JPH0454046A - Isdn communication controller - Google Patents

Abstract

PURPOSE:To adopt an optimum data transmission procedure in response to a kind of data to be transferred by providing both a means for high reliability transfer and a means for data stream transfer and selecting and executing either of the transmission means according to the kind of a medium of a received data. CONSTITUTION:A system bus transfer processing control section 6 discriminates a data type stored in a system bus memory 5 to decide whether a high reliability transfer procedure is to be used or a data stream transfer procedure is to be used. A voice data is transferred to an opposite information processing system by the data stream transfer procedure. A still picture data is transferred to the opposite information processing system by the high reliability transfer procedure. An ISD network transfer processing control section 14 references a transfer procedure of a table, recognizes the transfer procedure used in a relevant channel and requests the transfer to an idle buffer in two plane page buffers #1(22) and #2(23) with a reception arbitration circuit.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to data communication, and in particular,
The present invention relates to an ISDN communication control device used when communicating multimedia data between information processing systems using SDN'lI4.

[Conventional technology]

Such an ISDN communication control device is used by being attached to each information processing system and interposed between each information processing system and IsDNm when communicating multimedia data between the information processing systems via ISDNM. However, conventional ISDN communication control equipment either has the function of a highly reliable transfer device that does not cause data transfer errors between information processing systems, or has a function that prevents data transfer delays between information processing systems. Either it had the function of a data stream transfer device, or it had the function of a data stream transfer device.

Here, a highly reliable transfer device is a first device that, when receiving data from the information processing system to which it belongs, divides the received data into appropriate sizes and generates frames with error control codes. means, a second means for adding a number indicating the order to each generated frame and transmitting it, and when the frame is received from an ISDN network, an individual frame number of the frame and error control in each frame. a third means for checking the code; and a third means for checking the code;
a fourth means for issuing an acknowledgment, a retransmission request, and a temporary transmission suspension request; and a fifth means for reproducing data, and has a high multiplicity transfer function without causing data transfer errors between information processing systems.

Furthermore, when a data stream transfer device receives data from the information processing system to which it belongs,
A page buffer for transmitting the received data to the ISDN network, and a page buffer for transmitting the received data to the information processing system to which it belongs when data is received from the ISDN network, to the ISDN communication control device. It is equipped with twice the number of information channels of the ISDN line to be accommodated, and when communicating using one information channel,
Of the two page buffers provided for the channel, one side is used for transmission and reception with the information processing system, and at the same time, the other side is used for transmission and reception with the ISDN network, and these are alternately used. It has a data stream transfer function that prevents data transfer delays between information processing systems.

[Problem to be solved by the invention]

Audio that is required to be transferred between information processing systems.

Depending on the media type of each data, multimedia data consisting of images, pointing information, synchronization information, etc. may be divided into data that does not tolerate data transfer errors (for example, data for performing synchronization control between multiple data), and Data is broadly classified into two types: data that does not tolerate data transfer delays (for example, audio data, etc.).

Conventional ISDN communication control devices have only either a high-fidelity transfer function or a data stream transfer function. Therefore, when transferring multimedia data between information processing systems connected to conventional ISDN communication control devices, only high-reliability transfer or data stream transfer can be performed; A problem arises in that it is not possible to perform data transfer.

An object of the present invention is to solve the problems of the prior art and to provide an ISD that can perform optimal data transfer depending on the media type of data to be transferred between information processing systems.
An object of the present invention is to provide an N communication control device.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an ISDN communication control device that includes a first table that stores correspondence relationships among highly reliable transfer devices, data stream transfer devices, data media types, and corresponding transfer devices. and I.S.D.
The second section contains management information indicating whether the information channel composing the N line is used by a highly reliable transfer device or a data stream transfer device.
table, and a transfer processing control unit.

[Effect]

When the transfer processing control unit receives data from the information processing system to which the ISDN communication control device belongs,
After determining the media type of the data, the data is then transferred to the ISDN by referring to the first table.
Determine the transfer device to be used to send to the ISD
When data is received from the N network, after determining the reception information channel of the data, the data is then sent to the information processing system to which it belongs by referring to the second table. Determine the transfer device to be used.

〔Example〕

FIG. 1 is a block diagram showing a case where an rsDN communication control device as an embodiment of the present invention is connected to an information processing system and data communication is performed with the partner information processing system via an ISDN network.

In the figure, reference numeral 1 denotes an information processing system, which is connected to an ISDN communication control device 3 using a system bus 2 . The ISDN communication control device 3 includes a system bus transfer circuit 4, a system bus memory 5, a system bus transfer processing control section 6, a CPU bus 7, a high-speed transfer function section 8, a data stream transfer function section 9, 10 buses 10, D channel memory 11, B1 channel memory 12, B2 channel memory 13, ISDN network transfer processing control unit 14, ISD
It is composed of an N network transfer circuit 15.

The high reliability transfer function section 8 includes a CPU bus buffer 16, a high reliability transfer processing memory 17, a high reliability transfer processing circuit 18,
It is composed of an IO bus buffer 19. The data stream transfer function 9 includes a two-sided page buffer #1 with a transmission arbitration circuit (page #1, page #2) 20, a two-sided page buffer #2 with a transmission arbitration circuit (page #1, page #2) 21 , two-sided page buffer with reception arbitration circuit #1 (page #1. page #2) 22, two-sided page buffer with reception arbitration circuit #2 (page #l.

Page #2) consists of 23 pages.

This ISDN communication control device 3 and the partner information processing system 24 with ISDN communication control device are connected via an ISDN network 25.

In the example of data communication between the information processing systems in Figure 1, Figure 2 shows whether to use the high reliability transfer procedure or the data stream transfer procedure when transmitting the data, depending on the media type of the data. This is a table that is referred to when determining whether the system bus transfer processing controller 6 in FIG.
has.

FIG. 3 shows the usage status of each information channel constituting the ISDN circuit and the transfer procedure of each information channel in the example of data communication between the information processing systems shown in FIG.
A table that manages whether the high-fidelity transfer procedure or the data stream transfer procedure is used.
The ISDN II transfer processing control unit 14 shown in FIG. 1 has this.

Next, the present invention will be explained in detail.

First, a case in which audio data is transmitted from the information processing system 1 will be described.

Audio data sent from the information processing system 1 via the system bus 2 is temporarily transferred to the system bus memory 5 using the system bus transfer circuit 4. The system bus transfer processing control unit 6 determines the type of data stored in the system bus memory 5, and uses the table shown in FIG.
It is decided to use the data stream transfer procedure to transmit the data, and a transfer request is made to the free one of the two-sided page buffer with transmission arbitration circuit #1 (20) or #2 (21) (here Now let's call it #1 (20)).

The arbitration circuit of the two-sided page buffer with transmission arbitration circuit #1 (20) indicates that the empty page buffer #1 or #2 is used (in this case, it is designated as #l), the system bus memory Data is transferred from page buffer #1 to page buffer #1. The arbitration circuit of the two-sided page buffer #1 (20) with a transmission arbitration circuit monitors whether page buffer #1 becomes full, and when it becomes full, the page buffer #2 is sent to the system bus transfer processing control unit 6. , and at the same time requests the ISDN network transfer processing control unit 14 to read it.

The ISDNli1 transfer processing control unit 14 determines the channel to which the data read from the page buffer #l should be sent based on the usage status of the table shown in FIG.
At the same time, if the channel was previously free or used in a high-fidelity transfer procedure, enter in the table in Figure 3 that the channel will be used in a data stream transfer procedure. I'll keep it.

Then, if the channel is vacant, the ISDN network transfer processing control unit 14 transfers the call connection message to the D channel memory 11, and then the ISDN network transfer circuit 15 transfers the call connection message to the D channel memory 11.
using the D channel of the ISDN network 25 to send it to the other party's information processing system with an ISDN communication control device.

Then, if the channel is free or the high-reliability transfer procedure is changed to the data stream transfer procedure,
A message notifying that the channel will be used in the data stream transfer procedure is transferred to the D channel memory 11, and then the ISDNy1 transfer circuit 15 is used to transfer the message to the ISDNy1 transfer circuit 15.
It is sent to the other party's information processing system 24 with an ISDN communication control device through the D channel of the DN network 25.

Thereafter, the ISDNm transfer processing control unit 14 transfers the data read from the page buffer #1 to the determined B1 channel memory 12. The ISDN network transfer circuit 15 is
Take out the data from the B1 channel memory 12 and
The data is transmitted to the other party's information processing system 24 with ISDN communication control device via the DN'fI 425.

As described above, the audio data is transferred to the other party's information processing system using the data stream transfer procedure.

Next, a case in which still image data is transmitted from the information processing system 1 will be described.

As in the case of transmitting audio data, the system bus transfer processing control unit 6 determines the type of data stored in the system bus memory 5, and uses the table shown in FIG. Deciding to use the track transfer procedure,
Send data to the CPU bus buffer 16.

The high-fidelity chain transfer processing circuit 18 includes a CPU bus buffer 16
The data sent to
Byte or less), an error control code is added to it to form a frame, and a frame number is added to each frame. Then, the high-fidelity transfer processing circuit 18 transfers the framed data! 0 bus buffer 19, I
requesting the sDNM A transfer processing control unit 14 to read;
At the same time, b'l tv is received from the other party's information processing system.
, or until a retransmission request message is sent, the framed data is stored in the high-reliability light transfer processing memory 1.
Keep it at 7.

Then, when a reception confirmation message is sent from the other party's information processing system, the data is discarded, and when a retransmission request message is sent, the data is sent to the 10 buffer 19 again. Also, if you receive a message requesting a temporary suspension of transmission,! Sending data to the 0 bus buffer 19 is temporarily suspended.

After that, in the same way as transmitting audio data, determine the channel to which the framed data should be sent, and first, if the channel is empty, use the D channel to transmit the framed data to the other party's information processing system 2.
4, and then, if the transfer procedure of the channel is changed, send a message to the other party's information processing system 24 using the D channel notifying that the high transfer procedure will be used; After that, using the memory for the channel and the ISDN network transfer circuit 15, the ISDN network 25
The framed data is transmitted to the other party's information processing system 24 with ISDN communication control device via.

As described above, the still image data is transferred to the other party's information processing system using the high confidence transfer procedure.

Next, a case will be described in which video data is received from the partner information processing system 24 with an ISDN communication control device via the ISDN network 25.

Prior to data reception, a message is sent on the D channel to notify whether the channel for receiving data is used in the high-fidelity transfer procedure or in the data stream transfer procedure, and the ISDN1 transfer circuit 15 sends a message to the D channel. received, D
It is stored in the channel memory 11. The rsDN network transfer processing control unit 14 extracts the message and enters the transfer procedure used by the channel that receives the data in the transfer procedure in the table of FIG. 3 (here, data stream transfer procedure). The ISDN network transfer circuit 15 stores the received data in a channel memory (here, B1 channel memory 12) corresponding to the channel on which the data was received.

The ISDNw4 transfer processing control unit 14 refers to the transfer procedure in the table in FIG. 3, learns the transfer procedure used in the channel (here, the data stream transfer procedure), and
Two-sided page buffer with reception arbitration circuit #1 (22)
Alternatively, request transfer to the vacant one of #2 (23) (here, #1 (22)). Dual-sided page buffer with reception arbitration circuit #1 (22) indicates that the arbitration circuit uses the empty page buffer #l or #2 (here, #1 is used), B1 channel memory Data is transferred from page buffer #1 to page buffer #l.

The arbitration circuit of the two-sided page buffer with reception arbitration circuit #1 (22) monitors whether the page buffer #l becomes full, and when it becomes full, the ISDN network transfer processing control unit 14
to use page buffer #2, and at the same time requests the system bus transfer processing control unit 6 to read. The system bus transfer processing control unit 6 is a page buffer #1
The data read from the system bus memory 5 is sent to the system bus transfer circuit 4 through the system bus memory 5. The system bus transfer circuit 4 transfers the received data to the information processing system 1 using the system bus 2.

As described above, video data is transferred from the other party's information processing system using the data stream transfer procedure.

Finally, a case will be described in which synchronization information data is received from the partner information processing system 24 with ISDN communication control device via the ISDN network 25.

As in the case of receiving video data, the ISDN network transfer processing control unit 14 refers to the transfer procedure in the table in FIG. (transfer procedure), IO from Bl channel memory 12 or B2 channel memory 13
Transfer the data to the bus buffer 19.

The high-signal transfer processing circuit 18 stores the data sent to the 10-bus buffer 19 in the high-signal transfer processing memory 17, and first, the frame numbers added to the sent data are arranged in order. It also checks the error control code within each frame. If an error is found in the frame number or the error control code in the frame, the received data is discarded, a retransmission request message is created, and the message is sent to the 0 bus buffer 19. High-fidelity transfer procedure is used to transmit the information to the other party's information processing system 24 with ISDN communication control device.

If no errors are found in the frame number or the error control code within the frame, a receipt confirmation message is created and sent to
The information is transmitted to the other party's information processing system 24 with an SDN communication control device.

If you wish to temporarily suspend data reception for some reason, create a temporary transmission suspension request message and send it to the other party's information processing system 24 with ISDN communication control device using the high-reliability transfer procedure in the same way as a retransmission message. I'll do what I do.

The high-reliability transfer processing circuit 18 then combines the normally received data and sends it to the CPU bus buffer 16. The system bus transfer processing control unit 6 sends the data read from the CPU bus buffer 16 to the system bus transfer circuit 4 via the system bus memory 5. The system bus transfer circuit 4 transfers the received data to the information processing system 1 using the system bus 2.

As described above, the synchronization information data is transferred from the other party's information processing system using the high reliability transfer procedure.

〔Effect of the invention〕

As described above, according to the present invention, the ISDN communication control device includes both means for high-fidelity transfer and means for data stream transfer, and a medium for data received from an information processing system. Select one of the transfer procedures according to the type.

Therefore, in data transfer between information processing systems, it becomes possible to adopt an optimal data transfer procedure according to the type of data to be transferred.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a case where an ISDN communication control device as an embodiment of the present invention is connected to an information processing system and data communication is performed with the other party's information processing system via the ISDN network, and FIG. An explanatory diagram showing a reference table for determining a transfer procedure from the media type of data when performing data communication between the information processing systems in Figure 1. FIG. 2 is an explanatory diagram showing a management table that manages the usage status of each information channel and the transfer procedure in use. Explanation of symbols 1... TLL processing system, 2... System bus,
3... ISDN communication control device, 4... System bus transfer circuit, 5... Memory for system bus, 6... System bus transfer processing control unit, 7... CPU bus, 8...
...High reliability transfer function unit, 9...Data stream transfer function unit, 10...10 bus, 11...D channel memory, 12...Bl channel memory, 13...
B2 channel memory, 14... ISDNwA transfer processing control unit, 15... ISDN network transfer circuit, 16...
CPU bus buffer, 17...Memory for high-fidelity transfer processing, 18...High-fidelity whale transfer processing circuit, 19...IO
Babas buffer, 20... Two-sided page buffer with transmission arbitration circuit #l (page #1. page #2), 21
... Two-sided page buffer #2 with arbitration circuit for transmission (page #1. Page #2), 22... Two-sided page buffer #1 with arbitration circuit for reception (page #1. Page #2)
), 23...Two-sided page buffer with reception arbitration circuit #2 (Page #1. Page #2) Tomi 2 Figure Agent Patent Attorney Akio Namiki 1!3 Figure

Claims (1)

[Claims] 1) When communicating multimedia data between information processing systems via an ISDN network, the system is attached to each information processing system in a form that is interposed between each information processing system and the ISDN network. In an ISDN communication control device used in an ISDN communication control device, when receiving data from an information processing system to which the device belongs, first means divides the received data into appropriate sizes to generate frames with error control codes; A second means for adding a number indicating the order to each generated frame and transmitting the same, and when a frame is received from an ISDN network, checking the individual frame number of the frame and the error control code in each frame. a fourth means for issuing a reception confirmation, a retransmission request, or a temporary transmission suspension request based on the inspection result; a fifth means for reproducing the original data by combining consecutively numbered frames; and when receiving data from an information processing system to which it belongs, An ISDN line in which a page buffer for transmitting to an ISDN network and a page buffer for transmitting the received data to an information processing system to which it belongs when data is received from the ISDN network are accommodated in the ISDN communication control device. When communicating on one information channel, one side of the two page buffers provided for that channel is used for sending and receiving information from the information processing system, and at the same time a data stream transfer device whose one side is used for transmission and reception with an ISDN network and which is alternately used; a first table that stores correspondence between data media types and corresponding transfer devices; A second table containing management information indicating whether the information channel configuring the ISDN line is used by a highly reliable transfer device or a data stream transfer device, and the information processing to which it belongs. When data is received from the system, after determining the media type of the data, by referring to the first table, determining a transfer device to be used to transmit the data to the ISDN network; When receiving data from the ISDN network,
After determining the reception information channel of the data, the transfer processing control unit determines a transfer device to be used to send the data to the information processing system to which the unit belongs by referring to the second table. An ISDN communication control device comprising: