JPH06104924A - Backup system for relay line - Google Patents

Abstract

PURPOSE:To back up a relay line by utilizing a public packet exchange network with respect to the backup system when an inter-node relay line is faulty in a private packet exchange network. CONSTITUTION:When a call between nodes is set up in a private packet exchange network and an opportunity of bypassing takes place in a relay line 3, a packet exchange 1 being a caller terminal equipment accommodation node converts a called terminal equipment number specific to the private packet exchange network in a CR packet from the caller terminal equipment into an exchange network subscriber number of a public packet of a packet exchange 2 being a called terminal equipment accommodation node and sends the converted packet to a public packet exchange network 7. The communication with the called terminal equipment is continued by using the public packet exchange network 7 for the relay line so as to set up the call between the nodes in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup system in the case of a failure of a relay line between nodes in a private packet switching network, and more particularly to a backup system of a relay line for backing up using a public packet switching network (PSPDN). Is.

In a private packet switching network,
A relay line is provided between the packet switches, and data is transferred by connecting the nodes via the relay line.

In such a private packet switching network, it is desired to reduce the operating cost at the time of backing up the relay line by using the public packet switching network as a backup relay line when the trunk line fails. There is.

[0004]

2. Description of the Related Art Conventionally, a method of backing up by using a public circuit switching network has been adopted when an internode relay line in a private packet switching network cannot be used due to a failure or the like.

FIG. 5 shows an example of a trunk line backup system in a conventional private packet switching network, which is a system using a public ISDN circuit switching network, wherein 1 and 2 are packet switches 1-1. , 2-1 are terminals of the packet switches 1 and 2, 3 are trunk lines, 4 is a public ISDN circuit switched network, 5 and 6 are terminal adapters (T).
A).

In FIG. 5, the nodes (packet switches 1 and 2) and the public ISDN circuit switching network 4 are external T
It is connected via A5 and A6. In TAs 5 and 6, the joining numbers of the destination nodes in the public ISDN network exchange are registered in advance.

When the originating node detects a trunk detour trigger due to a cause such as a failure or congestion of the trunk, by controlling the TA, the TA is directed to the destination node by the public IS.
The call is automatically sent to the DN circuit switching network 4. On the other hand, the TA on the destination node side automatically receives the call, thereby establishing the backup transmission path.

Thereafter, the public ISDN circuit switching network can be used as an alternative to the trunk line to transfer data, and the trunk line 3 is backed up.

[0009]

In a circuit switching network such as a public ISDN circuit switching network, the connection time of the circuit is charged and the charging system is different from that of the packet switching network. Therefore, if the trunk line of the private packet switching network is backed up using the public line network, a charge will be added even for the time when the data transfer is not performed, resulting in a high operating cost. .

The present invention is intended to solve the problems of the prior art as described above, and uses a public packet switching network (hereinafter abbreviated as PSPDN) that charges according to the amount of transferred data, as an alternative to the trunk line. It is an object of the present invention to provide a trunk line backup system in a private packet switching network, which reduces the operating cost by using it.

[0011]

[Means for Solving the Problems]

(1) FIG. 1 shows the basic configuration of the present invention. The trunk line backup method of the present invention is such that, when a call is made across nodes in a private packet switching network and a detour trigger occurs on the trunk line 3, the packet switching device 1 serving as the source terminal accommodating node C from calling terminal 1-1
The packet switch 2 that uses the destination terminal number unique to the private packet switching network in the R packet as the destination terminal accommodation node
To the public packet switching network 7 by making a call to the public packet switching network 7 and establishing a call between the nodes by using the public packet switching network 7 as a substitute for the trunk line. It enables communication between them.

(2) In addition, in the trunk line backup method of the present invention, in (1), the packet switch 1 serving as the source terminal accommodating node in the private switching network causes a detour trigger due to a failure or congestion of the trunk line 3. The detour opportunity detecting means 200 for detecting the detour opportunity, and the number converting means 1 for converting the called number in the CR packet into the subscription number of the public packet switching network 7 of the packet switch 2 serving as the destination terminal accommodating node when the detour opportunity is detected.
00 and the unique number notifying means 300 for setting the called number to the called extension number in the CR packet, and the packet switch 2 serving as the called terminal accommodating node uses the called number in the CN packet from the public packet switching network 7. Is provided with a unique number detecting means 400 for detecting.

(3) Further, the packet switch of the present invention is (1)
At the time of occurrence of the trunk line detour trigger, the packet switch 1 serving as the source terminal accommodating node in the private packet switching network uses the destination terminal number peculiar to the private packet switching network in the CR packet as the public address of the packet switch 2 serving as the destination terminal accommodating node. It is provided with a number conversion function for converting a packet switching network subscription number.

[0014]

FIG. 2 shows a private packet switch to which the present invention is applied, and illustrates the operation of the present invention. In the figure, 1 is a packet switch, 1-1, 1
-2, ..., 1-n are private packet network unique numbers of the respective terminals connected to the packet switch 1.

In the packet switch 1, 100 is number conversion means, 200 is detour trigger detection means, and 300 is P
A unique number notifying means for notifying a private packet network unique number at the time of SPDN connection, 400 is a unique number detecting means for detecting a private packet network unique number at the time of PSPDN connection, and 500 is a number conversion table used in the number converting means 100. .

When the detour opportunity detecting means 200 detects a detour opportunity of a trunk line such as a failure, the number converting means 100
Call request (CR) by referring to the number conversion table 500
The private packet network unique number set as the called number in the packet is converted into the PSPDN subscription number of the destination node.

Unique number notifying means 300 in the calling node
C to identify the destination terminal at the destination node
The private packet network unique number of the destination terminal is set to the extension number in the R packet.

Unique number detecting means 400 at the destination node
Is the destination extension number of the incoming call (CN) packet received from the PSPDN, and when the private packet network unique number of the destination terminal is detected, the destination number of the CN packet to be sent to the destination terminal is added to the destination terminal. Set the private packet network unique number.

Therefore, when a detour factor occurs in the relay line in the private packet switching network, the data transmission can be performed by setting the transmission line using the PSPDN as the backup relay line.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an embodiment of the present invention, in which reference numerals 1 and 2 denote packet switches, 1-1, 1-2, ...
1-n is a private packet network unique number of each terminal of the packet switch 1, and 2-1, 2-2, ..., 2-n are private packet network unique numbers of each terminal of the packet switch 2.

In the packet switch 1, 11 is a processing unit, which is a number conversion means 101 and a detour opportunity detection means 20.
1, unique number notifying means 301, unique number detecting means 401
have. Reference numeral 12 is a storage unit, which has a number conversion table 501.

In the packet switch 2, a reference numeral 21 is a processing unit, which is a number conversion means 102 and a detour opportunity detection means 20.
2, unique number notifying means 302, unique number detecting means 402
have. Reference numeral 22 denotes a storage unit, which has a number conversion table 502.

Number conversion means 101, 102, detour opportunity detection means 201, 202, unique number notification means 301, 30
2, the unique number detecting means 401, 402 and the number conversion tables 501, 502 are respectively the number converting means 100, the detour opportunity detecting means 200, the unique number notifying means 300, the unique number detecting means 400, and the number conversion table 5 in FIG.
It corresponds to 00.

The packet switch 1 has a PSPDN subscriber number XYZ-1, and the packet switch 2 has a PS
Suppose you have a PDN subscriber number XYZ-2.

Hereinafter, the terminal having the number 1-1 is referred to as the number 2
A case of making a call to a terminal having -1 will be described as an example. FIG. 4 shows a connection sequence at the normal time and at the time of backup, (a) shows the normal time,
(B) shows the time of backup.

In normal times, the terminal 1-1 sets the destination terminal number 2-1 as the destination number of the CR packet and sends it to the node (packet switch 1). In the exchange 1, the processing unit 11 numerically analyzes the destination number 2-1 of the CR packet, recognizes that it is a terminal in the packet exchange 2, and sends the CR packet to the node (packet exchange 2) via the trunk line 3. Send to. Packet switch 2 is called number 2
-1 detects the receiving terminal 2-1 and sends C to the terminal 2-1.
Send N packets.

When the terminal 2-1 receives the CN packet, it returns an incoming call acceptance (CA) packet to the node (packet switch 2). The packet switch 2 completes the connection (C
C) The packet is sent to the node (packet switch 1) via the trunk line 3. The packet switch 1 sends the CC packet to the terminal 1-1, and the transmission path is thereby established. Therefore, from the terminal 1-1 onward, the packet switching apparatus 1 uses the same path.
A data (DT) packet is sent to -1.

At the time of backup, the terminal 1-1
Sets the destination number of the CR packet to 2-1 and sends it to the node (packet switch 1). In the packet switch 1, the processing unit 11 numerically analyzes the destination number 2-1 of the CR packet and recognizes that it is a terminal in the packet switch 2.

When the detour trigger recognition means 201 recognizes that a detour factor has occurred in the trunk line 3, the number conversion means 101 refers to the number conversion table 501 and corresponds to the private packet network unique number 2-1. PSP
The DN subscription number XYZ-2 is detected, and XYZ-2 is set as the called number in the CR packet.

Further, the unique number notifying means 301 is CR
The destination extension number in the packet is the calling terminal number 1-1 and the destination terminal number 2-1 which are the private packet network unique numbers.
According to the format. After that, the node is the corresponding CR
The packet is sent to the connection line for PSPDN7.

The node (packet switch 2) is
When the CN packet is received from N7, the unique number detecting means 402 in the processing unit 21 causes the calling terminal number 1-
1. Detect the receiving terminal number 2-1 and send a CN packet to the terminal 2-1.

When the terminal 2-1 receives the CN packet, the terminal 2-1 returns the CA packet to the node (packet switch 2), and the packet switch 2 sends the CA packet to the PSPDN 7. Further, a transmission path is established by sending CC packets from the PSPDN 7 via the node (packet switch 1) and sending CC packets from the packet switch 1 to the terminal 1-1.

Therefore, according to the trunk line backup method of the present invention, when a call across nodes is set up in a private packet switching network, when a detour trigger due to a failure or congestion of the trunk line occurs. , The calling node converts the called number of the CR packet from the called terminal number peculiar to the private packet network to the called PSPDN subscription number of the called node to call the PSPDN, and uses the PSPDN as an alternative to the trunk line to connect between the nodes. It is possible to establish a call and perform data transfer between terminals.

[0034]

As described above, according to the present invention, in the private packet switching network, the public packet switching network can be used as a substitute for the trunk line as a backup in the case of a failure or congestion of the trunk line. Therefore, it becomes possible to avoid an increase in operating cost due to the difference in the charge system when the trunk line is backed up.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention.

FIG. 2 is a diagram showing a private packet switch to which the present invention is applied.

FIG. 3 is a diagram showing an embodiment of the present invention.

FIG. 4 is a diagram showing a connection sequence at a normal time and a backup time, in which (a) shows a normal time and (b) shows a backup time.

FIG. 5 is a diagram showing an example of a trunk line backup method in a conventional private packet switching network.

[Explanation of symbols]

 1 Packet Switch 1-1 Originating Terminal 2 Packet Switch 2-1 Destination Terminal 3 Trunk Line 7 Public Packet Switching Network 100 Number Converting Means 200 Detour Triggering Detecting Means 300 Unique Number Notifying Means 400 Unique Number Detecting Means

Claims (3)

[Claims] 1. When setting up a call across nodes in a private packet switching network, when a detour trigger occurs on a trunk line (3), a packet switching device (1) serving as a source terminal accommodating node sends a call. The public packet switching network (7) is obtained by converting the destination terminal number unique to the private packet switching network in the CR packet from the terminal (1-1) into the public packet switching network subscription number of the packet switching device (2) which is the destination terminal accommodating node. By making a call between the nodes and establishing a call between the nodes by using the public packet switching network (7) as an alternative to a trunk line, thereby enabling communication with the destination terminal (2-1). Backup method for trunk lines. 2. A detour trigger detecting means (200) for detecting a detour trigger due to a failure or congestion of a trunk line (3), the packet switch (1) serving as a source terminal accommodating node in a private exchange network, When the detour trigger is detected, the number conversion means (1) that converts the destination number in the CR packet into the subscription number of the public packet switching network (7) of the packet switch (2) serving as the destination terminal accommodating node.
00) and a unique number notifying means (300) for setting the called number to the called extension number in the CR packet, and the packet switch (2) serving as the called terminal accommodating node is a public packet switching network (7). 2. The trunk line backup system according to claim 1, further comprising: a unique number detecting means (400) for detecting the called number in the CN packet from. 3. The trunk line backup system according to claim 1, wherein when a trunk line detour trigger occurs, the packet switch (1) serving as a source terminal accommodating node in the private packet switch network is a private packet switch network for CR packets. A packet switch having a number conversion function for converting a unique destination terminal number into a public packet switching network subscription number of a packet switch (2) serving as a destination terminal accommodating node.