurs. Absent. For example, the first and second
When the board on which the transmission path switching units 11 and 12 are mounted is inserted and removed, the B signal and the C signal may not correspond to the A signal in the related art.
Since the B signal and the C signal are output from the first and second transmission line switching units 11 and 12, the A signal and the B signal are always output.
The correspondence between the signal and the C signal can be maintained.

The components for controlling the switching of the interface board are unified into the control system interface unit 21.
By the control, the first and / or second transmission line switching unit 11
In the case where the signal is simply distributed and generated in and / or 12, the timing of the distributed and generated signal may occur at an undesired timing, but in the case of the above embodiment, the timing is also controlled by the D signal. The first and / or second transmission line switching units 11 and / or 1
Signals can be generated at a preferable timing from 2.

In the above embodiment, the present invention is applied to a leased line node device. However, the present invention can be applied to other transmission devices. However, the present invention is not limited to the interface module and the subscriber line terminal module. In short, it is only necessary that a portion for performing switching of the redundant system in response to a signal from the control configuration be provided with a configuration for generating a signal to be given to a component that needs to supply the switching information.

In the above embodiment, a redundant system having one spare processing configuration for eight processing configurations is assumed, but N (N is an integer including 1) The present invention can be applied to a redundant system having one spare processing configuration with respect to the above processing configuration, and the present invention can also be applied to a redundant system having two or more spare processing configurations. can do.

[0054]

As described above, according to the present invention, only the control means for controlling the switching of the switching target constituent means is provided, and this control means gives the switching instruction to the switching execution means, so that the switching execution means is provided. and executes switching for switching object configuration means, the switching execution unit, since a signal for starting processing in response to switching by the switching target configuration <br/> means and to give to each switching corresponding processing means, switching control The configuration can be unified and the configuration can be simplified, and the room where the problem of state inconsistency among a plurality of switching control configurations can be completely eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration to which a redundant system switching method according to an embodiment is applied.

FIG. 2 is a block diagram illustrating a schematic configuration of a leased line node device.

FIG. 3 is a block diagram showing a transmission configuration of the subscriber line terminal module.

FIG. 4 is a block diagram showing a conventional redundant system switching configuration for a subscriber line terminal station module.

FIG. 5 is a block diagram illustrating a detailed configuration of a signal control circuit in the transmission line switching unit according to the embodiment.

[Explanation of symbols]

10: subscriber line terminal module (SLT module), 11, 12: transmission line switching unit, 111-118, 1
21 to 128 ... regular interface board, 119, 129
··· Stand-by interface board, 13, 14 ··· Intra-office line termination common device (OCUCOM), 13a, 14a ··· transmission line switching action unit, 20 ··· control unit, 21 ··· control system interface unit, 23 ··· alarm system interface unit.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04L 1/22 H04J 3/00 H04L 29/14

Claims (2)

(57) [Claims] 1. A switching target configuration unit adopting a redundant configuration, a switching execution unit for executing switching to the switching target configuration unit, and changing an internal state and an internal operation according to the switching of the switching target configuration unit. And at least one switching corresponding processing means for causing the switching execution means to perform the predetermined processing, and control means for controlling the switching by the switching object configuration means. The control means sends a switching command to the switching execution means. Accordingly, the switching execution means executes switching to the switching target configuration means, and the switching execution means outputs a signal for activating a process associated with switching by the switching target configuration means to each of the switching target configuration means. A redundant system switching method, which is provided to corresponding processing means. 2. The control means according to claim 1, wherein said switching execution means is one.
Switching to be given to the above-mentioned switching corresponding processing means or more.
A signal for controlling the output timing of the signal for activating the process associated with the switching control is provided to the switching execution unit, and the switching execution unit activates the process associated with switching to the predetermined switching corresponding processing unit at a timing corresponding to the timing control signal. 2. The method for switching a redundant system according to claim 1, wherein a signal for causing the redundant system is provided.