JPH0897909A - Electronic exchange system - Google Patents

Abstract

PURPOSE: To select a standby set even when any of active sets with different mount information is faulty by mounting managed devices depending on ORed mount information sets from each of the active sets and storing the result of OR as amount information of standby sets. CONSTITUTION: The system is provided with plural active sets 5, 6 and one standby set 7 as exchanges. Managed sets 51, 53, 61, 62 are mounted to an optional position of plural mount positions and mount information sets 58, 88 representing the presence of mount of the managed sets 51, 53, 61, 62 are stored in the active sets 5, 6. Then managed devices 71, 72, 83 are mounted to plural mount positions decided by OR of the mount information sets 58, 88 of the plural active sets 5, 6 in the standby set 7 and the result of OR is stored as mount information 78 in the standby set 7. Thus, number of the managed sets of the standby set 7 is minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic exchange system which accommodates a plurality of devices having mounting information of subordinate devices in the device.

[0002]

2. Description of the Related Art In conventional electronic exchanges, as described in "Digital Exchange Method", Institute of Electronics and Communication Engineers, March 128, 1986, pages 128-132, electronic exchange systems are used to ensure the reliability of the electronic exchange system. For example, a communication path device having mounting information of a device subordinate device in the exchange and having different accommodation information such as a trunk and a network has a redundant configuration by duplication.

Further, control system devices such as processors and memories that do not have mounting information of subordinate devices in the device have a redundant configuration by multiplexing a plurality of active devices and a spare device.

[0004]

In the prior art, in the case of installing a substitute device at the time of failure for a device having mounting information of subordinate devices in the device such that the number of transmission paths accommodated for each opposite station is different, There is a problem in that equipment having different mounting information for each opposite station must be installed in duplicate and the equipment investment increases.

According to the present invention, a device having mounting information of subordinate devices in the device having different numbers of transmission lines accommodated for each opposite station is not a redundant configuration by duplication, but a spare 1 for a plurality of active stations.
It is possible to switch to the spare device even if one of the active devices with different mounting information has a failure, and to reduce the number of spare devices installed, and to reduce the capital investment for the spare device. The present invention provides an electronic exchange system that can be used.

[0006]

In order to achieve the above object, an electronic exchange system according to the present invention is an electronic exchange system having a plurality of exchanges, wherein the exchanges include a plurality of active devices and a single exchange. A standby device is provided, and the subordinate device is mounted at an arbitrary position of a plurality of mounting positions in the plurality of active devices, and mounting information indicating whether or not the subordinate device is mounted at each mounting position is provided to each active device. The subordinate device is mounted in a plurality of mounting positions determined by the logical sum of the mounting information of the plurality of active devices, and the result of the logical sum is stored in the one spare device. It is characterized in that it is stored as mounting information in the device.

[0007]

The mounting information of the subordinate device in the device of one spare device is created by the logical sum (OR) of the mounting information of the subordinate devices of the plurality of active devices, and the subordinate device determined by this is mounted in the spare device. Moreover, it is set in the spare device as its mounting information, and the failure of the subordinate device is monitored.

With this configuration, for a plurality of active devices having different mounting information, only the subordinate devices of the number equal to the logical sum of the mounting information need to be mounted in the spare device, so that the subordinate device is subordinate to the spare device. The number of mounted devices can be minimized.

When a failure of the active device is detected, AND of the failed active device and the in-device mounting information of the standby device
Then, new mounting information that makes the mounting state effective only for the mounting position that is true is given, and the initial setting is performed so that it operates in place of the active device in the failed state.

During normal operation, failure monitoring is performed for all subordinate devices in the standby device, and when a failure occurs in the active device, it is possible to immediately switch to the standby device and establish a normal system incorporating this standby device.

When the failed working device is recovered, the mounting information of each working device is ORed to restore the original mounting information of the spare device and restore the spare device to its original state. .

When a subordinate device is added to one of the active devices, it is preferably installed in the standby device but not in the active device based on the mounting information of the active device to be expanded and the mounting information of the standby device. Add the subordinate device to the active device at the mounting position where it is not mounted.

According to the present invention, the mounted information setting and the unmounted information are set for each device at the normal time and at the time of failure switching by the memory having the mounting information of each subordinate device and the software for logically operating the contents of the memory. Information setting, initial setting, and failure monitoring can be performed.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 2 shows a configuration example of an electronic exchange system using the present invention. In the figure, reference numerals 2, 3 and 4 denote optical subscriber line remote multiplex transmission devices (RT) that accommodate subscribers. 5, 6 and 7 are exchanges.
1 is a plurality of RTs 2, 3, 4 and a plurality of exchanges 5, 6, 7
It is a digital subscriber unit (LXM) for connecting to and. Reference numerals 21, 31, 41 are highways (transmission lines) HW that connect the RTs 2, 3, 4 and the LXM 1. 511,
531, 611, 621, 711, 721, 731,
It is a transmission line (highway: HW) that connects the exchanges 5, 6, 7 and the LXM 1.

The exchange 7 functions as a backup of the exchanges 5 and 6. The two active exchanges 5 and 6 distribute the load. The working exchanges 5 and 6 differ in the mounting state of the in-apparatus according to the mounting state of the partner path.

FIG. 1 shows an example of the internal configuration of the exchanges 5, 6, 7 shown in FIG. Reference numerals 50, 60 and 70 denote central processing units (CPU) of each exchange. In this embodiment, it is assumed that a memory required for replacement is also mounted in the CPU. 51,5
Reference numerals 2, 53, 54 denote subscriber accommodation racks (LCFs), which are internal devices of the exchange 5, and are also 61, 6 respectively.
2, 63, 64 are 71, 72, 73, 74 of the exchange 6.
Indicates the LCF of the exchange 7. The LCF sends the line status and dial number of the subscriber to the exchange, and also sends a calling signal to the subscriber. Further, it has a function of notifying the CPU of a failure of the transmission path. In FIG. 1, the block indicated by the solid line indicates the currently installed device. Blocks indicated by broken lines indicate unimplemented devices. The exchange 7 is a spare and is, for example, the device 51 of the active exchange 5.
Corresponds to the device 71 of the spare exchange 7, and the device 62 of the active exchange 6 corresponds to the device 72 of the spare exchange 7.

The transmission lines 511 to 514 are LCFs, respectively.
51-54. Similarly, the transmission lines 611-61
4 are LCFs 61 to 64, and transmission lines 711 to 71, respectively.
4 are housed in LCFs 71 to 74, respectively. These transmission lines are also shown by solid lines for mounting and broken lines for not mounting.

Reference numerals 55, 65 and 75 are networks (NW), respectively. Reference numerals 56, 66 and 76 are trunk line transmission lines. 512, 522, 532, 542, 612, 62
2,632,642,712,722,732,742
Is a connection line that connects each LCF and the corresponding NW. These are also shown by solid lines for mounting and broken lines for not mounting.
Reference numerals 57, 67 and 77 are control lines from the CPU to the LCFs.

In FIG. 1, for convenience, 58, 68, and 78 shown outside the blocks of the exchange represent the LCF mounting information stored in the memory placed in the CPU of each exchange. 513, 523, 533, and 543 are LCF mounting information of the exchange 5, and the value "1" indicates the mounted state and the value "0" indicates the unmounted state. In this example, LC
Since F51 and 53 are mounted, mounting information 513 and
533 is set to “1”, and mounting information 523 and 543 is set to “0”. Similarly, 613, 623, 6
33 and 643 indicate LCF mounting information of the exchange 6, and 7
Reference numerals 13, 723, 733 and 743 indicate LCF mounting information of the exchange 7.

The LCFs 71, 72, 73 of the spare exchange 7,
The mounting state of 74 is the logical sum (OR) of the current exchanges 5 and 6.
The result is determined as the mounting information 78, and the subordinate device is mounted in advance so as to take the value shown in the mounting information 78.

FIG. 3 shows an example of a flow of preliminary switching when a failure of the device according to the present invention is detected and active switching when the failure is recovered. Here, both the standby device and the active device will be described by using the exchanges 5, 6, and 7 shown in FIG. 1 as an example.

In the configuration of FIG. 2, if a failure occurs in the active device 5, a process 81 indicates the in-device installation information 58 of the failed device.
Is ANDed with the mounting information 78 in the standby device. This process is for confirming which subordinate device is installed in the active device 5 among subordinate devices installed in the standby device 7.

As the failure detection in the electronic exchange of FIG. 1, a pattern (1) in which firmware (not shown) inside the electronic exchange detects the out-of-synchronization failure of the transmission line by itself and a program failure by the checking mechanism of the firmware itself. Detection pattern 2 for detecting an error and a detection pattern 3 for detecting based on the return information when the CPU sends an order to the device.
And a CPU from another device (not shown)
There is a detection pattern 4 or the like for notifying. Here, not the pattern 1 in which a part of the transmission paths cannot be used, but the failure after the above-mentioned pattern 2 for detecting the failure of the device itself is detected.

In the next process 82, the installed information "1" is written in the spare device for the true result (value "1") of the process 81. That is, the mounting information 78 of the spare device
Write "1" in the corresponding mounting position (any of 713, 723, 733, 743). Next, in process 83, regarding the false result (value “0”) of the process 81, unimplemented information “0” is written in the spare device. As a result, the standby device initial setting time after switching to the standby device can be shortened. Further, it is possible to prevent the failure detection from the subordinate devices other than the subordinate device in the auxiliary device corresponding to the subordinate device of the active device which is the switching source.

In the following process 84, the true value of the calculation result of process 81 is initialized in the spare device. Next, in process 86, the failed active device 5 and the backup device 7 are switched to construct a normal system. As a result, the LCF of the active device 5
LCF 71, 73 of the spare device 7 corresponding to 51, 53
However, instead of the LCFs 51 and 53, the LCFs 51 and 53 are connected to the corresponding transmission lines and the failure of the transmission lines is monitored. Spare device 7
The corresponding LCF 72 does not function because the corresponding LCF does not exist in the active device 5.

The "initial setting" in the process 84 means that the indefinite hardware internal state is returned to the initial value. Since the initial setting of the LCF in this embodiment includes the switches SW inside, it includes all resetting of these SWs, setting of fixed paths, failure monitoring of subordinate transmission lines, and the like.

Next, in the configuration of FIG. 1, when the failure of the active device 5 is recovered, in step 91, the standby device 7 and the active device 5 that has recovered from the failure are switched to construct a normal system by the active device. Next, in process 92, the logical sum (OR) of the in-use device mounting information 58 and 68 is calculated. This is to obtain the original mounting information of the backup device 7. Process 93
Then, with respect to the truth of the calculation result of the process 92, the mounting completion information “1” is written in the spare device. Next, in process 94, the unimplemented information “0” is written in the spare device regarding the false of the calculation result of process 92. Next, in process 95, the spare device is initialized with respect to the truth of the calculation result of process 91. Finally, in process 96, failure monitoring of the LCF of the spare device is set for the true of the calculation result of process 92. Therefore, even during normal operation, the equipment of the entire spare equipment is monitored, and it is guaranteed that the equipment is normal even if the equipment is switched to the spare equipment when the working equipment fails. The system can be established.

Each processing in FIG. 3 is performed by the CPU in each exchange.
Will do.

FIG. 4 shows an example of a flow when an LCF is added to the exchange 5 in the configurations of FIGS. This processing is also performed by the CPU in the exchange. In process 101, the NAND of the mounting information of the subordinate devices that the active device and the standby device have
Then, in operation 102, an AND operation is performed on the operation result of operation 101 and the subordinate device mounting information of the spare device. By the processes 101 and 102, based on the mounting information of the subordinate device of the spare device and the mounting information of the subordinate device of the active device to be added, the mounting position of the spare device is “mounted”.
And the corresponding mounting position of the expansion target device is “not mounted” is detected. Detection of such a mounting position is a condition for expansion. In the example of FIG. 1, for example, the mounting position of the LCF 52 of the active device 5 satisfies this condition. Of course, even if the subordinate device is added on the spare device side, it is possible to add even if this condition is not satisfied. In process 103, a subordinate device is added to the expansion target working device for the true mounting position of the calculation result of process 102, new mounting information is notified to the working device, and the additional subordinate device is initialized. . Next, in process 104, an OR operation is performed between the calculation result of process 103 and the subordinate device mounting information of the active device. In process 105,
The failure of the active device subordinate device which became true in step 104 is monitored, and the additional subordinate device is incorporated into the active system.

[0031]

According to the present invention, by mounting the minimum number of subordinate devices in the spare device, even if any active device having different mounting information fails, a substitute device is mounted in the spare device. And can be switched. Also,
During the switching, the failure information can be monitored with the same load as the active device by providing the backup device with the same mounting information as that of the active device that is the switching source. In the normal state, all failures of the subordinate devices in the standby device are monitored, and in preparation for the failure of the standby device, it is guaranteed that the active device can be replaced immediately.

When a subordinate device which is true in the NAND of the mounting information of the subordinate devices in the device of the active device and the spare device and which is true in the AND of the subordinate device mounting information of the spare device is added to the active device In this case, it is not necessary to add a subordinate device to the spare device.

[Brief description of drawings]

FIG. 1 is a block diagram of a working and a spare electronic exchange according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an electronic exchange system including the electronic exchange of FIG.

FIG. 3 is a flowchart of device switching processing by device failure and device failure recovery in the system of FIG.

FIG. 4 is a flowchart of device addition processing in the system of FIG.

[Explanation of symbols]

1 ... Digital subscriber system equipment (LXM), 2, 3, 4 ... Optical subscriber line remote multiplex transmission equipment (RT), 5, 6, 7 ... Electronic exchange, 50, 60, 70 ... CPU 51-54, 61 ... 64, 71-74 ... Subscriber accommodation rack (LCF), 55, 65, 75 ... Network (NW), 56, 66, 76 ... Trunk transmission line, 57, 67, 77 ... Control from CPU to each LCF Lines, 58, 68, 78 ... Mounting information, 511, 521, 561, 541, 611, 621, 6
31, 641, 711, 721, 731, 741 ... Transmission line (HW).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000005223 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor Fumio Zama, 216, Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. (72) Inventor Kazuto Ujihara, 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Information & Communication Division (72) Inventor Kimihide Jinno 1-6 Uchisai-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Corporation (72) Inventor Kenji Misu 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Yoshio Sato 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihonhon (72) Inventor Shinichi Watanabe 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Toshihisa Shimada 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Yuasa Yuasa 5-7-1, Shiba, Minato-ku, Tokyo NEC Corporation ( 72) Inventor Hiroyuki Iiyama 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Hiroshi Kuwabara 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (72) Inventor Kunihiro Sakamoto 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (8)

[Claims] 1. An electronic exchange system including a plurality of exchanges, wherein the exchanges include a plurality of active devices and a spare device, and a plurality of mounting positions in the plurality of active devices. The subordinate device is mounted at an arbitrary position of the subordinate device, and mounting information indicating whether or not the subordinate device is mounted at each mounting position is stored in each active device, and the plurality of active devices are stored in one spare device. An electronic exchange system, wherein subordinate devices are mounted at a plurality of mounting positions determined by a logical sum of mounting information of respective devices, and a result of the logical sum is stored as mounting information in a spare device. 2. The working device and the backup device each include storage means for storing its own mounting information.
Electronic switching system described. 3. The electronic exchange system according to claim 1, further comprising means for detecting a failure in each of the plurality of active devices and one standby device. 4. When a failure of one of the plurality of active devices is detected, initial setting is performed only for a subordinate device of the spare device corresponding to a subordinate device of the active device, 4. The electronic exchange system according to claim 3, wherein a spare device is operated in place of the failed working device. 5. The logical product of the mounting information of the spare device and the mounting information of the failed active device is set, and the result of the logical product is set as new mounting information of the spare device. Item 4. The electronic exchange system according to Item 4. 6. The electronic exchange system according to claim 2, wherein the failure of the standby device is monitored even during the normal operation of the plurality of active devices. 7. When the subordinate device is added to any of the plurality of active devices, the mounting information of the active device to be added is "unknown" based on the mounting information of the active device and the spare device. Detecting a mounting position where the mounting position of the spare device corresponding to the mounting position of "mounting" is "mounted", and adding a new subordinate device to the mounting position of the working device of the expansion target corresponding to the mounting position 7. The electronic exchange system according to claim 1, wherein the mounting information of the current device is updated. 8. The NAN of the mounting information of the working device to be added and the mounting information of the spare device is detected by the mounting position.
8. The electronic exchange system according to claim 7, wherein a D operation is performed and the operation result is ANDed with the mounting information of the spare device.