JPH0234504B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a centralized maintenance system for remote maintenance of a digital switching system using a storage program control system, and particularly to a system for centrally monitoring software runaway.

(2) Background of the technology In digital switching systems based on the storage program control method, it is necessary to monitor not only maintenance information regarding devices such as alarm signals and status signals, but also program runaway.

(3) Conventional technology and problems As shown in Figure 1, in the conventional centralized maintenance system, only status information and alarm information are centrally monitored, and if the basic program on the exchange side runs out of control, each exchange is performed separately. This was done within the bureau. That is, the switching center LS connects the network circuit 1 and
A processor 2 that controls this, a digital terminal 4 that sends the output of the network circuit 1 to the digital transmission line 3, a counter 5, and an amplifier 6.
and a warning lamp 7, and the digital transmission line 3 is connected via a relay station 8 to a data link interface 9 in the centralized maintenance center CS.
Maintenance information regarding the equipment, such as alarm signals and status signals, is transferred from each exchange to the centralized maintenance center CS using one channel on the digital transmission line 3. That is, one channel for this maintenance information connects the exchange and the centralized maintenance center via a hotline. On the other hand, as for the runaway of the program related to the control of the processor 2, a counter 5 inside the exchange is used. The processor 2 controls the network circuit 1 and sends a clear signal CLR at a constant cycle to the counter 5 while the program is running normally. Counter 5 is a clear signal
It is designed to overflow at a cycle longer than the CLR cycle, and is reset by the reset signal CLR. Therefore, when the clear signal CLR is no longer generated, the counter 5 overflows and the overflow signal OF is obtained at its output, and the overflow signal OF is on the one hand amplified by the amplifier 6 and lights up the alarm lamp 7, and on the other hand, Switch the duplex processor 2. Next, restart processing such as debugging of the runaway program is executed.

However, according to the conventional example shown in FIG. 1, maintenance personnel must be assigned to each switching center to monitor program runaway, which is not only expensive, but also requires the central maintenance center to collect other alarm information and status information. There is a problem in that failure recovery can take a lot of time because analysis and comparison cannot be performed quickly.

(4) Purpose of the Invention In view of the problems with the conventional type described above, the purpose of the present invention is to centrally maintain the clear signal output from the processor together with other maintenance information such as status signals and alarm signals within the same channel of the digital transmission path. Based on the concept of transmitting data to the center, the central maintenance system aims to eliminate the need for software runaway monitors at each switching center and shorten the time required for fault recovery.

(5) Structure of the invention The gist of the present invention to achieve the above object is as follows:
A plurality of switching stations, a network circuit included in each of the switching stations, and a network circuit included in each of the switching stations that controls the network circuit and sends out a clear signal at a constant cycle when the basic software runs normally. a central maintenance center connected to each of the exchanges via a digital transmission line, and connecting at least one channel on the digital transmission line with a hot line to transmit alarm signals, status signals, etc. In a centralized maintenance system that transfers maintenance information, the clear signal is also included in the channel that transfers the maintenance information, and the centralized maintenance center detects the clear signal corresponding to each of the exchanges. The intensive maintenance method is characterized by comprising a signal detection means and an alarm generation means for generating an alarm when the signal detection means does not detect the clear signal of the fixed period.

(6) Examples of the invention Examples of the invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing a centralized maintenance system according to one embodiment of the present invention. In FIG. 2, the switching center LS ₁ does not include a counter 5, an amplifier 6, and an alarm lamp 7 as in the conventional example, and a clear signal CLR ₁ is output from the processor 2 at a constant cycle.
is inserted through the network circuit 1 and the digital terminal 4 into a channel into which maintenance information regarding the device, such as alarm signals and status information, is inserted together with these maintenance information, and then transmitted to the digital transmission line 3.
₁ , is input to the data link interface 9 in the centralized maintenance center CS ₁ via the repeater 8 ₁ . Similarly, a clear signal CLR _o is inputted from the other switching station L _o to the data link interface 9 in the centralized maintenance center CS ₁ via the digital transmission line 3 _o and the relay station 8 _o . At the centralized maintenance center CS ₁ , mono multivibrators 10 ₁ ,
..., 10 _o , amplifiers 11 ₁ ,..., 11 _o , alarm lamps 12 ₁ ,..., 12 _o , clear signal disconnection detection circuits 13 ₁ ,..., 13 _o , and alarm bells 14 ₁ ,..., 14 _o
It is equipped with The data link interface circuit 9 receives a clear signal from the digital transmission lines 3 ₁ ,..., 3 _o .
CLR ₁ , . . . , CLR _o are extracted and input to mono multivibrators 10 ₁ , . . . , 10 _o , respectively.

FIG. 3 is an output waveform diagram of one of the mono-multivibrator shown in FIG. In Figure 3,
Mono multivibrator 10 _i (i=1, 2,...,
or n) is triggered by the clear signal CLR _i , its output waveform rises, and falls after a certain period of time T. Therefore, while the clear signal CLR _i is being inputted at a constant cycle, the output of the mono multivibrator is repeatedly turned on and off at a constant cycle, and the alarm lamp 12 _i is repeatedly blinking. clear signal
When CLR _i is disconnected, the corresponding mono multivibrator 12 _i will not be triggered, so its output waveform will be fixed at a low level, the alarm lamp 12 _i will not light up, and on the other hand, the output of the clear signal disconnection detection circuit 13 _i will rise. Then ring the alarm bell _14i .

(7) Effects of the Invention As explained above, according to the present invention, in a centralized maintenance system, it becomes possible for the central maintenance center to centrally monitor software runaway at each exchange, so that software Not only is the system price reduced because runaway monitoring personnel are no longer required, but the time required for failure recovery is shortened because analysis and comparison with other maintenance information such as alarm signals and status information can be quickly performed.

[Brief explanation of drawings]

Figure 1 is a block diagram showing a conventional centralized maintenance system, Figure 2 is a block diagram showing a centralized maintenance system according to an embodiment of the present invention, and Figure 3 is one output of the mono-multivibrator shown in Figure 2. FIG. LS ₁ , LSn...Switching center, CS ₁ ... Centralized maintenance center, 1... Network circuit, 2... Processor, 3 ₁ , 3 _o ... Digital transmission line, 4... Digital terminal, 8 ₁ , 8 _o ... Relay station, 9 ... Data link interface, 10 ₁ , 10 _o ... Mono multivibrator, 11 ₁ , 11 _o ... Amplifier,
12 ₁ , 12 _o ... Alarm lamp, 13 ₁ , 13 _o ...
Clear signal disconnection detection circuit, 14 ₁ , 14 _o ... Alarm bell.

Claims (1)

[Claims] 1. A plurality of switching stations, a network circuit included in each of the switching stations,
A processor included in each of the exchanges and equipped with means for controlling the network circuit and sending out a clear signal at a constant period when the basic software is running normally; and a processor having one-on-one correspondence with each exchange. In a centralized maintenance system that includes a centralized maintenance center connected via each digital transmission path, and connects at least one channel on the digital transmission path as a hotline to transfer maintenance information such as alarm signals and status signals, The clear signal is also included in the channel for transmitting maintenance information, and the centralized maintenance center includes signal detection means for detecting the clear signal corresponding to each of the exchanges, and the signal detection means detects the clear signal at the fixed period. and an alarm generation means for generating an alarm when the clear signal is not detected.