JP2001136234A - Bulk transmitting device and auto fallback method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulk transmitting device and an auto fallback method which establish bulk communication with a normal line and reduce a transmission speed when a failure is caused in a used line. SOLUTION: In this bulk transmitting device, an auto fallback controlling part 16 judges which lines are a failed line and a normal line, notifies a bulk controlling part 12 of effective line information and speed information and also notifies a DTE interface part 14 of a transmission and reception data clamp control signal when the failure is caused in the line during bulk communication in which a plurality of lines are used. The part 12 establishes multiplex separation and bulk communication only with the normal lines according to the effective line information and also reduces the transmission speed of the frequency of a clock for transmission and reception according to the speed information at the same time. The part 14 performs clamp control of data for transmission and reception from the line failure occurrence till bulk communication establishment to the DTE side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to auto fallback control of a bulk transmission apparatus, and when a failure occurs in a used line, the transmission line is automatically established only with a normal line to reduce the transmission speed to be transmitted to the DTE side. The present invention relates to a bulk transmission device and an auto fallback method for maintaining communication by using a communication device.

[0002]

2. Description of the Related Art An example of a conventional fallback control system is described in Japanese Patent Publication No. Hei 5-33577. The fallback control system described in this publication is a system in which a modem (modem) on an analog line detects line deterioration and performs automatic fallback. The fallback control system uses a pair of opposing multiplex concentrators and a relay line to perform relaying. Multiplexed concentrators perform fallback control when detecting line communication degradation, and control to stop transmission signals output to the trunk line, and automatically perform fallback control when the opposite station stops transmission signals. It is. As a result, when the deterioration of the trunk line occurs, fallback control can be performed easily and in a short time.

[0003]

[Problems to be Solved by the Invention]
In the fallback control method described in Japanese Patent Application Laid-Open Publication No. H07-115, the transmission signal on the trunk line is stopped, so that the amount of data that can be transmitted is sometimes reduced. In digital line bulk transmission devices, there is no transmission device that performs the auto fallback method.

In the conventional bulk transmission apparatus, if any one of the used lines fails during the bulk communication using a plurality of lines, the bulk communication becomes impossible and the communication of the apparatus itself is interrupted. Had become. Here, in order to resume communication, the maintenance staff had to remove the faulty line, reduce the set speed, and re-establish synchronization. Also, when the failed line is restored normally, the maintenance staff needs to add a restored line, increase the set speed, and resynchronize. For this reason, when a line failure or line recovery occurs, system-based communication is interrupted until maintenance personnel resumes communication, and the effect on the system is great. The problem was how to shorten the communication interruption time when a line failure occurred.

An object of the present invention is to provide a DTE using a plurality of lines.
(Data Terminal Equipment:
Multiplexed data for the number of lines to the data terminal)
Also, in a bulk transmission device that separates data from the DTE into the number of lines and transmits the data to the line side, when a clock transmitted from the bulk transmission device is used for data transmission / reception with the DTE, any of the used lines is used. A bulk transmission device and an auto fallback that automatically establish bulk communication only on a normal line when a crab failure occurs, and simultaneously change the data transmission / reception clock transmitted to the DTE side to reduce the transmission speed and maintain communication. It is to provide a method.

[0006]

SUMMARY OF THE INVENTION A bulk transmission apparatus according to the present invention connects a terminal device, a plurality of lines and the terminal device, and, when a failure occurs in any of the lines, the line in which the failure occurred. A line other than the line, establishes line synchronization, and performs bulk communication for transmitting and receiving a large amount of data at a time, and monitors the state of each line of the plurality of lines and automatically adjusts the speed. It is characterized by.

[0007] Further, the bulk transmission apparatus is connected to the plurality of lines, interfaces data transmitted and received with the plurality of lines, detects a line failure of the line, and notifies the occurrence of the line failure; Sending and receiving line data through the line interface, and when a failure occurs in the line, a bulk control unit that transmits and receives the data to and from the terminal based on various types of information to be notified, the terminal device and the bulk control unit A data terminal interface unit for performing communication by lowering the transmission / reception speed of the data based on the notified information to the speed at the time of failure occurrence,
Obtain a notification of the occurrence of the line failure from the line interface unit, obtain information on an effective line in which a failure has not occurred among the plurality of lines from the notification, and obtain information on the effective line and the time of occurrence of the failure. An auto fallback control unit for notifying the bulk control unit of transmission / reception data speed information and notifying the data terminal interface unit of transmission / reception data control information.

An automatic fallback method in a bulk transmission apparatus according to the present invention detects occurrence of a failure in a communication line,
An auto fallback method in a bulk transmission apparatus for automatically resuming communication only on a normal line in which no fault has occurred. A) When it is detected that a fault has occurred in a plurality of communication lines, all faults are detected. And b) if the result of the determination indicates that all the lines are faulty, the communication is cut off. If the result of the determination indicates that all the lines are faulty, which communication line Acquiring valid line information as to whether or not the line is a valid line in which a failure has not occurred, and speed information which is information on the speed of transmission / reception data at the time of a failure according to the state of the valid line; c) the transmission / reception data amount D) a step of performing line synchronization only on the valid line from the valid line information, e) a step of releasing the restriction performed in step c, and f) a synchronization based on the speed information. Control the speed of the serial enable line, characterized in that it comprises a resume communication step.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the configuration of an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a diagram showing a configuration of a bulk transmission device of the present invention. FIG. 2 is a diagram showing a configuration of the bulk control unit of the present invention.

As shown in FIG. 1, the bulk transmission device includes a plurality of line interface units 10 and a bulk control unit 12.
And a DTE interface unit 14 and an auto fallback control unit 16. Here Bulk
k) Transmission means sending and receiving a large amount of data at a time, such as FTP or NFS.

Line interface units 10-1 and 10-
2, 10-3 or 10-4 is 1 for each line.
And an interface circuit for connecting the apparatus to a line and a circuit for monitoring a line state and generating a line failure detection signal when a line failure is detected.

The bulk control unit 12 includes a line interface unit 10-1, 10-2, 10-3 or 10-4 and a DT
A transmission / reception data demultiplexing circuit, a bulk frame transmission / reception circuit, and a transmission / reception clock generation circuit are connected to the E interface unit 14. Bulk controller 12
Receives valid line information and speed information from the auto fallback control unit 16. When the line synchronization with the auto fallback control unit 16 is established, the bulk control unit 12 notifies the auto fallback control unit 16 of a line synchronization establishment signal. The valid line information is information on a normal line in which no failure has occurred when a failure occurs in the line. The speed information is information on the speed of transmission / reception data when a failure occurs, when a part of the data is restored after the failure occurs, or when the data is normal.

The DTE interface section 14 has an interface circuit for connecting the present device to the DTE and a control and clamp circuit for DTE interface signals. The DTE interface unit 14 is the bulk control unit 1
2 and DTE, and the auto fallback control unit 1
6 is received. The auto fallback control unit 16 receives a line fault detection signal from the line interface unit 10-1, 10-2, 10-3 or 10-4 and sends valid line information and speed information to the bulk control unit 12. It has a circuit for transmitting a transmission / reception data clamp control signal to the transmission DTE interface unit 14.

As shown in FIG. 2, the bulk control unit 12
Multiplexing section 18, separating section 20, bulk frame receiving section 2
2, a bulk frame transmission unit 24, and a transmission / reception clock generation unit 26.

The multiplexing unit 18 includes a circuit for multiplexing data from each of the line interface units 10-1, 10-2, 10-3 or 10-4 in accordance with valid line information from the auto fallback control unit 16, and a transmission / reception unit. Clock generator 2
And a circuit for transmitting the received data to the DTE interface unit 14 or the bulk frame receiving unit 22 in accordance with the transmission / reception clock from the receiver 6. The demultiplexing unit 20 controls each of the line interface units 10-1, 10-2, 10-3 or 1 according to the valid line information from the auto fallback control unit 16.
It has a circuit for separating data into 0-4, and a circuit for taking in transmission data from the DTE interface unit 14 in accordance with the transmission / reception clock from the transmission / reception clock generation unit 26.

The bulk frame receiving unit 22 receives and checks a line frame for establishing line synchronization in accordance with the valid line information from the auto fallback control unit 16, and when line synchronization is established, the bulk frame for line synchronization establishment automatically falls back. There is a circuit for notifying the control unit 16 as a line synchronization establishment signal. Bulk frame sending unit 24
Has a circuit for transmitting a line synchronization establishment bulk frame to an effective line according to the effective line information from the auto fallback control unit 16. The transmission / reception clock generator 26 includes:
The transmission / reception clock has a function of generating a transmission / reception clock according to the speed information from the auto fallback control unit 16. The transmission / reception clock is used for transmission of reception data of the multiplexing unit 18, transmission data reception of the separation unit 20, and transmission / reception of the DTE. Used for

That is, the bulk transmission apparatus includes a plurality of line interface units 10, a bulk control unit 12, a DTE interface unit 14, or an auto fallback control unit 16.
Is provided. If any of the lines fails during bulk communication using a plurality of lines, the line interface unit 10 detects this and notifies the auto fallback control unit 16 of this. The auto fallback control unit 16 determines which line is a faulty line or a normal line, that is, acquires information on a normal line, notifies the bulk control unit 12 of valid line information and speed information, and transmits and receives data transmission and reception data. The control signal is notified to the DTE interface unit 14.

The bulk control unit 12 performs demultiplexing and bulk communication establishment (re-synchronization) only on the normal line in accordance with the valid line information, and simultaneously controls the frequency of the transmission / reception clock (reduces the transmission speed) in accordance with the speed information. The transmission to the DTE interface unit 14 is performed. The DTE interface unit 14 includes means for performing clamp control of transmission / reception data with the DTE from transmission of a line failure to establishment of bulk communication in accordance with transmission / reception clock transmission and transmission / reception data clamp control signals. In the clamp control, the amount of transmitted / received data is suppressed to a certain level.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIG. FIG. 3 is a diagram showing the operation of the automatic fallback method of the present invention.

When the communication is in a normal normal communication state (step A1), the auto fallback control unit 16 determines whether or not a failure has occurred in the line (step A2). As a result of determination, if a failure occurs on any of the multiple lines while performing bulk communication using multiple lines,
Line interface unit 10-1, 1 where a faulty line has occurred
0-2, 10-3 or 10-4 notifies the automatic fallback control unit 16 of a line failure detection signal. The auto fallback control unit 16 constantly monitors the line failure detection signal from each line, and instantaneously determines which line has a failure and which line is normal (step A3).

As a result of the judgment, if a fault has occurred in all the lines, the communication is disconnected (step A4). As a result of the determination, the auto fallback control unit 16 determines whether the faulty line of each line
The normal line is determined (step A5), the information of the normal line is obtained by the determination, and a transmission / reception data clamp control signal is transmitted to the DTE interface unit 14 to start the auto fallback operation (step A6). When receiving the transmission / reception data clamp control signal, the DTE interface unit 14 transmits the transmission data from the DTE and the bulk control unit 1.
2 is clamped.

Next, the automatic fallback control unit 16
The effective channel information is notified to the multiplexing unit 18, the demultiplexing unit 20, the bulk frame receiving unit 22, or the bulk frame transmitting unit 24 of the bulk control unit 12, and the speed information is notified to the transmission / reception clock generating unit 26. The transmission / reception clock generation unit 26 controls the transmission / reception clock frequency in accordance with the speed information, and transmits the clock to the multiplexing unit 18, the demultiplexing unit 20, or the DTE interface unit 14.

The multiplexing unit 18 uses only the normal lines in accordance with the valid line information, and sets each line interface unit 10-1, 10-2,
The multiplexing of the data received from 10-3 or 10-4 is performed, and the demultiplexing unit 20 also demultiplexes the transmission data from the DTE interface unit 14 only on the normal line according to the valid line information. At this time, the transmission / reception clock from the transmission / reception clock generation unit 26 is used as a clock for transmitting the reception data to the DTE interface unit 14 in the multiplexing unit 18. Similarly, a clock for taking in transmission data from the DTE interface unit 14 in the separation unit 20 uses a transmission / reception clock from the transmission / reception clock generation unit 26.

When the demultiplexing is performed based on the new valid line information, the bulk frame transmitting section 24 transmits the bulk frame to the valid line. The opposing bulk transmission apparatus has the same function as the local station bulk transmission apparatus, and similarly transmits a bulk frame. When the local bulk frame receiving unit 22 detects a bulk frame from the opposite bulk transmission device, it transmits a line synchronization establishment signal to the auto fallback control unit 16 to notify that the bulk transmission has been established (step A).
7).

After transmitting the line synchronization establishment signal, the operations of the bulk frame transmitting section 24 and the bulk frame receiving section 22 are stopped. When receiving the line synchronization establishment signal, the auto fallback control unit 16 stops sending the transmission / reception data clamp control signal to the DTE interface unit 14. DTE
When the clamp of the transmission / reception data is released by the interface unit 14, the bulk transmission becomes possible, and the auto fallback operation ends (step A8). After the completion of the automatic fallback, communication at a speed lower than the original transmission speed becomes possible (step A9).

Next, another embodiment of the present invention will be described in detail with reference to FIG. FIG. 4 is a diagram showing the operation of the auto fall forward method of the present invention.

By providing the auto fallback control section 16 which constantly monitors the line fault detection signal in FIG. 1 with an auto fall forward function, it is possible to automatically increase the transmission speed and resume communication when the line is restored. It becomes possible. The auto fall forward operation will be described with reference to FIG.

A certain line becomes a failure, the transmission speed is reduced (fallback state), and bulk communication is in progress (step B1).
Next, it is determined whether the line failure has been recovered (step B).
2). As a result of the determination, if the failure does not recover, that is, if the state does not change, the process returns to step B1. If the result of the determination indicates that the failed line has been restored, the line interface unit 10-1, 10-2, 10-3 or 10- 10 where the failed line has been restored.
4 stops sending the line failure detection signal.

The auto-fallback (auto-fall-forward) control unit 16 constantly monitors the line fault detection signal from each line, and instantaneously determines which line has recovered from the fault (step B3). When the determination of the failure recovery line is completed, a transmission / reception data clamp control signal is sent to the DTE interface unit 14 to start the auto fall forward operation. Upon receiving the transmission / reception data clamp control signal, the DTE interface unit 14 clamps transmission data from the DTE or reception data from the bulk control unit 12 (step B4).

Next, the auto fallback (auto fall forward) control unit 16 notifies the multiplexing unit 18, the demultiplexing unit 20, the bulk frame receiving unit 22 or the bulk frame transmitting unit 24 of the bulk control unit 12 of the valid line information. Then, the transmission / reception clock generator 26 is notified of the speed information. The transmission / reception clock generation unit 26 controls the transmission / reception clock frequency according to the speed information, and sends the clock to the DTE interface unit 14, the multiplexing unit 18, or the demultiplexing unit 20.

The multiplexing unit 18 operates according to the valid line information on the normal lines including the recovered line, and each line interface unit 10-
1, 10-2, 10-3 or 10-4 is multiplexed, and the demultiplexing unit 20 also operates the DTE interface unit 10-1, 10-2, 10-3 or 10-4
To separate transmission data from.

At this time, the transmission / reception clock from the transmission / reception clock generation unit 26 is used as a clock for transmitting the reception data to the DTE interface unit 14 in the multiplexing unit 18. Similarly, in the separating unit 20, the transmission data is
As a clock to be taken in from the TE interface unit 14, a transmission / reception clock from the transmission / reception clock generation unit 26 is used.

When the demultiplexing is performed based on the new valid line information, the bulk frame transmitting section 24 transmits the bulk frame to the valid line. The opposing bulk transmission apparatus has the same function as the local station bulk transmission apparatus, and similarly transmits a bulk frame. Upon detecting the bulk frame from the opposite bulk transmission device by the local station bulk frame receiving unit 22, the local bulk device transmits a line synchronization establishment signal to the auto fallback (auto fall forward) control unit 16 and the bulk transmission is established. Is notified (step B5).

After the transmission of the line synchronization establishment signal, the auto fallback (auto fall forward) control unit 16 controls the bulk frame transmitting unit 24 or the bulk frame receiving unit 2.
Step 2 is stopped. Upon receiving the line synchronization establishment signal, the auto fallback (auto fall forward) control unit 16 stops sending the transmission / reception data clamp control signal to the DTE interface unit 14. When the clamp of the transmission / reception data is released by the DTE interface unit 14, bulk transmission becomes possible, and the auto fall forward operation ends (step B6). After the completion of the auto fall forward, the DTE can communicate at the original transmission rate (before the line failure occurs) (step B7).

As described above, the auto fall forward operation is performed in the same manner as the auto fall back operation. The present invention shows an auto fallback control in a digital transmission bulk transmission device.

[0036]

The bulk transmission apparatus of the present invention removes a faulty line, establishes line synchronization only on a normal line, and resumes bulk transmission. Therefore, any one of the lines becomes an obstacle during bulk communication using a plurality of lines. In this case, it is possible to avoid a systematic disconnection in the event of a failure.

The bulk transmission apparatus automatically removes a faulty line, establishes line synchronization only on a normal line, and automatically resumes bulk transmission. Therefore, it is possible to shorten the communication interruption time when a line fault occurs.

Further, since the bulk transmission apparatus automatically removes the faulty line, establishes line synchronization only on the normal line, and automatically resumes the bulk transmission, maintenance is performed in the process from the communication interruption due to the line failure to the bulk transmission restart. It does not require any human work.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a bulk transmission device of the present invention.

FIG. 2 is a diagram illustrating a configuration of a bulk control unit of the present invention.

FIG. 3 is a diagram showing the operation of the auto fallback method of the present invention.

FIG. 4 is a diagram illustrating the operation of the auto fall forward method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Line interface 12 Bulk control part 14 DTE interface part 16 Auto fallback control part 18 Multiplexing part 20 Demultiplexing part 22 Bulk frame receiving part 24 Bulk frame transmitting part 26 Transmission / reception clock generation part

Claims (6)

[Claims] A terminal device is connected to a plurality of lines and the terminal device, and when a failure occurs in any of the lines, line synchronization is established on a line other than the line in which the failure has occurred. And a bulk transmission apparatus for performing bulk communication for transmitting and receiving a large amount of data, wherein the state of each of the plurality of lines is monitored and the speed is automatically adjusted. 2. The bulk transmission device is connected to the plurality of lines, interfaces data transmitted and received with the plurality of lines, detects a line failure of the line,
A line interface for notifying the occurrence of the line failure; and a bulk for transmitting and receiving the data of the line via the line interface. When a failure occurs in the line, transmitting and receiving the data to and from the terminal based on various kinds of information to be notified. A control unit, a data terminal interface unit connected to the terminal device and the bulk control unit, and performing communication by lowering the data transmission / reception speed to a speed at the time of failure based on the notified information; and the line interface. A notification of the occurrence of the line failure from the unit, obtains information of an effective line in which a failure has not occurred among the plurality of lines from the notification, and obtains information of the effective line and transmission / reception data when a failure occurs. An auto phone for notifying speed information to the bulk control unit and notifying the data terminal interface unit of control information of transmission / reception data. Bulk transmission apparatus of claim 1, characterized in that it comprises a callback control unit. 3. If any one of the lines fails during communication using a plurality of lines, the line interface unit detects the failure of the line and notifies the automatic fallback control unit of the failure. The control unit detects which line is the faulty line, notifies the bulk control unit of information on the effective line and the speed information, and notifies the data terminal interface unit of a control signal of transmission / reception data, and the bulk control unit Performs communication synchronization only on the normal line based on the information of the effective line, reduces the transmission speed of transmission / reception data based on the speed information and establishes communication, and the data terminal interface unit performs control based on a control signal to the data terminal side. 3. The bulk transmission apparatus according to claim 2, wherein transmission / reception data from the occurrence of a line failure to the establishment of communication is controlled. 4. The faulty line detects recovery,
The auto fallback control unit detects which line is a faulty line, notifies the bulk control unit of information and speed information of an effective line and notifies the data terminal interface unit of a control signal of transmission / reception data, The bulk control unit performs communication synchronization only on the normal line based on the information of the effective line, reduces the transmission speed of transmission / reception data based on the speed information and establishes communication, and the data terminal interface unit transmits data to the data terminal side. 4. The bulk transmission apparatus according to claim 3, wherein transmission / reception data from the occurrence of a line failure to the establishment of communication is controlled based on the control signal. 5. An automatic fallback method in a bulk transmission apparatus for detecting occurrence of a failure in a communication line and automatically resuming communication only on a normal line where no failure has occurred, comprising: a) a plurality of communication lines; Detecting that a failure has occurred in all the lines, and determining whether or not all the lines have failed; b) if the result of the determination is that all the lines have a failure, disconnect the communication; If there are no failures in all the lines, the effective line information indicating which communication line is the effective line in which no failure has occurred, and the information on the speed of transmission / reception data at the time of the failure in accordance with the state of the effective line. Obtaining certain speed information; c) suppressing the amount of transmitted / received data; d) performing line synchronization with only valid lines from the valid line information; and e) releasing the restriction performed in step c. Steps and, f) the controlling the speed of the effective line which is synchronized from the speed information, the auto fallback method which comprises resuming the communication step, the Ru. 6. A method comprising: controlling the speed of the valid line, and detecting that the failed line has been recovered during communication and determining which of the plurality of communication lines is the valid line; Obtaining valid line information and speed information of transmitted / received data according to the state of the valid line; b) suppressing the amount of transmitted / received data; and c) connecting only valid lines from the valid line information. Performing a synchronization; d) releasing the suppression performed in step c); and e) controlling the speed of the effective line synchronized from the speed information and restarting communication. The auto fallback method according to claim 5, wherein