JPS60134352A - Duplex bus control device - Google Patents

Abstract

PURPOSE:To realize easily a maintenance operation of plural processing devices which are installed dispersively, by adopting a common bus of a double system, and using a preliminary system as a system for the maintenance operation. CONSTITUTION:A communication control device 2B which becomes an object of a program loading operation is determined, and thereafter, a maintenance managing device 1 generates a discrete selecting signal D2. The communication control device 2B inputs the discrete selecting signal D2 through a signal line 6B, and selects a common bus 4 of a preliminary system under the condition that a signal C1 on a common bus switching signal line 5 is ''0''. Subsequently, the maintenance managing device 1 selects a loading program from the inside, and loads it on the common bus 4. The communication control device 2B inputs the loading program through its common bus 4. The maintenance managing device 1 outputs a request of its face to the communication control device of a diagnostic object by using the common bus 4 of the preliminary system, receives a data required for a diagnosis, and executes the diagnosis.

Description

[Detailed description of the invention] [Field of application of the invention] INDUSTRIAL APPLICATION This invention is suitable for a distributed control type packet switch etc.

The present invention relates to a suitable duplex bus control device.

[Background of the invention]

Large-capacity packet switching equipment uses a distributed processing method in which multiple processing devices are installed in a distributed manner. In this case, each processing device is called a communication control device.

In systems employing a distributed processing method such as large-capacity packet switching equipment, one of the challenges is how to efficiently perform maintenance operations such as program loading and diagnosis for distributed processing devices.

The main conventional method is to use a working bus. In this method, since the maintenance operation is performed on the active system, the traffic on the active system bus increases and the time for normal processing operations other than maintenance operations is limited.

The second conventional method is to design the allowable throughput of the common bus used as the active system by including the throughput during maintenance operations. This method will lead to an increase in the common bus cost.

A third conventional method is to carry out maintenance operations over a sufficient period of time to reduce fluctuations in traffic on the common bus under equal constraints. This method has the disadvantage that it requires a long time to start up the entire system.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a duplex bus control system that facilitates maintenance operations for a plurality of distributed processing devices.

[Summary of the invention]

A plurality of distributed processing devices are connected via a common bus.

This common bus is a dual system, with the first system being the active system and the second system being the backup system. This dual common bus configuration is widely used to improve system reliability.

The present invention is characterized in that the standby system is used as a system for maintenance operations on the premise that such a dual system common bus is adopted. Maintenance operations are generally based on instructions from a maintenance management device provided separately from the processing device. This maintenance management device switches the dual system common bus.

[Embodiments of the invention] The present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an embodiment of a distributed processing unit applied to a large-capacity packet switch. The maintenance management device 1 manages maintenance operations. This management refers to the management of the schedule and rules (both content and time) of the maintenance operations.

A plurality of communication control devices 2 (2A, 2B,...
2N) are installed in a distributed manner.

Common buses 3 and 4 are dual system common buses, and common bus 3
is a common bus for the main system, that is, the active system, and common bus 4 is a common bus for the protection system. Multiple communication control devices 2A, 2B...
, 2N and the maintenance management device 1 are connected via the common buses 3 and 4.

The maintenance management device 1 has a function of putting the common bus switching control signal C1 on the common bus switching control line 5. The other end of this common bus switching control line 5 is connected to each communication control device 2A, 2B...
.

Furthermore, the maintenance management device 1 and the communication control devices 2A, 2B...
, 2N are system selection individual control signal lines 6A, 6B...
Make a connection with 6N. The maintenance management device 1 generates a system selection signal Di during maintenance operations. Here, 2 means i=1.2
...any one of the rules. The system selection signal 0i is placed on the corresponding signal line among the system selection individual control signal lines 6A, 6B, . . . , 6N. For example, if Dl, signal line 6
If it is D2, get on signal line 6B.

Among the communication control devices, only the corresponding communication control device receives the system selection signal Dε for its own use. The communication control device that has received the system selection signal Di determines that the control signal C1 goes up based on the logic (either 1'' or 10') of the control signal C1 on the common switching control signal line 5. If not (“0”), the standby common bus 4 is selected, and the communication control device and the maintenance management device 1 are connected via the standby common bus 4.

Next, the maintenance management device 1 sends an operation for maintenance operation to the communication control device through the standby common bus 4, and performs the maintenance operation.

The above was a general story of DL, but DI, D2...
It will be clear that the operations described above are performed for each of f)n.

The maintenance operations include a program loading operation for loading a program from the maintenance management device 1 to each communication control device, and a diagnostic operation for each communication control device.

The procedure for the former program loading operation is as follows. The maintenance management device 1 determines the communication control device (for example, 2B) that is the target of the program load operation. After this decision,
The maintenance load 1 generates an individual selection signal D2. The communication control device 2B takes in the individual selection signal D2 via the signal line 6B, and selects the standby common bus 4 when the signal C1 on the common bus switching signal line 5 is 0''.

Thereby, the communication control device 2B is connected to the maintenance management device 1 via the common bus 4. Next, the maintenance management device 1 selects a program for loading from within and transfers it to the common bus 4.
put it on. The communication control device 2B sends out a program for reading via the common bus 4 via the common bus 4.

Import, sequentially write to internal memory. Upon completion of writing all programs, the loading operation of the communication control device 2B ends.

Diagnostic operations are performed by a diagnostic program. child.

The maintenance management device 1 has a diagnostic program therein and sends a request to that effect to the communication control device to be diagnosed.

and the results or data that can be used for diagnosis.

The maintenance management device 1 receives and diagnoses the information. For transmitting requests, results, or data in this diagnostic operation.

The standby common bus 4 is used for this purpose. This common bus 4 selection procedure is the same as the program loading procedure.

Furthermore, a diagnostic program may be included in the communication control device to automatically approve the request. At this time, the loading of the diagnostic program is the same as the above-mentioned program loading, and only the diagnostic program is loaded via the common bus 4 to the maintenance management device 1.
will receive it.

The common bus 4 as a standby system can be used for purposes other than maintenance operations. If any abnormality occurs in the active bus 11 bus 3, the abnormality cannot be recovered (it must not be a temporary abnormality).
The active system is switched from common bus 3 to common bus 4 under the following conditions. This abnormality switching may be performed by providing each communication control device with an abnormality determination function and performing self-switching, or by providing a common system abnormality determination device and performing system switching based on the determination result of this determination device. Good too. This system abnormality determination device can also be substituted for the functions of the maintenance management device 1.

FIG. 2 shows an example diagram mainly showing the internal configuration of the communication control device 2A. Other communication control device 2B.

..., the internal configuration of 2N is basically unchanged.

The communication control device 2A includes a processor 11, a memory 1, an internal bus 12, a bus connection circuit 9, a selector 8, an EX, and a value-or-gate 7.

The bus connection circuit 9 and selector 8 have a bidirectional transfer function.

The two-way transfer function refers to the transfer from internal bus 12 to common bus 3.
Or, in addition to the transfer direction from the common bus 6 or 4 to the internal bus 12.

Two signal lines 6A and 5 connected to the maintenance management device 1 form input lines to the gate 7.

The logic is shown in Table 1. Signal D1 of signal line 6A and signal line 5
and signal C1 only when either one is 11'', signal S
becomes 11', and the signal S under other conditions.

are all @0''. When the signal D1 is 11'', it means that the individual selection signal D1 is rising, and when the signal C1 is @ji, it means that the common selection signal C1 is rising.

Table 1 The meaning of the logic in Table 1 is as follows. When the signal C1 is 10'', the logic is that the common bus 4 is selected when the signal D1 is 1'', and the common bus 3 is selected when the signal D1 is ``o''. Faith.

When the signal C1 is 1'', the logic is that the common bus 4 is selected when the signal D1 is 0'', and the common bus 6 is selected when the signal D1 is 11''.

Note that when the signal C1 is "1", the common bus 1 is selected as the common bus, and when the signal C1 is "0", the common bus 4 is selected as the common bus. This is the premise of table logic.

The selector 8 selects the common bus 6 or 4 according to the logic in Table 1 above. When the selection is completed, the internal bus 12 - bus connection circuit - selector 8 - selected common bus (common bus 3
or 4) - The thread path of the maintenance management device 1 is completed. Maintenance operations are performed on this thread path. Note that the memory 10 is
In addition to memory for storing programs, it has memory for storing various data. The CPU 11 performs processing according to the program.

According to the above embodiment, since various information data for maintenance operations can be sent using the backup system of the redundant bus, the common bus α]
It is possible to eliminate adjustments such as increasing the throughput to match the maintenance operation or lengthening the time of the maintenance operation so as not to increase the throughput load on the common bus.

The maintenance management device 1 may have the function of monitoring which of the common buses 3 and 4 is currently in use, or a separate device having this function may be provided. Furthermore, the bus connection circuit 9 may be provided with this function. The device may include a gate 7. Furthermore, the present invention can be applied not only to exchanges but also to general processing systems.

〔Effect of the invention〕

According to the present invention, maintenance operations can be performed efficiently.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the present invention, and FIG. 2 is a detailed embodiment of the present invention. 1... Maintenance management device, 2 (2A, 2B...2N)
...Communication control device, 3, 4...Double system common bus. 1 figure, 2m

Claims (1)

[Scope of Claims] 1. A plurality of processing devices, a maintenance management device that performs maintenance management of the plurality of processing devices, and a common bus that connects the plurality of processing devices and to which the maintenance management device is connected. and two common buses. Denka's first. A duplex bus control device comprising a second common bus, and one of the first and second common buses is selected for maintenance management by the maintenance management device. 2. The duplex bus control device according to claim 1, wherein the common bus for maintenance management is selected by selecting a backup common bus other than the common bus used in the active system.