JP3123942B2 - Bulk transmission method using dedicated line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dedicated line bulk transmission system for transmitting data between terminal devices using a plurality of dedicated lines.

[0002]

2. Description of the Related Art FIG. 8 shows a block diagram of a conventional bulk transmission system using an advanced information communication system (so-called INS) line. Note that the bulk transmission method is a transmission method in which B channels of 64 kbps of ISDN are bundled as is well known. First terminal side sending signal a outputted from the terminal device 1 _-2 is input to the bulk transmission apparatus _2-2. And bulk transmission device 2
_{In -2} , the bulk separation unit 4 creates bulk frame transmission signals c _-1 and c _-2 to which a frame signal is added for performing bulk transmission, and the INS interface units _5-1 and 5
_-2 (the frame format is shown in FIG. 9).

The INS interface unit 5 creates an INS signal e _-1 for output to the INS network 3 and
Output to the network 3. Then through the INS network 3 to the bulk transmission apparatus 2 _-1 mating, and outputs it as INS signal e _-2. Moreover, INS signal e _-3 outputted from the bulk transmission apparatus 2 _-1 mating similarly is input to the bulk transmission apparatus _2-2 as INS signal e _-4 via the INS network 3. In addition,
The signal flows of the INS signals e _-1 , e _-2 , e _-3 , and e _{-4 correspond} to the directions from the INS interface units 5 _-1 and 5 _-2 to the INS network 3, and the INS interface from the INS network 3 respectively. It exists in both directions to the units _5-1 and _5-2 , but for convenience of explanation, I
The NS signals e _-1 and e _-3 are transmitted from the INS interface unit 5 to the I
The direction to the NS network 3 and the INS signals e _-2 and e _-4
From the direction to the INS interface unit 5.

The INS signal e- ₄ from the INS network 3 is IN
It enters the S interface unit _5-2, and output the synchronization detector _6-2 and the delay correcting unit 7 _-2 as a bulk frame reception signal d _-2. Then the sync detector _6-2, the bulk transmission of FAW signals are synchronous signals detected (frame synchronization signals, shown in h in FIG. 9), the synchronization detection signal to notify the position of the synchronization signal f _-2 Is output. Then, an FC signal (FIG. 9) indicating the frame number of the bulk transmission is provided by the synchronization detection signal f- ₂ .
From the position i), and extract the FC signal i
In order to match the frame numbers (values of the FC signal i) of all the INS signals e received from the S network 3 with the position of the FAW signal h, the delay correction unit 7 performs delay correction, and bulk-multiplexes the delay-corrected signal g. Output to the conversion unit 8.

The control unit 9 controls the flow of the data signal in the bulk transmission device _2-2 , and controls transmission / reception to / from the INS network 3 and multiplex / demultiplex control of each channel in each sequence. It is implemented based on.

FIG. 10 shows a connection sequence in the frame mode. First, a call process to the bulk transmission apparatus 2 _-1 in the terminal apparatus 1 _-1, a bulk transmission device 2 _-1 connecting channels first run to the bulk transmission apparatus _2-2 via the INS network 3 Do. The bulk transmission apparatus _2-2 performs an incoming call notification to the terminal device 1 _-2 in the case where the terminal device 1 _-2 for connection with the terminal device 1 _-1, a connection permission to the bulk transmission apparatus _2-2 Notice. Thereafter, the bulk transmission device 2 _-1 on the first channel
During, the connection number of the channels of the bulk transmission apparatus _2-2 and,
Exchange of capability information such as a frame mode method is performed, and connection of up to n connectable channels is performed.

After the connection of all the channels is completed, the amount of delay of each INS signal e when passing through the INS network 3 is different for each channel.
Delay compensation for each channel is performed on the receiving side, after the delay correction end, the communication between the terminal devices 1 ₁ and the terminal device 1 _-2 is performed. For convenience of explanation, the call is described as made from the terminal device 1 _-1, the same applies to the case where a call is made from the terminal device 1 _-2.

In the communication in the frame mode (hereinafter, referred to as a frame mode system), a synchronization signal of a frame is added to each channel and the delay of each channel is corrected as needed on the receiving side. Even if the amount of delay changes in the middle, there is an advantage that the delay can be corrected at any time. However, since a frame including the FAW signal h and the FC signal i at the time of bulk transmission must be added, the transmission path usage efficiency is increased. Has the disadvantage of being bad.

FIG. 11 is a diagram showing a connection sequence in the non-frame mode. Even in the connection in the non-frame mode, as shown in FIG. 11, up to the first delay correction of each channel, the connection is performed in the non-frame mode at the time of exchanging the capability information. And in the non-frame mode, after delay correction of each channel,
The delay amount of each channel is fixed, and the delay amount of each channel is held as it is even after the frame synchronization signal of each channel is removed. Then after changing to the non-frame by removing the frame synchronization signal of the bulk transmission, the communication between the terminal devices 1 ₁ and the terminal device 1 _-2 is performed.

In this non-frame mode communication (hereinafter referred to as a non-frame mode system), communication is performed in the absence of a frame synchronization signal, so that the use efficiency of the transmission path is high. If the delay amount changes in the middle, the data amount during communication will be erroneous because the delay amount cannot be corrected. Therefore, when an error occurs in the data signal due to a change in the delay amount of the INS network 3, a method of disconnecting the communication at the terminal device and re-establishing the connection is adopted.

FIG. 12 is a sequence diagram showing a disconnection operation due to a delay shift when a non-frame mode system is adopted in a conventional bulk transmission system. Between the terminal device 1 ₁ and the terminal device 1 _-2, when the delay amount INS network 3 has changed during the normal communication, the communication data between the terminal device 1 ₁ and the terminal device 1 _-2 An error occurs. So in this case,
It issues a disconnection notification to the bulk transmission apparatus 2 _-2 terminal device 1 _-2 to cut each channel between the bulk transmission apparatus 2 _-1 and bulk transmission apparatus _2-2. After the disconnection of all the channels is completed, the bulk transmission device _2-1 notifies the terminal device _1-1 that all the channels have been disconnected. For convenience of explanation, but here the cutting notification is assumed to be notified from the terminal apparatus 1 _-2 cutoff notice from the terminal device 1 _-1 is issued, also it goes without saying that if the same operation is performed.

[0012]

The above conventional bulk transmission method has a problem that the transmission efficiency is poor when a dedicated line is used. That is, in the case of the non-frame mode, when the delay of any channel changes during communication, the delay cannot be corrected. To the frame mode at the same time, and it is necessary to perform delay correction at the same time. In the case of the INS line, the data line can be disconnected and reconnected in a predetermined method, and the delay can be corrected again. However, when the non-frame mode method is adopted with a dedicated line, there is no method of switching simultaneously. Therefore, when a dedicated line is used, the frame mode system must be adopted.However, when the frame mode system is adopted, the synchronization signal of the frame needs to be added to each channel. become worse.

The present invention has been made to solve such a problem, and has as its object to provide a bulk transmission system using a dedicated line with high transmission efficiency.

[0014]

A bulk transmission system using a dedicated line according to the present invention is a bulk transmission system using a dedicated line connected between a bulk transmission device connected to each terminal device via a dedicated line network. The transmission device is provided with a synchronization detection unit that constantly detects the synchronization of the data signals of all the channels, performs communication in a so-called non-frame mode between the two terminal devices, and changes the amount of delay of the data signal on the dedicated line to change the data. When an error occurs, both terminals detect the error and disconnect the data line, and both bulk transmission devices communicate frame mode signals. And a means for re-delaying the signal and then resuming communication by connecting both data terminals.

Further, in a bulk transmission system using a dedicated line connected between a bulk transmission device connected to each terminal device via a dedicated line network, synchronization of data signals of all channels is always detected by each bulk transmission device. A synchronization detection unit is provided to perform communication in a so-called non-frame mode between both terminal devices, and when a delay amount of a data signal on a dedicated line changes and a data error occurs, this is detected and both terminal devices are detected. Disconnect the data line, both bulk transmission devices communicate frame mode signals, establish synchronization respectively in the synchronization detection unit, perform re-delay correction of the signal of each channel,
Thereafter, the communication device returns to the communication in the non-frame mode, and the terminal device is provided with means for connecting the data line and restarting the communication.

Further, in a bulk transmission system using a dedicated line connected between a bulk transmission device connected to each terminal device by a dedicated line network, synchronization of data signals of all channels is always detected by each bulk transmission device. Means for providing a synchronization detection unit, communication is performed in a so-called non-frame mode between both terminal devices (referred to as a first terminal device and a second terminal device), and the amount of delay of a data signal on the dedicated line changes. In this case, the first terminal device in which a data error has occurred due to the change in the delay amount disconnects the data line, and issues a data line disconnection notification to the bulk transmission device on its own side. Means for transmitting a frame mode signal to the bulk transmission device of the second terminal device by the notification, and the bulk transmission device of the second terminal device transmits the frame mode signal transmitted by the synchronization detecting unit. By establishing a synchronization by receiving a signal of Mumodo, said detects that the bulk transmission apparatus of the first terminal device is operated in the frame mode second
Means for transmitting a data line disconnection notification to the other terminal device and transmitting a frame mode signal to the bulk transmission device of the first terminal device, and the second terminal device receiving the data line disconnection notification and disconnecting the data line. Means for receiving the signal of the frame mode transmitted by the synchronization detecting unit to establish synchronization, whereby the bulk transmission device of the first terminal device confirms that the second terminal device has operated in the frame mode. Detecting means, both of the bulk transmission devices detect that the bulk transmission device of the partner terminal device has operated in the frame mode, and then perform re-delay correction of the signal of each channel,
A data line connection notification is issued to each terminal device, and both terminals connect the data line and restart communication by this notification.

Further, in a bulk transmission system using a dedicated line connected between a bulk transmission device connected to each terminal device by a dedicated line network, the synchronization of data signals of all channels is always detected by each bulk transmission device. Means for providing a synchronization detection unit, communication is performed in a so-called non-frame mode between both terminal devices (referred to as a first terminal device and a second terminal device), and the amount of delay of a data signal on the dedicated line changes. In this case, the first terminal device in which a data error has occurred due to the change in the delay amount disconnects the data line, and issues a data line disconnection notification to the bulk transmission device on its own side. Means for transmitting a frame mode signal to the bulk transmission device of the second terminal device by the notification, and the bulk transmission device of the second terminal device transmits the frame mode signal transmitted by the synchronization detecting unit. By establishing a synchronization by receiving a signal of Mumodo, said detects that the bulk transmission apparatus of the first terminal device is operated in the frame mode second
Means for transmitting a data line disconnection notification to the other terminal device and transmitting a frame mode signal to the bulk transmission device of the first terminal device, and the second terminal device receiving the data line disconnection notification and disconnecting the data line. Means for receiving the signal of the frame mode transmitted by the synchronization detecting unit to establish synchronization, whereby the bulk transmission device of the first terminal device confirms that the second terminal device has operated in the frame mode. Detecting means, both of the bulk transmission devices detect that the bulk transmission device of the partner terminal device has operated in the frame mode, and then perform re-delay correction of the signal of each channel,
Means for issuing a data line connection notification to each terminal device and shifting to operation in the non-frame mode, and means for connecting both data lines to resume communication by the data line connection notification. I do.

Further, a bulk demultiplexing unit for generating a bulk frame transmission signal from a terminal transmission signal from a terminal device, a bulk frame reception signal and the leased line network from the bulk frame transmission signal and a leased line signal from the leased line network. A dedicated line interface unit that creates the dedicated line signal to the synchronous detection unit that constantly detects synchronization and creates a synchronization detection signal based on the bulk frame reception signal; and a delay unit that is delayed by the bulk frame reception signal and the synchronization detection signal. A delay correction unit that generates a corrected signal, a bulk multiplexing unit that generates a terminal reception signal based on the delay corrected signal, the bulk demultiplexing unit, the dedicated line interface unit, the synchronization detection unit, and the delay correction unit And a control unit for controlling the bulk multiplexing unit.

The bulk transmission method using the leased line of the present invention is as follows.
By operating the synchronization detection unit that detects the synchronization signal of the frame of each channel at all times, when switching to the frame mode method to perform delay correction again on the own station side, synchronization is established by the synchronization detection unit on the other station side. Therefore, it is known that the own station has performed the delay correction again on the other station side, and the other station can also switch to the frame mode system to perform the delay correction again. Can perform delay correction at the same time.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and shows a bulk transmission system using a dedicated line. In FIG, 1 _-1, 1 _-2, respectively terminal transmission signal a
Outputting terminal for inputting a terminal receiving signals b and 2 _-1, 2
₂ is a bulk transmission device, 4 is a bulk demultiplexing unit that generates a bulk frame transmission signal c based on the terminal transmission signal a, and 6 is a synchronization detection unit that generates a synchronization detection signal f based on the bulk frame reception signal d. In the embodiment, the synchronization detector 6 is configured to always operate even during communication without a frame mode signal.

Reference numeral 7 denotes a delay correction unit for generating a signal g after delay correction based on the bulk frame reception signal d and the synchronization detection signal f;
Reference numeral 8 denotes a bulk multiplexing unit that creates a terminal reception signal b from the delay-corrected signal g, and reference numeral 9 denotes a bulk demultiplexing unit 4 and a synchronization detection unit 6.
A control unit for controlling the delay correction unit 7, the bulk multiplexing unit 8, and the dedicated line interface unit 11, a dedicated line network 10, a bulk frame transmission signal c and a dedicated line signal j from the dedicated line network 10. Received signal d and leased line network 10
Is a dedicated line interface unit for generating a dedicated line signal j to the dedicated line.

Next, the operation of the embodiment shown in FIG. 1 will be described. FIG. 2 is a diagram showing a connection sequence in a non-frame mode using a dedicated line. First make a connection notification by the terminal device 1 _-1 to the bulk transmission apparatus 2 _-1 If the bulk transmission apparatus 2
_-1 connects to the bulk transmission device _2-2 in the frame mode via the leased line network 10. And the delay amount of the leased line signal j when via a dedicated line network 10 for each channel are different, perform delay compensation for each channel on the receiving side of the bulk transmission apparatus _2-2, after delay correction, the frame The delay amount of each channel is fixed so that the delay amount of each channel is maintained even after the removal. And the bulk transmission apparatus _2-2, changed to remove the frame of the bulk transmission to the non-frame mode and each connection notification to the terminal device 1 ₁ and the terminal device 1 _-2. Thereafter, communication is performed between the terminal device 1 ₁ and the terminal device 1 _-2. Note that this connection process is performed by issuing a connection notification from the terminal device _1-1 for convenience of description.
Similar connection processing even if the connection notification is issued from terminal 1 _-2 is performed.

FIG. 3 is a diagram showing a sequence in the case of performing re-delay correction in the non-frame mode on the dedicated line.
If the delay amount of the dedicated line network 10 during normal communications between the terminal device 1 ₁ and the terminal device 1 _-2 changed, data error between the terminal device 1 ₁ and the terminal device 1 _-2 Occurs. Therefore disconnects notification to bulk transmission apparatus 2 _-2 terminal device 1 _-2, the terminal device 1 _-2 disconnects the data line. The bulk transmission device _2-2 is connected to the bulk transmission device 2 via the leased line network 10.
Output frame mode signal to _-1 . At this time, in the bulk transmission device _2-1 , synchronization is always detected by the synchronization detection unit 6, so that synchronization is established by the transmitted frame mode signal, and the other bulk transmission device _2-2 Know that the mode has been operated.

[0024] _-2 counterpart bulk transmission device 2 knows that it has operated in the frame mode, the bulk transmission apparatus 2 _-1 performs the disconnection notification to the terminal device 1 _-1, the terminal apparatus 1 _-1 data line cut, also outputs the frame mode signal to the bulk transmission device _2-2 via the dedicated line network 10 from the bulk transmission apparatus 2 _-1. In the bulk transmission device _2-2 , since the synchronization is always detected by the synchronization detection unit 6, the synchronization is established by the transmitted frame mode signal, and the other bulk transmission device _{2-1 operates} in the frame mode. Know that it works. Each bulk transmission device 2 _-1 and bulk transmission device 2 _-2
Since the delay amount of the dedicated line signal j when passing through the dedicated line network 10 differs for each channel from the previous time, the delay correction of each channel is performed again. After this re-delay correction, the delay amount of each channel is fixed so that the delay amount of each channel is maintained even after the frame is removed, the frame of bulk transmission is removed, and the mode is changed to the non-frame mode.
Performing connection notification respectively to ₁ and the terminal device 1 _-2. afterwards,
Data communication between the terminal device 1 ₁ and the terminal device 1 _-2 is resumed. Note this re-delay correction processing, for convenience of explanation, has been described a case where the re-delay correction by changing the first frame mode from the terminal device 1 _-1, a first frame mode from the terminal device 1 _-2 The same applies to the case where the re-delay correction processing is performed after the change. When the INS network 3 is used,
Since the bulk transmission device 2 of the connection partner is an unspecified partner, it is necessary to know the number of channel connections of the partner and the capabilities such as the frame mode method at the time of the first connection.
However, in the connection sequences shown in FIGS. 2 and 3, the capacity exchange is not performed since the connection partner is specified using the leased line network 10.

Hereinafter, the above-described embodiment will be described in detail at an example level. Figure 4 is a block diagram showing a first embodiment of the present invention, each terminal apparatus 1 _-1, between the terminal apparatus 1 _-2, leased network 10 from 256 kb / s (4 channels 64 kb / s) The line is connected, the connection / disconnection notification from the terminal device 1 is turned on / off of the terminal-side ER signal m, and the connection / disconnection notification from the bulk transmission device 2 is turned on / off of the terminal CD signal n.
FIG. 2 is a block diagram of a bulk transmission method in a non-frame mode using a dedicated line when the switch is turned off. This bulk transmission device 2 _-2
Is connected to the transmission line of 256 kb / s from the dedicated line network 10, so that the dedicated line interface unit 1 for two lines (since one line has two channels of 64 kb / s)
1 _-1 and 11 _-2 are provided, and at the same time, a synchronization detection unit 6 and a delay correction unit 7 are provided for four channels.

The output from the bulk demultiplexing unit 4 is separated into four channels and output to the leased line interface unit 11, and the bulk multiplexing unit 8 outputs a delay correction unit 7 for four channels.
The output delay-corrected signal g is input. Further, the terminal side RD signal k output from the bulk multiplexing unit 8 is output to the terminal device 1 and the terminal side RD signal k output from the terminal device 1 is output.
The D signal 1 is input to the bulk separation unit 4. Also connect /
The terminal-side ER signal m for performing disconnection control is output from the terminal device 1 and input to the control unit 9, and the terminal-side CD signal n is output from the control unit 9 and input to the terminal device 1. . That is, the terminal transmission signal a shown in FIG. 1 becomes the terminal side SD signal 1 and the terminal side ER signal m, and the terminal reception signal b becomes the terminal side RD signal k and the terminal side CD signal n.

FIG. 5 is a diagram showing a connection sequence in the non-frame mode on the dedicated line in the embodiment shown in FIG.
First, as a connection notification to the bulk transmission apparatus 2 _-1 in the terminal apparatus 1 _-1, when the ON of the terminal ER signal m _-1, bulk transmission apparatus 2 _-1 bulk transmission apparatus via a dedicated line network 10 2 _-2
And connection in frame mode. Since the amount of delay of the dedicated line signal j when passing through the dedicated line network 10 differs for each channel, the delay correction of each channel is performed on the receiving side. Next, after the delay correction, the delay amount of each channel is fixed so that the delay amount of each channel is maintained even after the frame is removed. Then, after removing the frame of the bulk transmission and changing to the non-frame mode, the terminal device _1-1 and the terminal device 1-2 _{receive the} terminal side CD signal n as a connection notification, respectively.
_-1 and the terminal side CD signal n- ₂ are turned on. Thereafter, communication is performed between the terminal device 1 ₁ and the terminal device 1 _-2.

FIG. 6 is a diagram showing a sequence in the case of performing the re-delay correction in the non-frame mode on the dedicated line in the embodiment shown in FIG. If the delay amount of the dedicated line network 10 during normal communications between the terminal device 1 ₁ and the terminal device 1 _-2 changed, data error between the terminal device 1 ₁ and the terminal device 1 _-2 Occurs. Terminal 1 _-2 detected the data error,
Terminal ER as disconnection notification to the bulk transmission apparatus _2-2
The signal m- ₂ is turned off to disconnect the data line. Bulk transmission apparatus 2 _-2 outputs the frame mode signal to the bulk transmission device 2 _-1 through the dedicated line network 10. Since the constant synchronization detection is performed synchronized signal of the frame mode is established by the synchronization detection unit 6, the bulk transmission apparatus 2 _-1, know that the bulk transmission apparatus _2-2 of the counterpart operates in the frame mode .

When the bulk transmission device 2-2 on the other side knows that it has operated in the frame mode, the bulk transmission device 2-1 sends the terminal CD signal OF-1 of the terminal side CD signal n-1 as a disconnection notification to the terminal device 1-1.
F, and outputs a frame mode signal from the bulk transmission device 2-1 to the bulk transmission device 2-2 via the leased line network 10. The terminal device 1-1 disconnects the data line in response to the disconnection notification. And the bulk transmission device 2-1 and the bulk transmission device 2
In -2, the delay amount of the dedicated line signal j when passing through the dedicated line network 10 differs for each channel from the previous time, so that the delay correction of each channel is performed again. After the delay correction, the delay amount of each channel is fixed so that the delay amount of each channel is maintained even after the frame is removed. After removing the bulk transmission frame and changing to non-frame mode,
The terminal device 1-1 and the terminal device 1-2 turn on the terminal side CD signal n-1 and the terminal side CD signal n-2 as connection notification, respectively. Thereafter, communication between the terminal device 1-1 and the terminal device 1-2 is restarted.

FIG. 7 shows a second embodiment of the present invention in which 384 kb / s (64 k
b / s are connected by 6 channels), the connection / disconnection notification from the terminal device 1 is turned on / off of the terminal-side ER signal m, and the connection / disconnection notification from the bulk transmission device 2 is sent from the terminal-side CD signal n
FIG. 2 is a block diagram of a bulk transmission method in a non-frame mode on a dedicated line performed by ON / OFF of FIG. Since the bulk transmission device 2-2 is connected to the transmission line of 384 kb / s from the dedicated line network 10, the dedicated line interface unit 11 for three lines (since one line has three channels of 64 kb / s) -1, 11-2, and 11-3 are provided, and at the same time, a synchronization detection unit 6 and a delay correction unit 7 are provided for six channels.
Accordingly, the output from the bulk demultiplexing unit 4 is separated into six channels and output to the dedicated line interface unit 11, and the bulk multiplexing unit 8 receives the delay corrected signal g output from the delay correction unit 7 for six channels. Is done.

The terminal output from the bulk multiplexing unit 8
The terminal RD signal k is input to the terminal device 1 and
The terminal-side SD signal 1 output from the terminal is input to the bulk demultiplexing unit 4. A terminal-side ER signal m for performing connection / disconnection control is output from the terminal device 1 and input to the control unit 9,
The terminal-side CD signal n is output from the control unit 9 and the terminal device 1
Is input to Therefore, the terminal transmission signal a shown in FIG. 1 becomes the terminal side SD signal 1 and the terminal side ER signal m, and the terminal reception signal b becomes the terminal side RD signal k and the terminal side CD signal n. Note that the connection sequence and the re-delay correction sequence are the same as those in the first embodiment described with reference to FIGS.

[0032]

As described above, in the bulk transmission system using the dedicated line of the present invention, the synchronization detection unit in the bulk transmission apparatus is always operated, so that the non-frame is used for performing the delay correction again on one terminal side. When switching from the mode to the frame mode, synchronization is established in the bulk transmission device of the other terminal, and the terminal can also switch to the frame mode in order to perform delay correction again. Delay correction can be performed, and there is an effect that communication using a non-frame mode method using a dedicated line becomes possible.

Further, since the non-frame mode system can be adopted, a synchronization signal is not always inserted unlike the conventional frame mode system, and all data signals of each channel can be used as data signals on the terminal side, thereby improving transmission efficiency. There is an effect that it can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a bulk transmission method using a dedicated line according to the present invention.

FIG. 2 is a diagram showing a connection sequence in a non-frame mode using a dedicated line in the embodiment shown in FIG.

FIG. 3 is a diagram showing a sequence of re-delay correction in a non-frame mode using a dedicated line in the embodiment shown in FIG. 1;

FIG. 4 is a block diagram showing a first embodiment of a bulk transmission system using a dedicated line according to the present invention.

FIG. 5 is a diagram showing a connection sequence in a non-frame mode on a dedicated line according to the first embodiment shown in FIG. 4;

FIG. 6 is a diagram showing a sequence of re-delay correction in a non-frame mode using a dedicated line according to the first embodiment shown in FIG. 4;

FIG. 7 is a block diagram showing a second embodiment of a bulk transmission method using a dedicated line according to the present invention.

FIG. 8 is a block diagram for explaining a conventional bulk transmission method using an INS line.

FIG. 9 is a diagram illustrating a frame format of bulk transmission.

FIG. 10 is a diagram showing a connection sequence in a frame mode in a conventional bulk transmission method.

FIG. 11 is a diagram showing a connection sequence in a non-frame mode in a conventional bulk transmission method.

FIG. 12 is a diagram showing a disconnection sequence due to a delay shift in a non-frame mode in a conventional bulk transmission method.

[Explanation of symbols]

1,1 _-1, 1 _-2 terminal units 2 _-1, 2 _-2 bulk transmission device 3 INS network 4 bulk demultiplexer 5 INS interface unit 6 synchronization detector 7 delay correcting unit 8 bulk multiplexing unit 9 controls Unit 10 Dedicated line network 11 Dedicated line interface unit a Terminal transmission signal b Terminal reception signal c Bulk frame transmission signal d Bulk frame reception signal e INS signal f Synchronization detection signal g Delay corrected signal h FAW signal (frame synchronization signal) i FC Signal (frame number signal) j Dedicated line signal k Terminal RD signal l Terminal SD signal m Terminal ER signal n Terminal CD signal

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI H04Q 11/04 H04Q 11/04 Z (58) Investigated field (Int.Cl. ⁷ , DB name) H04L 12/02 H04J 3 / 06 H04L 7/00 H04L 29/08 H04M 3/00 H04Q 11/04

Claims (5)

(57) [Claims] In a bulk transmission method using a dedicated line connected between a bulk transmission device connected to each terminal device and a dedicated line network, the synchronization of data signals of all channels is always detected by each bulk transmission device. A synchronization detection unit is provided to perform communication in a so-called non-frame mode between the two terminal devices. If a data error occurs due to a change in the amount of delay of the data signal on the dedicated line, this is detected and both terminal devices are detected. The data line is disconnected, the two bulk transmission devices communicate frame mode signals, the synchronization detectors establish synchronization respectively, and perform re-delay correction of the signals of the respective channels. Means for connecting a line to restart communication, and a bulk transmission method using a dedicated line. 2. In a bulk transmission system using a dedicated line connected between a bulk transmission device connected to each terminal device by a dedicated line network, synchronization of data signals of all channels is always detected by each bulk transmission device. A synchronization detection unit is provided to perform communication in a so-called non-frame mode between the two terminal devices. If a data error occurs due to a change in the amount of delay of the data signal on the dedicated line, this is detected and both terminal devices are detected. The data line is disconnected, the two bulk transmission devices communicate frame mode signals, the synchronization detectors establish synchronization respectively, correct re-delay of the signals of each channel, and then perform communication in the non-frame mode. And means for both terminal devices to connect the data line and resume communication. 3. In a bulk transmission system using a dedicated line connected between a bulk transmission device connected to each terminal device via a dedicated line network, synchronization of data signals of all channels is always detected by each bulk transmission device. Means for providing a synchronization detecting unit, communication is performed in a so-called non-frame mode between both terminal devices (referred to as a first terminal device and a second terminal device), and a delay amount of a data signal on the dedicated line changes. In this case, the first terminal device in which a data error has occurred due to the change in the delay amount disconnects the data line, and issues a data line disconnection notification to the bulk transmission device on its own side. Means for transmitting a frame mode signal to the bulk transmission device of the second terminal device by the notification, wherein the bulk transmission device of the second terminal device transmits the frame transmitted by the synchronization detection unit. By receiving the mode signal and establishing synchronization, it detects that the bulk transmission device of the first terminal device has operated in the frame mode, and issues a data line disconnection notification to the second terminal device. Means for transmitting a mode signal to the bulk transmission device of the first terminal device, means for the second terminal device to receive the data line disconnection notification and disconnection of the data line, Means for detecting that the second terminal device has been operated in the frame mode by receiving the frame mode signal sent by the synchronization detecting unit and establishing synchronization, and both bulk transmission devices are each a partner terminal. After detecting that the device's bulk transmission device has operated in frame mode,
Means for performing re-delay correction of the signal of each channel, issuing a data line connection notification to each terminal device, and by means of this notification both terminal devices connect the data line and resume communication. Bulk transmission method using a dedicated line. 4. In a bulk transmission system using a dedicated line connected between a bulk transmission device connected to each terminal device via a dedicated line network, synchronization of data signals of all channels is always detected by each bulk transmission device. Means for providing a synchronization detecting unit, communication is performed in a so-called non-frame mode between both terminal devices (referred to as a first terminal device and a second terminal device), and a delay amount of a data signal on the dedicated line changes. In this case, the first terminal device in which a data error has occurred due to the change in the delay amount disconnects the data line, and issues a data line disconnection notification to the bulk transmission device on its own side. Means for transmitting a frame mode signal to the bulk transmission device of the second terminal device by the notification, wherein the bulk transmission device of the second terminal device transmits the frame transmitted by the synchronization detection unit. By receiving the mode signal and establishing synchronization, it detects that the bulk transmission device of the first terminal device has operated in the frame mode, and issues a line disconnection notification to the second terminal device. Means for transmitting the signal to the bulk transmission device of the first terminal device, means for the second terminal device to receive the data line disconnection notification and disconnect the data line, and wherein the bulk transmission device of the first terminal device is Means for detecting that the second terminal device has been operated in the frame mode by receiving the frame mode signal transmitted by the synchronization detecting unit and establishing synchronization, and both bulk transmission devices are respectively partner terminal devices After detecting that the bulk transmission device of the above operates in the frame mode,
Means for performing re-delay correction of the signal of each channel, issuing a data line connection notification to each terminal device and shifting to operation in a non-frame mode, and both terminal devices connecting a data line by the data line connection notification and communicating. Means for resuming the operation, and a bulk transmission method using a dedicated line. 5. A bulk demultiplexing unit for generating a bulk frame transmission signal from a terminal transmission signal from a terminal device, a bulk frame reception signal and the leased line network from the bulk frame transmission signal and a leased line signal from a leased line network. A dedicated line interface unit that creates the dedicated line signal to the synchronous detection unit that constantly detects synchronization and creates a synchronization detection signal by the bulk frame reception signal; and a delay by the bulk frame reception signal and the synchronization detection signal. A delay correction unit that generates a corrected signal, a bulk multiplexing unit that generates a terminal reception signal based on the delay corrected signal, the bulk demultiplexing unit, the dedicated line interface unit, the synchronization detection unit, and the delay correction unit And a control unit for controlling the bulk multiplexing unit. A bulk transmission method using a dedicated line, comprising: