JP3014841B2 - Data transfer method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer method and, more particularly, to a bulk mode data transfer method suitable for data transfer between devices connected to an interface of an ISDN user network or between systems. .

[0002]

2. Description of the Related Art Generally, in an interface of an ISDN user network, two B channels (B1, B2) are
Since bit synchronization is not always ensured, use of two B channels as a 128 kbps transmission path is not guaranteed. However, a method of performing data transfer using two B channels is known.

In this method, for example, data is divided into packets, the data is distributed to both channels B1 and B2 for each packet and transmitted, and the packets are reorganized on the receiving side. This is to completely absorb the synchronization gap.

According to this method, when data transfer is always performed at a speed of 128 kbps, even when a large synchronization deviation occurs in a burst due to a circuit detour or the like, it is necessary to receive data in the bulk mode. A large-scale delay assurance circuit and a logic for the circuit are required.

[0005] As a prior art relating to this type of data transfer method, for example, a technique described in Japanese Patent Application Laid-Open No. 63-46032 is known.

[0006]

The prior art described above focuses on delay compensation due to synchronization deviation between the B1 and B2 channels in any case. However, there is a problem that the configuration is redundant when a logic or the like for that purpose is required and a large synchronization deviation does not occur.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to easily perform bulk mode transfer as compared with the prior art which has a function of compensating for a delay due to synchronization deviation in any case. Another object of the present invention is to provide a data transfer method which has been described.

[0008]

According to the present invention, the above object is attained by not performing bulk mode transfer when synchronization between two B-channels is largely deviated.

That is, according to the present invention, the above object is achieved by performing the following processing prior to the original data transfer.

One device transfers certain test data in a bulk mode, and sends out the data on the B1 channel and the B2 channel alternately byte by byte.

At this time, the other device also receives the data in the bulk mode, alternately fetches the data of the B1 channel and the B2 channel, and checks whether the test data is correctly transferred.

As a result of the above check, the receiving device
If the data is transferred correctly, the "bulk mode O
K ”information, if the data is not transferred correctly,
A response is made by setting the information of "bulk mode NG" to the normal mode using one B channel and notifying the test data transmitting apparatus.

At this time, the test data transmitting apparatus also resets the state from the bulk mode to the normal mode using one B channel and waits for a response from the receiving side.

Thereafter, if the bulk mode is OK according to the contents of the response, the state is set to the bulk mode again, and the original data transfer is started.

If the bulk mode is NG, the normal mode using one B channel in that state is
Start the original data transfer.

Further, the object is to provide a simple delay compensation function to absorb a synchronization deviation between channels to a certain extent in this portion, thereby realizing bulk mode transfer by simple means. Is achieved by being able to

[0017]

According to the present invention, as described above, test data is transferred prior to the original data transfer, and it is checked whether or not the line being used can transfer in the bulk mode. It is possible to prevent erroneous transfer.

Further, since the response to the test data is performed in the normal mode using one B channel, the response can be reliably returned.

Furthermore, a simple delay compensation function can absorb a certain amount of synchronization deviation.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the data transfer system according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention for explaining transmission of test data in a bulk mode, FIG. 2 is a diagram for explaining a response to test data, and FIG. 3 is original data in a bulk mode. FIG. 4 is a diagram for explaining a method of delay compensation. Figure 1
3, 1 and 9 are MPUs, 3 and 7 are ISDN control units, 6 and 10 are instruction decoders, 12 is an ISDN network, 1
Reference numerals 3 and 14 are delay compensation circuits.

As shown in FIG. 1, the present invention is applied to a case where data is transferred between devices A and B connected to each other via an ISDN network 12. In the embodiment of the present invention, the device A (B)
(9), ISDN control unit 3 (7), instruction decoder 6 (1
0) and a delay compensation circuit 13 (14).

In the data transfer system using the ISDN network 12 configured as described above, when data communication is to be performed between the devices A and B in the bulk mode, the device A that starts the data transfer first The test data is transmitted to the device B to check whether data communication in the bulk mode is possible. Hereinafter, the transmission of the test data will be described with reference to FIG.

The MPU 1 of the device A sets the ISDN control unit 3 to the bulk mode via the instruction coder 6, and sends the test data 2 to the B1 and B2 channels via the ISDN control unit 3. At this time, the ISDN control unit 3 sends the odd byte side of the test data 2 to the B1 channel and sends the even byte side of the test data 2 to the B2 channel.

At this time, the device B also uses the instruction decoder 10 by the MPU 9, and the ISDN control unit 7 is set to the bulk mode. The ISDN control unit 7 of the device B
Data on 1 channel and B2 channel are received alternately,
The data is passed to the MPU 9 as the reproduced test data 8 through the delay compensation circuit 14. The MPU 9 analyzes the reproduction test data 8 and checks whether the received test data 8 is correct.

The MPU 9 of the device B transmits the test data 8
Is returned to the device A. This response operation will be described with reference to FIG.

If the received test data is correct, the MPU 9 of the device B creates information of “bulk mode OK”. If the test data cannot be received correctly, the MPU 9 creates information of “bulk mode NG”. This information is transferred to the device A via the ISDN control unit 7 as a response 11.

At this time, the devices A and B both
1 and 9 using the instruction decoders 6 and 10,
The N control units 3 and 7 are set to the normal transfer mode using one B channel (the B1 channel is specified in the example of FIG. 2), and the response 11 is thereby set in the normal transfer mode. In the case of the example, it is transmitted to the device A via the B1 channel. This makes it possible to reliably return a response even when it is determined in the test data check that bulk mode transfer is not possible.

The content of the above-mentioned response is "bulk mode NG"
In this case, the devices A and B transfer the original data in the mode shown in FIG. 2, that is, in the normal transfer mode using one B channel.

When the content of the above-mentioned response is "bulk mode OK", the devices A and B set the ISDN control units 3 and 7 to the bulk mode again, and start the original data transfer in the bulk mode. I do. FIG. 3 is a diagram for explaining the data transfer operation. In the data transferred between the devices A and B, the odd byte side data is transmitted via the B1 channel and the even byte side data is transmitted via the B2 channel. Will be transferred.

Next, a method of delay compensation according to the present invention will be described with reference to FIG.

Data to be transmitted to the B1 channel and the B2 channel of the ISDN network is assumed to be a multiplexed form of 8-bit × n packets, and each packet is given a number.

The delay compensation circuits 13 and 14 in the devices A and B
Has a function of holding x packets, that is, data of 8 bits × n × x, and has a function of performing delay compensation by synchronizing deviation between the B1 and B2 channels by referring to each packet number. ing. Thereby, when the data transfer rate of each channel is 64 kbs, nx /
It is possible to compensate for the delay due to the synchronization deviation up to 8192 seconds. The delay compensation circuits 13 and 14 need only be capable of performing delay compensation with a small synchronization deviation as compared with the conventional technique, and can be configured with a small amount of hardware.

According to the above-described embodiment of the present invention, when the above-described synchronization deviation occurs, delay compensation cannot be performed. In such a case, the transfer of the bulk data is performed by transferring the test data. Since the data transfer is performed in the normal transfer mode by knowing that the data transfer is impossible, the data transfer situation does not become impossible.

[0035]

As described above, according to the present invention, when a synchronization deviation exceeding the limit of the delay compensation function occurs, the data transfer in the bulk mode is not performed, so that the synchronization deviation is absorbed in any case. Thus, the degree of compensation can be freely set according to the scale of the apparatus.

Further, since the response to the test data is performed by one B channel, the response can be surely transferred, and either the bulk mode or the normal mode is used depending on the state of the line. Then, the data transfer can be executed reliably.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention for explaining transmission of test data.

FIG. 2 is a diagram illustrating a response to test data.

FIG. 3 is a diagram illustrating data transfer in a bulk mode.

FIG. 4 is a diagram illustrating a method of delay compensation.

[Explanation of symbols]

 1,9 MPU 3,7 ISDN control unit 6,10 Instruction decoder 12 ISDN network 13,14 Delay compensation circuit

Continued on the front page (72) Inventor Toshiyuki Kawato 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Hitachi, Ltd. Information and Communication Division (72) Inventor Mitsuo Yoshida 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Within Telegraph and Telephone Corporation (72) Inventor Minoru Yasuda 1-6-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Corporation (56) References JP-A-2-181530 (JP, A) JP-A Sho-61 -169044 (JP, A) JP-A-60-224361 (JP, A) JP-T-61-501543 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 29/08 H04L 12/02 H04M 11/00 303

Claims (2)

(57) [Claims] 1. An apparatus connected to an ISDN user network, comprising:
In a data transfer method for transferring data in bulk mode by simultaneously using two B channels, test data is transferred in bulk mode prior to data transfer, and if test data can be transferred correctly, is determined to be possible is the data from the bulk mode lines are transferred using, thereafter, have the line transfer of data by the bulk mode, the transfer of the test data, correct test
Line used when transfer data could not be transferred
Determines that data transfer in bulk mode is not possible,
Thereafter, the normal mode using only one B channel is used.
A data transfer method characterized by performing data transfer. 2. After the transfer of the test data in the bulk mode, the apparatus on the transmitting side and the receiving side of the test data are set to the normal mode using only one B channel, and the test is performed from the apparatus on the receiving side of the test data. The data reception result
Data transfer method according to claim 1, wherein the response by the normal mode to the transmitting device.