JPS63312746A - Packet exchanging system - Google Patents

Abstract

PURPOSE:To shorten the communication impossible time of a terminal equipment generated in an accident generating time by using a public packet exchanging network in the bypass setting means of the accident time of the packet exchange of the packet exchanging network of a tree-shaped construction. CONSTITUTION:In a normal case, with routes 14 and 15 to pass through protocol converting devices 4 and 6 and packet switching devices 2 and 3, communication with a user center 1 is executed. Next, when the packet exchange 2, for example, is troubled by an accident, etc., the packet exchange 3 which is an alternative packet exchange retrieves its own data by a command, discriminates the protocol converting devices 4 and 5 connected to the packet exchange 2 and executes the setting processing of a communication path 17 via a public packet exchanging network 16 to the protocol converting devices 4 and 5. When the above-mentioned setting is completed, the alternative packet exchange 3 registers the protocol converting devices 4 and 5 on data and an accident detouring processing is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a detour control method in the event of a packet switch disaster in a tree-structured packet switch network.

〔overview〕

The present invention utilizes a public packet switching network in a disaster detour setting means for a packet switch in a tree-structured packet switching network, thereby making it possible to shorten the time during which terminal equipment is unable to communicate when a disaster occurs. It is.

[Conventional technology]

Conventionally, in this type of packet switching network, if a packet switch in the network was damaged, the protocol converter connected to that packet switch would install a new line to another packet switch, and At the exchange, changes were being made to the station conditions in order to place a new protocol converter under its own control.

[Problem that the invention seeks to solve]

The disadvantage of such a packet switching network is that if a packet switch in the network is damaged, the protocol converters under the damaged machine will stop operating for a long time until new lines to other packet switches in the network are installed. was there.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and to provide a packet switching system capable of shortening the downtime of the protocol converter when a packet switching system is damaged.

[Means for solving problems]

The present invention provides a packet switching system that includes a user center, a plurality of packet switchers connected to the user center, and terminals connected to the user center in a tree shape via the packet switchers. The user center is equipped with a protocol conversion means for the terminal device, which converts a protocol that defines the procedure for exchanging information between the terminal and the packet switch to a protocol that defines the procedure for exchanging information within the public packet switching network, and the user center a detection means for detecting that one of the packet switches has been damaged;
communication path setting means for setting up a communication path between a protocol converter housed in the packet switch whose damage has been detected by the detection means and another packet switch via the public packet switching network; The present invention is characterized by comprising a registration means for registering a protocol converter accommodated by the above-mentioned packet switch as a protocol converter accommodated by the above-mentioned packet switch.

[Effect]

If a packet switching equipment is damaged and stops functioning, a communication path is set up between the protocol converter connected to the damaged packet switching equipment and an alternative packet switching equipment via the public packet switching network, and a new alternative is established. Register the protocol converter connected to the packet switch as the protocol converter connected to itself.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figure shows the communication route in the packet switching network before implementing the detour control in the event of a disaster, and FIG. 2 shows the communication route in the packet switching network after the implementation of the detour control in the event of a disaster.

This embodiment includes a user center 1, packet switches 2 and 3 connected to the user center 1, and a user center 1.
Terminals 10 to 13 connected in a tree-like manner via packet switches 2 and 3, and terminals 10 to 1
3 and protocol converters 4 to 7, which are protocol conversion means for converting a protocol that defines a procedure for transmitting and receiving information between the packet exchangers 2 and 3 into a protocol that defines a procedure for transmitting and receiving information within a public packet switching network. The user center 1 has a detection means for detecting that one of the packet exchanges 2 and 3 has been damaged, and a protocol converter housed in the packet exchange whose damage has been detected by this detection means and other packet exchanges. a communication path setting means for setting a communication path between the two via a public packet switching network; and a registration means for registering a protocol converter accommodated by the packet switch where a disaster has been detected as a protocol converter accommodated by another packet switch. Be prepared. Terminal 10
is connected to protocol converter 4, terminal device 11 is connected to protocol converter 5, terminal device 12 is connected to protocol converter 6, terminal device 13 is connected to protocol converter 7, and protocol converter 4 and 5 is connected to the packet switch 2, protocol converters 6 and 7 are connected to the packet switch 3, packet switch 2 is connected to the packet switch 3, packet switch 3 is connected to the user center 1, and When performing detour control, the packet switch 3 is connected to the protocol converters 4 and 5 via the public packet switch network 16.

First, the normal operation of this embodiment will be explained based on FIG. Terminals 10 and 12 are connected to protocol converters 4 and 6, respectively, and protocol converter 4.
and 6 are connected to the user center 1 via routes 14 and 15 via packet switches 2 and 3, respectively.
is communicating with.

Next, disaster detour control when the packet switch 2 stops functioning due to a disaster or the like will be explained based on FIG. 2.

(2) When the packet switch 2 is damaged, the protocol converters 4 and 5 and the packet switch 3 detect the inability to communicate with the packet switch 2.

■ The protocol converters 4 and 5 connected to the packet switch 2 switch to a backup line in order to restore communication with the packet switch, but because the packet switch 2 has stopped functioning, they cannot communicate. Unable to restart.

■ Upon learning of the damage to the packet switch 2 through communication from the packet switch 2, the operator of the alternative packet switch issues an operation and maintenance command (hereinafter referred to as a command) to start a detour in the event of a disaster, specifying that the packet switch 2 has been damaged. throw into.

■ The packet switch 3, which is an alternative packet switch, searches its own data according to the command, identifies the protocol converters 4 and 5 connected to the packet switch 2, and converts the protocol converters 4 and 5 via the public packet switch network 16. The communication path 17 setting process is newly performed for the communication path 17.

(2) When the packet switching device 3, which is an alternative packet switching device, completes the setting of the communication path to the protocol converters 4 and 5, it registers the protocol converters 4 and 5 in the data, and ends the disaster detour process.

- When the disaster-affected packet switch 2 is restored, a command is issued to cancel the disaster detour to the substitute packet switch 3.

(2) The alternative packet switch 3 releases the communication path 17 via the public packet switch network 16 in response to the disaster detour release command, cancels the registration of the protocol converters 4 and 5, and returns to the normal state shown in FIG.

〔Effect of the invention〕

As explained above, when a packet switch in a network stops functioning, the present invention provides user terminals that are required until a new detour line is installed as in the past or the damaged packet switch is restored. This has the effect of significantly shortening this communication unavailable time compared to the communication unavailable time.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams showing the operation of the embodiment of the present invention. 1... User center, 2.3... Packet switch,
4-7...Protocol converter, 8...Relay line, 9
...Terminal line, 10-13...Terminal, 16...
Public packet switching network, 17...Detour communication channel in case of disaster. Patent Applicant: NEC Corporation − Agent: Patent Attorney Nao Ide Takajoki Route Diagram 1

Claims (1)

[Claims] (1) In a packet switching system comprising a user center, a plurality of packet switches connected to this user center, and terminals connected to this user center in a tree-like manner via the packet switches, the terminals The user center is equipped with a protocol conversion means for the terminal device that converts a protocol that defines the procedure for exchanging information between the packet exchanger and the packet exchanger into a protocol that defines the procedure for exchanging information within the public packet switching network. A communication path between a detection means for detecting that one packet switch has been damaged, a protocol converter housed in the packet switch whose damage has been detected by this detection means, and another packet switch is connected to the public packet switching network. and registration means for registering a protocol converter accommodated by the packet switch in which the disaster has been detected as a protocol converter accommodated by the other packet switch. Packet switching method.