JPH0642692B2 - ISDN compound terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ISDN composite terminal device connected via an integrated service digital integrated network (ISDN).

(Prior Art) Recently, instead of the conventional analog communication network (public telephone line), integrated services digital network (Integrated Services Digital Network; which realizes integration of various services based on digital integration of telecommunications network). Below, IS
The service of DN) was started.

The ISDN is the International Telegraph and Telephone Advisory Committee (CCIT
T) and the Telegraph and Telephone Technical Committee (TTC), and further, T, S and R reference points are defined as user network interfaces with the composite terminal device connected to this ISDN.

At this T point and S point, the basic interface is 2B +
It is defined as D, that is, 64K as an information channel.
2 bps (B channel), 1 as control channel
There is one channel at 6 Kbps (D channel). Further, the two B channels are defined as B1 channel and B2 channel, which are independent channels.

(Problems to be Solved by the Invention) However, in the above definition, since the two B channels (B1 channel and B2 channel) are independent, when the B1 channel and the B2 channel are used simultaneously, the B1 channel and the B2 channel are There is no guarantee that it will match at the start.

Therefore, when they do not match, for example, when audio is sent in stereo, the L channel and the R channel are set to B1 and B2, respectively.
When the channel is used, there is a problem that the phase shifts.

Further, when the B1 and B2 channels are regarded as one channel and transmitted at 128 Kbps, there is a problem that the order of data is different from that transmitted.

Therefore, an object of the present invention is to provide an ISDN composite terminal device that solves the above-mentioned problems of the conventional technology.

(Means for Solving the Problems) In order to achieve the above object, the present invention is a composite terminal device connected to an integrated service digital integrated network (ISDN), wherein synchronization of data strings of B1 channel and B2 channel is performed. B channel synchronization data generation unit for generating B channel synchronization data to be transmitted, a B channel data transmission unit for transmitting B channel synchronization data generated by this B channel synchronization data generation unit, and a partner composite terminal device A B-channel data receiving unit that receives the B-channel data transmitted by the B-channel data transmission unit, a synchronization algorithm storage unit that stores a synchronization algorithm for correcting the data string so as to establish synchronization,
According to the synchronization algorithm, the B-channel data synchronization unit that corrects the data sequence of the B1 channel and the B2 channel received by the B-channel data reception unit and the synchronization of the data sequence of the B1 channel and the B2 channel are performed. I including a D channel interface section for sending information and a control section for controlling the above-mentioned sections as a whole.
The present invention provides a composite terminal device for SDN, and further is a composite terminal device connected to an integrated service digital integrated network (ISDN), and B channel verification data for verifying a data string of B1 channel and B2 channel. And a data transmitted from the B-channel verification data generating unit that generates the B-channel verification data generation unit and the B-channel data transmission unit that is sent back from the partner composite terminal device in communication on either the B1 channel or the B2 channel as it is. The B channel data receiving unit stores the correlation between the data received by the B channel data receiving unit and the B channel verification data generated by the B channel verification data generating unit, and stores the B channel based on this correlation. A transmission algorithm storage unit that stores a transmission algorithm for transmitting the data of The B-channel verification data generated by the channel verification data generation unit and the B-channel data transmission unit that transmits the B-channel data by the transmission algorithm and the reception of the B1 channel and the B2 channel to the partner composite terminal device. Provided is an ISDN composite terminal device comprising a D channel interface section for transmitting information that data is to be sent back as it is on either the B1 or B2 channel in the order in which data is received, and a control section for totally controlling each section. To do.

(Example) First, a first example of the ISDN composite terminal device according to the present invention will be described.

FIG. 1 is a diagram showing a first embodiment of an ISDN composite terminal device according to the present invention.

In the figure, the ISDN network 1 has an ISDN composite terminal 2,
3 are connected respectively, and through the ISDN network 1, ISD
Data is transmitted and received between the N composite terminal 2 and the ISDN composite terminal 3. The ISDN composite terminals 2 and 3 have the same configuration, and the ISDN composite terminal 3 is shown in detail in the figure.

The communication line from the ISDN network 1 passes through the layer 1 interface 31 and the D channel (Dch) interface 32,
B channel (Bch) data transmission unit 33, B channel (Bc)
h) Connected to the data receiving unit 34.

Further, the Bch data transmission unit 33 includes a Bch synchronization data generation unit 37.
However, a Bch data synchronization unit 35 is connected to the Bch data reception unit 34. Further, the control unit 36 and the synchronization algorithm storage unit 38 are connected to the blocks 31 to 35 and 37, respectively.

Next, each block will be described in detail.

The Bch synchronization data generator 37 generates B channel synchronization data to be transmitted in order to synchronize the data strings of the B1 channel and the B2 channel.

The Bch data transmitter 33 converts the B channel data into layer 1
While transmitting to the partner communication terminal device through the interface 31, the B channel synchronization data generated by the Bch synchronization data generation unit 37 is also transmitted to the layer 1 interface 31.
Through the other communication terminal device.

The Bch data receiving unit 34 receives the B channel data transmitted from the partner composite terminal 2 through the layer 1 interface 31.

The synchronization algorithm storage unit 38 stores a synchronization algorithm for modifying the data strings of the B1 channel and the B2 channel so that the data strings are synchronized.

The Bch data synchronization unit 35 uses the synchronization algorithm stored in the synchronization algorithm storage unit 38 to store the Bch data reception unit 34.
The data string correction is performed to synchronize the data strings of the B1 channel and the B2 channel received in.

The Dch interface 31 sends information indicating that the data strings of the B1 channel and the B2 channel are to be synchronized to the Dch interface (not shown) of the ISDN compound terminal 2 through the layer 1 interface 31.

The control unit 36 controls the blocks 31 to 35, 37 and 38 as a whole.

The operation of the above configuration will be described below.

First, from the Bch data transmission unit (not shown) of the ISDN composite terminal 2, through the ISDN network 1, the transmission data string shown in FIG.
It is transmitted to the DN composite terminal 3.

Next, the ISDN composite terminal 3 checks the order of the data strings received through the layer 1 interface 31, and synchronizes the data strings of the next B1 channel and the B2 channel with the promise exchanged with the ISDN composite terminal 2 which is opposed in advance. Modify the data string to obtain

For example, the received data string is a data string as shown in FIG. 3 (that is, the data order is guaranteed in the B1 channel independent and the B2 channel independent, but when the B1 and B2 channels are viewed as one channel, they are transmitted. In the case of a data string different from the data string), this received data string is corrected by the Bch data synchronization unit 35 to delay each data of the B2 channel by one data, and the corrected data as shown in FIG. Get the columns.

This corrected data string is the same as the transmission data string shown in FIG. 2 transmitted from the ISDN composite terminal 2.

Then, the synchronization algorithm for performing the above-mentioned data sequence correction (in this example, performing the data sequence correction for delaying each data of the B2 channel by one data) is stored in the synchronization algorithm storage unit 38, and this synchronization algorithm is stored. Using, the Bch data synchronization unit 35 synchronizes the subsequent data strings of the B1 channel and the B2 channel.

The ISDN composite terminal 3 exchanges the information for performing the above procedure (that is, the information of synchronizing the data strings of the B1 channel and the B2 channel) with the ISDN composite terminal 2 which is opposed by the Dch interface 32 in advance. I will communicate with you.

As described above, the arrangement of FIG. 1 makes it possible to synchronize the data strings of the B1 channel and the B2 channel.

Next, a second embodiment of the ISDN composite terminal device according to the present invention will be described.

FIG. 5 is a diagram showing a second embodiment of the ISDN composite terminal device according to the present invention. The same components in FIG. 1 described above are designated by the same reference numerals.

In the figure, as in FIG. 1, the ISDN network 1 has an IS
The DN composite terminals 2'3 'are connected to each other, and data is transmitted and received between the ISDN composite terminal 2'and the ISDN composite terminal 3'through the ISDN network 1. The ISDN composite terminals 2'and 3'have the same structure, and the ISDN composite terminal 3'is shown in detail in the figure.

The communication line from the ISDN network 1 is connected to the Dch interface 32, the Bch data transmitter 39, and the Bch data receiver 40 via the layer 1 interface 31.

Further, a Bch check data generator 41 is connected to the Bch data transmitter 39. Further, the control unit 36 and the transmission algorithm storage unit 42 are connected to the blocks 31, 32 and 39 to 41, respectively.

Next, each block will be described in detail.

The Bch check data generation unit 41 generates B channel check data for verifying (checking) the data strings of the B1 channel and the B2 channel.

The Bch data transmitter 39 sends the B channel data to the layer 1
While transmitting to the other communication terminal device through the interface 31, B generated by the Bch check data generating unit 41
Similarly, the channel check data is transmitted to the partner communication terminal device through the layer 1 interface 31.

The Bch data receiving unit 40 receives, via the layer 1 interface 31, the data transmitted from the Bch data transmitting unit 39 and the data sent back from the partner terminal device in communication on either the B1 or B2 channel as it is. .

The transmission algorithm storage unit 42 stores the correlation between the data received by the Bch data reception unit 40 and the B channel check data generated by the Bch check data generation unit 41, and the data of the B channel is stored based on this correlation. Store the sending algorithm for sending the.

The Bch data transmission unit 39 transmits the B channel check data generated by the Bch check data generation unit 41, and also transmits the B channel data according to the transmission algorithm stored in the transmission algorithm storage unit 42.

The Dch interface 32 responds to the partner composite terminal device through the layer 1 interface 31 with information that the received data of the B1 channel and the B2 channel are received in the order in which they are received, and that they are sent back as they are on any of the B1 or B2 channels. It is sent to the Dch interface (not shown) of the ISDN composite terminal 2 '.

The control unit 36 totally controls the blocks 31, 32, 39 to 42.

The operation of the above configuration will be described below.

First, the data string (Bch channel data) shown in FIG. 6 generated in the Bch check data generating unit 41 of the ISDN composite terminal 3'is transferred from the Bch data transmitting unit 39 through the ISDN network 1 to the relative connection. ISDN
It transmits to the compound terminal 2 '.

Next, when the ISDN composite terminal 2'receives the B channel reception data string shown in FIG.
Due to the promise to be exchanged with the N compound terminal 3 ',
The data string shown in the figure is sent back to the ISDN composite terminal 3'on the B1 channel. (In this case, the B2 channel may be sent back.) The ISDN composite terminal 3'passes the B1 channel data string (data string shown in FIG. 8) through the layer 1 interface 31 and the Bch data receiving section 40. Receive on the B1 channel.

Since the data order of the B1 channel and the B2 channel is guaranteed independently of each other, the control unit 36 uses the data sequence shown in FIG. 8 (the data sequence returned from the ISDN composite terminal 2) as a basis. ISDN compound terminal 2 is the 9th
B1 channel as shown is 1 for B2 channel
It can be estimated that the B channel data string delayed by the frame is received.

As a result, the ISDN composite terminal 3'has a Bch data transmission unit.
From 39, the ISDN composite terminal 2'has the 11th by transmitting the B channel data string in which the B1 channel leads the B2 channel by one frame as shown in FIG.
The B channel data string shown in the figure can be received.

Then, the B1 channel is set to 1 with respect to the B2 channel.
A transmission algorithm for advancing a frame and transmitting a B channel data string is stored in the transmission algorithm storage unit 42, and based on this transmission algorithm, the Bch data transmission unit 39 transmits the subsequent B1 and B2 channel data. .

The ISDN composite terminal 3'exchanges information for performing the above procedure with the ISDN composite terminal 2'which faces the Dch interface 32 in advance.

As described above, with the configuration shown in FIG. 5, the data strings of the B1 channel and the B2 channel can be synchronized.

(Effects of the Invention) As described above, according to the ISDN composite terminal device of the present invention, the data strings of the B1 channel and the B2 channel can be synchronized, and as a result, the following various features are provided.

When sending audio in stereo, the phases of the L and R channels can be synchronized.

When audio and video are sent to the B1 and B2 channels respectively, audio and video can be synchronized.

The B1 and B2 channels can be viewed as one 128 Kbps channel, which enables high-speed data transfer.

[Brief description of drawings]

FIGS. 1 and 5 are diagrams showing respective embodiments of the ISDN composite terminal device according to the present invention, FIG. 2 is a diagram showing an example of a data string transmitted in FIG. 1, and FIG. 3 is FIG. FIG. 4 is a diagram showing an example of a data sequence received by the communication system, FIG. 4 is a diagram showing a modified data sequence of FIG. 3, FIG. 6 is a diagram showing an example of the data sequence transmitted in FIG. 5, and FIG. FIG. 8 is a diagram showing an example of a data stream received by the ISDN composite terminal 2, FIG. 8 is a diagram showing a data stream received by the ISDN composite terminal 3 of FIG. 5, and FIG. 9 is data delayed by one frame on the B1 channel. FIG. 10 is a diagram showing a sequence, FIG. 10 is a diagram showing a data sequence of one frame progress of the B1 channel, and FIG. 11 is a diagram showing a B channel data sequence. 1 ... ISDN network, 2, 2 ', 3, 3' ... ISDN compound terminal, 31 ... Layer 1 interface, 32 ... Dch interface, 33, 39 ... Bch data transmitting section, 34, 40 ... Bch data receiving section, 35 ... Bch data synchronization unit, 36 ... Control unit, 37 ... Bch synchronization data generation unit, 38 ... Synchronization algorithm storage unit, 41 ... Bch check data generation unit, 42 ... Transmission algorithm storage unit.

Claims (2)

[Claims] 1. Integrated services digital integrated network (ISDN)
A B-channel synchronization data generating unit for generating B-channel synchronization data to be transmitted for synchronizing data strings of B1 channel and B2 channel, and a B-channel synchronization data generating unit. A B-channel data transmission unit that transmits the generated B-channel synchronization data, a B-channel data reception unit that receives the B-channel data transmitted from the partner composite terminal device, and a synchronization for correcting the data string so as to establish synchronization. A synchronization algorithm storage unit for storing an algorithm; a B channel data synchronization unit for correcting a data sequence of the B1 channel and B2 channel data sequences received by the B channel data reception unit by the synchronization algorithm; and a B1 channel And the D channel I that sends the information that the B2 channel data sequence is synchronized. ISDN consisting the interface unit, a control unit for generally controlling the respective units
Composite terminal equipment. 2. Integrated Services Digital Integrated Network (ISDN)
And a data transmitted from the B channel data transmission unit, which is a composite terminal device connected to the B channel data and a B channel verification data generating unit for generating B channel verification data for verifying the data strings of the B1 channel and the B2 channel. To
A B-channel data receiving unit for receiving data sent back as it is from either the B1 or B2 channel from the partner composite terminal device in communication, and the data received by this B-channel data receiving unit and the B
A transmission algorithm storage unit that stores a correlation with the B channel verification data generated by the channel verification data generation unit and stores a transmission algorithm for transmitting B channel data based on this correlation; A B-channel data transmission unit that transmits the B-channel verification data generated by the channel-verification data generation unit and also transmits the B-channel data by the transmission algorithm, and the reception of the B1 channel and the B2 channel to the partner composite terminal device. In the order in which the data was received, and B1 or B
An ISDN including a D channel interface section that sends information that it can be sent back as it is on one of two channels, and a control section that totally controls each section.
Composite terminal equipment.