JPS58182988A - Remote file transfer system - Google Patents

Abstract

PURPOSE:To reduce the time required for retransmission processing and to decrease the transfer loss of a remote file transfer system, by performing detection of a failure of transmission control and the retransmission processing accompanied with the generation of a failure of transmission control by a block of a small scale group. CONSTITUTION:A master station exchange 1 and a remote station exchange 2 are connected with a transmission line 3, the remote file transfer instruction from a type TTY is received at a central controller CP of the exchange 1, and the content of one block of a backup memory file BFM is added with a start address and transferred to the exchange 2. The exchange 1 transmits the content of the file BFM to the exchange 2 sequentially one by one block. The information is decoded at a remote station control circuit RCTL receiving this information, information relating the self-control devices is applied to a self-control circuit 4 to control a line concentrator LSW and a subscriber line LC. The control circuit 4 performs the detection of a fialure in the transmission control and the retransmission processing accompanied with the generation of the fialure in a block of small scale group, allowing to reduce the time required for the retransmission processing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a remote file transfer method, in particular, when the master exchange is connected only through a transmission line and control from the master exchange is impossible due to a failure of the transmission line, etc. The present invention relates to a transfer control method for transferring programs and data from a master exchange to a main storage device in the autonomous control device in a remote station having an autonomous control device that controls processing connections.

Conventionally, as the object of the present invention, the main storage device in a remote central office switch is configured with a read/write memory, the backup file of the main storage device is held in the master central office switch, and the TLL information of the cough backup file is transmitted via a transmission path. In a remote station switching system in which a remote station autonomous control device is started up by writing data into the main storage device, the following method is used as the file transfer means.

In other words, in order to detect a transmission control abnormality that occurs during information transfer (such as an abnormality in the transmission protocol or an abnormality due to a hardware failure), information transferred from the master station to the remote station is returned from the remote station to the master station. In this method, the two pieces of information are compared at the master station to detect an abnormality.

However, in this method, the amount of information transferred between the master station and remote station is 2.
This is a transfer method with a slow transfer speed, and abnormal conditions occur with a very low probability, so adopting the above method for such a phenomenon would have an interlayer that would lead to a decrease in efficiency. ft-.

There is also another system that focuses on the fact that the probability of occurrence of an abnormal state is small and uses a method that detects whether a mosquito state has occurred at the end of the transfer.

However, this method also has a sufficiently low probability, and this method
Once an abnormal condition occurs, all information will be sent again. Therefore, this system is also found to be an inefficient system when abnormal conditions occur and retransmission processing is considered.

The purpose of the present invention is to connect the master exchange to the transmission line only,
Normally, call processing connection is performed via the transmission path under the control of the master exchange, and when the transmission path fails, it is controlled by an independent autonomous control device, and the autonomous control device has a readable memory as the main storage device. In a remote exchange controlled by a central control unit, remote file transfer with less transmission loss in a transmission control means including retransmission processing when transferring a remote exchange processing program and data from the master exchange to the main storage device. The purpose is to provide a method.

According to the present invention, it is connected to a master exchange only by a transmission line, and normally a call processing connection is performed through the transmission line under the control of the master exchange, and when the transmission line fails, it is controlled by an independent autonomous control device and the autonomous In a remote central office switch controlled by a central control unit in which a control device has a readable memory as a main memory, a backup file for storing remote office exchange programs and data in the main memory is stored in the master central switch. The remote office exchange processing program, etc. in the cough file is divided into multiple blocks and transferred to the remote office exchange, and when transferring, the number of transferred information in the block is counted and stored, and the remote office exchange The remote station exchange has a write control circuit that receives the P-gram data and writes it to the main memory, and the write control circuit counts the received information in the block and sends it to the master exchange when the l block reception is completed. It is characterized by having a means for returning the cough counting result, and further comprising comparing the transfer information counting result and the received information counting result in the master exchange and retransmitting only the information in the current sending book when a transmission control abnormality is detected. Provides remote file transfer method.

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

FIG. 1 shows a bus configuration diagram of an embodiment of the remote file transfer system according to the present invention. In FIG. 1, 1 is a master exchange, 2 is a remote exchange 13 is a transmission line, and 4 is an autonomous control device. .

8UB is a subscriber telephone, LO is a subscriber circuit, LAW is a line concentrator, 0ODEO is an encoding/decoding circuit that encodes analog signals and decodes digital signals, and MUX.
is a multiplexing circuit %DMUX is a demultiplexing circuit, T8W is a time division exchange switch, OTL is a remote station interface circuit in the master station exchange, ROTL is a remote station control circuit, OF is a master station central control unit, and BFM is a remote station exchange A backup memory file that stores processing programs, etc., TTY is an IO device such as a typewriter, ROP is a remote station central control device in a remote station or autonomous control device, MM is the main memory of the remote station, MWE is the main memory MM This figure shows a memory write circuit that directly writes remote station exchange processing programs, etc.

The main station's central control unit OP is a typewriter TT from the maintenance personnel.
When a remote file transfer instruction is received via Y, the backup memory file BIF of the corresponding remote station is
Select the storage area in M and pull up the first block of information to the storage area within the device itself. Next, the write start address in the main memory device MM is added and transfer start control information is sent to the transmission line via the remote station interface circuit OTL. Thereafter, the remote station exchange processing blog is read word by word from the beginning from the storage area in the nuclear device and sent to the remote station interface circuit 0'f'L.

When the remote station interface circuit 0'L'L receives the transfer start control information, it initializes its own internal transfer counter and then sends the information to the remote station.

Also, when receiving exchange processing program information, the counter is updated.

Control information, program data, etc. on the transmission path are extracted under the control of the remote station control circuit ROTL. The remote station control circuit ROTL analyzes this received information, transfers autonomous device-related control information to the autonomous control device r#14, and directly drives target devices (LO, L8W, etc.) for subscriber control information.

When the memory ordinary circuit MWE receives the transfer start control information, it initializes the remote station central control unit ROP and the reception counter in its own device, and then sets the write start address in the information in the address register. When receiving exchange processing program information, it is directly written into the main memory device MM according to the address register, and then the address register and reception counter are updated. The above processing is performed for all program information in the book.

After sending the block money program information, the master station central control device CP sends transfer end control information. When receiving the control information, the remote station interface circuit OTL receives the value of the transfer counter, and the memory write circuit MWII receives the transfer end control information. Each counter value is returned to the parent station central control device OF.

The master station central control unit CP compares the two counter values, and when they match, it considers that the transmission control has ended normally and moves on to the next block sending process. If there is a mismatch, the process ends abnormally and moves to retransmission processing, in which only the information in the current block is retransmitted.

Furthermore, the retransmission process of the information in the current block is also started when an abnormality is detected in the transmission protocol on the transmission path or an abnormality is detected due to a hardware failure in each circuit.

When all blocks are successfully completed, remote file transfer completion control information is sent to the memory write circuit MWI, and file transfer control is ended. When the memory write circuit MWBj receives the remote file transfer completion control information, it activates the remote station central control unit ROP and causes it to execute an exchange process based on the transferred remote station exchange processing program. A well-known high level data link control (HDLO) is used as a transmission method for control information on the transmission path.

As explained above, the present invention detects a transmission control abnormality and performs retransmission processing in response to the occurrence of the abnormal state in a small group called a pull, thereby reducing the time required for retransmission processing in response to the occurrence of an abnormal state. A remote file transfer method with less loss can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an implementation of the remote file transfer method according to the present invention. l... Master exchange 2... Remote exchange 3... Transmission line 4... Autonomous control device

Claims (1)

[Scope of Claims] It is connected to a master exchange only by a transmission line, and normally a call processing connection is performed through the transmission line under the control of the master exchange, and when a failure occurs in the transmission line, it is controlled by an independent autonomous control device. In a remote office exchange in which the autonomous control device is controlled by a central control unit having a readable memory as a main storage, a backup file for storing remote office exchange processing programs and data in the main storage in the master exchange. The remote station exchange processing program, etc. in the armpit file is divided into multiple blocks and transferred to the remote exchange, and when transferred, the number of transfer information in the block is calculated by the number of stitches. It has a write control circuit that stores the program, receives the remote exchange processing program, etc. in the remote exchange, and writes it into the main storage device. It has a means for returning the counting result to the master exchange upon completion of reception, and further in the master exchange! Compare the transferred information counting results and the received information counting results? A remote file transfer method characterized by retransmitting only the information in the current transmission block when a transmission control abnormality is detected.