JPH01321797A - Private automatic branch exchange - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a fault that all the exchanging functions are stopped by monitoring the operation of a central processor CPR with plural distributed processors LPRs and forcibly actuating an emergency line connecting device CPR for power failure when all the LPRs decide that the CPR is abnormal. CONSTITUTION:The abnormality of CPR201 is monitored by periodically executing an operation test for the CPR with LPRs 202-2-202-n and 204-1-204-n using the same information exchange path. First, when LPRs 202 and 204 detect the abnormality of the CPR201 in abnormality informing information paths 225 and 226, the LPRs 202 and 204 send the information. A deciding device 208 obtains the AND of the information from all the LPRs 202 and 204 under the control of the CPR201 and actuates a DFT207 through a control information path 227 when all the LPRs inform the deciding device 208 of the abnormality of the CPR. Further, the state of a system becomes the same state as a power failure state by forcibly stopping the operation of the abnormal CPR.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applied to a distributed processing device (Line Processor).
r, hereinafter referred to as LPR)
t) regarding rivate []ranch Exchange (hereinafter referred to as PIIX).

Conventional technology In recent years, as the functions of private automatic branch exchanges have become more sophisticated, the scale of the programs that manage them has become much larger, and for this reason so-called distributed processing type PBXs, in which control devices are distributed, are often used. I've started to do that.

In addition, in order to prevent a failure that occurs in the peripheral devices or LPR of this distributed processing PBX from rendering the entire system inoperable, the central processing unit (Central Pro
A number of mechanisms have been devised to monitor these devices and handle failures using CPI+ (hereinafter referred to as CPI+). This is because it has become an important issue.

FIG. 3 shows a simple block diagram of a conventional distributed processing type PBX having this function.

In Figure 3, lot is the central processing unit (CPR), 10
2-1 to l02-n are extension distributed processing devices (hereinafter referred to as extension LPI'l) that control extension trunks, 103 is an extension trunk where extensions gather, and 104-1 to 104-m are control line trunks 105. A central office line LP R110 (5 is a communication path control unit that exchanges communication paths, and 107 is a communication path control unit that directly connects the extension line and the central office line without going through the communication path control unit 10G in the event of a power outage to ensure a minimum number of calls. 4- Power Failour Trunk (hereinafter referred to as f)
' F T), 111 is an extension line, 112 is a central office line, 1
13 is a short-circuit path in the event of a power outage on the extension side, 114 is a short-circuit path in the event of a power outage on the office line side, 121 is the extension ■, the PR conveys various information from the telephone to the CPR, and the CPR transmits various information for controlling the LPR. Inform the CPRIOI and the CPRIOI will call the extension LPR.
122 is the communication path side σ11 information path, 12;3 is the central office line LPR 104-
The information exchange path 124 between CPRIO1 is a PFT control information path.

Failure monitoring of peripheral equipment (for example, LPR) in the conventional PBX shown in Fig. 3 is an echo back test in which the information sent from the CPRIOl is sent back unchanged using the information exchange paths 121 and 123 between the CPRIOI and the LPR.
-1 Arithmetic test in which information sent from CPRIOI is subjected to certain calculations and sent back, L P R's RAM (R
A pattern test or the like can be considered in which a certain predetermined pattern is permanently stored in the cad 0nly Me+nory) area and it is confirmed whether or not it has been rewritten. In addition to these tests, whether or not a response is returned when a test is performed is itself a test of the normal operation of the peripheral device.

These tests detect failures in peripheral devices,
Disconnect only the faulty LPR.

This can be done by, for example, causing a failure or ignoring information from the PR. Failure handling that prevents failure from affecting the entire system in this way;
The reliability of this PBX as a system is increased by performing processing to guarantee /f) a low-limit communication path in the event of a failure such as a power outage using PFT.

Problems to be Solved by the InventionHowever, since the CPR is designed to monitor peripheral devices, it is impossible to detect failures that occur in the CPR itself.

The present invention has been made in view of the above-mentioned prior art, and
The purpose of the present invention is to provide a 14-in-1 automatic switching system with fault monitoring and processing functions that can respond to abnormal operation of equipment due to faults in the R itself.

Means for Solving the Problems In order to solve the above problems, the automatic private branch exchange of the present invention is a distributed processing type PBX equipped with the following machine (1Δ).

In other words, multiple LPRs supervise the operation of CI)R,
All of the multiple LPRs are equipped with a mechanism that forcibly shifts the system to power outage mode and activates the power outage emergency connection device (PFT) if the CPR is deemed to be abnormal. .

Function: With this configuration, at least the operation of the power outage emergency line can be ensured even when the CPR malfunctions, thereby avoiding the occurrence of a failure in which all exchange functions stop.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a distributed processing type PBX in one embodiment of the present invention. In Figure 1, 201~
207, 211-214 and 221-224 are 101-107 in Figure 2.111-114 and 121-1
24 and t) respectively. 'FiJ3 figures not shown are 208, 225-1 to 225-n, 226-1
~226-m.

It is 227. 208 is a determiner that establishes CPR abnormality information from the LPR, 225 is a CPR abnormality notification information path from the extension LPR 202, and 22 (3 is the central office line ■, P R2
The CPR abnormality notification information path 227 from 04 is the CPR2 when the I-regulator 208 is convinced that the CI)R20j is abnormal.
CP to establish a state where 01 is separated from the system
This is the forced control information path of R.

In the distributed processing type P13X of the present embodiment configured as described above and shown in FIG. 1, the flow chart in FIG. I will explain using

First, monitor abnormalities in CPR201 by monitoring LPR202 to 202.
2 +1 and 204-1 to 204-n receive control information from the CPR and send various information under normal operating conditions, and at the same time periodically perform operational tests of the CPR using the same information exchange path. (Step a)
). The method for this operation test is LPR using CPR.
Similar to fault monitoring, echo back tests, arithmetic tests, pattern tests of the CPR RAM area, etc. performed from the LPR can be considered. Furthermore, in addition to these operation tests, whether or not a response is returned when the test is performed is also a CPR test.
It can be a test of normal operation.

Next, in this test, LPR202 and 204 are
When it is confirmed that 0L is abnormal, the process moves from step b to step C, and the following series of operations are performed.

First, the LPRs 202 and 204 send information that an abnormality in the CPR 201 has been detected to the abnormality notification information paths 225 and 226. The Full controller 208 monitors all the LPRs 202 and 204 under the control of the CPR 201, that is, the LPR 202-1.
202-n and 204-1 to 204-, and if all LPR7'J<CPR abnormalities are notified, PFT2 is sent via control information path 227.
07 (step d) and activates the hold terminal of the CPR 201 and IC through the control information path 228, thereby setting the hold state in terms of hardware. By forcibly stopping the operation of the abnormal CPR, the system becomes similar to a power outage state. If the information from each LPR does not match, the process returns from step C to step a'\ and continues normal operation.

Effects of the Invention As described above, the present invention has the effect that the reliability of the PBX as a system can be improved because even when the CPR of a distributed PBX malfunctions, there is no problem of stopping all exchange functions. .

[Brief explanation of the drawing]

Figure 1 shows a distributed processing type 1) B in one embodiment of the present invention.
Figure 2 is a flowchart showing the operation flow of the same embodiment, Figure 3 is a conventional distributed processing type P
t) shows a simple block diagram of the BX. 201...CPR 2021-202-n-extension LPR 203...extension trunk 204 1-204-n =-office line LPR205...
- Office line trunk 206... Call path control unit 207 - P F'r 208... Abnormality information determiner 211... Extension line 212... Office line 213... Extension side power outage short circuit 214...・Station line side power outage short circuit path 221...Extension LPR-CPR information exchange path 222...
- Communication path control information path 223... Office line LPR-CPR information exchange path 224...
・PFT control information path 225...Extension CPR abnormality notification information path 227...P
FT control information path 228...Compulsory control information path agent's name Patent attorney Toshio Nakao Hakaichi Naro - Ichiuchi R
Trunk 20δ Fig. 2

Claims (1)

[Claims] (1) A central processing unit that controls the entire system, and processes such as monitoring the status of extension telephones and office lines, sending out bell signals to telephones, and detecting tone on office lines based on the instructions of this central processing unit. a plurality of distributed processing devices that perform communication, a communication path control unit that performs communication path switching control according to instructions from the central processing unit, and a communication path control unit that operates to directly connect an extension line and a central office line without going through the communication path control unit in the event of a power outage. an emergency line connection device for a power outage, a test means for monitoring a failure in the central processing unit from the plurality of distributed processing devices, and a notification when the plurality of distributed processing devices together detect an abnormality in the central processing unit. An automatic branch exchange, comprising an abnormality notification path and a control means for disconnecting a central processing unit from the system and shifting to a power outage mode upon receiving the notification.