JPH05276169A - Communication network system - Google Patents

Abstract

(57) [Summary] [Purpose] To reliably notify a failed slave unit to the master unit and to reliably restore the system regardless of the failure status of the slave unit. [Structure] The master unit sends data to monitor loop system down. When the system down is detected, the failure is notified to the exchange through the D channel. The exchange uses the D channel to sequentially send commands to the slaves connected to each line control unit to confirm the operating state of the slaves.
Then, the faulty slave unit causing the system down is detected, and the replacement switch is controlled to disconnect the faulty slave unit from the B channel loop to form a new B channel loop. The parent device is notified of the failed child device, and the B channel loop is reorganized and the loop is restored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication network system applied to a POS (point of sale information management) system, a LAN (local area network) system, or the like.

[0002]

2. Description of the Related Art In a conventional communication network system, as shown in FIG. 4, a master unit 1 and a plurality of slave units 2a, 2b, 2 are provided.
c, 2d, 2e, and 2f are line switching devices 3a and 4 respectively.
a, 4b, 4c, 4d, 4d, 4e, 4f are connected in a loop, and when the cordless handset 2b fails and the system goes down, the line switch 4b corresponding to the cordless handset 2b operates. As shown by the dotted line in the figure, the line input / output to / from the slave unit 2b is short-circuited to restore the loop.

[0003]

However, in the case where the corresponding line switching device operates on the slave unit side to restore the loop, it is difficult for the master unit to detect which slave unit has failed. Met. Further, there is a problem that the system goes down when a failure occurs in which the line switching device cannot be switched to restore the system loop on the slave side.

Therefore, the present invention is intended to provide a communication network system capable of surely notifying a failed slave unit to a master unit and capable of surely recovering the system regardless of the failure state of the slave unit. Is.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a master unit, a plurality of slave units, and a plurality of service integrated digital network interfaces, and two B channels of each interface are dedicated to input and output respectively. Channel, and a switching device that connects each base unit and each slave unit in a loop using each B channel. The master unit monitors the time when data returns around the loop line and returns to the slave unit. A means for detecting a system down due to a failure and a means for notifying the exchange of the system down when this means detects the system down are provided, and the exchange uses each of the D channels when the master notifies the system down. Check the operating status of the slave unit, and if it detects a failed slave unit, it disconnects the slave unit from the B channel loop, and the master unit has a faulty slave unit. It is provided with a means for notifying the up recovery.

[0006]

In the invention having such a structure, when a failure occurs in the child device and the system goes down, the parent device detects it and notifies the exchange. The exchange confirms the operating state of each slave unit using the D channel and detects the faulty slave unit. When a failed slave unit is detected, the slave unit is disconnected from the B channel loop, and the master unit is notified of which slave unit has failed and that the loop has been restored.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a master unit, 12a, 12
Reference numerals b, 12c, 12d, 12e, and 12f are slaves, and 13 is an exchange.

The exchange 13 has a plurality of line control units 14a, 14b, 14c, 14 having an integrated service digital network (hereinafter referred to as ISDN) interface.
d, 14e, 14f, 14g, 14h, exchange switch 1
5. CPU (central processing unit) that constitutes the control unit main body
16, ROM (Read Only Memory) 1 in which program data for controlling each unit by the CPU 16 is stored
7 and a RAM (random access memory) 18 used for data processing and the like.

The master unit 11 is connected to the line control unit 14a, and the slave units 12a to 12f are connected to the line control units 14b to 14g, respectively. The line control unit 14h is connected to the ISDN line 19.

The exchange switch 15 connects the B1 and B2 channels of each of the line control units 14a to 14h in a loop. That is, B of the line control unit 14a
2 channels are connected to the B1 channel of the line control unit 14b, B2 channels of the line control unit 14b are connected to the B1 channel of the line control unit 14c, and B2 channels of the line control unit 14c are connected to the B1 channel of the line control unit 14d. Then, the B2 channel of the line control unit 14d is connected to the B2 channel of the line control unit 14e, and the line control unit 14e
B1 channel of the line control unit 14f is connected to the B2 channel of the line control unit 14f, and the B1 channel of the line control unit 14f is connected to the B2 channel of the line control unit 14g.
The B1 channel of g is connected to the B2 channel of the line controller 14h, and the B1 channel of the line controller 14h is connected to the B1 channel of the line controller 14a.

As shown in FIG. 2A, the base unit 11 has
First, the line controller 14a transmits data to the B channel loop of the exchange 13 to monitor the system down of the loop. That is, an error timer is set until data returns through the loop, and if no data is returned before the error timer times out, a loop abnormality, that is, system down is detected. (Means for Detecting System Down) When the system down is detected, the switch 13 is notified of the failure through the D channel. (Means for notifying system down) In the exchange 13, as shown in (b) of FIG. 2, when there is a failure notice from the master 11, the CPU 16 uses the D channel to connect to the respective line controllers 14b to 14g. The commands are sequentially transmitted to the slaves 12a to 12f that are being operated, and the operating state of the slaves is confirmed. As a result, the child device causing the system down is detected. Exchange switch 13
Control the slave unit that causes the system to go down.
Separate from the channel loop to form a new B channel loop. (Means for disconnecting from B channel loop) Then, the master device 11 is notified that the slave device causing the system down and the B channel loop are reorganized and the loop is restored. (Means for informing loop recovery) As a result, the master device 11 confirms the recovery of the loop as shown in (a) of FIG.

In the embodiment having such a configuration, the base unit 11 transmits data to the B channel loop in the exchange 13 to monitor the system down of the loop. Then, for example, when an abnormality occurs in the child device 12b and the system goes down, the parent device 11 notifies the exchange 13 of the occurrence of the failure by using the D channel.

As a result, the exchange 13 uses the D channel to sequentially send commands to the respective slaves 12a to 12f to confirm the operating state of each slave. In this way, the failure of the child device 12b is detected. Subsequently, the exchange switch 15 is operated and the circuit in the exchange switch 15 is changed as shown in FIG. That is, the B2 channel of the line control unit 14b, the B1 channel of the line control unit 14c, the B2 channel of the line control unit 14c, and the B1 channel of the line control unit 14d are separated, and the B2 channel of the line control unit 14b is newly added. It is connected to the B1 channel of 14d. In this way, the child device 12b is separated from the loop, and a B channel loop excluding the child device 12b is formed.

Then, the exchange 13 notifies the master 11 of the slave 12b causing the system down and also the recovery of the loop.

In this way, the exchange 13 receives the failure notification from the master 11 and can detect the slave causing the system down and notify the master 11 so that the master 11 can confirm the faulty slave. You will be able to know it and be able to deal with the failure promptly.

Further, since the exchange 13 receives the failure notification from the master 11 and restores the loop, the system can be surely restored no matter what failure occurs in the slave.

[0018]

As described above in detail, according to the present invention, it is possible to surely notify the master unit of a faulty slave unit,
Moreover, it is possible to provide a communication network system capable of surely recovering the system regardless of the failure state of the slave unit.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing main processing in the same embodiment.

FIG. 3 is a system configuration diagram showing an example of loop recovery in the same embodiment.

FIG. 4 is a system configuration diagram showing a conventional example.

[Explanation of symbols]

11 ... Parent machine, 12a-12f ... Child machine, 13 ... Exchange machine, 1
4a to 14h ... Line control unit, 15 ... Exchange switch, 16
... CPU, 17 ... ROM.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location H04M 3/08 8426-5K 8948-5K H04L 11/02 Z

Claims (1)

[Claims] 1. A master unit, a plurality of slave units, and a plurality of service integrated digital network interfaces, and two B channels of each interface are dedicated for input respectively.
It consists of an output-only communication channel, and an exchange that connects the master unit and each slave unit in a loop using each of the B channels. The master unit determines the time for data to be returned around the loop line. A means for monitoring and detecting a system down due to a failure of the slave unit, and a means for notifying the exchange of the system down when the means detects the system down, the exchange is notified of the system down from the master unit. And D channel are used to check the operating state of each slave unit, and when a faulty slave unit is detected, means for disconnecting the slave unit from the B channel loop, and notification of loop recovery to the master unit together with the faulty slave unit A communication network system characterized by comprising means for performing.