JPS60264144A - Store and forward exchange method - Google Patents

Abstract

PURPOSE:To prevent missing data in a store and forward exchange network by preparing a transmission end signal waiting time counter to a sender store and forward exchange and providing a transmission end signal transmitting means to an incoming store and forward exchange. CONSTITUTION:The sender store and forward exchange 2 stores a received data in a storage device 3, transmits it to a relay store and forward exchange A4 and starts a transmission end wait time counter 10. The relay store and forward exchange A4 stores the received data to a storage device 5 and the data is transited to the incoming side store and forward exchange 7. If any fault takes place in the relay storage and forward exchange A4 and it is impossible to extract the data stored in the storage device 5, after a prescribed time is elapsed, the transmission end wait time counter 10 of the sender store and forward exchange 2 is activated, the sender store and forward exchange 2 transmits the data stored in the storage device 3 to a relay store and forward exchange B8, resets the transmission end wait time counter 10 for restart.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for preventing loss of data to be exchanged in a store-and-forward network.

[Prior art]

Conventionally, the storage and exchange method is as shown in Figure 199.
In the figure, (1) is a transmitting terminal that transmits data, (2
) is the originating store-and-switcher that accommodates the originating terminal, (3)
is a storage device for storing the data of the originating storage and switching device, (4
) is a relay storage/switcher A, (5) is a storage device for storing data of the relay storage/switcher, 悌) is a reception completion signal transmitting means for transmitting a reception completion signal of the relay storage/switcher, (7) is a receiving side storage/switcher, (8) is a relay storage/switcher B which is an alternative route to the relay storage/switcher A.

(9) is a receiving terminal that receives data.

Next, the operation number will be explained.

The originating terminal (1) sends data to the originating store and switch (2). The originating store and switch (2) stores the received data in a storage device (3) and then transmits it to the relay store and switch (4). The relay storage and exchange operator (4) stores the received data in the storage device (5), and then uses the reception completion signal transmitting means (6) to transmit the reception completion signal to the originating side storage percentage.
Ht to machine A (2). When the originating storage/switching device (2) receives the reception completion signal, it discards the data stored in the storage device (3). Thereafter, the relay storage/switcher A (4) transmits the data to the destination storage/switcher (7).

Since the storage and forwarding machine of the conventional store and forward method operates as described above, in FIG. 4) Some kind of failure occurs and the storage device (
5) If it becomes impossible to retrieve the data stored in B (8), the data will be transferred to relay storage and exchange B (8) as an alternative route.
2 does not arrive at the receiving terminal (9) even though it is prepared.

That is, the conventional store-and-forward network has the disadvantage that data to be exchanged is lost in the store-and-forward network if a failure occurs in one relay store-and-switch in the network.

[Summary of the invention]

The present invention has been made to improve these drawbacks by providing (1) a transmission completion signal waiting time counter in the originating storage/switching device and (2) providing a transmission completion signal transmitting means in the terminating storage/switching device.

This invention provides a store and forward method that prevents data loss within a store and forward network.

[Embodiments of the invention]

An embodiment of the present invention shown in FIG. 2 will be described below.

In the figure, (1) is the originating terminal, (2) is the originating storage/switching device, (3) is the storage device, (4) is the relay storage/switching device A,
+51 is a storage device, (7) is a storage and switching device on the receiving side, (8)
is transit exchange B which is an alternative route, (9) is the receiving terminal,
(10 is a transmission completion signal waiting time counter, (Iυ is a transmission completion signal transmission means.

Next, the operation will be explained.

The originating terminal (1) sends data to the originating store and switch (2). The originating storage/switching device (2) stores the received data in the storage device (3), transmits this data to the relay storage/switching device (4), and then starts a transmission completion waiting time counter. The relay store and switch operator (4) stores the received data in a storage device (5) and then transmits this data to the destination store and switch (7).

Here, if some failure occurs in the relay storage/switcher A (4) before the relay storage/switcher A (4) transmits the data to the destination storage/switcher (7), and the storage device (5)
) If it becomes impossible to retrieve the data stored in the storage/switching device (2), the transmission completion waiting time counter of the sending storage/switching device (2) is activated after a certain period of time has elapsed.

The originating storage exchange (2) transmits the data stored in the storage device (3) to the relay exchange B (8), resets the transmission completion waiting time counter, and restarts. The relay storage/switcher B (8) transfers the received data to the destination storage/switcher (
7) Send to. The receiving side storage/switching device (7) transmits the received data to the receiving terminal (9), and when receiving the reception completion signal from the receiving terminal (9), transmits the transmission completion signal transmitting means (I).
Using υ, a transmission completion signal is transmitted to the originating storage and exchange (2) via the relay storage and exchange B (8). When the originating storage/switching device (2) receives a transmission completion signal.

The transmission completion wait time counter is stopped and the storage device (3
) is discarded.

In addition, in the above embodiment, there are two relay storage and exchange machines, but
The present invention is applicable to a store-and-forward network having any number of relay store-and-switch devices greater than or equal to three.

〔Effect of the invention〕

Since the present invention operates as described above, even if a failure occurs in the relay store and switch in the store and forward network.

As long as there is an alternate route, data to be exchanged will not be lost within the store-and-forward network.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional store-and-forward network. FIG. 2 is a block diagram of an embodiment of the present invention. In the figure, (l) is the originating terminal, and (2) is the originating storage/switching device. (3), (5) are storage devices, (41, (81 are relay storage exchanges, (6) are reception completion signal transmitting means, (7) are receiving side storage exchanges, (9) are receiving terminals, and 00 are transmitters. The completion signal waiting time counter and aD are the transmission completion signal transmitting means. In Figure 1, the same or corresponding parts are indicated with the same symbols. Agent Masuo Oiwa

Claims (1)

[Scope of Claim] In a store-and-forward network in which multiple stages of store-and-switch devices relay data transmitted from two originating terminals in a store-and-forward manner and transmit the data to two terminating terminals. A time counter for waiting for a transmission completion signal is prepared in the storage/exchange that accommodates the originating terminal among the multiple stages of storage/exchange Q, and the transmission is completed to the storage/exchange that accommodates the terminating terminal among the multiple stages of storage/exchange. A signal transmitting means is prepared, and when the storage/exchange device accommodating the receiving terminal has successfully transmitted data to the receiving terminal, the transmission completion signal transmitting means is used to send a transmission completion signal to the calling terminal. A storage and forwarding method characterized by transmitting data to a storage and forwarding machine that accommodates the data.