JPS62169548A - Message delivery method from storage and forwarding device - Google Patents

Abstract

PURPOSE:To omit such a case where a message is transmitted again to a store and forward exchange device through a terminal at the transmitter side, by avoiding erasion of the message stored once in a store file device in case a repeating installation, such as exchange, has a trouble or the relaying is impossible. CONSTITUTION:In case all corresponding parts of transmission lines 71-7j have troubles in an exchange 2 or the relaying is impossible, the corresponding message is not transmitted to a terminal 41 at the receiver side until those troubles are all recovered. While the message stored in a store file device 11 is not erased. When those troubles are recovered, a store and forward exchange device 1 delivers the message stored in the device 11 as long as the terminal 41 is normal. Thus it is not needed for the terminal 41 to retransmit many times the messages to the device 1 even in case the repeating installation (include a connection device like a changeover switch, etc.) such as an exchange, etc., has a trouble or the repeating is impossible.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a message delivery method that takes into consideration the case where a message cannot be delivered to a receiving terminal by a storage and forwarding device, and particularly relates to a message delivery method that takes into consideration the case where a message cannot be delivered to a receiving terminal by a storage and forwarding device, and in particular, a message delivery method that takes into consideration the case where a message cannot be delivered to a receiving terminal by a storage and forwarding device. is connected via a relay device such as an exchange (including connection devices such as a changeover switch), the relay device may fail or the relay (connection
) A message delivery method using a storage and forwarding device suitable for when the storage/forwarding device is unable to do so.

[Background of the invention]

In the message delivery method of the conventional store and forward device, if the message cannot be delivered to the receiving terminal, for example, "Service Functions of New Facsimile Communication System and Its Applications" Business Communication, '84. Vol1.
21, Na7, p. 44-48, a method was adopted in which the child communication was sent back to the originating terminal, etc.

FIG. 5 is a system configuration diagram illustrating a conventional message delivery method of this type of storage and forwarding device.

In Fig. 3, 1 is a storage and forwarding device, 11 is a storage file device, 12 is a console, 2 is a switch, 31 to 3 m
, 41 to 4n are terminals, and 71 to 7j are transmission lines. Some of the terminals 41 to 4n shown in FIG. The connected store-and-forward system uses the following method.

For example, when the terminal 61 sends a message to the terminal 41, the sending terminal 51 sends the message to the storage and forwarding device 1, and the message is temporarily stored in the storage file device 11 in the storage and forwarding device 1. is,
Thereafter, the storage/exchange device #1 transmits the corresponding message stored in the storage/file device 11 to the receiving terminal 41 via the exchange 2. At this time, the receiving terminal 41
If the message cannot be delivered because the terminal is busy, has a problem, runs out of recording paper, etc., and if the message still cannot be delivered after a specified number of attempts, the corresponding message is deleted from the storage file device 11 and sent to the sending terminal 51. A method is used in which undelivered messages are returned to the storage and forwarding device 1, and undelivered messages are also output to the console 12 of the storage and forwarding device 1.

However, in this conventional method, if a relay device such as the exchange 2 (including connection devices such as a changeover switch) has a failure or is in a state where relay (connection) is not possible, even if the receiving terminal 41 is normal, Regardless, the message cannot be delivered, the message is deleted from the storage file device 11, and an unlucky message is output.As a result, the sending terminal 31 does not know the reason for non-delivery and sends the message again to the storage/exchange device. There were problems such as the need to send data to 1.

[Purpose of the invention]

The purpose of the present invention is to solve the problems of the prior art described above, and to solve the problems of the prior art described above.
If there is a failure or relay (connection) is not possible, there is no need for the sending terminal to send the message again to the storage and forwarding device without deleting the message once stored in the storage file device of the storage and forwarding device. The purpose of the present invention is to provide a method for delivering messages using a store-and-forward device.

[Summary of the invention]

The present invention provides a storage and forwarding system in which a storage and forwarding device is connected to at least some terminals via a relay device such as an exchange (including a connection device such as a changeover switch), in which the relay device such as an exchange Or, if relaying (connection) is not possible, a means is provided to detect the failure etc. on the storage and forwarding device, and messages sent to the receiving terminal connected via the relaying device that has failed or cannot be relayed. When the relay device has a failure or relaying is not possible, the stored file is not deleted from the storage and forwarding device and no notification of non-delivery is sent, and when the failure or relaying is not possible, the storage file is sent to the receiving terminal when the failure or relaying is not possible. This is a message delivery method for a storage and forwarding device that controls message delivery so that the corresponding message is sent.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a system configuration diagram showing an embodiment of a message delivery method using a storage and forwarding device according to the present invention. In FIG. 1, 1 is a storage and forwarding device, 11 is a storage file device, 1
2 is console% 2 is switchboard, 31~5m, 41~4
n is a terminal, 71 to 7j are transmission lines, 81 to 8j are fault notification signal lines, and 91 to 9j are fault detection devices. Some of the terminals 41 to 4n in FIG.
j is connected to the storage and forwarding device 1, and the remaining terminals 31 and
~3m are directly connected to the store-and-forward device. Corresponding to the transmission lines 71 to 7j between the storage and forwarding device 1 and the exchange 2, there are also fault notification signal lines 81 to 8j that notify of a failure or a state where relaying is not possible in the corresponding part of the transmission lines 71 to 7j in the exchange 2.
are provided in the storage and forwarding device 2, and fault detection devices 91 to 9j are provided in the storage and forwarding device 2 to detect signals on the fault notification signal lines 81 to 8j.

With this configuration, for example, when the terminal 31 sends a message to the terminal 41, the sending terminal 31 sends the message to the storage and forwarding device 1, and the transmitted message is sent to the storage file device in the storage and forwarding device 1. It is accumulated once. Thereafter, the storage and forwarding device 1 transmits the corresponding message stored in the storage file device 11 to the receiving terminal 41 via the exchange 2. However, when attempting to send this message, if it is detected from the fault notification signal lines 81 to 8j that all of the transmission lines 71 to 7j corresponding parts in the exchange 2 are faulty or cannot be relayed, The corresponding message is not transmitted to the receiving terminal 41 until at least one of the transmission lines 71 to 7j corresponding parts in the exchange 2 recovers from a failure or a state in which relaying is not possible, and the message is not stored in the storage file device 11. The corresponding message will remain without being deleted. After that, when the fault in at least one of the transmission lines 71 to 7j corresponding parts in the exchange 2 is recovered, at that point the storage and forwarding device 1 moves to the operation of delivering the corresponding message to the receiving terminal 41,
If the receiving terminal 41 is normal, it will send the message that was left in the storage file device 11 without being deleted, and if the receiving terminal 41 has a problem, it will perform the same process as the conventional method and then send a child notification. Do the following. Note that when the above-mentioned storage and forwarding device 1 attempts to transmit the corresponding message, if all of the transmission lines 71 to 7j corresponding parts in the exchange 2 have a failure or cannot be relayed, the terminal 41 connected via the exchange 2
All messages sent to ~4n are stored in storage file device 1.
Messages sent to the terminals 31 to 3m connected without going through the exchange 2 are sent in the same manner as in the conventional method, and if there is a failure in the receiving terminal 61 to 3m, Performs necessary processing and sends non-delivery communications.

In this embodiment, a fault on the exchange 2 side or a state where relaying is not possible is notified through the fault notification signal lines 81 to Bjk in response to a fault in the transmission lines 71 to 7j in the exchange 2, In addition, there is a method in which one signal line corresponds to a fault in the exchange 2 or a state in which relaying is not possible, and means is provided in the storage/forwarding device 1 to detect it. But that's fine. Also, the failure notification signal lines 81 to 8j are not provided, and the transmission lines 71 to 7j are
It is also possible to place a fault notification signal on the

FIG. 2 is a system configuration diagram showing another embodiment of the message delivery method of the storage and forwarding device according to the present invention. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same or corresponding parts, 21 is a changeover switch, 51 is a terminal, 6 is a public network, 101 is a switching notification signal line, and 111 is a switching detection device. Some of the terminals 41 in FIG. 2 are connected to the storage/exchange device rIL1 via a transmission line 71 via a changeover switch 21, and are also connected to the public network 6 via the changeover switch 21 so that they can communicate with that terminal 51. It is.

With this configuration, in order to connect the terminal 41 to the public network 6 side in the changeover switch 21, the switch A is connected to the contact point a2 from the a,
Can be switched to the side. At this time, in conjunction with switch A, switch B is connected to the contact side.

As a result, the switching detection device 111 provided in the storage and forwarding device 1 detects through the switching notification signal line 101 that the terminal 41 is connected to the public network 6 side.

The terminal 4 connected via the changeover switch 21 in this way
1 is connected to the public network 6 and the changeover switch 21 cannot be connected to the storage/exchange device 1, the data is stored in the storage file device #11 in the storage/exchange device 1 as shown in FIG. Messages sent to the terminal 41 are not sent and are left undeleted. Then switch 2
1, when the terminal 41 is connected to the storage and forwarding device 1 side,
At that point, the storage and forwarding device 1 transmits the corresponding message to the terminal 1.

Note that in this embodiment as well, the switching notification signal line 10 is
It is also possible to carry the switching notification signal on the transmission path 71 without providing the switching notification signal.

〔Effect of the invention〕

As described above, according to the message delivery method of the storage and forwarding device of the present invention, when a relay device such as an exchange (including a connection device such as a changeover switch) has a failure or is in a state where relay (connection) is not possible, the relay device is Messages sent to terminals connected to the storage-and-forwarding device via the storage-and-forwarding device are left undeleted and are delivered when the relay device's failure or relay-inability state is recovered, so the sending terminal can accumulate messages over and over again. This has the advantage that there is no need to retransmit data to the exchange device.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram showing one embodiment of a message delivery method of a store and forward device according to the present invention, FIG. 2 is a system configuration diagram showing another embodiment, and FIG. 5 is a system configuration diagram showing a message delivery method of a conventional store and forward device. It is a system configuration diagram illustrating a delivery method. 1...Storage and exchange device 11...Storage file device 12...Console 2...Exchange 21...Switch switch 31-3m, 41 ~4n, 51...Terminal 6...
...Public networks 71 to 7j...Transmission lines 81 to 8j...Fault notification signal lines 91 to 9j...
. . . Fault detection device 101 . . . Switching notification signal line 111 . . . Switching detection device Fig. 5

Claims (1)

[Claims] A storage and forwarding device that temporarily stores messages from a terminal and sends them to another terminal, and a store and forwarding device in which at least some of the terminals are connected via a relay device such as an exchange (including a connection device such as a changeover switch) In the system, by providing a means to detect when the above-mentioned relay device has a failure or becomes unable to relay (including connection), terminals that are connected via the relay device that has failed or become unable to relay (including connection) A message delivery method for a storage and forwarding device in which a message sent to a storage and forwarding device is not deleted from the storage and forwarding device and a non-delivery notification is not issued until a failure or a state in which relaying is not possible is recovered.