JPH04120832A - Transfer system for subscriber's private data - Google Patents

Abstract

PURPOSE:To attain the effective use of a common B channel at plural terminals by setting a local protocol between a terminal equipment and a network terminating equipment and using exclusively the B channel only when the data are transferred to the B channel CONSTITUTION:The terminal equipments 51-5i of a network terminating equipment 1 are provided with the local protocol function parts 61-6i in addition to the protocols arranged to a communication network. Then a local protocol is set between the equipment 1 and the equipments 51-5i. A B channel is exclusively used only when the data are sent onto the B channel. In such a constitution, plural terminal equipments are successively selected one by one and the B channel is effectively used.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an in-home data transfer system, and in particular, a method for connecting a plurality of terminal devices through a single transmission path and connecting them to a communication network via a network termination device. Also, on the above transmission path, CCITT Recommendation I.
This invention relates to an in-home data transfer system that has two B channels and one D channel according to the basic interface of 430, and uses one of the two B channels to perform a packet data transfer service. be.

[Conventional technology]

Conventionally, in this type of in-home data transfer system, when starting to use the B channel for data transfer, one terminal device exchanges information with the communication network on the D channel and detects that the B channel is free. sends and receives information again to the communication network on the D channel and notifies the end of the communication.
And until the B channel is released, only one terminal device monopolizes the B channel.

[Problem to be solved by the invention]

In the conventional in-home data transfer method described above, when using the B channel for packet data transfer service, information is exchanged between the terminal device and the communication network over the D channel in advance, and the availability of the B channel is detected. Since the B channel is configured so that one terminal device exclusively uses the B channel until the end of communication is notified to the communication network, if one terminal device monopolizes the B channel, its usage will be limited. Even when data is transferred discretely, there is a problem in that other terminal devices cannot use the vacant portion of the B channel.

[Means to solve the problem]

The in-home data transfer system of the present invention connects a plurality of terminal devices through one transmission path and connects them to a communication network via a network termination device, and also complies with CCI TT Recommendation I. 430
In an in-home data transfer system that has two B channels and one D channel according to the basic interface of data that follows the local protocol set between the terminal device and the network terminating device, in addition to the protocol determined between the terminal device and the communication network, to the D channel transmitter from the plurality of terminal devices in the network to the communication network. When receiving the data, there is a D-channel transmission control unit that stores the data and sends out an idle pattern in place of the data on the communication network side, and a local protocol using the data stored in this D-channel transmission control unit. a local protocol processing unit that creates and holds response data in accordance with the response data; and a D channel receiving unit that detects an empty KD channel from the communication network in the network termination device to a plurality of terminal devices, and determines the length of this empty space as the response data. A D channel reception control unit is provided that inserts and transmits the response data in the empty portion when the data is longer than the length of the data, and the terminal device is provided with a D channel reception control section that inserts and sends the response data in the empty portion, and the terminal device is provided with a It has a local protocol function section based on the above-mentioned local protocol.

[Effect]

In the present invention, a local protocol is set between a terminal device and a network terminating device, and the IBB channel is controlled exclusively when data is transferred on the B channel.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, 1 is a network termination device.

2 is a D-channel transmitter from a plurality of terminal devices in this network termination device 1 to the communication network, in addition to the protocol determined between the terminal devices and the communication network, the terminal device and the network termination device 1
3 is a D channel transmission control unit that stores data when it receives data according to the local protocol set between the communication network and sends an idle pattern to the data receiver on the communication network side. A local protocol processing unit that creates and holds response data in accordance with the υ local protocol using data accumulated in the transmission control unit 2; 4 is a D channel reception unit for multiple terminal devices from the communication network in the network termination device 1; There is a D channel reception control section that detects an empty D channel, and when the length of this empty area is longer than the length of the response data, inserts and sends response data into the empty area, and these are accommodated in the network terminal device 1. has been done.

51 to 51 are terminal devices in the network terminal device 1, and these terminal devices 51 to 51 have local protocol function units 61 to 61 based on local protocol in addition to the protocol determined between the terminal device and the communication network. have.

7 is local protocol reception data sent from the D channel transmission control unit 2 to the local protocol processing unit 3; 8 is local protocol transmission data sent from the local protocol processing unit 3 to the D channel reception control unit 4; 9,10°11,12 HD channel data.

13 is a transmission line, 14 is a subscriber line, 15 is a transmission line, 16
is the receiving channel.

Figure 2 is a flowchart for explaining the operation of Figure 1.
2 is a flowchart showing an example of the local protocol function section 5 shown in FIG. 1. FIG. In each step 101, 102, . . . , 105 in FIG. 2, a predetermined process is executed.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, a network termination device 1 that terminates a subscriber line 14 of a communication network and serves as an entrance/exit of an in-home system connects a plurality of terminal devices 51 to 51 via one transmission path 13. The network terminal device 1 has a D channel transmission control section 2, a local protocol processing section 3, and a D channel reception control section 4, and the terminal devices 51 to 5i each have a local D channel transmission control section 2, a local protocol processing section 3, and a D channel reception control section 4. It has protocol function units 61-61.

Then, the D channel data 9 sent from the terminal device 5 through the transmission path 15 is sent to the D channel transmission control section 2 as local protocol reception data 11, for example, nEQ(j
) is inserted with an idle pattern and sent to the communication network as D channel data 10. local·
The protocol reception data 7 includes identification information of the terminal device 5 and identification information of which of the two B channels is desired to be used, and the local protocol processing unit 3 that received the local protocol reception data 7 retains the identification information. Depending on the availability status of the B channel, the identification information of the terminal device 5 and
Local protocol transmission data 8 including identification information as to whether the B channel can be used is sent to the D channel reception control section 4.

On the other hand, when the D channel reception control unit 4 finds an empty space long enough to insert the local protocol transmission data 8 into the D channel data 12 received from the communication network, the D channel reception control unit 4 inserts the local protocol transmission data 8 into the empty part. is inserted and sent to the receiving channel IHC as D channel data 12.

Next, the procedure of the in-house data transfer system of the present invention will be explained with reference to FIG. 2, which is a flowchart showing an example of the functions of the local protocol function section.

First, when the terminal device 5 (terminal device (j)) transmits packet data Dj through the B channel, the local protocol function section 6 accumulates the transmission data Di (
Step 101). Then, the local protocol function unit 6 that has accumulated the data sends a B channel use request including identification information of the terminal device 5 and designation information for one of the two B channels to the D channel (step 1
02). Next, the local protocol function unit 6 that sent the B channel use request receives the local protocol transmission data sent from the network terminal device 1 and learns whether the B channel can be used (step 103). Here, if the B channel is not used, the process of step 102 is repeated. Then, the local protocol function unit 6, which has received the B channel usage permission, sends the accumulated transmission data to the B channel (step 104), sends the B channel usage end to the D channel (step 105), and ends the process.

The competition between the B channel use requests from each terminal device 5 is based on the normal CCITT recommendation (2), since the B channel use requests are made using the D channel.

The D-channel contention control within the basic interface of A.430 can be arbitrated.

Therefore, in this embodiment, by sequentially requesting the use of the B channel using the D channel immediately before transferring packet data, one of the plurality of terminal devices is sequentially selected and the B channel is requested. can be used effectively.

〔Effect of the invention〕

As explained above, the present invention sets a local protocol between the terminal device and the network termination device, and controls the B channel to be dedicated only when transferring data to the B channel. This has the effect that the common B channel can be used effectively in the terminals.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of FIG. 1...Network terminal device, 2...D channel transmission control unit, 3...Local e protocol processing unit, 4...
... D channel reception control section, 5□ ~51 ... terminal device, 61 - 61 ... 90-Cal protocol function section, 13 ... transmission path, 15 ... transmission path, 16.
... Receiving channel.

Claims (1)

[Claims] A plurality of terminal devices are coupled through one transmission path and connected to a communication network via a network termination device, and a CCI is connected on the transmission path.
TT Recommendation I. In an in-home data transfer system that has two B channels and one D channel according to the basic interface of 430, and uses one of the two B channels to execute a packet data transfer service, the network In addition to the protocol determined between the terminal devices and the communication network, the D channel transmitting unit from the plurality of terminal devices in the terminal device to the communication network uses the local protocol set between the terminal device and the network termination device. When receiving data according to the data, the data is stored and an idle pattern is sent to the communication network instead of the data.
A channel transmission control unit, a local protocol processing unit that creates and holds response data according to a local protocol using data accumulated in the D channel transmission control unit, and a plurality of terminal devices from the communication network in the network termination device. A D channel reception control unit is provided in the D channel reception unit heading toward the destination, and detects an empty D channel, and when the length of the empty space is longer than the length of the response data, inserts the response data into the empty portion and transmits it. , and the terminal device has a local protocol function unit according to the local protocol in addition to the protocol determined between the terminal device and the communication network.