JPS5837747B2 - Remote control method for data communication network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote control method for a data communication network.

The scale of data communications between host computers and data terminals installed in remote locations is expanding year by year, and the conventional radial communication format in which data terminals are directly accommodated in host computers has been replaced by relay exchanges. There is a tendency to develop into a network.

Such a data communication network consists of relay exchanges and high-speed relay lines connecting these exchanges, and has features such as efficient use of the lines and improved reliability against line failures due to the detour relay function.

On the other hand, in such networks, it is important to maintain and manage trunk exchanges, trunk lines, and subscriber lines, and a method is usually used in which a network central control device is installed separately from the host computer to perform remote control. There is.

FIG. 1 is a block diagram of an example of a conventional remote control system for a data communication network, and FIG. 2 is a sequence diagram of a diagnostic procedure therebetween.

In this conventional method, the network centralized control device N
The control line CL from the CC is connected to some trunk exchanges NP1 and NP2 that accommodate host computers H, for example.
It is provided only for

Now, a case will be described in which the network central control unit NCC inspects each of the relay exchanges NPI to NP3 that accommodate data terminals T through subscriber lines SL.

A predetermined inquiry period T from the network central control device NCC
For each relay exchange NP1 to NP3 for each D,
When the inquiry messages HCK1 to HCK3 are transmitted, each transit exchange NPI to NP3 sends a response message PSP containing the status word and line status word, respectively.
1 to return PSP3.

In this case, the inquiry messages HCK2, HCK3 and the response messages RSP2, RSP3 are sent and received via the relay exchange NP1 or the relay exchanges NP1, NP2, respectively, as is clear from FIG.

The network central controller NCC sends a response message R
Each of SPI to RSP3 is analyzed and the judgments shown in the following table are made. If it is recognized as a failure, this is notified to the central maintenance personnel.

In such a system, for example, the trunk exchange NP3
If the trunk lines TL23 and TL53 for the relay line TL23 and TL53 fail at the same time, the network central control unit NCC determines whether there is a failure in the trunk line TL23 or TL53 or whether the trunk exchange NP3
According to the determination conditions shown in the previous table, it is determined that the failure is in the relay exchange NP3.

This means that the trunk exchange NP2 and the trunk line TL1 2
, TL42, TL25, the trunk exchange NP5, and the trunk lines TL15, TL45, TL25.

If such a situation occurs, in the conventional system, it is impossible to diagnose by remote control from the network central control device NCC, and the relay exchanges NP2, NP in the remote location
3. It was necessary to dispatch maintenance personnel to the location where NP5 was installed, and there was a drawback that it took a lot of manpower and time to isolate and repair the failure.

An object of the present invention is to provide a remote control method for a data communication network that eliminates the drawbacks of the prior art described above, enables remote diagnosis even in the event of simultaneous faults in relay lines, and shortens the time for isolating and repairing faulty parts. It is about providing.

The present invention is characterized by a remote control system for a data communication network that provides a control line from a network central control device to all relay exchanges, isolates the faulty part through this, and executes a diagnostic program for the relay exchanges. It is in.

Embodiments of the present invention will be described in detail below with reference to FIGS. 3 to 7.

First, the basic operation of the remote control system for a data communication network according to the present invention will be explained based on FIGS. 3 to 5.

FIG. 3 is a block diagram of an embodiment of a remote control method for a data communication network according to the present invention, FIG. 4 is a sequence diagram of the diagnosis, and FIG. 5 is a sequence diagram of the remote loop test.

Here, NCC is a network centralized control device, NPI
~NP5 are transit exchanges, H is a host computer accommodated in the transit exchanges NP1 and NP4, T is a data terminal accommodated in the transit exchanges NP2, NP3, and NP5, and TL12, TL14, TL1 5 , T
L23 , TL25 , TL42 , TL45 , TL
53 is a trunk line between trunk exchanges NP1 to NP5, and SL is a subscriber line.The contents of these are not necessarily the same as those in FIG. 1, but are similar, so they are For convenience, the same reference numerals are given.

Note that CL1 to CL5 are control lines provided directly from the network centralized control center NCC to each of the relay exchanges NP1 to NP5, respectively.

These control lines do not necessarily have to be high-speed lines, and low-speed and relatively inexpensive lines such as public telephone lines or public data communication lines can be used.

For example, an explanation will be given of an inquiry related to the relay exchange NP3.

The network central control device NCC sends an inquiry message HCK3 through the control line CL3.

Upon receiving this, the relay exchange NP3 further sends the following information to the data terminal T1 and the relay exchanges NP2 and NP5.
Through the subscriber line SL, trunk lines TL23 and TL53,
Questionnaire messages HCK3S, HCK2, respectively.
Send HCK5.

Response messages RSP3S and RSP2 to these
, RSP5, the relay exchange NP3 determines whether they are correct or not, and sends the result back to the network central control unit NCC through the control line CL3 as a response message RSP3.

This makes it easy to distinguish between a fault in the transit exchange NP3 and a fault in each line related to the fault.

That is, if the response message RSP3 is not returned, it means that there is a failure in the transit exchange NP3, and the response message RS
If P3 is returned, the relay exchange NP3 itself can detect the status of each line system related to the relay exchange NP3 based on the contents, not necessarily a failure.

Regarding the other relay exchanges NP2 and NP5, the inquiry can be conducted in exactly the same manner as above.

This periodic examination is repeated at a predetermined period TD, as in the conventional example.

Next, a remote loop test from the network central control unit NCC is performed on the line system determined to be faulty by the above-mentioned interim diagnosis, and it is determined whether the fault is in the line control unit in the relay exchange or in the line. Conduct a test.

This operation sequence will be explained with reference to FIG.

First, the network central control device NCC sends a loop instruction LP to the relay exchange NP3 through the control line CL3.
Give 3.

In response to this, the trunk exchange NP3 switches the trunk line TL23.
, TL53 before the modem M, and the line control section of the trunk exchange NP3 and the trunk line TL23,T.
Perform loop setting LP on each side of L53, and connect trunk line TL2.
3. Loop test LT of line control section for TL53
The results are sent to the network central control unit NCC as a loop test report RLP3 through the control line CL3.
Send it back to

Next, when a loop test instruction LPT2 is given to the trunk exchange NP2 through the control line CL2, the trunk exchange NP2 performs a loop test LT of the trunk line TL23 up to the other party's modem M, including itself. The results are sent back to the network central controller NCC as a loop test report RLP2 through the control line CL2.

Similarly, control line CL5 is connected to trunk exchange NP5.
A loop test instruction LPT5 is given through the loop test report RLP5, and the result is returned as a loop test report RLP5.

After that, a loop cancellation instruction LP is sent to the relay exchange NP3.
R3 is given, and the loop release L in the line control section
PR will be held.

Based on these loop test reports, the network centralized control device NCC can determine which line system has a fault and isolate the fault location.

As a result of this loop test, it is possible to diagnose a fault by causing a diagnostic program to be executed on a portion where an abnormality has been found, for example, the relay exchange NP3, and returning the results.

Finally, the contents of the relay exchange in the remote control system for a data communication network according to the present invention will be explained based on FIGS. 6 and 7.

FIG. 6 is a block diagram of an embodiment of a relay exchange that is to be a component of a remote control system for a data communication network according to the present invention, and FIG. 7 is a circuit diagram of its loop gate.

Here, NP is a trunk exchange, CC is a processing unit, MM is a storage unit, LC is a line control unit, SP is a service processing unit, CC BUS is a processing unit bus, and SP BUS is a service processing unit. The control bus LG is a loop gate for each line, and LPS is a loop instruction signal line.

The processing post CC controls the entire relay exchange NP.
Usually, a built-in program control method is used, and this control program is taken in from the storage section MM via the processing section bus CC BUS.

The line control unit LC executes interface control with the trunk line TL and subscriber line SL, such as serial-to-parallel conversion, according to instructions from the processing unit CC.

The service processing unit SP receives an instruction signal from the control line CL, and at the time of a loop test, sends a loop instruction signal to the loop gate LG via the loop instruction signal line LPS via the processing unit bus SP BUS. L
G is set in a loop state, loop test data is sent out, the returned data is compared and verified, and the results are returned to the network central control unit MCC through the control line CL.

Further, when a diagnostic program test instruction is received from the control line CL, each function of the relay exchange NP is tested by the diagnostic program, and the results are returned to the network central control unit NCC.

As shown in FIG. 7, the loop game LG consists of AND gates GS1, GS2, GRI, and GR2.

When there is no loop instruction signal on the loop instruction signal line LPS, only the AND gates GS1 and GRI are open.
Both ends of the transmitting/receiving data line SDI, SD2 and RD1,
RD2 becomes a through line and signals are sent and received with each line, but when a loop instruction signal is given, only AND gates GS2 and GR2 are opened, and the gates RD1 and RD1 are connected to each other at both ends of the sending and receiving data line. →SD1 ,SD2→RD2
A return signal path is created on the side of the trunk line TL or subscriber line SL and on the side of the line control unit LC, and these are separated to enable a loop test.

As explained above in detail, according to the present invention, even when simultaneous failures occur in the trunk line system, maintenance personnel are dispatched to perform manual loop tests, etc., and it takes a long time to isolate and repair the failure part. The failure location can be isolated by implementing a remote loop test and remote inquiry program from the network central control device, which shortens failure recovery time and saves maintenance staff time. Man-hours can also be reduced, and significant effects can be obtained in improving the serviceability of data communication networks and reducing maintenance and management costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of a conventional remote control method for a data communication network, FIG. 2 is a sequence diagram for diagnosis, and FIG. 3 is an embodiment of a remote control method for a data communication network according to the present invention. 4 is a sequence diagram of the diagnosis, FIG. 5 is a sequence diagram of the remote loop test, and FIG. 6 is a relay exchange that is to be a component of the remote control system of the data communication network according to the present invention. FIG. 7, a block diagram of one embodiment of the present invention, is a circuit diagram of the loop gate. NCC・・・Network centralized control device, NP,
NP1 to NP5...Relay exchange, H...
・Host computer, T...Data terminal, T
L12, TLI 4 , TLI 5 , TL23 , T
L25, TL42, TL45, TL53...
...Relay line, CL, CL1 to CL5...Control line, SL...Subscriber line, CC...
Processing unit, MM...Storage unit, LC...Line control unit, SP...Service processing unit, CC B
US... Processing unit bus, SP BUS...
・Service processing unit control bus, LG...
Loop gate, LPS...Loop instruction signal line.

Claims (1)

[Scope of Claims] 1. In a remote control system for a data communication network having a network central control device that connects relay exchanges through a relay line network and centrally controls them, the network central control device connects directly to each relay exchange. A control line is provided, and an inquiry message is transmitted from the network central control device to an arbitrary relay exchange through the corresponding control line, and the relay exchange receives the inquiry message. is sent to the trunk line or subscriber line related to the trunk exchange, receives a response message from the trunk exchange or data terminal, analyzes these, edits the response message, and transmits the message to the network through the control line. The network central controller analyzes the response message and, if necessary, also performs a loop test on the trunk line or subscriber line to the trunk exchange through the control line. 1. A remote control method for a data communication network, characterized in that the system remotely controls the data communication network by causing the execution of diagnostic programs and the execution of diagnostic programs, and returning the results through the control line. 2. In the device described in claim 1, the transit exchange has a service processing section, which receives an inquiry message, a loop test instruction, and a diagnostic program execution instruction from the control line, and executes and processes them. A remote control method for data communication networks. 3. In the device described in claim 2, when the service processing unit receives a loop test instruction, it provides a corresponding loop instruction signal to the line control unit and the loop gate inserted between each line, A remote control method for a data communication network in which the line control unit and each line are looped back and separated.